rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7564/2:b..l P7565/1:b..l P7597/2:b..l
rcu: (detected by 1, t=10503 jiffies, g=28493, q=412 ncpus=2)
task:syz.2.447 state:X running task stack:28048 pid:7597 tgid:7564 ppid:0 task_flags:0x40044c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:rcu_is_watching+0x83/0xc0 kernel/rcu/tree.c:755
Code: c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 03 c1 e8 02 83 e0 01 65 ff 0d c0 bb 75 12 74 07 5b <5d> c3 cc cc cc cc e8 42 08 88 ff 5b 5d e9 db 4c cf 09 48 89 df e8
RSP: 0000:ffffc9000401fab0 EFLAGS: 00000286
RAX: 0000000000000001 RBX: ffffffff8ebe6180 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c401300 RDI: ffffffff8e46c920
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff22448b2
R10: ffffffff91224597 R11: 0000000000000000 R12: 00000000fffffffc
R13: 0000000000000025 R14: ffff88813fffb140 R15: ffff888028d618e8
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x24d/0x310 kernel/locking/lockdep.c:5879
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock+0x1c/0x60 include/linux/rcupdate.h:871
mod_lruvec_state mm/memcontrol.c:973 [inline]
lruvec_stat_mod_folio+0x251/0x2e0 mm/memcontrol.c:993
mod_lruvec_page_state include/linux/vmstat.h:528 [inline]
account_kernel_stack kernel/fork.c:492 [inline]
exit_task_stack_account+0xc8/0x200 kernel/fork.c:505
do_exit+0x1648/0x2ae0 kernel/exit.c:1042
do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8ef159de99
RSP: 002b:00007f8eef7d50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f8ef1826098 RCX: 00007f8ef159de99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8ef1826098
RBP: 00007f8ef1826090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ef1826128 R14: 00007ffef6e54ec0 R15: 00007ffef6e54fa8
task:syz.2.447 state:R running task stack:27848 pid:7565 tgid:7564 ppid:5613 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:unwind_next_frame+0x4d6/0x2090 arch/x86/kernel/unwind_orc.c:520
Code: e8 6f f3 ff ff 48 89 c1 48 85 c0 0f 84 dc 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 79 05 4c 89 fa 48 c1 ea 03 0f b6 04 02 <4c> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 51 15 00 00 0f b6 41 05
RSP: 0000:ffffc900036e7638 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff91d4f786
RDX: 1ffffffff23a9ef1 RSI: 0000000000000000 RDI: ffffffff91465b28
RBP: ffffc900036e76f0 R08: ffffffff91d4f78c R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000018ed8 R12: ffffc900036e76f8
R13: ffffc900036e76a8 R14: ffffc900036e76dd R15: ffffffff91d4f78b
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3159
kernfs_put.part.0+0x3a6/0xaa0 fs/kernfs/dir.c:618
kernfs_put fs/kernfs/dir.c:1787 [inline]
kernfs_remove_by_name_ns+0xf3/0x120 fs/kernfs/dir.c:1798
sysfs_remove_file include/linux/sysfs.h:780 [inline]
driver_remove_file drivers/base/driver.c:126 [inline]
driver_remove_file+0x4a/0x60 drivers/base/driver.c:122
remove_bind_files drivers/base/bus.c:690 [inline]
bus_remove_driver+0x248/0x2e0 drivers/base/bus.c:828
driver_unregister+0x76/0xb0 drivers/base/driver.c:202
usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784
raw_release+0x19b/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463
__fput+0x3ff/0xb50 fs/file_table.c:512
task_work_run+0x150/0x240 kernel/task_work.c:233
get_signal+0x1bd/0x21e0 kernel/signal.c:2818
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8ef159db2b
RSP: 002b:00007f8eef7f3f50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000004 RCX: 00007f8ef159db2b
RDX: 00007f8eef7f4fe0 RSI: 0000000080085502 RDI: 0000000000000004
RBP: 00007f8ef1633eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000200000002280
R13: 0000000000000000 R14: 00007f8ef1825fa0 R15: 00007ffef6e54fa8
task:syz.2.447 state:Z running task stack:26168 pid:7564 tgid:7564 ppid:5613 task_flags:0x40044c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__mod_memcg_lruvec_state+0x47c/0x5b0 mm/memcontrol.c:934
mod_memcg_lruvec_state+0x1d0/0x280 mm/memcontrol.c:950
mod_lruvec_state mm/memcontrol.c:973 [inline]
lruvec_stat_mod_folio+0x251/0x2e0 mm/memcontrol.c:993
mod_lruvec_page_state include/linux/vmstat.h:528 [inline]
account_kernel_stack kernel/fork.c:492 [inline]
exit_task_stack_account+0xc8/0x200 kernel/fork.c:505
do_exit+0x1648/0x2ae0 kernel/exit.c:1042
do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8ef155e6ce
RSP: 002b:00007ffef6e55088 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 000055558c754500 RCX: 00007f8ef155e6ce
RDX: 00007ffef6e550e0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8ef1827da0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000374bf
R13: 00007f8ef182609c R14: 0000000000036901 R15: 00007ffef6e55210
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g28493 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=11598
rcu: rcu_preempt kthread starved for 10501 jiffies! g28493 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27592 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7608 Comm: syz.0.457 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:check_preemption_disabled+0x1c/0xe0 lib/smp_processor_id.c:54
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 55 53 48 83 ec 08 65 8b 1d d5 95 a9 08 65 f7 05 c6 95 a9 08 ff ff ff 7f 74 0f <48> 83 c4 08 89 d8 5b 5d 41 5c c3 cc cc cc cc 9c 58 f6 c4 02 74 ea
RSP: 0018:ffffc90000007d10 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
RDX: ffffffff9b99f4c0 RSI: ffffffff8c401300 RDI: ffffffff8c401340
RBP: ffffffff85274744 R08: 0000000000000001 R09: fffff52000000fa4
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88803605f300 R15: 1ffff92000000fb8
FS: 00007f870a8c16c0(0000) GS:ffff888123de6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f870a8bffe0 CR3: 000000004a723000 CR4: 00000000003526f0
Call Trace:
rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
rcu_is_watching+0x12/0xc0 kernel/rcu/tree.c:752
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x24d/0x310 kernel/locking/lockdep.c:5879
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:198
debug_object_deactivate+0x2e4/0x3b0 lib/debugobjects.c:951
debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
__run_hrtimer kernel/time/hrtimer.c:2000 [inline]
__hrtimer_run_queues+0x2e9/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 90 28 f6 48 89 df e8 de df 28 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 ef 17 f6 65 8b 05 ee b8 a6 08 85 c0 74 16 5b
RSP: 0018:ffffc90004af7b28 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9b7353d8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e1a4784 RDI: ffffffff8c401380
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffffffffffff R12: ffffffff9b735140
R13: 0000000000000000 R14: ffffc90004af7c80 R15: ffffffff9b73531c
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
__do_adjtimex+0x892/0xe70 kernel/time/timekeeping.c:2953
do_adjtimex+0xa0/0x370 kernel/time/timekeeping.c:2996
do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
__do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1181
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f870999de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f870a8c1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f8709c26090 RCX: 00007f870999de99
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000000
RBP: 00007f8709a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8709c26128 R14: 00007f8709c26090 R15: 00007ffd4bcb9618