[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.136' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.851374][ T1171] INFO: task syz-executor338:6839 blocked for more than 143 seconds. [ 595.859630][ T1171] Not tainted 5.8.0-syzkaller #0 [ 595.865518][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.874266][ T1171] syz-executor338 D28096 6839 6833 0x80000002 [ 595.880624][ T1171] Call Trace: [ 595.884188][ T1171] __schedule+0x8e5/0x21e0 [ 595.888612][ T1171] ? io_schedule_timeout+0x140/0x140 [ 595.894115][ T1171] ? io_wq_cancel_all+0x5a0/0x5a0 [ 595.899156][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.904417][ T1171] schedule+0xd0/0x2a0 [ 595.908511][ T1171] io_uring_flush+0x740/0xa90 [ 595.913249][ T1171] ? io_req_task_cancel+0x20/0x20 [ 595.918352][ T1171] ? add_wait_queue_exclusive+0x180/0x180 [ 595.924168][ T1171] ? find_held_lock+0x2d/0x110 [ 595.928958][ T1171] ? lock_is_held_type+0xbb/0xf0 [ 595.933935][ T1171] ? io_req_task_cancel+0x20/0x20 [ 595.939055][ T1171] filp_close+0xb4/0x170 [ 595.943405][ T1171] put_files_struct+0x1cc/0x350 [ 595.948256][ T1171] exit_files+0x7e/0xa0 [ 595.952569][ T1171] do_exit+0xb43/0x29f0 [ 595.956725][ T1171] ? mm_update_next_owner+0x7a0/0x7a0 [ 595.962166][ T1171] ? io_submit_sqes+0x2380/0x2380 [ 595.967278][ T1171] ? __sys_socket+0x16d/0x200 [ 595.972002][ T1171] ? lock_is_held_type+0xbb/0xf0 [ 595.976958][ T1171] do_group_exit+0x125/0x310 [ 595.981648][ T1171] __x64_sys_exit_group+0x3a/0x50 [ 595.986668][ T1171] do_syscall_64+0x2d/0x70 [ 595.991080][ T1171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 595.997012][ T1171] RIP: 0033:0x43f518 [ 596.000900][ T1171] Code: Bad RIP value. [ 596.005069][ T1171] RSP: 002b:00007ffe2a82fb98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 596.013528][ T1171] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f518 [ 596.021596][ T1171] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 596.029560][ T1171] RBP: 00000000004bed28 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 596.037568][ T1171] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 596.045645][ T1171] R13: 00000000006d01a0 R14: 0000000000000000 R15: 0000000000000000 [ 596.053722][ T1171] [ 596.053722][ T1171] Showing all locks held in the system: [ 596.061519][ T1171] 1 lock held by khungtaskd/1171: [ 596.066528][ T1171] #0: ffffffff89bd6380 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.076434][ T1171] 1 lock held by in:imklog/6530: [ 596.081428][ T1171] #0: ffff8880a8babb30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.090534][ T1171] [ 596.092957][ T1171] ============================================= [ 596.092957][ T1171] [ 596.101457][ T1171] NMI backtrace for cpu 1 [ 596.105773][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 596.113631][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.123658][ T1171] Call Trace: [ 596.127024][ T1171] dump_stack+0x18f/0x20d [ 596.131347][ T1171] nmi_cpu_backtrace.cold+0x70/0xb1 [ 596.136567][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.142177][ T1171] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.148182][ T1171] watchdog+0xd7d/0x1000 [ 596.152403][ T1171] ? reset_hung_task_detector+0x30/0x30 [ 596.157951][ T1171] kthread+0x3b5/0x4a0 [ 596.161994][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.167079][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.172190][ T1171] ret_from_fork+0x1f/0x30 [ 596.176701][ T1171] Sending NMI from CPU 1 to CPUs 0: [ 596.182328][ C0] NMI backtrace for cpu 0 [ 596.182334][ C0] CPU: 0 PID: 6832 Comm: kworker/0:0 Not tainted 5.8.0-syzkaller #0 [ 596.182340][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.182343][ C0] Workqueue: 0x0 (events_power_efficient) [ 596.182352][ C0] RIP: 0010:psi_group_change+0x25d/0x7c0 [ 596.182364][ C0] Code: 7d 30 bb 01 00 00 00 45 31 e4 49 bd 00 00 00 00 00 fc ff df 4d 89 fe 49 c1 ee 03 4d 01 ee 8d 4b ff 83 f9 05 0f 87 d7 02 00 00 <89> c8 ff 24 c5 80 92 4b 88 41 0f b6 16 4c 89 f8 83 e0 07 83 c0 03 [ 596.182368][ C0] RSP: 0018:ffffc90000cbfc60 EFLAGS: 00000046 [ 596.182375][ C0] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000005 [ 596.182380][ C0] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880ae620efc [ 596.182385][ C0] RBP: ffff8880ae620ec0 R08: 0000000000000000 R09: 0000000000000000 [ 596.182390][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 596.182395][ C0] R13: dffffc0000000000 R14: ffffed1015cc41de R15: ffff8880ae620ef0 [ 596.182401][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 596.182405][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 596.182410][ C0] CR2: 00007efc0269f000 CR3: 000000009379f000 CR4: 00000000001506f0 [ 596.182415][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 596.182421][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 596.182423][ C0] Call Trace: [ 596.182427][ C0] ? set_next_entity+0x27c/0x440 [ 596.182435][ C0] psi_task_switch+0x2fb/0x400 [ 596.182438][ C0] __schedule+0xa1c/0x21e0 [ 596.182441][ C0] ? io_schedule_timeout+0x140/0x140 [ 596.182445][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 596.182448][ C0] schedule+0xd0/0x2a0 [ 596.182451][ C0] worker_thread+0x14c/0x1120 [ 596.182454][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 596.182458][ C0] ? process_one_work+0x1670/0x1670 [ 596.182461][ C0] kthread+0x3b5/0x4a0 [ 596.182464][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 596.182468][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 596.182471][ C0] ret_from_fork+0x1f/0x30 [ 596.182974][ T1171] Kernel panic - not syncing: hung_task: blocked tasks [ 596.392675][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 596.400538][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.410634][ T1171] Call Trace: [ 596.413920][ T1171] dump_stack+0x18f/0x20d [ 596.418233][ T1171] panic+0x2e3/0x75c [ 596.422108][ T1171] ? __warn_printk+0xf3/0xf3 [ 596.426710][ T1171] ? cpumask_next+0x3c/0x40 [ 596.431237][ T1171] ? printk_safe_flush+0xd6/0x120 [ 596.436322][ T1171] ? watchdog.cold+0x5/0x16b [ 596.440902][ T1171] ? watchdog+0xa82/0x1000 [ 596.445329][ T1171] watchdog.cold+0x16/0x16b [ 596.449813][ T1171] ? reset_hung_task_detector+0x30/0x30 [ 596.455348][ T1171] kthread+0x3b5/0x4a0 [ 596.459393][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.464480][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.469567][ T1171] ret_from_fork+0x1f/0x30 [ 596.475721][ T1171] Kernel Offset: disabled [ 596.480042][ T1171] Rebooting in 86400 seconds..