[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 636.791726][ T1167] INFO: task syz-executor550:6834 blocked for more than 143 seconds. [ 636.800007][ T1167] Not tainted 5.8.0-next-20200810-syzkaller #0 [ 636.807348][ T1167] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.816160][ T1167] syz-executor550 D28152 6834 6828 0x80000002 [ 636.823562][ T1167] Call Trace: [ 636.826957][ T1167] __schedule+0x8e5/0x21e0 [ 636.831378][ T1167] ? io_schedule_timeout+0x140/0x140 [ 636.836823][ T1167] ? io_wq_cancel_all+0x5a0/0x5a0 [ 636.841946][ T1167] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.847161][ T1167] schedule+0xd0/0x2a0 [ 636.851242][ T1167] io_uring_flush+0x740/0xa90 [ 636.856069][ T1167] ? io_req_task_cancel+0x20/0x20 [ 636.861113][ T1167] ? add_wait_queue_exclusive+0x180/0x180 [ 636.867890][ T1167] ? find_held_lock+0x2d/0x110 [ 636.872949][ T1167] ? lock_is_held_type+0xbb/0xf0 [ 636.877891][ T1167] ? io_req_task_cancel+0x20/0x20 [ 636.882993][ T1167] filp_close+0xb4/0x170 [ 636.887274][ T1167] put_files_struct+0x1cc/0x350 [ 636.892248][ T1167] exit_files+0x7e/0xa0 [ 636.896428][ T1167] do_exit+0xb43/0x29f0 [ 636.900568][ T1167] ? mm_update_next_owner+0x7a0/0x7a0 [ 636.906803][ T1167] ? io_submit_sqes+0x2380/0x2380 [ 636.912029][ T1167] ? __sys_socket+0x16d/0x200 [ 636.916727][ T1167] ? lock_is_held_type+0xbb/0xf0 [ 636.921910][ T1167] do_group_exit+0x125/0x310 [ 636.926539][ T1167] __x64_sys_exit_group+0x3a/0x50 [ 636.931676][ T1167] do_syscall_64+0x2d/0x70 [ 636.936101][ T1167] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 636.942674][ T1167] RIP: 0033:0x43f608 [ 636.949005][ T1167] Code: Bad RIP value. [ 636.953217][ T1167] RSP: 002b:00007fff2acd0f48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 636.961743][ T1167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f608 [ 636.969729][ T1167] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 636.977864][ T1167] RBP: 00000000004bee08 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 636.985932][ T1167] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 636.994055][ T1167] R13: 00000000006d11a0 R14: 0000000000000000 R15: 0000000000000000 [ 637.002134][ T1167] [ 637.002134][ T1167] Showing all locks held in the system: [ 637.009876][ T1167] 1 lock held by khungtaskd/1167: [ 637.015001][ T1167] #0: ffffffff89c66c40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.025003][ T1167] 1 lock held by in:imklog/6521: [ 637.029939][ T1167] #0: ffff8880949018b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.040650][ T1167] [ 637.043095][ T1167] ============================================= [ 637.043095][ T1167] [ 637.051625][ T1167] NMI backtrace for cpu 0 [ 637.055959][ T1167] CPU: 0 PID: 1167 Comm: khungtaskd Not tainted 5.8.0-next-20200810-syzkaller #0 [ 637.065133][ T1167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.075180][ T1167] Call Trace: [ 637.078459][ T1167] dump_stack+0x18f/0x20d [ 637.082786][ T1167] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.087990][ T1167] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.093616][ T1167] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.099586][ T1167] watchdog+0xd89/0xf30 [ 637.103751][ T1167] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.109984][ T1167] kthread+0x3b5/0x4a0 [ 637.114046][ T1167] ? __kthread_bind_mask+0xc0/0xc0 [ 637.119145][ T1167] ? __kthread_bind_mask+0xc0/0xc0 [ 637.124279][ T1167] ret_from_fork+0x1f/0x30 [ 637.128876][ T1167] Sending NMI from CPU 0 to CPUs 1: [ 637.135026][ C1] NMI backtrace for cpu 1 [ 637.135034][ C1] CPU: 1 PID: 3897 Comm: systemd-journal Not tainted 5.8.0-next-20200810-syzkaller #0 [ 637.135041][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.135046][ C1] RIP: 0010:__lock_acquire+0xb6/0x5640 [ 637.135058][ C1] Code: bc 24 e8 00 00 00 31 ff 48 c1 ea 03 0f b6 14 02 48 c7 c0 bc 50 bb 8a 83 e0 07 83 c0 03 65 4c 8b 34 25 c0 fe 01 00 38 d0 7c 08 <84> d2 0f 85 c8 13 00 00 8b 05 78 53 61 09 85 c0 0f 84 fa 0c 00 00 [ 637.135063][ C1] RSP: 0018:ffffc90001ac7758 EFLAGS: 00000002 [ 637.135073][ C1] RAX: 0000000000000007 RBX: ffffffff89c66c40 RCX: 1ffff92000358efd [ 637.135079][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 637.135085][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 637.135091][ C1] R10: fffffbfff15763c9 R11: 0000000000000001 R12: 0000000000000000 [ 637.135097][ C1] R13: 0000000000000000 R14: ffff888092e422c0 R15: 0000000000000002 [ 637.135103][ C1] FS: 00007fa07410a8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 637.135108][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.135114][ C1] CR2: 00007fa0714a9000 CR3: 0000000092d08000 CR4: 00000000001506e0 [ 637.135120][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.135126][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.135130][ C1] Call Trace: [ 637.135134][ C1] ? __lock_acquire+0x16cb/0x5640 [ 637.135139][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 637.135143][ C1] ? lock_is_held_type+0xbb/0xf0 [ 637.135148][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 637.135153][ C1] ? __d_lookup_rcu+0x370/0x6a0 [ 637.135157][ C1] lock_acquire+0x1f1/0xad0 [ 637.135162][ C1] ? __bpf_address_lookup+0x290/0x290 [ 637.135166][ C1] ? lock_release+0x8e0/0x8e0 [ 637.135171][ C1] ? arch_stack_walk+0x5e/0xf0 [ 637.135176][ C1] ? unwind_next_frame+0xe3b/0x1f90 [ 637.135181][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.135185][ C1] is_bpf_text_address+0x36/0x160 [ 637.135190][ C1] ? __bpf_address_lookup+0x290/0x290 [ 637.135195][ C1] kernel_text_address+0xbd/0xf0 [ 637.135200][ C1] __kernel_text_address+0x9/0x30 [ 637.135204][ C1] unwind_get_return_address+0x51/0x90 [ 637.135209][ C1] ? profile_setup.cold+0xc1/0xc1 [ 637.135214][ C1] arch_stack_walk+0x97/0xf0 [ 637.135218][ C1] ? putname+0xe1/0x120 [ 637.135222][ C1] stack_trace_save+0x8c/0xc0 [ 637.135227][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 637.135232][ C1] ? mark_lock+0xbc/0x1710 [ 637.135236][ C1] kasan_save_stack+0x1b/0x40 [ 637.135241][ C1] ? kasan_save_stack+0x1b/0x40 [ 637.135245][ C1] ? kasan_set_track+0x1c/0x30 [ 637.135250][ C1] ? kasan_set_free_info+0x1b/0x30 [ 637.135255][ C1] ? __kasan_slab_free+0xd8/0x120 [ 637.135260][ C1] ? kmem_cache_free.part.0+0x67/0x1f0 [ 637.135264][ C1] ? putname+0xe1/0x120 [ 637.135268][ C1] ? do_sys_openat2+0x153/0x420 [ 637.135273][ C1] ? __x64_sys_open+0x119/0x1c0 [ 637.135277][ C1] ? do_syscall_64+0x2d/0x70 [ 637.135283][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.135287][ C1] ? lock_acquire+0x1f1/0xad0 [ 637.135292][ C1] ? debug_check_no_obj_freed+0xc7/0x41c [ 637.135296][ C1] ? find_held_lock+0x2d/0x110 [ 637.135301][ C1] ? debug_check_no_obj_freed+0x20c/0x41c [ 637.135306][ C1] ? lock_downgrade+0x830/0x830 [ 637.135311][ C1] ? lock_acquire+0x1f1/0xad0 [ 637.135315][ C1] ? put_unused_fd+0x4b/0x70 [ 637.135320][ C1] ? lockdep_hardirqs_off+0x89/0xc0 [ 637.135324][ C1] ? trace_hardirqs_off+0x27/0x210 [ 637.135329][ C1] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 637.135334][ C1] ? debug_check_no_obj_freed+0x20c/0x41c [ 637.135339][ C1] kasan_set_track+0x1c/0x30 [ 637.135343][ C1] kasan_set_free_info+0x1b/0x30 [ 637.135348][ C1] __kasan_slab_free+0xd8/0x120 [ 637.135352][ C1] ? putname+0xe1/0x120 [ 637.135357][ C1] kmem_cache_free.part.0+0x67/0x1f0 [ 637.135361][ C1] putname+0xe1/0x120 [ 637.135365][ C1] do_sys_openat2+0x153/0x420 [ 637.135370][ C1] ? seccomp_notify_ioctl+0xd90/0xd90 [ 637.135375][ C1] ? strncpy_from_user+0x2bf/0x3e0 [ 637.135379][ C1] ? build_open_flags+0x650/0x650 [ 637.135383][ C1] ? getname_flags.part.0+0x1dd/0x4f0 [ 637.135387][ C1] __x64_sys_open+0x119/0x1c0 [ 637.135390][ C1] ? do_sys_open+0x140/0x140 [ 637.135394][ C1] ? __secure_computing+0x104/0x360 [ 637.135397][ C1] do_syscall_64+0x2d/0x70 [ 637.135402][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.135405][ C1] RIP: 0033:0x7fa07369a840 [ 637.135418][ 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 [ 637.135423][ C1] RSP: 002b:00007fff0f75fec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 637.135433][ C1] RAX: ffffffffffffffda RBX: 00007fff0f7601d0 RCX: 00007fa07369a840 [ 637.135437][ C1] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005580aa30df80 [ 637.135440][ C1] RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff [ 637.135444][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 637.135448][ C1] R13: 00005580aa300040 R14: 00007fff0f760190 R15: 00005580aa30dfd0 [ 637.135520][ T1167] Kernel panic - not syncing: hung_task: blocked tasks [ 637.652774][ T1167] CPU: 0 PID: 1167 Comm: khungtaskd Not tainted 5.8.0-next-20200810-syzkaller #0 [ 637.661877][ T1167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.671937][ T1167] Call Trace: [ 637.675225][ T1167] dump_stack+0x18f/0x20d [ 637.679547][ T1167] panic+0x2e3/0x75c [ 637.683446][ T1167] ? __warn_printk+0xf3/0xf3 [ 637.688034][ T1167] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.693668][ T1167] ? preempt_schedule_thunk+0x16/0x18 [ 637.699059][ T1167] ? watchdog.cold+0x22d/0x24b [ 637.703810][ T1167] ? watchdog+0xc59/0xf30 [ 637.708136][ T1167] watchdog.cold+0x23e/0x24b [ 637.712711][ T1167] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.718432][ T1167] kthread+0x3b5/0x4a0 [ 637.722488][ T1167] ? __kthread_bind_mask+0xc0/0xc0 [ 637.727585][ T1167] ? __kthread_bind_mask+0xc0/0xc0 [ 637.732686][ T1167] ret_from_fork+0x1f/0x30 [ 637.738387][ T1167] Kernel Offset: disabled [ 637.742765][ T1167] Rebooting in 86400 seconds..