INFO: task syz.2.3578:13950 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3578      state:D stack:27280 pid:13950 tgid:13948 ppid:5612   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
 device_lock include/linux/device.h:1102 [inline]
 usbdev_open+0x151/0x770 drivers/usb/core/devio.c:1054
 chrdev_open+0x4d9/0x600 fs/char_dev.c:411
 do_dentry_open+0x816/0x1380 fs/open.c:947
 vfs_open+0x3b/0x340 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x2e44/0x3830 fs/namei.c:4863
 do_file_open+0x23e/0x4a0 fs/namei.c:4892
 do_sys_openat2+0x115/0x200 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86f5d5e90e
RSP: 002b:00007f86f6bedb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f86f6bee6c0 RCX: 00007f86f5d5e90e
RDX: 0000000000109301 RSI: 00007f86f6bedc00 RDI: ffffffffffffff9c
RBP: 00007f86f6bedc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f86f6026038 R14: 00007f86f6025fa0 R15: 00007ffe15a9d288
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/1:0/24:
3 locks held by kworker/1:2/30:
1 lock held by khungtaskd/32:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:5/78:
2 locks held by getty/5358:
 #0: ffff8880354d70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:9/5810:
1 lock held by syz.2.3578/13950:
 #0: ffff888029fd31d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
 #0: ffff888029fd31d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x151/0x770 drivers/usb/core/devio.c:1054
1 lock held by sed/16628:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [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:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16627 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:memset+0xf/0x30 arch/x86/lib/memset_64.S:38
Code: 44 88 1f e9 2e 64 3f f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 e9 02 64 3f f5 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a08d60 EFLAGS: 00000002
RAX: 6de0dfc606eab900 RBX: ffff88807b3ed938 RCX: 000000000000000f
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000a08d81
RBP: 0000000000000000 R08: ffffc90000a08d8f R09: ffffc90000a08d80
R10: dffffc0000000000 R11: fffff520001411b2 R12: 0000000000000001
R13: dffffc0000000000 R14: ffffffff8bef7f00 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125055000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efce4540a10 CR3: 0000000079d99000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 debug_object_activate+0x38/0x420 lib/debugobjects.c:861
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 enqueue_hrtimer+0xa9/0x2c0 kernel/time/hrtimer.c:1109
 __run_hrtimer kernel/time/hrtimer.c:2048 [inline]
 __hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__kernel_text_address+0x25/0x30 kernel/extable.c:79
Code: 90 90 90 90 90 0f 1f 40 d6 53 48 89 fb e8 33 00 00 00 48 81 fb 00 e0 c8 91 0f 93 c1 48 81 fb 50 1f e1 91 0f 92 c2 20 ca 08 c2 <0f> b6 c2 5b e9 0d dd 7f ff cc 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000204f5f8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81000130 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8e4ad94a RDI: ffffffff81000130
RBP: ffffc9000204f6b0 R08: ffffc9000204ff38 R09: ffffc9000204f678
R10: dffffc0000000000 R11: fffff52000409ed1 R12: ffff88801e39be00
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000409ece
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 slab_free_hook mm/slub.c:2638 [inline]
 slab_free mm/slub.c:6377 [inline]
 kmem_cache_free+0x44f/0x650 mm/slub.c:6504
 tear_down_vmas+0x312/0x520 mm/mmap.c:1262
 exit_mmap+0x4ca/0x9f0 mm/mmap.c:1320
 __mmput+0x118/0x420 kernel/fork.c:1187
 exit_mm+0x221/0x2d0 kernel/exit.c:615
 do_exit+0x6cd/0x2360 kernel/exit.c:997
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1152
 __do_sys_exit_group kernel/exit.c:1163 [inline]
 __se_sys_exit_group kernel/exit.c:1161 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1161
 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f695e6e66c5
Code: Unable to access opcode bytes at 0x7f695e6e669b.
RSP: 002b:00007ffd88c8cfe8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffd88c8d304 RCX: 00007f695e6e66c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000003 R08: 00007ffd88c8d0e0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd88c8d320 R14: 00007f695e8f6000 R15: 0000560580e6ad98
 </TASK>