[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 636.929959][ T1165] INFO: task syz-executor389:6870 blocked for more than 143 seconds. [ 636.929981][ T1165] Not tainted 5.9.0-rc1-syzkaller #0 [ 636.944568][ T1165] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.953526][ T1165] task:syz-executor389 state:D stack:28096 pid: 6870 ppid: 6864 flags:0xa0020002 [ 636.962840][ T1165] Call Trace: [ 636.966335][ T1165] __schedule+0x8e5/0x21e0 [ 636.970939][ T1165] ? io_schedule_timeout+0x140/0x140 [ 636.976324][ T1165] ? do_raw_spin_lock+0x120/0x2b0 [ 636.981409][ T1165] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.986726][ T1165] schedule+0xd0/0x2a0 [ 636.990981][ T1165] io_uring_flush+0x759/0xe60 [ 636.995668][ T1165] ? io_req_task_cancel+0x20/0x20 [ 637.000941][ T1165] ? add_wait_queue_exclusive+0x180/0x180 [ 637.006682][ T1165] ? find_held_lock+0x2d/0x110 [ 637.011597][ T1165] ? lock_is_held_type+0xbb/0xf0 [ 637.016668][ T1165] ? io_req_task_cancel+0x20/0x20 [ 637.021872][ T1165] filp_close+0xb4/0x170 [ 637.026201][ T1165] put_files_struct+0x1cc/0x350 [ 637.031147][ T1165] exit_files+0x7e/0xa0 [ 637.035395][ T1165] do_exit+0xb43/0x29f0 [ 637.039558][ T1165] ? mm_update_next_owner+0x7a0/0x7a0 [ 637.045009][ T1165] ? io_submit_sqes+0x2380/0x2380 [ 637.050296][ T1165] ? __sys_socket+0x16d/0x200 [ 637.054967][ T1165] ? lock_is_held_type+0xbb/0xf0 [ 637.059955][ T1165] do_group_exit+0x125/0x310 [ 637.064547][ T1165] __ia32_sys_exit_group+0x3a/0x50 [ 637.069838][ T1165] __do_fast_syscall_32+0x57/0x80 [ 637.074868][ T1165] do_fast_syscall_32+0x2f/0x70 [ 637.079787][ T1165] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 637.086149][ T1165] RIP: 0023:0xf7f1d549 [ 637.090289][ T1165] Code: Bad RIP value. [ 637.094347][ T1165] RSP: 002b:00000000ff86a61c EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 637.102833][ T1165] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080ec2d8 [ 637.110896][ T1165] RDX: 0000000000000000 RSI: 00000000080d62b8 RDI: 00000000080ec2e0 [ 637.118859][ T1165] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 637.126890][ T1165] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 637.135045][ T1165] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 637.143090][ T1165] [ 637.143090][ T1165] Showing all locks held in the system: [ 637.150909][ T1165] 1 lock held by khungtaskd/1165: [ 637.155919][ T1165] #0: ffffffff89bd6340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.165815][ T1165] 2 locks held by in:imklog/6755: [ 637.170909][ T1165] #0: ffff8880a2956af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.180063][ T1165] #1: ffffffff89c85480 (fs_reclaim){+.+.}-{0:0}, at: cache_grow_end+0x46/0x170 [ 637.189184][ T1165] [ 637.191582][ T1165] ============================================= [ 637.191582][ T1165] [ 637.200052][ T1165] NMI backtrace for cpu 1 [ 637.204473][ T1165] CPU: 1 PID: 1165 Comm: khungtaskd Not tainted 5.9.0-rc1-syzkaller #0 [ 637.212688][ T1165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.222741][ T1165] Call Trace: [ 637.226102][ T1165] dump_stack+0x18f/0x20d [ 637.230442][ T1165] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.235797][ T1165] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.241430][ T1165] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.247443][ T1165] watchdog+0xd7d/0x1000 [ 637.251669][ T1165] ? reset_hung_task_detector+0x30/0x30 [ 637.257246][ T1165] kthread+0x3b5/0x4a0 [ 637.261297][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 637.266556][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 637.271720][ T1165] ret_from_fork+0x1f/0x30 [ 637.276257][ T1165] Sending NMI from CPU 1 to CPUs 0: [ 637.281849][ C0] NMI backtrace for cpu 0 [ 637.281856][ C0] CPU: 0 PID: 3902 Comm: systemd-journal Not tainted 5.9.0-rc1-syzkaller #0 [ 637.281862][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.281866][ C0] RIP: 0010:fs_reclaim_acquire+0x1/0xf0 [ 637.281877][ C0] Code: 00 08 00 75 07 a9 00 00 04 00 74 8e 5b 5d c3 e8 b5 49 09 00 e9 77 ff ff ff e8 ab 49 09 00 eb b7 66 0f 1f 84 00 00 00 00 00 55 <65> 48 8b 04 25 c0 fe 01 00 48 89 e5 41 56 49 89 c6 53 89 fb 48 8d [ 637.281881][ C0] RSP: 0018:ffffc900053afd88 EFLAGS: 00000206 [ 637.281888][ C0] RAX: 0000000000000000 RBX: ffffc900053afdd8 RCX: 0000000000000cc0 [ 637.281893][ C0] RDX: 0000000000000001 RSI: ffffc900053afdd8 RDI: 0000000000000cc0 [ 637.281898][ C0] RBP: 0000000000000cc0 R08: 0000000000000001 R09: 0000000000000001 [ 637.281903][ C0] R10: 000000007fff0000 R11: 0000000000000000 R12: ffff88821bc47a00 [ 637.281909][ C0] R13: 0000000000000001 R14: ffff88821bc47a00 R15: ffffffff8ab24948 [ 637.281914][ C0] FS: 00007fe1d218d8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 637.281919][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.281924][ C0] CR2: 00007fe1cf52b008 CR3: 00000000938f9000 CR4: 00000000001506f0 [ 637.281929][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.281934][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.281936][ C0] Call Trace: [ 637.281940][ C0] slab_pre_alloc_hook.constprop.0+0x20/0x1f0 [ 637.281943][ C0] kmem_cache_alloc+0x46/0x3a0 [ 637.281947][ C0] ? seccomp_notify_ioctl+0xd90/0xd90 [ 637.281950][ C0] getname_flags.part.0+0x50/0x4f0 [ 637.281954][ C0] getname_flags+0x9a/0xe0 [ 637.281957][ C0] do_mkdirat+0x8d/0x2d0 [ 637.281960][ C0] ? user_path_create+0xf0/0xf0 [ 637.281963][ C0] ? __secure_computing+0x104/0x360 [ 637.281967][ C0] do_syscall_64+0x2d/0x70 [ 637.281971][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.281974][ C0] RIP: 0033:0x7fe1d1449687 [ 637.281985][ C0] Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 [ 637.281989][ C0] RSP: 002b:00007ffcade3f8f8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 637.281998][ C0] RAX: ffffffffffffffda RBX: 00007ffcade42960 RCX: 00007fe1d1449687 [ 637.282003][ C0] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000556bf67218a0 [ 637.282008][ C0] RBP: 00007ffcade3f930 R08: 0000556bf497d3e5 R09: 0000000000000018 [ 637.282013][ C0] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 637.282018][ C0] R13: 0000000000000001 R14: 0000556bf67218a0 R15: 00007ffcade3ff70 [ 637.282510][ T1165] Kernel panic - not syncing: hung_task: blocked tasks [ 637.551102][ T1165] CPU: 1 PID: 1165 Comm: khungtaskd Not tainted 5.9.0-rc1-syzkaller #0 [ 637.559321][ T1165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.569418][ T1165] Call Trace: [ 637.572693][ T1165] dump_stack+0x18f/0x20d [ 637.577079][ T1165] panic+0x2e3/0x75c [ 637.580956][ T1165] ? __warn_printk+0xf3/0xf3 [ 637.585526][ T1165] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.591135][ T1165] ? preempt_schedule_thunk+0x16/0x18 [ 637.596510][ T1165] ? watchdog.cold+0x5/0x16b [ 637.601075][ T1165] ? watchdog+0xa82/0x1000 [ 637.605475][ T1165] watchdog.cold+0x16/0x16b [ 637.609976][ T1165] ? reset_hung_task_detector+0x30/0x30 [ 637.615497][ T1165] kthread+0x3b5/0x4a0 [ 637.619542][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 637.624649][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 637.629757][ T1165] ret_from_fork+0x1f/0x30 [ 637.635844][ T1165] Kernel Offset: disabled [ 637.640176][ T1165] Rebooting in 86400 seconds..