[ 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 '10.128.0.171' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 636.880940][ T1166] INFO: task syz-executor543:12078 blocked for more than 143 seconds. [ 636.889356][ T1166] Not tainted 5.8.0-syzkaller #0 [ 636.896676][ T1166] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.905803][ T1166] syz-executor543 D28360 12078 6845 0x80000000 [ 636.912328][ T1166] Call Trace: [ 636.915749][ T1166] __schedule+0x8e5/0x21e0 [ 636.920179][ T1166] ? io_schedule_timeout+0x140/0x140 [ 636.925721][ T1166] ? io_wq_cancel_all+0x5a0/0x5a0 [ 636.930869][ T1166] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.936076][ T1166] schedule+0xd0/0x2a0 [ 636.940214][ T1166] io_uring_flush+0x740/0xa90 [ 636.945164][ T1166] ? mm_update_next_owner+0x100/0x7a0 [ 636.950563][ T1166] ? io_req_task_cancel+0x20/0x20 [ 636.956170][ T1166] ? add_wait_queue_exclusive+0x180/0x180 [ 636.962094][ T1166] ? find_held_lock+0x2d/0x110 [ 636.966943][ T1166] ? lock_is_held_type+0xbb/0xf0 [ 636.971965][ T1166] ? io_req_task_cancel+0x20/0x20 [ 636.977081][ T1166] filp_close+0xb4/0x170 [ 636.981500][ T1166] put_files_struct+0x1cc/0x350 [ 636.986371][ T1166] exit_files+0x7e/0xa0 [ 636.990532][ T1166] do_exit+0xb43/0x29f0 [ 636.994814][ T1166] ? _down_write_nest_lock+0x150/0x150 [ 637.000298][ T1166] ? mm_update_next_owner+0x7a0/0x7a0 [ 637.005807][ T1166] ? lock_is_held_type+0xbb/0xf0 [ 637.011305][ T1166] do_group_exit+0x125/0x310 [ 637.015911][ T1166] __x64_sys_exit_group+0x3a/0x50 [ 637.021086][ T1166] do_syscall_64+0x2d/0x70 [ 637.025611][ T1166] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.031646][ T1166] RIP: 0033:0x440938 [ 637.035593][ T1166] Code: Bad RIP value. [ 637.039666][ T1166] RSP: 002b:00007ffcbb702cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 637.048243][ T1166] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440938 [ 637.056383][ T1166] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 637.064497][ T1166] RBP: 00000000004c01d0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 637.072744][ T1166] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 637.080825][ T1166] R13: 00000000006d21a0 R14: 0000000000000000 R15: 0000000000000000 [ 637.088866][ T1166] [ 637.088866][ T1166] Showing all locks held in the system: [ 637.096706][ T1166] 1 lock held by khungtaskd/1166: [ 637.101823][ T1166] #0: ffffffff89bd62c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.111765][ T1166] 2 locks held by in:imklog/6527: [ 637.116792][ T1166] #0: ffff8880a745cd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.126100][ T1166] #1: ffffffff89bcad38 (logbuf_lock){-.-.}-{2:2}, at: is_bpf_text_address+0x0/0x160 [ 637.135814][ T1166] [ 637.138157][ T1166] ============================================= [ 637.138157][ T1166] [ 637.147439][ T1166] NMI backtrace for cpu 0 [ 637.151911][ T1166] CPU: 0 PID: 1166 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 637.159813][ T1166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.169868][ T1166] Call Trace: [ 637.173230][ T1166] dump_stack+0x18f/0x20d [ 637.177567][ T1166] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.182851][ T1166] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.188482][ T1166] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.194548][ T1166] watchdog+0xd7d/0x1000 [ 637.198785][ T1166] ? reset_hung_task_detector+0x30/0x30 [ 637.204392][ T1166] kthread+0x3b5/0x4a0 [ 637.208466][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 637.213565][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 637.218729][ T1166] ret_from_fork+0x1f/0x30 [ 637.223261][ T1166] Sending NMI from CPU 0 to CPUs 1: [ 637.229283][ C1] NMI backtrace for cpu 1 [ 637.229290][ C1] CPU: 1 PID: 3900 Comm: systemd-journal Not tainted 5.8.0-syzkaller #0 [ 637.229296][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.229300][ C1] RIP: 0010:in_task_stack+0x0/0x40 [ 637.229311][ C1] Code: e6 ea 8a 00 e9 1d ff ff ff e8 dc ea 8a 00 e9 db fe ff ff e8 d2 ea 8a 00 e9 52 ff ff ff e8 c8 ea 8a 00 e9 74 ff ff ff cc cc cc <48> 8b 46 18 48 8d 88 00 80 00 00 48 39 f8 77 21 48 39 f9 76 1c 48 [ 637.229315][ C1] RSP: 0018:ffffc900010f7918 EFLAGS: 00000282 [ 637.229323][ C1] RAX: dffffc0000000000 RBX: ffffc900010f7998 RCX: ffffc900010f79b8 [ 637.229328][ C1] RDX: ffffc900010f7998 RSI: ffff8880937c6340 RDI: ffffc900010f7948 [ 637.229333][ C1] RBP: ffffc900010f7948 R08: 0000000000000001 R09: ffffc900010f7998 [ 637.229338][ C1] R10: fffff5200021ef3e R11: 0000000000000000 R12: ffffc900010f79b8 [ 637.229343][ C1] R13: ffff8880937c6340 R14: ffffc900010f79d0 R15: ffffc900010f7998 [ 637.229349][ C1] FS: 00007f9bf72778c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 637.229353][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.229358][ C1] CR2: 00007f9bf4614000 CR3: 0000000093da4000 CR4: 00000000001506e0 [ 637.229363][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.229369][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.229371][ C1] Call Trace: [ 637.229375][ C1] get_stack_info+0x32/0x154 [ 637.229378][ C1] __unwind_start+0x4aa/0x800 [ 637.229382][ C1] ? profile_setup.cold+0xc1/0xc1 [ 637.229386][ C1] arch_stack_walk+0x5e/0xf0 [ 637.229389][ C1] ? __unwind_start+0x592/0x800 [ 637.229393][ C1] stack_trace_save+0x8c/0xc0 [ 637.229397][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 637.229400][ C1] kasan_save_stack+0x1b/0x40 [ 637.229405][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 637.229408][ C1] ? lockdep_hardirqs_off+0x89/0xc0 [ 637.229412][ C1] ? __zone_watermark_ok+0x3f0/0x3f0 [ 637.229416][ C1] ? lock_acquire+0x1f1/0xad0 [ 637.229419][ C1] ? cache_grow_end+0x46/0x170 [ 637.229423][ C1] ? find_held_lock+0x2d/0x110 [ 637.229427][ C1] ? cache_alloc_refill+0x2fd/0x340 [ 637.229430][ C1] ? lock_downgrade+0x830/0x830 [ 637.229434][ C1] ? do_raw_spin_unlock+0x171/0x230 [ 637.229438][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 637.229442][ C1] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 637.229446][ C1] kmem_cache_alloc+0x138/0x3a0 [ 637.229450][ C1] getname_flags.part.0+0x50/0x4f0 [ 637.229454][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 637.229457][ C1] getname+0x8e/0xd0 [ 637.229460][ C1] do_sys_openat2+0xf5/0x420 [ 637.229464][ C1] ? seccomp_notify_ioctl+0xd90/0xd90 [ 637.229468][ C1] ? strncpy_from_user+0x2bf/0x3e0 [ 637.229472][ C1] ? build_open_flags+0x650/0x650 [ 637.229475][ C1] ? getname_flags.part.0+0x1dd/0x4f0 [ 637.229479][ C1] __x64_sys_open+0x119/0x1c0 [ 637.229483][ C1] ? do_sys_open+0x140/0x140 [ 637.229487][ C1] ? __secure_computing+0x104/0x360 [ 637.229490][ C1] do_syscall_64+0x2d/0x70 [ 637.229495][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.229499][ C1] RIP: 0033:0x7f9bf6807840 [ 637.229510][ C1] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 637.229514][ C1] RSP: 002b:00007ffe750ed558 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 637.229524][ C1] RAX: ffffffffffffffda RBX: 00007ffe750ed860 RCX: 00007f9bf6807840 [ 637.229529][ C1] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055b1b9822290 [ 637.229535][ C1] RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff [ 637.229540][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 637.229546][ C1] R13: 000055b1b9817040 R14: 00007ffe750ed820 R15: 000055b1b9824010 [ 637.229562][ T1166] Kernel panic - not syncing: hung_task: blocked tasks [ 637.609563][ T1166] CPU: 0 PID: 1166 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 637.617431][ T1166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.627484][ T1166] Call Trace: [ 637.630766][ T1166] dump_stack+0x18f/0x20d [ 637.635088][ T1166] panic+0x2e3/0x75c [ 637.638968][ T1166] ? __warn_printk+0xf3/0xf3 [ 637.643538][ T1166] ? cpumask_next+0x3c/0x40 [ 637.648122][ T1166] ? printk_safe_flush+0xd6/0x120 [ 637.653133][ T1166] ? watchdog.cold+0x5/0x16b [ 637.657714][ T1166] ? watchdog+0xa82/0x1000 [ 637.662113][ T1166] watchdog.cold+0x16/0x16b [ 637.666613][ T1166] ? reset_hung_task_detector+0x30/0x30 [ 637.672147][ T1166] kthread+0x3b5/0x4a0 [ 637.676213][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 637.681306][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 637.686407][ T1166] ret_from_fork+0x1f/0x30 [ 637.691957][ T1166] Kernel Offset: disabled [ 637.696295][ T1166] Rebooting in 86400 seconds..