[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 64.907185][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.907195][ T26] audit: type=1800 audit(1564266281.399:29): pid=9711 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 64.940319][ T26] audit: type=1800 audit(1564266281.399:30): pid=9711 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.219' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 532.104806][ T1057] INFO: task syz-executor509:9863 blocked for more than 143 seconds. [ 532.113053][ T1057] Not tainted 5.3.0-rc1+ #105 [ 532.119040][ T1057] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 532.127914][ T1057] syz-executor509 D28384 9863 9860 0x00004004 [ 532.134249][ T1057] Call Trace: [ 532.141267][ T1057] __schedule+0x755/0x1580 [ 532.145929][ T1057] ? __sched_text_start+0x8/0x8 [ 532.150981][ T1057] ? rwlock_bug.part.0+0x90/0x90 [ 532.156230][ T1057] ? rwsem_down_read_slowpath+0x2b8/0xf90 [ 532.161959][ T1057] schedule+0xa8/0x270 [ 532.166328][ T1057] rwsem_down_read_slowpath+0x4cc/0xf90 [ 532.171973][ T1057] ? down_write_killable_nested+0x180/0x180 [ 532.178220][ T1057] ? mark_held_locks+0xf0/0xf0 [ 532.182986][ T1057] ? free_object+0x9/0x70 [ 532.187536][ T1057] ? __hrtimer_init+0xe1/0x250 [ 532.192305][ T1057] ? lock_acquire+0x190/0x410 [ 532.197213][ T1057] ? __do_page_fault+0xaa2/0xdd0 [ 532.202193][ T1057] down_read+0x1f4/0x3f0 [ 532.206680][ T1057] ? down_read+0xa3/0x3f0 [ 532.211004][ T1057] ? down_read+0x1f4/0x3f0 [ 532.215621][ T1057] ? down_read_trylock+0x9b/0x1a0 [ 532.220641][ T1057] ? down_read_killable+0x460/0x460 [ 532.226060][ T1057] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 532.232651][ T1057] ? trace_hardirqs_on+0x67/0x240 [ 532.237926][ T1057] __do_page_fault+0xaa2/0xdd0 [ 532.242752][ T1057] ? page_fault+0x16/0x40 [ 532.247668][ T1057] do_page_fault+0x38/0x590 [ 532.252171][ T1057] page_fault+0x39/0x40 [ 532.256630][ T1057] RIP: 0033:0x4ab79d [ 532.260531][ T1057] Code: Bad RIP value. [ 532.264840][ T1057] RSP: 002b:00007ffd6c770300 EFLAGS: 00010206 [ 532.271011][ T1057] RAX: 00000000004ab8c0 RBX: 0000000000000001 RCX: 00000000006e0330 [ 532.279284][ T1057] RDX: 0000000000407620 RSI: 0000000000000000 RDI: 00000000004ccb90 [ 532.287445][ T1057] RBP: 00007ffd6c770320 R08: 000000037ffffa00 R09: 000000037ffffa00 [ 532.295753][ T1057] R10: 00007ffd6c770390 R11: 0000000000000000 R12: 0000000000000001 [ 532.303815][ T1057] R13: 00000000006e0320 R14: 000000000000002d R15: 20c49ba5e353f7cf [ 532.312043][ T1057] INFO: task syz-executor509:9864 blocked for more than 143 seconds. [ 532.320374][ T1057] Not tainted 5.3.0-rc1+ #105 [ 532.325784][ T1057] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 532.335069][ T1057] syz-executor509 D28456 9864 9860 0x80004004 [ 532.342183][ T1057] Call Trace: [ 532.345792][ T1057] __schedule+0x755/0x1580 [ 532.350388][ T1057] ? __sched_text_start+0x8/0x8 [ 532.356046][ T1057] ? rwlock_bug.part.0+0x90/0x90 [ 532.361092][ T1057] ? rwsem_down_read_slowpath+0x645/0xf90 [ 532.367046][ T1057] schedule+0xa8/0x270 [ 532.371137][ T1057] rwsem_down_read_slowpath+0x4cc/0xf90 [ 532.377277][ T1057] ? down_write_killable_nested+0x180/0x180 [ 532.383256][ T1057] ? mark_held_locks+0xf0/0xf0 [ 532.388260][ T1057] ? lock_acquire+0x190/0x410 [ 532.393026][ T1057] ? do_exit+0x47b/0x2eb0 [ 532.397559][ T1057] down_read+0x1f4/0x3f0 [ 532.401798][ T1057] ? down_read+0xa3/0x3f0 [ 532.406389][ T1057] ? down_read+0x1f4/0x3f0 [ 532.412543][ T1057] ? down_read_killable+0x460/0x460 [ 532.417963][ T1057] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 532.424196][ T1057] ? sync_mm_rss+0xa4/0x1c0 [ 532.428956][ T1057] do_exit+0x47b/0x2eb0 [ 532.433113][ T1057] ? mm_update_next_owner+0x640/0x640 [ 532.438693][ T1057] ? __kasan_check_write+0x14/0x20 [ 532.443893][ T1057] ? lock_downgrade+0x920/0x920 [ 532.448953][ T1057] ? rwlock_bug.part.0+0x90/0x90 [ 532.453885][ T1057] ? get_signal+0x20e/0x2500 [ 532.458769][ T1057] do_group_exit+0x135/0x360 [ 532.463353][ T1057] get_signal+0x47c/0x2500 [ 532.467976][ T1057] ? put_ctx+0xd2/0x120 [ 532.472210][ T1057] ? _perf_ioctl+0x13e0/0x13e0 [ 532.477171][ T1057] ? do_vfs_ioctl+0x120/0x13e0 [ 532.481931][ T1057] do_signal+0x87/0x1700 [ 532.486453][ T1057] ? __fget+0x384/0x560 [ 532.490609][ T1057] ? setup_sigcontext+0x7d0/0x7d0 [ 532.495957][ T1057] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 532.502198][ T1057] ? do_futex+0x1dc0/0x1dc0 [ 532.507254][ T1057] ? trace_hardirqs_on+0x67/0x240 [ 532.512287][ T1057] exit_to_usermode_loop+0x286/0x380 [ 532.517778][ T1057] do_syscall_64+0x5a9/0x6a0 [ 532.522371][ T1057] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 532.528563][ T1057] RIP: 0033:0x4468f9 [ 532.532457][ T1057] Code: 67 66 69 6c 65 3d 64 65 62 75 67 2e 63 22 0a 00 00 45 52 52 4f 52 3a 20 6f 75 74 20 6f 66 20 6d 65 6d 6f 72 79 20 64 75 72 69 <6e> 67 20 64 65 62 75 67 20 73 65 74 75 70 0a 00 00 00 00 00 00 00 [ 532.552535][ T1057] RSP: 002b:00007fccacee4db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 532.561138][ T1057] RAX: fffffffffffffe00 RBX: 00000000006dbc28 RCX: 00000000004468f9 [ 532.569419][ T1057] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 [ 532.577707][ T1057] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 532.585918][ T1057] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 532.594077][ T1057] R13: 00007ffd6c7702ff R14: 00007fccacee59c0 R15: 20c49ba5e353f7cf [ 532.602480][ T1057] INFO: lockdep is turned off. [ 532.607455][ T1057] NMI backtrace for cpu 0 [ 532.611963][ T1057] CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc1+ #105 [ 532.619579][ T1057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 532.644387][ T1057] Call Trace: [ 532.647750][ T1057] dump_stack+0x172/0x1f0 [ 532.652079][ T1057] nmi_cpu_backtrace.cold+0x70/0xb2 [ 532.657272][ T1057] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 532.663506][ T1057] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 532.669134][ T1057] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 532.675107][ T1057] arch_trigger_cpumask_backtrace+0x14/0x20 [ 532.681021][ T1057] watchdog+0x9d0/0xef0 [ 532.685181][ T1057] kthread+0x361/0x430 [ 532.689247][ T1057] ? reset_hung_task_detector+0x30/0x30 [ 532.695045][ T1057] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 532.701273][ T1057] ret_from_fork+0x24/0x30 [ 532.705754][ T1057] Sending NMI from CPU 0 to CPUs 1: [ 532.711646][ C1] NMI backtrace for cpu 1 [ 532.711650][ C1] CPU: 1 PID: 9865 Comm: syz-executor509 Not tainted 5.3.0-rc1+ #105 [ 532.711654][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 532.711657][ C1] RIP: 0010:debug_lockdep_rcu_enabled+0x75/0xa0 [ 532.711665][ C1] Code: c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 04 84 d2 75 23 8b 05 ac 69 46 08 85 c0 74 07 e8 2f ff ff ff 5d c3 31 c0 <5d> c3 48 c7 c7 e4 64 a5 89 e8 9d 93 4d 00 eb a9 48 c7 c7 f4 95 a5 [ 532.711668][ C1] RSP: 0018:ffff8880938778e0 EFLAGS: 00000046 [ 532.711673][ C1] RAX: 0000000000000000 RBX: 1ffff1101270ef23 RCX: 1ffffffff134b2be [ 532.711677][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89a563f8 [ 532.711680][ C1] RBP: ffff8880938778e0 R08: 1ffffffff134ac7f R09: fffffbfff134ac80 [ 532.711683][ C1] R10: fffffbfff134ac7f R11: ffffffff89a563ff R12: ffff888091d68e10 [ 532.711687][ C1] R13: ffffffff818afe97 R14: ffff888093877998 R15: 0000000000000001 [ 532.711691][ C1] FS: 00007fccacec4700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 532.711694][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 532.711697][ C1] CR2: ffffffffff600400 CR3: 00000000a0107000 CR4: 00000000001406e0 [ 532.711700][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 532.711704][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 532.711705][ C1] Call Trace: [ 532.711707][ C1] lock_release+0x60a/0x960 [ 532.711709][ C1] ? __mutex_lock+0x3da/0x1340 [ 532.711711][ C1] ? lock_downgrade+0x920/0x920 [ 532.711714][ C1] ? trace_hardirqs_on_caller+0x6a/0x240 [ 532.711716][ C1] ? mutex_lock_io_nested+0x11d0/0x11d0 [ 532.711719][ C1] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 532.711721][ C1] __mutex_unlock_slowpath+0x8e/0x6b0 [ 532.711723][ C1] ? retint_kernel+0x2b/0x2b [ 532.711725][ C1] ? wait_for_completion+0x440/0x440 [ 532.711727][ C1] ? perf_mmap+0x79f/0x19b0 [ 532.711729][ C1] mutex_unlock+0xd/0x10 [ 532.711731][ C1] perf_mmap+0x727/0x19b0 [ 532.711733][ C1] ? perf_release+0x50/0x50 [ 532.711735][ C1] ? memset+0x32/0x40 [ 532.711742][ C1] mmap_region+0xc35/0x1760 [ 532.711744][ C1] ? __x64_sys_brk+0x760/0x760 [ 532.711747][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 532.711749][ C1] ? get_unmapped_area+0x2ad/0x3d0 [ 532.711751][ C1] do_mmap+0x82e/0x1090 [ 532.711753][ C1] vm_mmap_pgoff+0x1c5/0x230 [ 532.711756][ C1] ? vma_is_stack_for_current+0xd0/0xd0 [ 532.711758][ C1] ? ksys_dup3+0x3e0/0x3e0 [ 532.711760][ C1] ? finish_task_switch+0x147/0x720 [ 532.711762][ C1] ksys_mmap_pgoff+0x4aa/0x630 [ 532.711765][ C1] ? find_mergeable_anon_vma+0x2e0/0x2e0 [ 532.711767][ C1] ? __kasan_check_write+0x14/0x20 [ 532.711769][ C1] ? switch_fpu_return+0x1fa/0x4f0 [ 532.711771][ C1] __x64_sys_mmap+0xe9/0x1b0 [ 532.711773][ C1] do_syscall_64+0xfd/0x6a0 [ 532.711776][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 532.711777][ C1] RIP: 0033:0x4468f9 [ 532.711785][ C1] Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 532.711788][ C1] RSP: 002b:00007fccacec3da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 [ 532.711793][ C1] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004468f9 [ 532.711797][ C1] RDX: 0000000003000001 RSI: 0000000000003000 RDI: 0000000020ffd000 [ 532.711800][ C1] RBP: 00000000006dbc30 R08: 0000000000000003 R09: 0000000000000000 [ 532.711803][ C1] R10: 0000000000001011 R11: 0000000000000246 R12: 00000000006dbc3c [ 532.711807][ C1] R13: 00007ffd6c7702ff R14: 00007fccacec49c0 R15: 20c49ba5e353f7cf [ 532.712977][ T1057] Kernel panic - not syncing: hung_task: blocked tasks [ 533.075798][ T1057] CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc1+ #105 [ 533.083416][ T1057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 533.093460][ T1057] Call Trace: [ 533.096751][ T1057] dump_stack+0x172/0x1f0 [ 533.101078][ T1057] panic+0x2dc/0x755 [ 533.104964][ T1057] ? add_taint.cold+0x16/0x16 [ 533.109636][ T1057] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 533.115286][ T1057] ? ___preempt_schedule+0x16/0x20 [ 533.120414][ T1057] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 533.126558][ T1057] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 533.132707][ T1057] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 533.138871][ T1057] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 533.145020][ T1057] watchdog+0x9e1/0xef0 [ 533.149172][ T1057] kthread+0x361/0x430 [ 533.153409][ T1057] ? reset_hung_task_detector+0x30/0x30 [ 533.158944][ T1057] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 533.165173][ T1057] ret_from_fork+0x24/0x30 [ 533.170912][ T1057] Kernel Offset: disabled [ 533.175257][ T1057] Rebooting in 86400 seconds..