[ 56.550499][ T26] audit: type=1800 audit(1572913126.373:25): pid=8687 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.584801][ T26] audit: type=1800 audit(1572913126.373:26): pid=8687 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.607253][ T26] audit: type=1800 audit(1572913126.373:27): pid=8687 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. [ 57.382627][ T8752] sshd (8752) 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 '10.128.10.39' (ECDSA) to the list of known hosts. syzkaller login: [ 236.266534][ T1079] INFO: task khugepaged:1086 blocked for more than 143 seconds. [ 236.274360][ T1079] Not tainted 5.4.0-rc5-next-20191031 #0 [ 236.280603][ T1079] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 236.290004][ T1079] khugepaged D26960 1086 2 0x80004000 [ 236.296336][ T1079] Call Trace: [ 236.299702][ T1079] __schedule+0x94a/0x1e70 [ 236.304139][ T1079] ? __sched_text_start+0x8/0x8 [ 236.309050][ T1079] ? blk_insert_cloned_request+0x530/0x530 [ 236.314907][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 236.320184][ T1079] ? __lock_page+0x3d9/0xab0 [ 236.324779][ T1079] ? _raw_spin_unlock_irq+0x23/0x80 [ 236.330039][ T1079] schedule+0xdc/0x2b0 [ 236.334128][ T1079] io_schedule+0x1c/0x70 [ 236.338549][ T1079] __lock_page+0x422/0xab0 [ 236.342986][ T1079] ? wait_on_page_bit+0xa60/0xa60 [ 236.348110][ T1079] ? page_cache_next_miss+0x340/0x340 [ 236.353532][ T1079] ? ___might_sleep+0x163/0x2c0 [ 236.358468][ T1079] ? __might_sleep+0x95/0x190 [ 236.363147][ T1079] mpage_prepare_extent_to_map+0xb3f/0xf90 [ 236.369025][ T1079] ? mpage_process_page_bufs+0x780/0x780 [ 236.374699][ T1079] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 236.380745][ T1079] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 236.387035][ T1079] ext4_writepages+0xb6a/0x2e70 [ 236.391915][ T1079] ? __this_cpu_preempt_check+0x2c/0x190 [ 236.397641][ T1079] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 236.403204][ T1079] ? 0xffffffff81000000 [ 236.407413][ T1079] ? mark_lock+0xc2/0x1220 [ 236.411831][ T1079] ? prep_new_page+0x19f/0x200 [ 236.417421][ T1079] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 236.423410][ T1079] ? find_held_lock+0x35/0x130 [ 236.428226][ T1079] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 236.434252][ T1079] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 236.439794][ T1079] do_writepages+0xfa/0x2a0 [ 236.444312][ T1079] ? do_writepages+0xfa/0x2a0 [ 236.449048][ T1079] ? lock_downgrade+0x920/0x920 [ 236.453922][ T1079] ? page_writeback_cpu_online+0x20/0x20 [ 236.459637][ T1079] ? __kasan_check_read+0x11/0x20 [ 236.464667][ T1079] ? do_raw_spin_unlock+0x57/0x270 [ 236.469865][ T1079] ? _raw_spin_unlock+0x28/0x40 [ 236.474756][ T1079] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 236.481078][ T1079] ? wbc_attach_and_unlock_inode+0x5bf/0x920 [ 236.487110][ T1079] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 236.492829][ T1079] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 236.499022][ T1079] ? lockdep_hardirqs_on+0x421/0x5e0 [ 236.504454][ T1079] filemap_flush+0x24/0x30 [ 236.509125][ T1079] collapse_file+0x36b1/0x41a0 [ 236.513911][ T1079] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 236.520138][ T1079] ? khugepaged+0x21c0/0x4360 [ 236.525310][ T1079] ? trace_event_raw_event_mm_collapse_huge_page_isolate+0x370/0x370 [ 236.533446][ T1079] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 236.539337][ T1079] ? khugepaged_find_target_node+0x142/0x180 [ 236.545315][ T1079] khugepaged+0x2da9/0x4360 [ 236.550608][ T1079] ? __kasan_check_read+0x11/0x20 [ 236.555650][ T1079] ? __lock_acquire+0x16f2/0x4a00 [ 236.560780][ T1079] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 236.566476][ T1079] ? lock_downgrade+0x920/0x920 [ 236.571331][ T1079] ? finish_wait+0x260/0x260 [ 236.575933][ T1079] ? lockdep_hardirqs_on+0x421/0x5e0 [ 236.581316][ T1079] ? trace_hardirqs_on+0x67/0x240 [ 236.586804][ T1079] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 236.593053][ T1079] ? __kthread_parkme+0x108/0x1c0 [ 236.598359][ T1079] ? __kasan_check_read+0x11/0x20 [ 236.603399][ T1079] kthread+0x361/0x430 [ 236.607511][ T1079] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 236.613146][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 236.618926][ T1079] ret_from_fork+0x24/0x30 [ 236.623759][ T1079] [ 236.623759][ T1079] Showing all locks held in the system: [ 236.631537][ T1079] 4 locks held by kworker/u4:3/232: [ 236.636771][ T1079] #0: ffff8880a7e1cd28 ((wq_completion)writeback){+.+.}, at: process_one_work+0x88b/0x1740 [ 236.646904][ T1079] #1: ffff8880a92f7dc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x8c1/0x1740 [ 236.658255][ T1079] #2: ffff888215a320d8 (&type->s_umount_key#32){++++}, at: trylock_super+0x22/0x110 [ 236.667868][ T1079] #3: ffff888215a34990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 236.678426][ T1079] 1 lock held by khungtaskd/1079: [ 236.683481][ T1079] #0: ffffffff88faba40 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 236.692846][ T1079] 1 lock held by khugepaged/1086: [ 236.697929][ T1079] #0: ffff888215a34990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 236.708180][ T1079] 3 locks held by rsyslogd/8725: [ 236.713115][ T1079] #0: ffff88809fa46920 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 236.721775][ T1079] #1: ffffffff89047e80 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 [ 236.731316][ T1079] #2: ffffffff88faba40 (rcu_read_lock){....}, at: update_curr+0x2ea/0x8d0 [ 236.740015][ T1079] 2 locks held by getty/8815: [ 236.744706][ T1079] #0: ffff8880a1cc5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.753729][ T1079] #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.763440][ T1079] 2 locks held by getty/8816: [ 236.768166][ T1079] #0: ffff8880a9348090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.777372][ T1079] #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.786973][ T1079] 2 locks held by getty/8817: [ 236.791644][ T1079] #0: ffff888098581090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.800692][ T1079] #1: ffffc90005f492e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.811182][ T1079] 2 locks held by getty/8818: [ 236.815861][ T1079] #0: ffff88809a376090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.824897][ T1079] #1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.834581][ T1079] 2 locks held by getty/8819: [ 236.839396][ T1079] #0: ffff888098c83090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.848400][ T1079] #1: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.858018][ T1079] 2 locks held by getty/8820: [ 236.862700][ T1079] #0: ffff8880a48da090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.871722][ T1079] #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.881369][ T1079] 2 locks held by getty/8821: [ 236.886031][ T1079] #0: ffff8880a06a1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 236.895106][ T1079] #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 236.904757][ T1079] 1 lock held by syz-execprog/8839: [ 236.909980][ T1079] #0: ffff888090b443e8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 [ 236.919243][ T1079] [ 236.921572][ T1079] ============================================= [ 236.921572][ T1079] [ 236.930021][ T1079] NMI backtrace for cpu 1 [ 236.934365][ T1079] CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191031 #0 [ 236.943110][ T1079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 236.953326][ T1079] Call Trace: [ 236.956615][ T1079] dump_stack+0x172/0x1f0 [ 236.961029][ T1079] nmi_cpu_backtrace.cold+0x70/0xb2 [ 236.966244][ T1079] ? vprintk_func+0x86/0x189 [ 236.970834][ T1079] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 236.976453][ T1079] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 236.982434][ T1079] arch_trigger_cpumask_backtrace+0x14/0x20 [ 236.988334][ T1079] watchdog+0xc8f/0x1350 [ 236.992687][ T1079] kthread+0x361/0x430 [ 236.996745][ T1079] ? reset_hung_task_detector+0x30/0x30 [ 237.002327][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 237.008167][ T1079] ret_from_fork+0x24/0x30 [ 237.012675][ T1079] Sending NMI from CPU 1 to CPUs 0: [ 237.018470][ C0] NMI backtrace for cpu 0 [ 237.018476][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc5-next-20191031 #0 [ 237.018482][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 237.018485][ C0] RIP: 0010:find_next_and_bit+0x70/0x200 [ 237.018495][ C0] Code: 06 48 c1 e0 03 48 8d 1c 02 48 ba 00 00 00 00 00 fc ff df 48 89 d9 48 c1 e9 03 80 3c 11 00 0f 85 63 01 00 00 4d 85 ed 4c 8b 33 <48> 89 45 c8 74 2a e8 65 ba 2d fe 48 8b 45 c8 48 ba 00 00 00 00 00 [ 237.018499][ C0] RSP: 0018:ffff8880ae809ac0 EFLAGS: 00000286 [ 237.018506][ C0] RAX: 0000000000000000 RBX: ffff8880a981c4b0 RCX: 1ffff11015303896 [ 237.018511][ C0] RDX: dffffc0000000000 RSI: ffffffff8345aaec RDI: 0000000000000006 [ 237.018515][ C0] RBP: ffff8880ae809af8 R08: ffffffff88e7a1c0 R09: ffffed1015d040d3 [ 237.018519][ C0] R10: ffffed1015d040d2 R11: ffff8880ae820697 R12: 0000000000000040 [ 237.018524][ C0] R13: ffff8880ae820690 R14: 0000000000000001 R15: 0000000000000000 [ 237.018529][ C0] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 237.018532][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 237.018537][ C0] CR2: 000000c420000240 CR3: 00000000982ab000 CR4: 00000000001406f0 [ 237.018541][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 237.018546][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 237.018548][ C0] Call Trace: [ 237.018551][ C0] [ 237.018554][ C0] ? find_held_lock+0x35/0x130 [ 237.018557][ C0] cpumask_next_and+0x49/0x50 [ 237.018560][ C0] load_balance+0x324/0x2a90 [ 237.018563][ C0] ? __kasan_check_read+0x11/0x20 [ 237.018566][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 237.018570][ C0] ? find_busiest_group+0x31b0/0x31b0 [ 237.018573][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 237.018576][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 237.018579][ C0] rebalance_domains+0x66a/0xba0 [ 237.018583][ C0] ? load_balance+0x2a90/0x2a90 [ 237.018586][ C0] _nohz_idle_balance+0x336/0x3f0 [ 237.018589][ C0] run_rebalance_domains+0x1c6/0x2d0 [ 237.018592][ C0] __do_softirq+0x262/0x98c [ 237.018595][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 237.018598][ C0] irq_exit+0x19b/0x1e0 [ 237.018601][ C0] scheduler_ipi+0x38c/0x610 [ 237.018605][ C0] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 237.018608][ C0] smp_reschedule_interrupt+0x78/0x4c0 [ 237.018611][ C0] reschedule_interrupt+0xf/0x20 [ 237.018614][ C0] [ 237.018617][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 237.018626][ C0] Code: 78 85 57 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d c4 9a 50 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 9a 50 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 2e 64 09 fa e8 d9 [ 237.018630][ C0] RSP: 0018:ffffffff88e07ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 [ 237.018638][ C0] RAX: 1ffffffff11e643f RBX: ffffffff88e7a1c0 RCX: 0000000000000000 [ 237.018642][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88e7aa5c [ 237.018647][ C0] RBP: ffffffff88e07d18 R08: ffffffff88e7a1c0 R09: 0000000000000000 [ 237.018652][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 237.018656][ C0] R13: ffffffff89c83bc0 R14: 0000000000000000 R15: 0000000000000000 [ 237.018659][ C0] ? default_idle+0x4e/0x360 [ 237.018662][ C0] arch_cpu_idle+0xa/0x10 [ 237.018665][ C0] default_idle_call+0x84/0xb0 [ 237.018668][ C0] do_idle+0x3b7/0x6e0 [ 237.018672][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 237.018675][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 237.018678][ C0] cpu_startup_entry+0x1b/0x20 [ 237.018681][ C0] rest_init+0x23b/0x371 [ 237.018684][ C0] arch_call_rest_init+0xe/0x1b [ 237.018687][ C0] start_kernel+0x904/0x943 [ 237.018690][ C0] ? mem_encrypt_init+0xb/0xb [ 237.018694][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 237.018697][ C0] ? x86_family+0x41/0x50 [ 237.018700][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 237.018704][ C0] x86_64_start_reservations+0x29/0x2b [ 237.018707][ C0] x86_64_start_kernel+0x77/0x7b [ 237.018710][ C0] secondary_startup_64+0xa4/0xb0 [ 237.019688][ T1079] Kernel panic - not syncing: hung_task: blocked tasks [ 237.424651][ T1079] CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191031 #0 [ 237.433226][ T1079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 237.443272][ T1079] Call Trace: [ 237.446561][ T1079] dump_stack+0x172/0x1f0 [ 237.450887][ T1079] panic+0x2e3/0x75c [ 237.454773][ T1079] ? add_taint.cold+0x16/0x16 [ 237.459448][ T1079] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 237.465079][ T1079] ? ___preempt_schedule+0x16/0x18 [ 237.470185][ T1079] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 237.476325][ T1079] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 237.482465][ T1079] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 237.488610][ T1079] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 237.494762][ T1079] watchdog+0xca0/0x1350 [ 237.499024][ T1079] kthread+0x361/0x430 [ 237.503086][ T1079] ? reset_hung_task_detector+0x30/0x30 [ 237.508639][ T1079] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 237.514960][ T1079] ret_from_fork+0x24/0x30 [ 237.521779][ T1079] Kernel Offset: disabled [ 237.526125][ T1079] Rebooting in 86400 seconds..