INFO: rcu detected stall in sys_epoll_wait (7)

Status: auto-obsoleted due to no activity on 2025/01/24 21:05
Subsystems: fs
[Documentation on labels]
First crash: 656d, last: 648d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_epoll_wait (6) ext4 1 3 761d 776d 0/29 auto-obsoleted due to no activity on 2024/10/03 13:07
upstream INFO: rcu detected stall in sys_epoll_wait (2) kernel 1 15 2401d 2402d 0/29 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_epoll_wait (8) kernel 1 1 222d 222d 0/29 auto-obsoleted due to no activity on 2026/03/26 09:15
upstream INFO: rcu detected stall in sys_epoll_wait mm cgroups 1 148 2436d 2438d 0/29 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_epoll_wait (9) prio:high mm usb input 1 syz, C error error 1 39d 37d 0/29 upstream: reported C repro on 2026/06/29 21:10
upstream INFO: rcu detected stall in sys_epoll_wait (3) kernel 1 1 2401d 2401d 0/29 closed as invalid on 2020/01/08 05:33
upstream INFO: rcu detected stall in sys_epoll_wait (4) kernel 1 21 2401d 2401d 0/29 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_epoll_wait (5) usb fs input 1 syz error 2 1382d 1900d 0/29 closed as dup on 2021/05/25 09:57

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
 0-...D } 2657 jiffies s: 93801 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):

Sending NMI from CPU 1 to CPUs 0:
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fef270
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 26118 Comm: udevd Not tainted 6.12.0-rc4-syzkaller-00052-gc6d9e43954bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:413
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 cc cc cc cc e8 31 f0 0d ff eb a0 e8 ba f0 0d
RSP: 0018:ffffc90000006ef0 EFLAGS: 00000002
RAX: 0000000000000020 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82a08975 RDI: ffffffff93637660
RBP: ffffffff93637620 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000020 R14: ffffffff82a08910 R15: 0000000000000000
FS:  00007fe2de2cac80(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec0e8c7a8 CR3: 0000000117a10000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:142 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3322 [inline]
 serial8250_console_write+0xf9e/0x17c0 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:3092 [inline]
 console_flush_all+0x800/0xc60 kernel/printk/printk.c:3180
 __console_flush_and_unlock kernel/printk/printk.c:3239 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3279
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2407
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:68
 _printk+0xc8/0x100 kernel/printk/printk.c:2432
 __show_regs+0x2d3/0x750 arch/x86/kernel/process_64.c:91
 show_trace_log_lvl+0x26c/0x3d0 arch/x86/kernel/dumpstack.c:301
 sched_show_task kernel/sched/core.c:7604 [inline]
 sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7579
 show_state_filter+0xee/0x320 kernel/sched/core.c:7649
 k_spec drivers/tty/vt/keyboard.c:667 [inline]
 k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
 kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
 kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1541
 input_handler_events_default+0x116/0x1b0 drivers/input/input.c:2549
 input_pass_values+0x777/0x8e0 drivers/input/input.c:126
 input_event_dispose drivers/input/input.c:352 [inline]
 input_handle_event+0xb30/0x14d0 drivers/input/input.c:369
 input_event drivers/input/input.c:398 [inline]
 input_event+0x83/0xa0 drivers/input/input.c:390
 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1719
 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540
 hid_input_array_field+0x535/0x710 drivers/hid/hid-core.c:1652
 hid_process_report drivers/hid/hid-core.c:1694 [inline]
 hid_report_raw_event+0xa02/0x11c0 drivers/hid/hid-core.c:2040
 __hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2110
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:285
 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x17f0/0x3930 drivers/usb/gadget/udc/dummy_hcd.c:1993
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772
 handle_softirqs+0x206/0x8d0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xac/0x110 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x1e5/0xa40 kernel/sched/core.c:5202
Code: 0f 85 ad 07 00 00 8b 0d 81 e1 2d 09 85 c9 0f 85 cb 02 00 00 48 89 df e8 a9 59 c8 05 e8 f4 19 35 00 fb 65 48 8b 1d 2b 48 db 7e <48> 8d bb 30 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900035f79a8 EFLAGS: 00000206
RAX: 000000000055be81 RBX: ffff8881121b9d40 RCX: 1ffffffff14ac291
RDX: 0000000000000000 RSI: ffffffff8727f220 RDI: ffffffff8746ebc0
RBP: ffffc900035f79f0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8a564d8f R11: 0000000000000000 R12: ffff8881f583d6d8
R13: ffff888117320000 R14: 0000000000000000 R15: ffff8881f583d6d8
 context_switch kernel/sched/core.c:5331 [inline]
 __schedule+0x1067/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb85fe2ee0 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fdc970
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
 </TASK>
task:udevd           state:S stack:27856 pid:26096 tgid:26096 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb8605c170 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fdaf30
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:udevd           state:S
 stack:26016 pid:26107 tgid:26107 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb85fedf40 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fb48a0
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:udevd           state:R  running task     stack:23712 pid:26118 tgid:26118 ppid:2861   flags:0x0000400a
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:7604 [inline]
 sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7579
 show_state_filter+0xee/0x320 kernel/sched/core.c:7649
 k_spec drivers/tty/vt/keyboard.c:667 [inline]
 k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
 kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
 kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1541
 input_handler_events_default+0x116/0x1b0 drivers/input/input.c:2549
 input_pass_values+0x777/0x8e0 drivers/input/input.c:126
 input_event_dispose drivers/input/input.c:352 [inline]
 input_handle_event+0xb30/0x14d0 drivers/input/input.c:369
 input_event drivers/input/input.c:398 [inline]
 input_event+0x83/0xa0 drivers/input/input.c:390
 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1719
 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540
 hid_input_array_field+0x535/0x710 drivers/hid/hid-core.c:1652
 hid_process_report drivers/hid/hid-core.c:1694 [inline]
 hid_report_raw_event+0xa02/0x11c0 drivers/hid/hid-core.c:2040
 __hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2110
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:285
 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x17f0/0x3930 drivers/usb/gadget/udc/dummy_hcd.c:1993
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772
 handle_softirqs+0x206/0x8d0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xac/0x110 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x1e5/0xa40 kernel/sched/core.c:5202
Code: 0f 85 ad 07 00 00 8b 0d 81 e1 2d 09 85 c9 0f 85 cb 02 00 00 48 89 df e8 a9 59 c8 05 e8 f4 19 35 00 fb 65 48 8b 1d 2b 48 db 7e <48> 8d bb 30 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900035f79a8 EFLAGS: 00000206
RAX: 000000000055be81 RBX: ffff8881121b9d40 RCX: 1ffffffff14ac291
RDX: 0000000000000000 RSI: ffffffff8727f220 RDI: ffffffff8746ebc0
RBP: ffffc900035f79f0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8a564d8f R11: 0000000000000000 R12: ffff8881f583d6d8
R13: ffff888117320000 R14: 0000000000000000 R15: ffff8881f583d6d8
 context_switch kernel/sched/core.c:5331 [inline]
 __schedule+0x1067/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb85fe2ee0 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fdc970
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:udevd           state:S
 stack:26800 pid:26156 tgid:26156 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246
 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb85fe6670 R08: 0000000000000004 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fd7a90
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:udevd           state:D
 stack:24064 pid:26206 tgid:26206 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 evdev_detach_client drivers/input/evdev.c:377 [inline]
 evdev_release+0x23f/0x400 drivers/input/evdev.c:440
 __fput+0x3f6/0xb60 fs/file_table.c:431
 __fput_sync+0x45/0x50 fs/file_table.c:516
 __do_sys_close fs/open.c:1565 [inline]
 __se_sys_close fs/open.c:1550 [inline]
 __x64_sys_close+0x86/0x100 fs/open.c:1550
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de3f60a8
RSP: 002b:00007ffcc7955d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fe2de2caae0 RCX: 00007fe2de3f60a8
RDX: 00007ffcc7955eac RSI: 0000000000000001 RDI: 0000000000000008
RBP: 000055cb8605d960 R08: 000055cb86050d60 R09: 00007fe2de4d0b10
R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007ffcc7955eac R15: 00007ffcc7955ea0
 </TASK>
task:udevd           state:S stack:24272 pid:26207 tgid:26207 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb8605d960 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb8605ab80
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:kworker/0:3     state:I
 stack:22048 pid:26219 tgid:26219 ppid:2      flags:0x00004000
Workqueue:  0x0 (events)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/0:0     state:I
 stack:22336 pid:28933 tgid:28933 ppid:2      flags:0x00004000
Workqueue:  0x0
 (events)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/1:4     state:D
 stack:23104 pid:29212 tgid:29212 ppid:2      flags:0x00004000
Workqueue: usb_hub_wq hub_event

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 evdev_disconnect+0x8e/0xb0 drivers/input/evdev.c:1406
 __input_unregister_device+0x1d5/0x450 drivers/input/input.c:2275
 input_unregister_device+0xb9/0x100 drivers/input/input.c:2511
 hidinput_disconnect+0x160/0x3e0 drivers/hid/hid-input.c:2376
 hid_disconnect+0x14d/0x1b0 drivers/hid/hid-core.c:2320
 hid_hw_stop drivers/hid/hid-core.c:2369 [inline]
 hid_device_remove+0x1a8/0x260 drivers/hid/hid-core.c:2757
 device_remove+0xc8/0x170 drivers/base/dd.c:567
 __device_release_driver drivers/base/dd.c:1273 [inline]
 device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1296
 bus_remove_device+0x22f/0x420 drivers/base/bus.c:576
 device_del+0x396/0x9f0 drivers/base/core.c:3864
 hid_remove_device drivers/hid/hid-core.c:2939 [inline]
 hid_destroy_device+0xe5/0x150 drivers/hid/hid-core.c:2959
 usbhid_disconnect+0xa0/0xe0 drivers/hid/usbhid/hid-core.c:1458
 usb_unbind_interface+0x1e8/0x970 drivers/usb/core/driver.c:461
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x122/0x170 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1273 [inline]
 device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1296
 bus_remove_device+0x22f/0x420 drivers/base/bus.c:576
 device_del+0x396/0x9f0 drivers/base/core.c:3864
 usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2304
 hub_port_connect drivers/usb/core/hub.c:5361 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
 port_event drivers/usb/core/hub.c:5821 [inline]
 hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5903
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/0:8     state:I stack:23616 pid:29544 tgid:29544 ppid:2      flags:0x00004000
Workqueue:  0x0
 (events)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:udevd           state:S
 stack:27136 pid:30559 tgid:30559 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb860525b0 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fde860
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:udevd           state:S stack:27200 pid:30560 tgid:30560 ppid:2861   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2de402457
RSP: 002b:00007ffcc795b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2de402457
RDX: 0000000000000004 RSI: 00007ffcc795b128 RDI: 0000000000000004
RBP: 000055cb85fdefc0 R08: 0000000000000007 R09: 3dee3c896ab4ba78
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055cb85fe0720
R13: 00007ffcc795b128 R14: 00000000ffffffff R15: 000055cb85fa52c0
 </TASK>
task:kworker/u8:2    state:S
 stack:27328 pid:30942 tgid:30942 ppid:2      flags:0x00004000
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 do_wait+0x1dd/0x570 kernel/exit.c:1697
 kernel_wait+0xa0/0x160 kernel/exit.c:1868
 call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
 call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:syz.8.6278      state:D stack:24064 pid:32047 tgid:32047 ppid:23838  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f865352e719
RSP: 002b:00007ffe75102f68 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 00007ffe75103090 RCX: 00007f865352e719
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f86536e5f8c
RBP: 00007f86536e5f8c R08: 00007f8654222080 R09: 00007ffe7510325f
R10: 00007ffe75103070 R11: 0000000000000246 R12: 00000000002cb2f6
R13: 00007ffe75103070 R14: 000000000000015e R15: 00000000002cb198
 </TASK>
task:syz.5.6279      state:D stack:27856 pid:32051 tgid:32050 ppid:23844  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f053dc2e31b
RSP: 002b:00007f053c8a4f10 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f053dc2e31b
RDX: 00007f053c8a5fe0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f053c8a5fe0 R08: 0000000000000000 R09: 00352e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000020000040 R15: 00007f053dcab30b
 </TASK>
task:syz.9.6280      state:D stack:28976 pid:32053 tgid:32052 ppid:23859  flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_register_driver_owner+0x20f/0x330 drivers/usb/gadget/udc/core.c:1722
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:595 [inline]
 raw_ioctl+0x1731/0x2b90 drivers/usb/gadget/legacy/raw_gadget.c:1306
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f422c18e31b
RSP: 002b:00007f422adfef10 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f422c18e31b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007f422adfffe0 R08: 0000000000000000 R09: 00392e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f422adfefb0 R14: 0000000020000000 R15: 00007f422c470b88
 </TASK>
task:syz.7.6281      state:D stack:27904 pid:32060 tgid:32054 ppid:23855  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:syz.6.6282      state:D stack:28656 pid:32057 tgid:32056 ppid:23830  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_register_driver_owner+0x20f/0x330 drivers/usb/gadget/udc/core.c:1722
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:595 [inline]
 raw_ioctl+0x1731/0x2b90 drivers/usb/gadget/legacy/raw_gadget.c:1306
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6389e1e31b
RSP: 002b:00007f6388a94f10 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f6389e1e31b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007f6388a95fe0 R08: 0000000000000000 R09: 00362e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6388a94fb0 R14: 0000000020000000 R15: 00007f638a100b88
 </TASK>
task:kworker/1:7     state:I stack:30016 pid:32061 tgid:32061 ppid:2      flags:0x00004000
Workqueue:  0x0 (mm_percpu_wq)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:syz-executor    state:S stack:25424 pid:32062 tgid:32062 ppid:2953   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 do_wait+0x1dd/0x570 kernel/exit.c:1697
 kernel_wait4+0x16c/0x280 kernel/exit.c:1851
 __do_sys_wait4+0x15f/0x170 kernel/exit.c:1879
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f17e96e4953
RSP: 002b:00007ffcf3be2c88 EFLAGS: 00000202
 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000007d3f RCX: 00007f17e96e4953
RDX: 0000000040000000 RSI: 00007ffcf3be2c9c RDI: 00000000ffffffff
RBP: 00007ffcf3be2c9c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
task:syz-executor    state:D
 stack:25616 pid:32063 tgid:32063 ppid:32062  flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_timeout+0x258/0x2a0 kernel/time/timer.c:2591
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
 call_usermodehelper_exec+0x3c4/0x4d0 kernel/umh.c:442
 call_modprobe kernel/module/kmod.c:103 [inline]
 __request_module+0x3f6/0x6c0 kernel/module/kmod.c:173
 dev_load+0x1ff/0x240 net/core/dev_ioctl.c:645
 dev_ioctl+0x473/0x10c0 net/core/dev_ioctl.c:709
 sock_do_ioctl+0x19e/0x280 net/socket.c:1241
 sock_ioctl+0x228/0x6c0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f17e96ee31b
RSP: 002b:00007ffcf3be2360 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f17e96ee31b
RDX: 00007ffcf3be23c0 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffcf3be23c0 R08: 0000000000000005 R09: 006e616c765f3068
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f17e9761f3d R14: 00007f17ea3d4620 R15: 0000000000000003
 </TASK>
task:syz-executor    state:S stack:25424 pid:32078 tgid:32078 ppid:2953   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 do_wait+0x1dd/0x570 kernel/exit.c:1697
 kernel_wait4+0x16c/0x280 kernel/exit.c:1851
 __do_sys_wait4+0x15f/0x170 kernel/exit.c:1879
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe074cf4953
RSP: 002b:00007ffe3c0d0168 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000007d54 RCX: 00007fe074cf4953
RDX: 0000000040000000 RSI: 00007ffe3c0d017c RDI: 00000000ffffffff
RBP: 00007ffe3c0d017c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
task:syz-executor    state:S stack:25024 pid:32079 tgid:32079 ppid:2953   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 do_wait+0x1dd/0x570 kernel/exit.c:1697
 kernel_wait4+0x16c/0x280 kernel/exit.c:1851
 __do_sys_wait4+0x15f/0x170 kernel/exit.c:1879
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa8b6254953
RSP: 002b:00007ffee8607178 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000007d67 RCX: 00007fa8b6254953
RDX: 0000000040000000 RSI: 00007ffee860718c RDI: 00000000ffffffff
RBP: 00007ffee860718c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
task:syz-executor    state:D stack:26784 pid:32084 tgid:32084 ppid:32078  flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/26 21:00 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c6d9e43954bf 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in sys_epoll_wait
2024/10/24 02:36 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c6d9e43954bf 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in sys_epoll_wait
2024/10/19 01:44 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 07b887f8236e cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in sys_epoll_wait
* Struck through repros no longer work on HEAD.