INFO: task kworker/0:2:62 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:0     pid:62    tgid:62    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16a0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 anon_pipe_write+0x12d/0x1390 fs/pipe.c:458
 __kernel_write_iter+0x439/0x930 fs/read_write.c:619
 __kernel_write fs/read_write.c:639 [inline]
 kernel_write+0x2b1/0x640 fs/read_write.c:660
 p9_fd_write net/9p/trans_fd.c:434 [inline]
 p9_write_work+0x54e/0xd30 net/9p/trans_fd.c:485
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x7d5/0x1040 kernel/workqueue.c:3319
 worker_thread+0xc4e/0x1270 kernel/workqueue.c:3400
 kthread+0x6f4/0x880 kernel/kthread.c:463
 ret_from_fork+0x14a/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task kworker/0:4:491 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4     state:D stack:0     pid:491   tgid:491   ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16a0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 anon_pipe_write+0x12d/0x1390 fs/pipe.c:458
 __kernel_write_iter+0x439/0x930 fs/read_write.c:619
 __kernel_write fs/read_write.c:639 [inline]
 kernel_write+0x2b1/0x640 fs/read_write.c:660
 p9_fd_write net/9p/trans_fd.c:434 [inline]
 p9_write_work+0x54e/0xd30 net/9p/trans_fd.c:485
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x7d5/0x1040 kernel/workqueue.c:3319
 worker_thread+0xc4e/0x1270 kernel/workqueue.c:3400
 kthread+0x6f4/0x880 kernel/kthread.c:463
 ret_from_fork+0x14a/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT  ae70c7942a6bb2c16ff5c721b87cb7ea4c2720b4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10b/0x180 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bd/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xc2c/0xc80 kernel/hung_task.c:491
 kthread+0x6f4/0x880 kernel/kthread.c:463
 ret_from_fork+0x14a/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT  ae70c7942a6bb2c16ff5c721b87cb7ea4c2720b4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1301 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:187 [inline]
RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
RIP: 0010:_raw_spin_lock_irqsave+0xa1/0x150 kernel/locking/spinlock.c:162
Code: 24 30 00 00 00 00 9c 8f 44 24 30 4c 8b 74 24 30 fa 65 ff 05 41 32 e8 02 c7 44 24 20 00 00 00 00 be 04 00 00 00 e8 8f 85 5c fc <4c> 89 ff be 04 00 00 00 e8 82 85 5c fc 8b 44 24 20 b9 01 00 00 00
RSP: 0018:ffffffff87207a80 EFLAGS: 00000056
RAX: f300f204f1f1f101 RBX: ffff8881f6e27cc0 RCX: ffffffff85a0ee01
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881f6e27cc0
RBP: ffffffff87207b30 R08: ffff8881f6e27cc3 R09: 1ffff1103edc4f98
R10: dffffc0000000000 R11: ffffed103edc4f99 R12: dffffc0000000000
R13: 1ffffffff0e40f50 R14: 0000000000000806 R15: ffffffff87207aa0
FS:  0000000000000000(0000) GS:ffff88826e58e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005631d6f6b810 CR3: 0000000125948000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 hrtimer_get_next_event+0x3b/0x7e0 kernel/time/hrtimer.c:1530
 cmp_next_hrtimer_event kernel/time/timer.c:1934 [inline]
 __get_next_timer_interrupt+0x6c7/0xa20 kernel/time/timer.c:2276
 get_next_timer_interrupt+0x23/0x40 kernel/time/timer.c:2292
 tick_nohz_next_event+0x20e/0x450 kernel/time/tick-sched.c:922
 tick_nohz_idle_stop_tick+0x109/0x910 kernel/time/tick-sched.c:1218
 cpuidle_idle_call kernel/sched/idle.c:188 [inline]
 do_idle+0x197/0x470 kernel/sched/idle.c:330
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:428
 rest_init+0x10b/0x130 init/main.c:744
 start_kernel+0x3a4/0x3db init/main.c:1097
 x86_64_start_reservations+0x28/0x30 arch/x86/kernel/head64.c:307
 x86_64_start_kernel+0x147/0x1cb arch/x86/kernel/head64.c:288
 common_startup_64+0x13b/0x157
 </TASK>