[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 67.828408][ T27] audit: type=1800 audit(1577951581.025:25): pid=9318 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 67.848467][ T27] audit: type=1800 audit(1577951581.025:26): pid=9318 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 67.902792][ T27] audit: type=1800 audit(1577951581.035:27): pid=9318 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.204' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 281.064572][ T21] attempt to access beyond end of device
[ 281.073419][ T21] loop0: rw=1, want=707, limit=624
executing program
[ 281.166322][ T21] attempt to access beyond end of device
[ 281.172849][ T21] loop0: rw=1, want=707, limit=624
executing program
[ 432.207361][ T1116] INFO: task syz-executor311:9472 blocked for more than 143 seconds.
[ 432.215529][ T1116] Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
[ 432.222680][ T1116] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 432.231455][ T1116] syz-executor311 D26672 9472 9470 0x00004000
[ 432.237918][ T1116] Call Trace:
[ 432.241296][ T1116] __schedule+0x934/0x1f90
[ 432.245715][ T1116] ? firmware_map_remove+0x1a0/0x1a0
[ 432.251066][ T1116] ? _raw_spin_unlock_irq+0x23/0x80
[ 432.256312][ T1116] ? wait_on_page_bit+0x23f/0xa60
[ 432.261407][ T1116] ? _raw_spin_unlock_irq+0x23/0x80
[ 432.266636][ T1116] schedule+0xdc/0x2b0
[ 432.270768][ T1116] io_schedule+0x1c/0x70
[ 432.275026][ T1116] wait_on_page_bit+0x27c/0xa60
[ 432.279931][ T1116] ? __lock_page_killable+0xb30/0xb30
[ 432.285372][ T1116] ? rcu_lockdep_current_cpu_online+0xe3/0x130
[ 432.291579][ T1116] ? page_cache_prev_miss+0x340/0x340
[ 432.296967][ T1116] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 432.302559][ T1116] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 432.308657][ T1116] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[ 432.314911][ T1116] ? page_mapping+0x301/0x5c0
[ 432.319625][ T1116] wait_on_page_writeback+0x1b2/0x4f0
[ 432.324995][ T1116] __filemap_fdatawait_range+0x145/0x340
[ 432.330678][ T1116] ? add_page_wait_queue+0x260/0x260
[ 432.336003][ T1116] ? find_held_lock+0x35/0x130
[ 432.340844][ T1116] filemap_fdatawait_keep_errors+0x22/0x30
[ 432.346699][ T1116] sync_inodes_sb+0x6e4/0xb50
[ 432.351427][ T1116] ? try_to_writeback_inodes_sb+0x70/0x70
[ 432.357213][ T1116] ? filemap_flush+0x24/0x30
[ 432.361806][ T1116] sync_filesystem+0x168/0x260
[ 432.366628][ T1116] generic_shutdown_super+0x75/0x370
[ 432.371976][ T1116] kill_block_super+0xa0/0x100
[ 432.376737][ T1116] deactivate_locked_super+0x95/0x100
[ 432.382143][ T1116] deactivate_super+0x1bd/0x1e0
[ 432.387118][ T1116] ? iterate_supers_type+0x2b0/0x2b0
[ 432.392508][ T1116] ? dput+0x38/0xe10
[ 432.396406][ T1116] ? dput+0x1ed/0xe10
[ 432.400460][ T1116] ? mnt_get_writers.isra.0+0xf9/0x150
[ 432.405924][ T1116] cleanup_mnt+0x351/0x4c0
[ 432.410445][ T1116] ? trace_hardirqs_on+0x67/0x240
[ 432.415476][ T1116] __cleanup_mnt+0x16/0x20
[ 432.419955][ T1116] task_work_run+0x145/0x1c0
[ 432.424583][ T1116] exit_to_usermode_loop+0x316/0x380
[ 432.429927][ T1116] do_syscall_64+0x676/0x790
[ 432.434521][ T1116] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 432.440457][ T1116] RIP: 0033:0x4487d7
[ 432.444356][ T1116] Code: Bad RIP value.
[ 432.448456][ T1116] RSP: 002b:00007ffd80252528 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
[ 432.456878][ T1116] RAX: 0000000000000000 RBX: 0000000000044a73 RCX: 00000000004487d7
[ 432.464879][ T1116] RDX: 0000000000400c50 RSI: 0000000000000002 RDI: 00007ffd802525d0
[ 432.472898][ T1116] RBP: 0000000000002509 R08: 0000000000000000 R09: 0000000000000009
[ 432.480888][ T1116] R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffd80253630
[ 432.488907][ T1116] R13: 0000000000f59940 R14: 0000000000000000 R15: 0000000000000000
[ 432.496887][ T1116]
[ 432.496887][ T1116] Showing all locks held in the system:
[ 432.504641][ T1116] 1 lock held by khungtaskd/1116:
[ 432.509698][ T1116] #0: ffffffff899af980 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279
[ 432.519074][ T1116] 1 lock held by rsyslogd/9356:
[ 432.523915][ T1116] #0: ffff8880a462fde0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
[ 432.532562][ T1116] 2 locks held by getty/9446:
[ 432.537281][ T1116] #0: ffff888097195090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.546222][ T1116] #1: ffffc900016cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.555879][ T1116] 2 locks held by getty/9447:
[ 432.560582][ T1116] #0: ffff8880a89dd090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.569589][ T1116] #1: ffffc900016eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.579179][ T1116] 2 locks held by getty/9448:
[ 432.583830][ T1116] #0: ffff888093c24090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.592976][ T1116] #1: ffffc900016db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.602684][ T1116] 2 locks held by getty/9449:
[ 432.607403][ T1116] #0: ffff888095675090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.616379][ T1116] #1: ffffc900016fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.625983][ T1116] 2 locks held by getty/9450:
[ 432.630689][ T1116] #0: ffff8880a6d3e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.639677][ T1116] #1: ffffc9000170b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.649276][ T1116] 2 locks held by getty/9451:
[ 432.653944][ T1116] #0: ffff888094b7e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.662910][ T1116] #1: ffffc9000166b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.672535][ T1116] 2 locks held by getty/9452:
[ 432.677233][ T1116] #0: ffff888099570090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 432.686167][ T1116] #1: ffffc900011302e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[ 432.695757][ T1116] 2 locks held by syz-executor311/9472:
[ 432.701312][ T1116] #0: ffff8880a05d80d8 (&type->s_umount_key#41){+.+.}, at: deactivate_super+0x1b5/0x1e0
[ 432.711166][ T1116] #1: ffff8880a05d88b8 (&s->s_sync_lock){+.+.}, at: sync_inodes_sb+0x246/0xb50
[ 432.720253][ T1116]
[ 432.722571][ T1116] =============================================
[ 432.722571][ T1116]
[ 432.731030][ T1116] NMI backtrace for cpu 0
[ 432.735376][ T1116] CPU: 0 PID: 1116 Comm: khungtaskd Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
[ 432.744819][ T1116] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 432.754851][ T1116] Call Trace:
[ 432.758184][ T1116] dump_stack+0x197/0x210
[ 432.762508][ T1116] nmi_cpu_backtrace.cold+0x70/0xb2
[ 432.767724][ T1116] ? vprintk_func+0x86/0x189
[ 432.772330][ T1116] ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[ 432.777960][ T1116] nmi_trigger_cpumask_backtrace+0x23b/0x28b
[ 432.783922][ T1116] arch_trigger_cpumask_backtrace+0x14/0x20
[ 432.789798][ T1116] watchdog+0xdf1/0x14e0
[ 432.794065][ T1116] kthread+0x361/0x430
[ 432.798116][ T1116] ? reset_hung_task_detector+0x30/0x30
[ 432.803637][ T1116] ? kthread_mod_delayed_work+0x1f0/0x1f0
[ 432.809353][ T1116] ret_from_fork+0x24/0x30
[ 432.813882][ T1116] Sending NMI from CPU 0 to CPUs 1:
[ 432.819741][ C1] NMI backtrace for cpu 1
[ 432.819748][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
[ 432.819754][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 432.819758][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
[ 432.819770][ C1] Code: ff cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 a0 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 e4 c8 8c 7e 81 e2
[ 432.819774][ C1] RSP: 0018:ffffc90000da8cf0 EFLAGS: 00000006
[ 432.819782][ C1] RAX: ffff8880a99fa340 RBX: 0000000000000000 RCX: ffffffff817aed90
[ 432.819786][ C1] RDX: 0000000000000100 RSI: ffffffff817aedcc RDI: 0000000000000005
[ 432.819792][ C1] RBP: ffffc90000da8d28 R08: ffff8880a99fa340 R09: ffffed1015d26ead
[ 432.819797][ C1] R10: ffffed1015d26eac R11: ffff8880ae937563 R12: ffff8880ae937500
[ 432.819802][ C1] R13: ffffffff8153c3ee R14: ffffffff87cf768f R15: 0000000000000040
[ 432.819807][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
[ 432.819812][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 432.819817][ C1] CR2: 00007f31b908f000 CR3: 0000000093894000 CR4: 00000000001406e0
[ 432.819822][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 432.819826][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 432.819829][ C1] Call Trace:
[ 432.819831][ C1]
[ 432.819835][ C1] ? trace_hardirqs_off+0x59/0x240
[ 432.819838][ C1] _raw_spin_lock_irqsave+0x6f/0xcd
[ 432.819842][ C1] update_blocked_averages+0x4e/0x13d0
[ 432.819845][ C1] ? rcu_read_lock_held+0x9c/0xb0
[ 432.819849][ C1] ? tick_irq_enter+0xb5/0x3f0
[ 432.819852][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20
[ 432.819856][ C1] ? find_next_bit+0x107/0x130
[ 432.819859][ C1] _nohz_idle_balance+0x2e8/0x3f0
[ 432.819863][ C1] run_rebalance_domains+0x1c6/0x2d0
[ 432.819866][ C1] __do_softirq+0x262/0x98c
[ 432.819869][ C1] ? sched_clock_cpu+0x1b/0x1b0
[ 432.819872][ C1] irq_exit+0x19b/0x1e0
[ 432.819875][ C1] scheduler_ipi+0x3ae/0x640
[ 432.819879][ C1] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 432.819883][ C1] smp_reschedule_interrupt+0x78/0x4c0
[ 432.819886][ C1] reschedule_interrupt+0xf/0x20
[ 432.819889][ C1]
[ 432.819892][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 432.819903][ C1] Code: 78 e4 e3 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d b4 1b 59 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d a4 1b 59 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 2e 88 93 f9 e8 79
[ 432.819907][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
[ 432.819916][ C1] RAX: 1ffffffff13275ce RBX: ffff8880a99fa340 RCX: 0000000000000000
[ 432.819921][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fabdc
[ 432.819926][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fa340 R09: 0000000000000000
[ 432.819931][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[ 432.819936][ C1] R13: ffffffff8a816ac0 R14: 0000000000000000 R15: 0000000000000001
[ 432.819939][ C1] ? default_idle+0x4e/0x360
[ 432.819942][ C1] arch_cpu_idle+0xa/0x10
[ 432.819946][ C1] default_idle_call+0x84/0xb0
[ 432.819949][ C1] do_idle+0x3c8/0x6e0
[ 432.819952][ C1] ? arch_cpu_idle_exit+0x80/0x80
[ 432.819956][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0
[ 432.819959][ C1] ? complete+0x61/0x80
[ 432.819962][ C1] cpu_startup_entry+0x1b/0x20
[ 432.819966][ C1] start_secondary+0x2f4/0x410
[ 432.819969][ C1] ? set_cpu_sibling_map+0x2140/0x2140
[ 432.819973][ C1] secondary_startup_64+0xa4/0xb0
[ 432.820197][ T1116] Kernel panic - not syncing: hung_task: blocked tasks
[ 433.176845][ T1116] CPU: 0 PID: 1116 Comm: khungtaskd Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
[ 433.186274][ T1116] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 433.196318][ T1116] Call Trace:
[ 433.199598][ T1116] dump_stack+0x197/0x210
[ 433.204026][ T1116] panic+0x2e3/0x75c
[ 433.207934][ T1116] ? add_taint.cold+0x16/0x16
[ 433.212634][ T1116] ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[ 433.218257][ T1116] ? ___preempt_schedule+0x16/0x18
[ 433.223356][ T1116] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[ 433.229491][ T1116] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b
[ 433.235622][ T1116] ? nmi_trigger_cpumask_backtrace+0x256/0x28b
[ 433.241766][ T1116] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[ 433.247917][ T1116] watchdog+0xe02/0x14e0
[ 433.252142][ T1116] kthread+0x361/0x430
[ 433.256188][ T1116] ? reset_hung_task_detector+0x30/0x30
[ 433.261710][ T1116] ? kthread_mod_delayed_work+0x1f0/0x1f0
[ 433.267409][ T1116] ret_from_fork+0x24/0x30
[ 433.273424][ T1116] Kernel Offset: disabled
[ 433.277770][ T1116] Rebooting in 86400 seconds..