INFO: task syz.0.1632:11925 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1632      state:D stack:27080 pid:11925 tgid:11910 ppid:5811   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
 vhost_task_stop+0x79/0xe0 kernel/vhost_task.c:102
 kvm_mmu_pre_destroy_vm+0x44/0x60 arch/x86/kvm/mmu/mmu.c:7668
 kvm_destroy_vm virt/kvm/kvm_main.c:1277 [inline]
 kvm_put_kvm+0x236/0xb40 virt/kvm/kvm_main.c:1346
 kvm_vcpu_release+0x4b/0x70 virt/kvm/kvm_main.c:4018
 __fput+0x3ff/0xb70 fs/file_table.c:465
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 get_signal+0x1d1/0x26d0 kernel/signal.c:2807
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e4a78e969
RSP: 002b:00007f8e4b515038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 00007f8e4a9b6160 RCX: 00007f8e4a78e969
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000008
RBP: 00007f8e4a810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8e4a9b6160 R15: 00007ffdf202d078
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:2/36:
 #0: ffff8881482c5148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90000ad7d18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
5 locks held by kworker/u8:3/57:
2 locks held by getty/5572:
 #0: ffff8880324e10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xf70/0x12c0 kernel/hung_task.c:437
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 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 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:pvclock_scale_delta arch/x86/include/asm/pvclock.h:54 [inline]
RIP: 0010:__pvclock_read_cycles arch/x86/include/asm/pvclock.h:87 [inline]
RIP: 0010:__pvclock_clocksource_read arch/x86/kernel/pvclock.c:77 [inline]
RIP: 0010:pvclock_clocksource_read_nowd+0x94/0x100 arch/x86/kernel/pvclock.c:120
Code: 01 75 17 48 8b 05 fc 72 3d 08 48 39 c8 73 27 f0 48 0f b1 0d ee 72 3d 08 75 f0 48 83 c4 10 48 89 c8 5b 5d 41 5c c3 cc cc cc cc <f7> d9 83 f9 3f 7f 0a 48 d3 e8 eb a3 48 89 c1 eb df 48 63 d1 48 89
RSP: 0018:ffffc90000197bb0 EFLAGS: 00000086
RAX: 000001c62c82f174 RBX: ffffffff93aa2040 RCX: 00000000ffffffff
RDX: 00000000ffffffff RSI: ffffffff815f269b RDI: ffffffff93aa2040
RBP: 00000000b6db71fe R08: 0000000000000001 R09: fffff52000032f73
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000008
R13: ffff88801dad2f30 R14: 0000000000000046 R15: ffff88801dad2f30
FS:  0000000000000000(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbee017fab8 CR3: 000000007cb5f000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 000000000000000a DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_sched_clock_read+0x11/0x20 arch/x86/kernel/kvmclock.c:91
 sched_clock+0x17/0x60 arch/x86/kernel/tsc.c:287
 __lock_pin_lock kernel/locking/lockdep.c:5628 [inline]
 lock_pin_lock+0xb3/0x150 kernel/locking/lockdep.c:5959
 rq_pin_lock kernel/sched/sched.h:1761 [inline]
 rq_lock kernel/sched/sched.h:1838 [inline]
 __schedule+0x34c/0x5de0 kernel/sched/core.c:6691
 schedule_idle+0x5c/0x90 kernel/sched/core.c:6886
 do_idle+0x2b6/0x510 kernel/sched/idle.c:353
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x148
 </TASK>