[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.427141] audit: type=1800 audit(1576436703.817:33): pid=7547 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 46.218249] kauditd_printk_skb: 1 callbacks suppressed [ 46.218262] audit: type=1400 audit(1576436708.607:35): avc: denied { map } for pid=7721 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. executing program executing program [ 567.648526] audit: type=1400 audit(1576437230.037:36): avc: denied { map } for pid=7733 comm="syz-executor484" path="/root/syz-executor484439268" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 758.857225] audit: type=1400 audit(1576437421.247:37): avc: denied { map } for pid=8043 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 774.413505] INFO: task login:7708 blocked for more than 140 seconds. [ 774.420319] Not tainted 4.19.89-syzkaller #0 [ 774.426458] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 774.434833] login D25064 7708 1 0x80000002 [ 774.440474] Call Trace: [ 774.443111] __schedule+0x866/0x1dc0 [ 774.447170] ? firmware_map_remove+0x1a7/0x1a7 [ 774.452639] ? mark_held_locks+0x100/0x100 [ 774.457358] ? mark_held_locks+0x100/0x100 [ 774.461622] schedule+0x92/0x1c0 [ 774.465266] schedule_timeout+0x8c8/0xfc0 [ 774.469485] ? __ldsem_down_write_nested+0x3ab/0x8f0 [ 774.474911] ? find_held_lock+0x35/0x130 [ 774.479147] ? usleep_range+0x170/0x170 [ 774.483128] ? mark_held_locks+0xb1/0x100 [ 774.487677] ? _raw_spin_unlock_irq+0x28/0x90 [ 774.492188] ? __ldsem_down_write_nested+0x3ab/0x8f0 [ 774.497655] ? _raw_spin_unlock_irq+0x28/0x90 [ 774.502160] ? lockdep_hardirqs_on+0x415/0x5d0 [ 774.507035] ? trace_hardirqs_on+0x67/0x220 [ 774.511375] __ldsem_down_write_nested+0x3b3/0x8f0 [ 774.516623] ? __ldsem_down_read_nested+0x720/0x720 [ 774.521660] ? __lock_is_held+0xb6/0x140 [ 774.526133] ldsem_down_write+0x33/0x40 [ 774.530145] ? ldsem_down_write+0x33/0x40 [ 774.534623] tty_ldisc_lock+0x50/0x90 [ 774.538459] tty_ldisc_hangup+0x1b9/0x630 [ 774.542691] __tty_hangup.part.0+0x306/0x720 [ 774.547527] ? tty_read+0x2a0/0x2a0 [ 774.551170] tty_vhangup_session+0x25/0x30 [ 774.556582] disassociate_ctty.part.0+0xb4/0x6f0 [ 774.561353] disassociate_ctty+0x81/0xa0 [ 774.565817] do_exit+0x17bb/0x3080 [ 774.569374] ? vfs_write+0x91/0x560 [ 774.573002] ? mm_update_next_owner+0x660/0x660 [ 774.578471] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 774.584290] ? ksys_write+0x1f1/0x2d0 [ 774.588121] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 774.592965] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 774.598039] do_group_exit+0x135/0x370 [ 774.601936] __x64_sys_exit_group+0x44/0x50 [ 774.606529] do_syscall_64+0xfd/0x620 [ 774.610448] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 774.615948] RIP: 0033:0x7feea78061e8 [ 774.619685] Code: Bad RIP value. [ 774.623050] RSP: 002b:00007ffd95078928 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 774.631187] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feea78061e8 [ 774.638871] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 774.646529] RBP: 00007feea7adb840 R08: 00000000000000e7 R09: ffffffffffffffa8 [ 774.654069] R10: 00007feea7ae1740 R11: 0000000000000246 R12: 00007feea7adb840 [ 774.661340] R13: 0000000000000001 R14: 0000000000000001 R15: 000000000060b798 [ 774.668947] [ 774.668947] Showing all locks held in the system: [ 774.675787] 1 lock held by khungtaskd/1067: [ 774.680104] #0: 0000000090858695 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 774.689871] 1 lock held by rsyslogd/7586: [ 774.694288] #0: 00000000ac8078f1 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 774.702228] 2 locks held by login/7708: [ 774.706473] #0: 00000000576d6d35 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x73/0xb0 [ 774.714737] #1: 00000000a4df1b4f (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x33/0x40 [ 774.723081] 2 locks held by getty/7709: [ 774.727321] #0: 0000000075f57b4f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.735872] #1: 000000001a46ab34 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.745109] 2 locks held by getty/7710: [ 774.749113] #0: 000000003a91e387 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.757716] #1: 00000000900096fb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.766955] 2 locks held by getty/7711: [ 774.771038] #0: 00000000718a31f3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.779678] #1: 00000000e2e3c86e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.789032] 2 locks held by getty/7712: [ 774.793032] #0: 00000000f8757501 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.801651] #1: 00000000775152d7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.810810] 2 locks held by getty/7713: [ 774.815865] #0: 00000000327d5589 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.824483] #1: 00000000e7b4e0e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.833633] 2 locks held by getty/7714: [ 774.837603] #0: 00000000b2d034f7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.846154] #1: 00000000acd61342 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 774.855422] 4 locks held by syz-executor484/8041: [ 774.860260] #0: 00000000a4df1b4f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 774.868795] #1: 00000000f85c5daa (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 [ 774.877783] #2: 00000000c1b8996f (&rq->lock){-.-.}, at: __schedule+0x1f8/0x1dc0 [ 774.885813] #3: 0000000090858695 (rcu_read_lock){....}, at: cpuacct_charge+0x82/0x360 [ 774.894462] [ 774.896119] ============================================= [ 774.896119] [ 774.903317] NMI backtrace for cpu 0 [ 774.907014] CPU: 0 PID: 1067 Comm: khungtaskd Not tainted 4.19.89-syzkaller #0 [ 774.914568] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 774.924106] Call Trace: [ 774.926791] dump_stack+0x197/0x210 [ 774.930549] nmi_cpu_backtrace.cold+0x63/0xa4 [ 774.935170] ? lapic_can_unplug_cpu.cold+0x47/0x47 [ 774.940113] nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 [ 774.945400] arch_trigger_cpumask_backtrace+0x14/0x20 [ 774.950605] watchdog+0x9df/0xee0 [ 774.954087] kthread+0x354/0x420 [ 774.957458] ? reset_hung_task_detector+0x30/0x30 [ 774.962462] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 774.968013] ret_from_fork+0x24/0x30 [ 774.971842] Sending NMI from CPU 0 to CPUs 1: [ 774.977583] NMI backtrace for cpu 1 [ 774.977590] CPU: 1 PID: 8041 Comm: syz-executor484 Not tainted 4.19.89-syzkaller #0 [ 774.977596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 774.977600] RIP: 0010:rcu_lockdep_current_cpu_online+0x97/0x1c0 [ 774.977610] Code: 3c 20 00 0f 85 39 01 00 00 49 8b 85 08 16 00 00 4c 8d a8 f8 e9 ff ff 48 3d 20 af f9 88 0f 84 c3 00 00 00 49 8d bd d8 12 00 00 <48> 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 cf 00 00 00 49 8b 9d d8 [ 774.977614] RSP: 0018:ffff888089c97660 EFLAGS: 00000087 [ 774.977621] RAX: ffffffff88f9ac08 RBX: ffffffff893b9740 RCX: 0000000000000000 [ 774.977626] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff88f9a8d8 [ 774.977631] RBP: ffff888089c97688 R08: 1ffff11015d24732 R09: ffffed1015d24733 [ 774.977635] R10: ffffed1015d24732 R11: ffff8880ae923993 R12: dffffc0000000000 [ 774.977640] R13: ffffffff88f99600 R14: ffff8880a91f0400 R15: 0000000000000dab [ 774.977645] FS: 0000000000d51880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 774.977649] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 774.977654] CR2: 00007ffdc72db0a8 CR3: 00000000927ed000 CR4: 00000000001406e0 [ 774.977659] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 774.977664] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 774.977667] Call Trace: [ 774.977671] rcu_read_lock_sched_held+0x97/0x130 [ 774.977674] update_curr+0x73b/0x8a0 [ 774.977677] ? pick_next_entity+0x198/0x3f0 [ 774.977681] ? trace_hardirqs_on_caller+0x6a/0x220 [ 774.977684] pick_next_task_fair+0x6bf/0x1580 [ 774.977688] ? kvm_clock_read+0x18/0x30 [ 774.977691] ? kvm_sched_clock_read+0x9/0x20 [ 774.977694] ? sched_clock+0x2e/0x50 [ 774.977698] ? run_rebalance_domains+0x2e0/0x2e0 [ 774.977701] __schedule+0x456/0x1dc0 [ 774.977704] ? retint_kernel+0x2d/0x2d [ 774.977708] ? firmware_map_remove+0x1a7/0x1a7 [ 774.977711] ? check_memory_region+0x3a/0x190 [ 774.977714] schedule+0x92/0x1c0 [ 774.977718] paste_selection+0x2e8/0x443 [ 774.977721] ? set_selection+0x1370/0x1370 [ 774.977724] ? lock_downgrade+0x880/0x880 [ 774.977728] ? wake_up_q+0x100/0x100 [ 774.977731] tioclinux+0x133/0x470 [ 774.977734] vt_ioctl+0x19ab/0x2530 [ 774.977738] ? complete_change_console+0x3a0/0x3a0 [ 774.977741] ? avc_has_extended_perms+0xa78/0x10f0 [ 774.977745] ? lock_downgrade+0x880/0x880 [ 774.977748] ? avc_ss_reset+0x190/0x190 [ 774.977752] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 774.977755] ? tty_jobctrl_ioctl+0x50/0xcd0 [ 774.977759] ? complete_change_console+0x3a0/0x3a0 [ 774.977762] tty_ioctl+0x7f3/0x1510 [ 774.977765] ? tty_vhangup+0x30/0x30 [ 774.977769] ? thp_get_unmapped_area+0x1f0/0x1f0 [ 774.977773] ? __handle_mm_fault+0x7d1/0x3f80 [ 774.977776] ? __might_sleep+0x95/0x190 [ 774.977779] ? tty_vhangup+0x30/0x30 [ 774.977782] do_vfs_ioctl+0xd5f/0x1380 [ 774.977786] ? selinux_file_ioctl+0x46f/0x5e0 [ 774.977789] ? selinux_file_ioctl+0x125/0x5e0 [ 774.977793] ? ioctl_preallocate+0x210/0x210 [ 774.977797] ? selinux_file_mprotect+0x620/0x620 [ 774.977800] ? gup_pgd_range+0x1afc/0x3910 [ 774.977803] ? write_comp_data+0x5b/0x70 [ 774.977806] ? up_read+0x1a/0x110 [ 774.977810] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 774.977815] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 774.977818] ? security_file_ioctl+0x8d/0xc0 [ 774.977821] ksys_ioctl+0xab/0xd0 [ 774.977824] __x64_sys_ioctl+0x73/0xb0 [ 774.977827] do_syscall_64+0xfd/0x620 [ 774.977831] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 774.977834] RIP: 0033:0x441209 [ 774.977844] Code: e8 3c ad 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 774.977847] RSP: 002b:00007ffe6c93cea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 774.977855] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441209 [ 774.977859] RDX: 0000000020000080 RSI: 000000000000541c RDI: 0000000000000003 [ 774.977863] RBP: 000000000008daa5 R08: 00000000004002c8 R09: 00000000004002c8 [ 774.977867] R10: 000000000000000d R11: 0000000000000246 R12: 0000000000402030 [ 774.977872] R13: 00000000004020c0 R14: 0000000000000000 R15: 0000000000000000 [ 774.980902] Kernel panic - not syncing: hung_task: blocked tasks [ 775.382289] CPU: 0 PID: 1067 Comm: khungtaskd Not tainted 4.19.89-syzkaller #0 [ 775.389648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 775.398999] Call Trace: [ 775.401595] dump_stack+0x197/0x210 [ 775.405317] panic+0x26a/0x50e [ 775.408511] ? __warn_printk+0xf3/0xf3 [ 775.412399] ? lapic_can_unplug_cpu.cold+0x47/0x47 [ 775.417332] ? ___preempt_schedule+0x16/0x18 [ 775.421745] ? nmi_trigger_cpumask_backtrace+0x165/0x1f8 [ 775.427198] ? nmi_trigger_cpumask_backtrace+0x1c1/0x1f8 [ 775.432652] ? nmi_trigger_cpumask_backtrace+0x1cb/0x1f8 [ 775.438104] ? nmi_trigger_cpumask_backtrace+0x165/0x1f8 [ 775.443562] watchdog+0x9f0/0xee0 [ 775.447045] kthread+0x354/0x420 [ 775.450410] ? reset_hung_task_detector+0x30/0x30 [ 775.455253] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 775.460799] ret_from_fork+0x24/0x30 [ 775.466432] Kernel Offset: disabled [ 775.470217] Rebooting in 86400 seconds..