[ 57.981629][ T26] audit: type=1800 audit(1572450726.752:25): pid=8688 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.027248][ T26] audit: type=1800 audit(1572450726.752:26): pid=8688 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.070566][ T26] audit: type=1800 audit(1572450726.752:27): pid=8688 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. [ 58.736948][ T8753] sshd (8753) used greatest stack depth: 22888 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. syzkaller login: [ 217.180655][ T1079] INFO: task khugepaged:1086 blocked for more than 143 seconds. [ 217.188474][ T1079] Not tainted 5.4.0-rc5-next-20191030 #0 [ 217.194699][ T1079] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 217.203733][ T1079] khugepaged D27840 1086 2 0x80004000 [ 217.210176][ T1079] Call Trace: [ 217.213676][ T1079] __schedule+0x94a/0x1e70 [ 217.218417][ T1079] ? __sched_text_start+0x8/0x8 [ 217.223558][ T1079] ? blk_insert_cloned_request+0x530/0x530 [ 217.229490][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 217.234765][ T1079] ? __lock_page+0x3d9/0xab0 [ 217.239377][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 217.244920][ T1079] schedule+0xdc/0x2b0 [ 217.249019][ T1079] io_schedule+0x1c/0x70 [ 217.253318][ T1079] __lock_page+0x422/0xab0 [ 217.257938][ T1079] ? wait_on_page_bit+0xa60/0xa60 [ 217.263068][ T1079] ? page_cache_next_miss+0x340/0x340 [ 217.268446][ T1079] ? ___might_sleep+0x163/0x2c0 [ 217.274087][ T1079] ? __might_sleep+0x95/0x190 [ 217.279058][ T1079] mpage_prepare_extent_to_map+0xb3f/0xf90 [ 217.285011][ T1079] ? mpage_process_page_bufs+0x780/0x780 [ 217.290750][ T1079] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 217.296755][ T1079] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 217.303103][ T1079] ext4_writepages+0xb6a/0x2e70 [ 217.308094][ T1079] ? retint_kernel+0x2b/0x2b [ 217.313003][ T1079] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 217.318672][ T1079] ? 0xffffffff81000000 [ 217.323194][ T1079] ? mark_lock+0xc2/0x1220 [ 217.328106][ T1079] ? prep_new_page+0x19f/0x200 [ 217.333494][ T1079] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 217.339498][ T1079] ? find_held_lock+0x35/0x130 [ 217.344363][ T1079] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 217.350360][ T1079] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 217.357064][ T1079] do_writepages+0xfa/0x2a0 [ 217.361842][ T1079] ? do_writepages+0xfa/0x2a0 [ 217.367802][ T1079] ? lock_downgrade+0x920/0x920 [ 217.372725][ T1079] ? page_writeback_cpu_online+0x20/0x20 [ 217.378462][ T1079] ? __kasan_check_read+0x11/0x20 [ 217.384621][ T1079] ? do_raw_spin_unlock+0x57/0x270 [ 217.390751][ T1079] ? _raw_spin_unlock+0x28/0x40 [ 217.395704][ T1079] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 217.403117][ T1079] ? wbc_attach_and_unlock_inode+0x5bf/0x920 [ 217.409229][ T1079] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 217.415053][ T1079] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 217.421330][ T1079] ? lockdep_hardirqs_on+0x421/0x5e0 [ 217.427713][ T1079] filemap_flush+0x24/0x30 [ 217.432205][ T1079] collapse_file+0x36b1/0x41a0 [ 217.437099][ T1079] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 217.443379][ T1079] ? khugepaged+0x2230/0x4360 [ 217.448697][ T1079] ? trace_event_raw_event_mm_collapse_huge_page_isolate+0x370/0x370 [ 217.456834][ T1079] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 217.462614][ T1079] ? khugepaged_find_target_node+0x142/0x180 [ 217.468638][ T1079] khugepaged+0x2da9/0x4360 [ 217.473653][ T1079] ? __kasan_check_read+0x11/0x20 [ 217.479399][ T1079] ? __lock_acquire+0x16f2/0x4a00 [ 217.484643][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 217.489867][ T1079] ? finish_task_switch+0x147/0x750 [ 217.495136][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 217.500353][ T1079] ? lockdep_hardirqs_on+0x421/0x5e0 [ 217.506639][ T1079] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 217.512353][ T1079] ? lock_downgrade+0x920/0x920 [ 217.517354][ T1079] ? finish_wait+0x260/0x260 [ 217.522044][ T1079] ? lockdep_hardirqs_on+0x421/0x5e0 [ 217.527596][ T1079] ? trace_hardirqs_on+0x67/0x240 [ 217.533568][ T1079] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 217.540037][ T1079] ? __kthread_parkme+0x108/0x1c0 [ 217.545272][ T1079] ? __kasan_check_read+0x11/0x20 [ 217.550328][ T1079] kthread+0x361/0x430 [ 217.554475][ T1079] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 217.560142][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 217.565979][ T1079] ret_from_fork+0x24/0x30 [ 217.570773][ T1079] [ 217.570773][ T1079] Showing all locks held in the system: [ 217.578793][ T1079] 4 locks held by kworker/u4:5/467: [ 217.584168][ T1079] #0: ffff8880a837b528 ((wq_completion)writeback){+.+.}, at: process_one_work+0x88b/0x1740 [ 217.594573][ T1079] #1: ffff8880a8427dc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x8c1/0x1740 [ 217.606081][ T1079] #2: ffff8882163be0d8 (&type->s_umount_key#32){++++}, at: trylock_super+0x22/0x110 [ 217.615748][ T1079] #3: ffff8882163c0990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 217.625916][ T1079] 1 lock held by khungtaskd/1079: [ 217.631365][ T1079] #0: ffffffff88faba40 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 217.640867][ T1079] 1 lock held by khugepaged/1086: [ 217.645910][ T1079] #0: ffff8882163c0990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 217.655957][ T1079] 1 lock held by rsyslogd/8726: [ 217.661909][ T1079] #0: ffff888099d85420 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 217.670707][ T1079] 2 locks held by getty/8816: [ 217.675394][ T1079] #0: ffff8880a16b5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.684620][ T1079] #1: ffffc90005f4b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.694391][ T1079] 2 locks held by getty/8817: [ 217.699158][ T1079] #0: ffff8880a60ce090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.708211][ T1079] #1: ffffc90005f632e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.718263][ T1079] 2 locks held by getty/8818: [ 217.723580][ T1079] #0: ffff88808f94e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.732808][ T1079] #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.742633][ T1079] 2 locks held by getty/8819: [ 217.747321][ T1079] #0: ffff888098474090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.756356][ T1079] #1: ffffc90005f5f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.766108][ T1079] 2 locks held by getty/8820: [ 217.770867][ T1079] #0: ffff88809aee5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.779940][ T1079] #1: ffffc90005f5b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.789702][ T1079] 2 locks held by getty/8821: [ 217.795326][ T1079] #0: ffff8880a92b1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.804382][ T1079] #1: ffffc90005f572e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.814214][ T1079] 2 locks held by getty/8822: [ 217.818971][ T1079] #0: ffff8880a4b20090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 217.828094][ T1079] #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 217.838200][ T1079] 1 lock held by syz-execprog/8842: [ 217.843619][ T1079] #0: ffff8880a336f3a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 [ 217.853054][ T1079] [ 217.855392][ T1079] ============================================= [ 217.855392][ T1079] [ 217.864027][ T1079] NMI backtrace for cpu 0 [ 217.868583][ T1079] CPU: 0 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191030 #0 [ 217.877598][ T1079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 217.887779][ T1079] Call Trace: [ 217.891159][ T1079] dump_stack+0x172/0x1f0 [ 217.895569][ T1079] nmi_cpu_backtrace.cold+0x70/0xb2 [ 217.900767][ T1079] ? vprintk_func+0x86/0x189 [ 217.905796][ T1079] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 217.911877][ T1079] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 217.918003][ T1079] arch_trigger_cpumask_backtrace+0x14/0x20 [ 217.924000][ T1079] watchdog+0xc8f/0x1350 [ 217.928249][ T1079] kthread+0x361/0x430 [ 217.932317][ T1079] ? reset_hung_task_detector+0x30/0x30 [ 217.937886][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 217.944050][ T1079] ret_from_fork+0x24/0x30 [ 217.948598][ T1079] Sending NMI from CPU 0 to CPUs 1: [ 217.954407][ C1] NMI backtrace for cpu 1 [ 217.954413][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc5-next-20191030 #0 [ 217.954418][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 217.954422][ C1] RIP: 0010:find_busiest_group+0x2a2/0x31b0 [ 217.954431][ C1] Code: ff 0f b6 00 38 85 fb fd ff ff 7c 08 84 c0 0f 85 06 29 00 00 48 8b 85 e8 fd ff ff 41 8b 77 14 42 80 3c 20 00 0f 85 01 29 00 00 <49> 8b 3f 49 8d 9e 58 ff ff ff e8 2f f4 ff ff 31 f6 ba 48 00 00 00 [ 217.954435][ C1] RSP: 0018:ffff8880ae909880 EFLAGS: 00000246 [ 217.954442][ C1] RAX: 1ffff11015d21386 RBX: 0000000000000001 RCX: ffffffff8153d4cd [ 217.954446][ C1] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880a981c420 [ 217.954451][ C1] RBP: ffff8880ae909b20 R08: 1ffff11015303884 R09: ffffed1015303885 [ 217.954455][ C1] R10: ffffed1015303884 R11: ffff8880a981c427 R12: dffffc0000000000 [ 217.954460][ C1] R13: ffff8880a981c420 R14: ffff8880ae909af8 R15: ffff8880ae909c30 [ 217.954465][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 217.954469][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 217.954473][ C1] CR2: 000000c420000240 CR3: 0000000099b28000 CR4: 00000000001406e0 [ 217.954477][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 217.954482][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 217.954484][ C1] Call Trace: [ 217.954487][ C1] [ 217.954490][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 217.954494][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 217.954497][ C1] ? __msecs_to_jiffies+0x4a/0x60 [ 217.954501][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 217.954504][ C1] ? find_next_and_bit+0x19a/0x200 [ 217.954507][ C1] ? update_group_capacity+0x920/0x920 [ 217.954510][ C1] ? __kasan_check_read+0x11/0x20 [ 217.954513][ C1] ? mark_lock+0xc2/0x1220 [ 217.954517][ C1] ? __kasan_check_read+0x11/0x20 [ 217.954520][ C1] ? __kasan_check_read+0x11/0x20 [ 217.954523][ C1] ? activate_task+0x212/0x490 [ 217.954527][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 217.954530][ C1] ? find_next_and_bit+0x19a/0x200 [ 217.954533][ C1] load_balance+0x389/0x2a90 [ 217.954536][ C1] ? __kasan_check_read+0x11/0x20 [ 217.954539][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 217.954542][ C1] ? find_busiest_group+0x31b0/0x31b0 [ 217.954545][ C1] ? rcu_read_lock_held+0x9c/0xb0 [ 217.954549][ C1] ? rcu_read_lock_held_common+0x130/0x130 [ 217.954552][ C1] rebalance_domains+0x66a/0xba0 [ 217.954555][ C1] ? load_balance+0x2a90/0x2a90 [ 217.954558][ C1] _nohz_idle_balance+0x336/0x3f0 [ 217.954561][ C1] run_rebalance_domains+0x1c6/0x2d0 [ 217.954564][ C1] __do_softirq+0x262/0x98c [ 217.954568][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 217.954570][ C1] irq_exit+0x19b/0x1e0 [ 217.954573][ C1] scheduler_ipi+0x38c/0x610 [ 217.954577][ C1] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 217.954580][ C1] smp_reschedule_interrupt+0x78/0x4c0 [ 217.954583][ C1] reschedule_interrupt+0xf/0x20 [ 217.954585][ C1] [ 217.954589][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 217.954598][ C1] Code: 88 6e 59 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 44 8b 52 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 34 8b 52 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be 53 0b fa e8 f9 [ 217.954601][ C1] RSP: 0018:ffff8880a98cfd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 [ 217.954609][ C1] RAX: 1ffffffff11e643f RBX: ffff8880a98ba340 RCX: 0000000000000000 [ 217.954613][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98babdc [ 217.954618][ C1] RBP: ffff8880a98cfd98 R08: ffff8880a98ba340 R09: 0000000000000000 [ 217.954622][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 217.954626][ C1] R13: ffffffff89c80640 R14: 0000000000000000 R15: 0000000000000001 [ 217.954629][ C1] ? default_idle+0x4e/0x360 [ 217.954632][ C1] arch_cpu_idle+0xa/0x10 [ 217.954635][ C1] default_idle_call+0x84/0xb0 [ 217.954638][ C1] do_idle+0x3b7/0x6e0 [ 217.954641][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 217.954644][ C1] cpu_startup_entry+0x1b/0x20 [ 217.954648][ C1] start_secondary+0x2f4/0x410 [ 217.954651][ C1] ? set_cpu_sibling_map+0x2180/0x2180 [ 217.954654][ C1] secondary_startup_64+0xa4/0xb0 [ 217.955620][ T1079] Kernel panic - not syncing: hung_task: blocked tasks [ 218.383678][ T1079] CPU: 0 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191030 #0 [ 218.392277][ T1079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 218.402448][ T1079] Call Trace: [ 218.405748][ T1079] dump_stack+0x172/0x1f0 [ 218.410685][ T1079] panic+0x2e3/0x75c [ 218.414570][ T1079] ? add_taint.cold+0x16/0x16 [ 218.419242][ T1079] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 218.425665][ T1079] ? ___preempt_schedule+0x16/0x18 [ 218.430777][ T1079] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 218.437025][ T1079] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 218.443180][ T1079] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 218.449420][ T1079] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 218.455960][ T1079] watchdog+0xca0/0x1350 [ 218.460383][ T1079] kthread+0x361/0x430 [ 218.464712][ T1079] ? reset_hung_task_detector+0x30/0x30 [ 218.470339][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 218.477328][ T1079] ret_from_fork+0x24/0x30 [ 218.483606][ T1079] Kernel Offset: disabled [ 218.488220][ T1079] Rebooting in 86400 seconds..