INFO: task syz-executor.0:6064 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27880 pid:6064  tgid:6063  ppid:6035   task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
 __flush_workqueue+0x3e2/0x1230 kernel/workqueue.c:4000
 nbd_start_device_ioctl drivers/block/nbd.c:1551 [inline]
 __nbd_ioctl drivers/block/nbd.c:1612 [inline]
 nbd_ioctl+0x300/0xda0 drivers/block/nbd.c:1652
 blkdev_ioctl+0x274/0x6d0 block/ioctl.c:705
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd512795e9
RSP: 002b:00007efd522fc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efd5138bf60 RCX: 00007efd512795e9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007efd512d5018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007efd5138bf60 R15: 00007fff87c44ba8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/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+0xf0e/0x1260 kernel/hung_task.c:491
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 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: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:do_raw_write_seqcount_end include/linux/seqlock.h:452 [inline]
RIP: 0010:do_write_seqcount_end include/linux/seqlock.h:524 [inline]
RIP: 0010:psi_write_end kernel/sched/psi.c:188 [inline]
RIP: 0010:psi_task_switch+0x457/0xb10 kernel/sched/psi.c:1002
Code: df 48 8b 54 24 10 48 c1 ea 03 80 3c 02 00 0f 85 c7 05 00 00 48 03 2c dd 60 de f5 8d 48 8b 74 24 60 48 8d 7d 08 e8 09 6b 01 00 <48> b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc90000197bc8 EFLAGS: 00000082
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81945b7a
RDX: 0000000000000000 RSI: ffffffff8c162880 RDI: 0000000000000000
RBP: ffff8880b8524080 R08: 0000000000000000 R09: fffffbfff1c95d0a
R10: ffffffff8e4ae857 R11: 0000000000000001 R12: ffff88801e2f2440
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b85240c0
FS:  0000000000000000(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561c559fe660 CR3: 000000000e380000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 psi_sched_switch kernel/sched/stats.h:220 [inline]
 __schedule+0x1861/0x5de0 kernel/sched/core.c:6955
 schedule_idle+0x5c/0x90 kernel/sched/core.c:7084
 do_idle+0x2b6/0x510 kernel/sched/idle.c:358
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x148
 </TASK>