Warning: Permanently added '10.128.0.240' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 522.144189][ T6549] block nbd0: shutting down sockets [ 716.188588][ T27] INFO: task syz-executor366:6549 can't die for more than 143 seconds. [ 716.197140][ T27] task:syz-executor366 state:D stack:27528 pid: 6549 ppid: 6548 flags:0x00004004 [ 716.207439][ T27] Call Trace: [ 716.211129][ T27] __schedule+0x940/0x26f0 [ 716.215660][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.221461][ T27] schedule+0xd3/0x270 [ 716.225581][ T27] schedule_timeout+0x1db/0x2a0 [ 716.230956][ T27] ? usleep_range+0x170/0x170 [ 716.235650][ T27] ? wait_for_completion+0x16e/0x280 [ 716.241480][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.246522][ T27] ? do_raw_spin_lock+0x120/0x2b0 [ 716.252156][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.257135][ T27] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.262826][ T27] wait_for_completion+0x176/0x280 [ 716.267969][ T27] ? bit_wait_io_timeout+0x160/0x160 [ 716.273957][ T27] ? flush_workqueue_prep_pwqs+0x290/0x4f0 [ 716.280435][ T27] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.286822][ T27] ? check_flush_dependency+0x86/0x400 [ 716.293012][ T27] flush_workqueue+0x3ed/0x15b0 [ 716.297906][ T27] ? __dev_printk+0xcf/0xf5 [ 716.302867][ T27] ? dev_err_probe.cold+0x21/0x21 [ 716.307916][ T27] ? check_flush_dependency+0x400/0x400 [ 716.314055][ T27] ? sock_shutdown.cold+0x62/0x6e [ 716.319293][ T27] nbd_ioctl+0x631/0xa80 [ 716.323626][ T27] ? nbd_release+0x160/0x160 [ 716.329043][ T27] ? finish_wait+0x270/0x270 [ 716.333745][ T27] ? find_held_lock+0x2d/0x110 [ 716.338926][ T27] ? nbd_release+0x160/0x160 [ 716.343793][ T27] blkdev_ioctl+0x2a1/0x700 [ 716.348762][ T27] ? blkdev_common_ioctl+0x18f0/0x18f0 [ 716.354267][ T27] block_ioctl+0xf9/0x140 [ 716.359040][ T27] ? blkdev_fsync+0xd0/0xd0 [ 716.363589][ T27] __x64_sys_ioctl+0x193/0x200 [ 716.368944][ T27] do_syscall_64+0x35/0xb0 [ 716.373431][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.379770][ T27] RIP: 0033:0x4441e9 [ 716.383677][ T27] RSP: 002b:00007ffcc7ad2b38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 716.392515][ T27] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 00000000004441e9 [ 716.400625][ T27] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 [ 716.408785][ T27] RBP: 0000000000000000 R08: 00007ffcc7ad2cd8 R09: 00007ffcc7ad2cd8 [ 716.417026][ T27] R10: 00007ffcc7ad2cd8 R11: 0000000000000246 R12: 0000000000403500 [ 716.425113][ T27] R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 [ 716.433366][ T27] INFO: task syz-executor366:6549 blocked for more than 143 seconds. [ 716.441614][ T27] Not tainted 5.14.0-next-20210831-syzkaller #0 [ 716.448684][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.457371][ T27] task:syz-executor366 state:D stack:27528 pid: 6549 ppid: 6548 flags:0x00004004 [ 716.466826][ T27] Call Trace: [ 716.470259][ T27] __schedule+0x940/0x26f0 [ 716.474714][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.480107][ T27] schedule+0xd3/0x270 [ 716.484193][ T27] schedule_timeout+0x1db/0x2a0 [ 716.489197][ T27] ? usleep_range+0x170/0x170 [ 716.493890][ T27] ? wait_for_completion+0x16e/0x280 [ 716.500122][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.504987][ T27] ? do_raw_spin_lock+0x120/0x2b0 [ 716.510321][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.515285][ T27] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.520567][ T27] wait_for_completion+0x176/0x280 [ 716.525957][ T27] ? bit_wait_io_timeout+0x160/0x160 [ 716.531388][ T27] ? flush_workqueue_prep_pwqs+0x290/0x4f0 [ 716.537216][ T27] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.543621][ T27] ? check_flush_dependency+0x86/0x400 [ 716.549238][ T27] flush_workqueue+0x3ed/0x15b0 [ 716.554113][ T27] ? __dev_printk+0xcf/0xf5 [ 716.558695][ T27] ? dev_err_probe.cold+0x21/0x21 [ 716.563732][ T27] ? check_flush_dependency+0x400/0x400 [ 716.569397][ T27] ? sock_shutdown.cold+0x62/0x6e [ 716.574441][ T27] nbd_ioctl+0x631/0xa80 [ 716.578769][ T27] ? nbd_release+0x160/0x160 [ 716.583440][ T27] ? finish_wait+0x270/0x270 [ 716.588058][ T27] ? find_held_lock+0x2d/0x110 [ 716.593116][ T27] ? nbd_release+0x160/0x160 [ 716.597731][ T27] blkdev_ioctl+0x2a1/0x700 [ 716.602344][ T27] ? blkdev_common_ioctl+0x18f0/0x18f0 [ 716.607852][ T27] block_ioctl+0xf9/0x140 [ 716.612320][ T27] ? blkdev_fsync+0xd0/0xd0 [ 716.616831][ T27] __x64_sys_ioctl+0x193/0x200 [ 716.621755][ T27] do_syscall_64+0x35/0xb0 [ 716.626190][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.632174][ T27] RIP: 0033:0x4441e9 [ 716.636067][ T27] RSP: 002b:00007ffcc7ad2b38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 716.644549][ T27] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 00000000004441e9 [ 716.652622][ T27] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 [ 716.660737][ T27] RBP: 0000000000000000 R08: 00007ffcc7ad2cd8 R09: 00007ffcc7ad2cd8 [ 716.668812][ T27] R10: 00007ffcc7ad2cd8 R11: 0000000000000246 R12: 0000000000403500 [ 716.676875][ T27] R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 [ 716.685002][ T27] [ 716.685002][ T27] Showing all locks held in the system: [ 716.693040][ T27] 1 lock held by khungtaskd/27: [ 716.697886][ T27] #0: ffffffff8b97fbe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.707849][ T27] 2 locks held by kworker/u5:0/151: [ 716.713156][ T27] #0: ffff88801e1f3138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 [ 716.724171][ T27] #1: ffffc9000138fdb0 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 [ 716.735641][ T27] 1 lock held by in:imklog/6257: [ 716.740680][ T27] [ 716.743060][ T27] ============================================= [ 716.743060][ T27] [ 716.751561][ T27] NMI backtrace for cpu 0 [ 716.755973][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-next-20210831-syzkaller #0 [ 716.764988][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.775131][ T27] Call Trace: [ 716.778639][ T27] dump_stack_lvl+0xcd/0x134 [ 716.783310][ T27] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.788617][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.793859][ T27] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.799868][ T27] watchdog+0xcb7/0xed0 [ 716.804013][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.809752][ T27] kthread+0x3e5/0x4d0 [ 716.813806][ T27] ? set_kthread_struct+0x130/0x130 [ 716.819082][ T27] ret_from_fork+0x1f/0x30 [ 716.823677][ T27] Sending NMI from CPU 0 to CPUs 1: [ 716.828950][ C1] NMI backtrace for cpu 1 [ 716.828961][ C1] CPU: 1 PID: 2964 Comm: systemd-journal Not tainted 5.14.0-next-20210831-syzkaller #0 [ 716.828985][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.828997][ C1] RIP: 0010:lock_release+0xc/0x720 [ 716.829027][ C1] Code: e9 55 fe ff ff 48 c7 c7 e8 9b 6e 8d e8 8d d2 60 00 e9 6d fd ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 41 55 41 54 49 89 fc 55 53 48 81 ec 90 00 00 00 48 8d 6c 24 [ 716.829048][ C1] RSP: 0018:ffffc90002b2fee8 EFLAGS: 00000046 [ 716.829065][ C1] RAX: dffffc0000000000 RBX: ffff88807bfb3900 RCX: 1ffff1100f7f6800 [ 716.829080][ C1] RDX: ffffffff893255af RSI: ffffffff893255af RDI: ffff88807bfb3fc0 [ 716.829095][ C1] RBP: ffff88807bfb3fb8 R08: 0000000000000001 R09: ffffffff8eef904f [ 716.829109][ C1] R10: ffffffff8eef9057 R11: 0000000000000001 R12: ffff88807bfb3fc0 [ 716.829123][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 716.829136][ C1] FS: 00007f45705b98c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.829156][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.829171][ C1] CR2: 00007f456d98e000 CR3: 0000000019eaa000 CR4: 00000000001506e0 [ 716.829185][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.829198][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.829211][ C1] Call Trace: [ 716.829222][ C1] vtime_user_enter+0xea/0x170 [ 716.829308][ C1] __context_tracking_enter+0xef/0x100 [ 716.829336][ C1] syscall_exit_to_user_mode+0x48/0x60 [ 716.829390][ C1] do_syscall_64+0x42/0xb0 [ 716.829410][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.829438][ C1] RIP: 0033:0x7f456f851f17 [ 716.829454][ C1] Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 [ 716.829474][ C1] RSP: 002b:00007fff41f8d4b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 [ 716.829494][ C1] RAX: 0000000000000b94 RBX: 0000564c33bff1e0 RCX: 00007f456f851f17 [ 716.829512][ C1] RDX: 00007fff41f8d578 RSI: 0000000000000001 RDI: 0000564c33bff1e0 [ 716.829526][ C1] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 716.829539][ C1] R10: 0000000000000069 R11: 0000000000000206 R12: 00007fff41f8d578 [ 716.829552][ C1] R13: 0000000000000b94 R14: 00007fff41f90360 R15: 00007fff41f8d970 [ 716.829954][ T27] Kernel panic - not syncing: hung_task: blocked tasks [ 717.071991][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-next-20210831-syzkaller #0 [ 717.081005][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.091149][ T27] Call Trace: [ 717.094436][ T27] dump_stack_lvl+0xcd/0x134 [ 717.099044][ T27] panic+0x2b0/0x6dd [ 717.102962][ T27] ? __warn_printk+0xf3/0xf3 [ 717.108132][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.113354][ T27] ? preempt_schedule_thunk+0x16/0x18 [ 717.118748][ T27] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 717.124901][ T27] ? watchdog.cold+0x1b9/0x1de [ 717.129692][ T27] watchdog.cold+0x1ca/0x1de [ 717.134322][ T27] ? trace_sched_process_hang+0x280/0x280 [ 717.140054][ T27] kthread+0x3e5/0x4d0 [ 717.144128][ T27] ? set_kthread_struct+0x130/0x130 [ 717.149314][ T27] ret_from_fork+0x1f/0x30 [ 717.153887][ T27] Kernel Offset: disabled [ 717.158204][ T27] Rebooting in 86400 seconds..