INFO: task syz.1.1965:13846 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_t
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1965 state:D stack:27568 pid:13846 tgid:13837 ppid:5646 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
device_lock include/linux/device.h:1109 [inline]
usbdev_open+0x151/0x760 drivers/usb/core/devio.c:1054
chrdev_open+0x4d9/0x600 fs/char_dev.c:413
do_dentry_open+0x80e/0x1360 fs/open.c:1000
vfs_open_consume+0x4a/0x350 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x16fc/0x20f0 fs/namei.c:5016
do_file_open+0x23e/0x4a0 fs/namei.c:5045
do_sys_openat2+0x115/0x200 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1788 [inline]
__se_sys_openat fs/open.c:1783 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1783
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007f9a6cd6034e
RSP: 002b:00007f9a6dba0b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9a6dba16c0 RCX: 00007f9a6cd6034e
RDX: 0000000000160301 RSI: 00007f9a6dba0c00 RDI: ffffffffffffff9c
RBP: 00007f9a6dba0c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f9a6d026218 R14: 00007f9a6d026180 R15: 00007ffee8317db8
Showing all locks held in the system:
locks held by khungtaskd/34: 1, last CPU#1:
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5389: 2, on CPU#0:
#0: ffff888022f400a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032362e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5635: 1, last CPU#1:
#0: ffff888031eaa478 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
locks held by syz-executor/5649: 1, last CPU#1:
#0: ffff88807c32c060 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_read+0x123/0x10c0 fs/pipe.c:357
locks held by kworker/0:4/5739: 6, last CPU#0:
#0: ffff888023af1150 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff888023af1150 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff888023af1150 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff888023af1150 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc9000470fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc9000470fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc9000470fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc9000470fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#2: ffff88802b49b1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#2: ffff88802b49b1d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30 drivers/usb/core/hub.c:5917
#3: ffff88802ea3c1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#3: ffff88802ea3c1d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1106
#4: ffff88804f1911a0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#4: ffff88804f1911a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1106
#5: ffffffff9015a680 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#5: ffffffff9015a680 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2644 [inline]
#5: ffffffff9015a680 (rcu_callback){....}-{0:0}, at: rcu_core+0x8b0/0x1230 kernel/rcu/tree.c:2919
locks held by syz-executor/8775: 4, last CPU#1:
#0: ffffffff9023a6d0 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1538 [inline]
#0: ffffffff9023a6d0 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0xf6/0x640 kernel/fork.c:1604
#1: ffff88807a4de540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#1: ffff88807a4de540 (&mm->mmap_lock){++++}-{4:4}, at: dup_mm kernel/fork.c:1539 [inline]
#1: ffff88807a4de540 (&mm->mmap_lock){++++}-{4:4}, at: copy_mm+0x110/0x640 kernel/fork.c:1604
#2: ffff88813fe3f180 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:556 [inline]
#2: ffff88813fe3f180 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1f6/0x1c80 mm/mmap.c:1722
#3: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 mm/pgtable-generic.c:302
locks held by syz.1.1965/13846: 1, on CPU#0:
#0: ffff88802b49b1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#0: ffff88802b49b1d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x151/0x760 drivers/usb/core/devio.c:1054
locks held by syz-executor/13935: 3, last CPU#1:
#0: ffffffff9023a6d0 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1538 [inline]
#0: ffffffff9023a6d0 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0xf6/0x640 kernel/fork.c:1604
#1: ffff888036fd8f80 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#1: ffff888036fd8f80 (&mm->mmap_lock){++++}-{4:4}, at: dup_mm kernel/fork.c:1539 [inline]
#1: ffff888036fd8f80 (&mm->mmap_lock){++++}-{4:4}, at: copy_mm+0x110/0x640 kernel/fork.c:1604
#2: ffff88813fe3b440 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:556 [inline]
#2: ffff88813fe3b440 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1f6/0x1c80 mm/mmap.c:1722
locks held by rm/14999: 2, last CPU#0:
#0: ffff88807cbb4080 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#0: ffff88807cbb4080 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0x1073/0x10f0 kernel/hung_task.c:598
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5739 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:121 [inline]
RIP: 0010:lock_acquire+0x91/0x350 kernel/locking/lockdep.c:5918
Code: 0f 84 e9 00 00 00 48 8b b4 24 88 00 00 00 4c 89 e7 e8 83 15 9d 00 83 3d 2c 2a 1a 10 00 0f 84 e4 00 00 00 65 8b 05 e7 7a 3e 13 <85> c0 0f 85 d5 00 00 00 65 48 8b 2d 27 33 3e 13 83 bd a4 0b 00 00
RSP: 0018:ffffc90000007ee8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 8000000001000002
RDX: 0000000000000000 RSI: ffffffff8c0c2b3e RDI: 1ffff110170450c3
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100f8da7d1 R12: ffff8880b8228618
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881233f9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9cc2c76c8 CR3: 000000002ad56000 CR4: 00000000003526f0
Call Trace:
__raw_spin_lock include/linux/spinlock_api_smp.h:190 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173
class_raw_spinlock_constructor include/linux/spinlock.h:559 [inline]
__hrtimer_rearm_deferred+0x99/0x4b0 kernel/time/hrtimer.c:2193
hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:58 [inline]
hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:67 [inline]
__irq_exit_rcu+0x14f/0x220 kernel/softirq.c:785
irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1073 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1073
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0xad5/0x2550 arch/x86/kernel/unwind_orc.c:610
Code: 3c 20 00 74 08 48 89 df e8 08 e9 c8 00 48 8b 3b 48 85 ff 0f 84 b9 0d 00 00 48 83 c7 70 e8 c3 25 00 00 49 89 c0 48 8b 54 24 08 <48> 8d 5a 01 48 8b 44 24 30 42 0f b6 04 20 84 c0 4c 89 04 24 0f 85
RSP: 0018:ffffc9000470e580 EFLAGS: 00000282
RAX: 0000000000000010 RBX: ffffffff92a84f79 RCX: ffffffff920d6de4
RDX: ffffffff92a84f7c RSI: ffffffff92a84f78 RDI: ffffffff8c8eba20
RBP: ffffc9000470e660 R08: ffffc9000470f580 R09: 0000000000000000
R10: ffffc9000470e678 R11: ffffffff81b3c4c0 R12: dffffc0000000000
R13: ffffffff92a84f78 R14: ffffc9000470e628 R15: 1ffff920008e1cc5
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3f/0x90 mm/kasan/common.c:79
poison_kmalloc_redzone mm/kasan/common.c:412 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:429
kasan_kmalloc include/linux/kasan.h:267 [inline]
__kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5676
_kmalloc_noprof include/linux/slab.h:991 [inline]
dummy_urb_enqueue+0x7c/0x7a0 drivers/usb/gadget/udc/dummy_hcd.c:1327
usb_hcd_submit_urb+0x328/0x1b60 drivers/usb/core/hcd.c:1543
ath6kl_usb_post_recv_transfers+0x3a6/0x680 drivers/net/wireless/ath/ath6kl/usb.c:449
ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:497 [inline]
hif_start drivers/net/wireless/ath/ath6kl/usb.c:702 [inline]
ath6kl_usb_power_on+0x6a/0x280 drivers/net/wireless/ath/ath6kl/usb.c:1061
ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline]
ath6kl_core_init+0x1e1/0x10c0 drivers/net/wireless/ath/ath6kl/core.c:97
ath6kl_usb_probe+0x14b9/0x15b0 drivers/net/wireless/ath/ath6kl/usb.c:1162
usb_probe_interface+0x751/0xe00 drivers/usb/core/driver.c:399
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:707
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869
driver_probe_device+0x4f/0x240 drivers/base/dd.c:899
__device_attach_driver+0x270/0x410 drivers/base/dd.c:1027
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2bd/0x430 drivers/base/dd.c:1131
device_initial_probe+0x9c/0x100 drivers/base/dd.c:1190
__bus_probe_device+0x126/0x220 drivers/base/bus.c:614
device_add+0x7d7/0xb80 drivers/base/core.c:3778
usb_set_configuration+0x1bb5/0x2260 drivers/usb/core/message.c:2280
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:707
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869
driver_probe_device+0x4f/0x240 drivers/base/dd.c:899
__device_attach_driver+0x270/0x410 drivers/base/dd.c:1027
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2bd/0x430 drivers/base/dd.c:1131
device_initial_probe+0x9c/0x100 drivers/base/dd.c:1190
__bus_probe_device+0x126/0x220 drivers/base/bus.c:614
device_add+0x7d7/0xb80 drivers/base/core.c:3778
usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2713
hub_port_connect drivers/usb/core/hub.c:5585 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5725 [inline]
port_event drivers/usb/core/hub.c:5889 [inline]
hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5971
process_one_work kernel/workqueue.c:3505 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245