INFO: task kworker/1:0H:25 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0H    state:D stack:26152 pid:25    tgid:25    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: kblockd blk_mq_requeue_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 wait_for_reconnect drivers/block/nbd.c:1104 [inline]
 nbd_handle_cmd drivers/block/nbd.c:1146 [inline]
 nbd_queue_rq+0x662/0xf10 drivers/block/nbd.c:1204
 blk_mq_dispatch_rq_list+0x4bd/0x1900 block/blk-mq.c:2120
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
 blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
 __blk_mq_sched_dispatch_requests+0xda4/0x1570 block/blk-mq-sched.c:307
 blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
 blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2358
 blk_mq_run_hw_queues+0x33e/0x430 block/blk-mq.c:2407
 blk_mq_requeue_work+0x717/0x760 block/blk-mq.c:1574
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf93/0xfe0 kernel/hung_task.c:491
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 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: 17107 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:filter_irq_stacks+0x2d/0xa0 kernel/stacktrace.c:397
Code: fa 41 57 41 56 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 94 d0 76 00 49 8b 04 de 48 3d 30
RSP: 0018:ffffc9001c67f908 EFLAGS: 00000a02
RAX: 1ffff920038cff37 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffffc9001c67f9a0
RBP: ffffc9001c67fbd0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc9001c67f8b8 R11: ffffffff81ac3810 R12: 0000000000000009
R13: dffffc0000000000 R14: ffffc9001c67f9a0 R15: ffffc9001c67f9b8
FS:  00007fafcd238c80(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fafcd2cd2fe CR3: 000000007ea52000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 stack_depot_save_flags+0x40/0x860 lib/stackdepot.c:659
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_save_track+0x4f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2417 [inline]
 slab_free mm/slub.c:4680 [inline]
 kmem_cache_free+0x18f/0x400 mm/slub.c:4782
 user_path_at+0x44/0x60 fs/namei.c:3129
 user_statfs+0x94/0x170 fs/statfs.c:103
 __do_sys_statfs fs/statfs.c:193 [inline]
 __se_sys_statfs fs/statfs.c:190 [inline]
 __x64_sys_statfs+0xe0/0x1b0 fs/statfs.c:190
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fafcd3f6487
Code: 1f 40 00 48 89 f2 31 c9 48 89 fe bf 9c ff ff ff e9 8e c6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 89 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 41 b9 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffea2409d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 00007fafcd2cd2fe RCX: 00007fafcd3f6487
RDX: 00007fafcd2d61d4 RSI: 00007ffea2409de0 RDI: 00007fafcd2cd2fe
RBP: 00007ffea2409de0 R08: 00007fafcd5e0af8 R09: 0000000000000000
R10: 00007ffea2409b90 R11: 0000000000000246 R12: 00007ffea2409f68
R13: 00007ffea2409f90 R14: 00007fafcd2d44d0 R15: 0000000000000000
 </TASK>