[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.539998][ T27] audit: type=1800 audit(1577375017.679:25): pid=9200 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 68.559902][ T27] audit: type=1800 audit(1577375017.679:26): pid=9200 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.581008][ T27] audit: type=1800 audit(1577375017.679:27): pid=9200 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.136' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 260.643425][ T74] attempt to access beyond end of device [ 260.649388][ T74] loop0: rw=1, want=707, limit=624 executing program executing program [ 260.745564][ T7] attempt to access beyond end of device [ 260.752877][ T7] loop0: rw=1, want=707, limit=624 executing program [ 260.832798][ T7] attempt to access beyond end of device [ 260.839408][ T7] loop0: rw=1, want=707, limit=624 [ 260.914618][ T74] attempt to access beyond end of device [ 260.925343][ T74] loop0: rw=1, want=707, limit=624 executing program [ 261.024436][ T74] attempt to access beyond end of device [ 261.030500][ T74] loop0: rw=1, want=707, limit=624 executing program [ 261.122451][ T7] attempt to access beyond end of device [ 261.128227][ T7] loop0: rw=1, want=707, limit=624 executing program [ 261.232956][ T74] attempt to access beyond end of device [ 261.239105][ T74] loop0: rw=1, want=707, limit=624 executing program [ 261.350899][ T74] attempt to access beyond end of device [ 261.356591][ T74] loop0: rw=1, want=707, limit=624 executing program executing program [ 261.447918][ T74] attempt to access beyond end of device [ 261.453795][ T74] loop0: rw=1, want=707, limit=624 [ 261.534095][ T74] attempt to access beyond end of device [ 261.540127][ T74] loop0: rw=1, want=707, limit=624 executing program [ 411.887267][ T1113] INFO: task syz-executor221:9352 blocked for more than 143 seconds. [ 411.895598][ T1113] Not tainted 5.5.0-rc3-syzkaller #0 [ 411.901982][ T1113] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 411.910721][ T1113] syz-executor221 D27256 9352 9350 0x00004000 [ 411.917107][ T1113] Call Trace: [ 411.920422][ T1113] __schedule+0x934/0x1f90 [ 411.924841][ T1113] ? __sched_text_start+0x8/0x8 [ 411.929735][ T1113] ? _raw_spin_unlock_irq+0x23/0x80 [ 411.934947][ T1113] ? wait_on_page_bit+0x23f/0xa60 [ 411.940063][ T1113] ? _raw_spin_unlock_irq+0x23/0x80 [ 411.945400][ T1113] schedule+0xdc/0x2b0 [ 411.949509][ T1113] io_schedule+0x1c/0x70 [ 411.953751][ T1113] wait_on_page_bit+0x27c/0xa60 [ 411.958662][ T1113] ? __lock_page_killable+0xb30/0xb30 [ 411.964044][ T1113] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 411.970294][ T1113] ? page_cache_prev_miss+0x340/0x340 [ 411.975708][ T1113] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 411.981378][ T1113] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 411.987399][ T1113] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 411.993629][ T1113] ? page_mapping+0x301/0x5c0 [ 411.998408][ T1113] wait_on_page_writeback+0x1b2/0x4f0 [ 412.003791][ T1113] __filemap_fdatawait_range+0x145/0x340 [ 412.009465][ T1113] ? add_page_wait_queue+0x260/0x260 [ 412.014751][ T1113] ? find_held_lock+0x35/0x130 [ 412.019570][ T1113] ? lock_downgrade+0x920/0x920 [ 412.024428][ T1113] filemap_fdatawait_keep_errors+0x22/0x30 [ 412.030289][ T1113] sync_inodes_sb+0x6e4/0xb50 [ 412.034979][ T1113] ? try_to_writeback_inodes_sb+0x70/0x70 [ 412.040758][ T1113] ? filemap_flush+0x24/0x30 [ 412.045352][ T1113] sync_filesystem+0x168/0x260 [ 412.050162][ T1113] generic_shutdown_super+0x75/0x370 [ 412.055451][ T1113] kill_block_super+0xa0/0x100 [ 412.060270][ T1113] deactivate_locked_super+0x95/0x100 [ 412.065688][ T1113] deactivate_super+0x1b2/0x1d0 [ 412.070634][ T1113] ? mount_bdev+0x3c0/0x3c0 [ 412.075144][ T1113] ? dput+0x38/0xe10 [ 412.079105][ T1113] ? dput+0x1ed/0xe10 [ 412.083098][ T1113] ? mnt_get_writers.isra.0+0xf9/0x150 [ 412.088803][ T1113] cleanup_mnt+0x351/0x4c0 [ 412.093234][ T1113] ? trace_hardirqs_on+0x67/0x240 [ 412.098384][ T1113] __cleanup_mnt+0x16/0x20 [ 412.102827][ T1113] task_work_run+0x145/0x1c0 [ 412.107482][ T1113] exit_to_usermode_loop+0x316/0x380 [ 412.112803][ T1113] do_syscall_64+0x676/0x790 [ 412.117454][ T1113] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 412.123354][ T1113] RIP: 0033:0x4487d7 [ 412.127293][ T1113] Code: Bad RIP value. [ 412.131369][ T1113] RSP: 002b:00007ffd80a6c6d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 [ 412.139925][ T1113] RAX: 0000000000000000 RBX: 000000000003fdba RCX: 00000000004487d7 [ 412.147953][ T1113] RDX: 0000000000400c50 RSI: 0000000000000002 RDI: 00007ffd80a6c780 [ 412.155910][ T1113] RBP: 00000000000024b2 R08: 0000000000000000 R09: 000000000000000a [ 412.163938][ T1113] R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffd80a6d7e0 [ 412.171942][ T1113] R13: 000000000226f940 R14: 0000000000000000 R15: 0000000000000000 [ 412.179973][ T1113] [ 412.179973][ T1113] Showing all locks held in the system: [ 412.187730][ T1113] 1 lock held by khungtaskd/1113: [ 412.192732][ T1113] #0: ffffffff899a5680 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 412.202116][ T1113] 1 lock held by rsyslogd/9238: [ 412.206955][ T1113] #0: ffff8880a3d68120 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 412.215626][ T1113] 2 locks held by getty/9328: [ 412.220376][ T1113] #0: ffff8880a89d3090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.229374][ T1113] #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.239013][ T1113] 2 locks held by getty/9329: [ 412.243709][ T1113] #0: ffff8880984fa090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.252733][ T1113] #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.262367][ T1113] 2 locks held by getty/9330: [ 412.267083][ T1113] #0: ffff88809f659090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.276039][ T1113] #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.285671][ T1113] 2 locks held by getty/9331: [ 412.290376][ T1113] #0: ffff888090379090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.299539][ T1113] #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.309165][ T1113] 2 locks held by getty/9332: [ 412.313838][ T1113] #0: ffff88809882c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.322863][ T1113] #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.332530][ T1113] 2 locks held by getty/9333: [ 412.337283][ T1113] #0: ffff888094fd5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.346252][ T1113] #1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.355881][ T1113] 2 locks held by getty/9334: [ 412.360687][ T1113] #0: ffff888099af1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 412.369706][ T1113] #1: ffffc900011512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 412.379354][ T1113] 2 locks held by syz-executor221/9352: [ 412.384877][ T1113] #0: ffff8880979960d8 (&type->s_umount_key#41){+.+.}, at: deactivate_super+0x1aa/0x1d0 [ 412.394820][ T1113] #1: ffff8880979968b8 (&s->s_sync_lock){+.+.}, at: sync_inodes_sb+0x246/0xb50 [ 412.403933][ T1113] [ 412.406248][ T1113] ============================================= [ 412.406248][ T1113] [ 412.414720][ T1113] NMI backtrace for cpu 0 [ 412.419112][ T1113] CPU: 0 PID: 1113 Comm: khungtaskd Not tainted 5.5.0-rc3-syzkaller #0 [ 412.427442][ T1113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 412.437513][ T1113] Call Trace: [ 412.440816][ T1113] dump_stack+0x197/0x210 [ 412.445146][ T1113] nmi_cpu_backtrace.cold+0x70/0xb2 [ 412.450332][ T1113] ? vprintk_func+0x86/0x189 [ 412.455026][ T1113] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 412.460659][ T1113] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 412.466627][ T1113] arch_trigger_cpumask_backtrace+0x14/0x20 [ 412.472551][ T1113] watchdog+0xb11/0x10c0 [ 412.476782][ T1113] kthread+0x361/0x430 [ 412.480837][ T1113] ? reset_hung_task_detector+0x30/0x30 [ 412.486364][ T1113] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 412.492072][ T1113] ret_from_fork+0x24/0x30 [ 412.496599][ T1113] Sending NMI from CPU 0 to CPUs 1: [ 412.502279][ C1] NMI backtrace for cpu 1 [ 412.502286][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc3-syzkaller #0 [ 412.502292][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 412.502296][ C1] RIP: 0010:lock_is_held_type+0x177/0x320 [ 412.502308][ C1] Code: b8 48 8d 83 98 08 00 00 45 31 ff 48 89 45 d0 48 b8 00 00 00 00 00 fc ff df 49 c1 ec 03 49 01 c4 8b 83 90 08 00 00 85 c0 7f 27 0d 01 00 00 41 0f b6 04 24 41 83 c7 01 84 c0 74 08 3c 03 0f 8e [ 412.502312][ C1] RSP: 0018:ffffc90000da8e18 EFLAGS: 00000046 [ 412.502320][ C1] RAX: 0000000000000000 RBX: ffff8880a99fa340 RCX: 0000000000000000 [ 412.502325][ C1] RDX: 1ffff1101533f57a RSI: 00000000ffffffff RDI: ffff8880a99fabd4 [ 412.502330][ C1] RBP: ffffc90000da8e60 R08: ffff8880a99fa340 R09: ffffed1015d2703d [ 412.502335][ C1] R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: ffffed101533f57a [ 412.502340][ C1] R13: 0000000000000001 R14: ffffffff899a5600 R15: 0000000000000000 [ 412.502346][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 412.502350][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 412.502355][ C1] CR2: 0000000001cc8000 CR3: 00000000a3d91000 CR4: 00000000001406e0 [ 412.502360][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 412.502365][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 412.502368][ C1] Call Trace: [ 412.502370][ C1] [ 412.502375][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 412.502378][ C1] rcu_read_lock_sched_held+0x9c/0xd0 [ 412.502383][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 412.502386][ C1] ? trace_hardirqs_on+0x67/0x240 [ 412.502389][ C1] __do_softirq+0x78f/0x98c [ 412.502392][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 412.502396][ C1] irq_exit+0x19b/0x1e0 [ 412.502399][ C1] scheduler_ipi+0x38c/0x610 [ 412.502403][ C1] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 412.502406][ C1] smp_reschedule_interrupt+0x78/0x4c0 [ 412.502410][ C1] reschedule_interrupt+0xf/0x20 [ 412.502412][ C1] [ 412.502416][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 412.502427][ C1] Code: 78 3b ea f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 54 cb 5f 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 44 cb 5f 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 3e 0f 9a f9 e8 79 [ 412.502431][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 [ 412.502440][ C1] RAX: 1ffffffff132669e RBX: ffff8880a99fa340 RCX: 0000000000000000 [ 412.502445][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fabd4 [ 412.502450][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fa340 R09: 0000000000000000 [ 412.502455][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 412.502460][ C1] R13: ffffffff8a799900 R14: 0000000000000000 R15: 0000000000000001 [ 412.502463][ C1] ? default_idle+0x4e/0x360 [ 412.502466][ C1] arch_cpu_idle+0xa/0x10 [ 412.502470][ C1] default_idle_call+0x84/0xb0 [ 412.502473][ C1] do_idle+0x3c8/0x6e0 [ 412.502476][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 412.502480][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 412.502488][ C1] ? complete+0x61/0x80 [ 412.502491][ C1] cpu_startup_entry+0x1b/0x20 [ 412.502495][ C1] start_secondary+0x2f4/0x410 [ 412.502498][ C1] ? set_cpu_sibling_map+0x2140/0x2140 [ 412.502502][ C1] secondary_startup_64+0xa4/0xb0 [ 412.502906][ T1113] Kernel panic - not syncing: hung_task: blocked tasks [ 412.833049][ T1113] CPU: 0 PID: 1113 Comm: khungtaskd Not tainted 5.5.0-rc3-syzkaller #0 [ 412.841265][ T1113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 412.851300][ T1113] Call Trace: [ 412.854594][ T1113] dump_stack+0x197/0x210 [ 412.858906][ T1113] panic+0x2e3/0x75c [ 412.862781][ T1113] ? add_taint.cold+0x16/0x16 [ 412.867444][ T1113] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 412.873057][ T1113] ? ___preempt_schedule+0x16/0x18 [ 412.878179][ T1113] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 412.884325][ T1113] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 412.890456][ T1113] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 412.896586][ T1113] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 412.902719][ T1113] watchdog+0xb22/0x10c0 [ 412.906960][ T1113] kthread+0x361/0x430 [ 412.911024][ T1113] ? reset_hung_task_detector+0x30/0x30 [ 412.916545][ T1113] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 412.922245][ T1113] ret_from_fork+0x24/0x30 [ 412.928162][ T1113] Kernel Offset: disabled [ 412.932494][ T1113] Rebooting in 86400 seconds..