[ 34.786978] audit: type=1800 audit(1552010231.030:27): pid=7461 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.807744] audit: type=1800 audit(1552010231.030:28): pid=7461 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.593590] audit: type=1800 audit(1552010231.900:29): pid=7461 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 [ 35.618379] audit: type=1800 audit(1552010231.900:30): pid=7461 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 '10.128.0.109' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.189791] WARNING: CPU: 1 PID: 7613 at kernel/workqueue.c:3020 __flush_work+0x74c/0x8a0 [ 47.198568] Kernel panic - not syncing: panic_on_warn set ... [ 47.204446] CPU: 1 PID: 7613 Comm: syz-executor608 Not tainted 5.0.0+ #11 [ 47.211358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.220853] Call Trace: [ 47.223440] dump_stack+0x172/0x1f0 [ 47.227077] ? __flush_work+0x6d0/0x8a0 [ 47.231070] panic+0x2cb/0x65c [ 47.234260] ? __warn_printk+0xf3/0xf3 [ 47.238143] ? __flush_work+0x74c/0x8a0 [ 47.242111] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.247637] ? __warn.cold+0x5/0x45 [ 47.251252] ? __warn+0xe8/0x1d0 [ 47.254609] ? __flush_work+0x74c/0x8a0 [ 47.258574] __warn.cold+0x20/0x45 [ 47.262103] ? __flush_work+0x74c/0x8a0 [ 47.266066] report_bug+0x263/0x2b0 [ 47.269686] do_error_trap+0x11b/0x200 [ 47.273566] do_invalid_op+0x37/0x50 [ 47.277270] ? __flush_work+0x74c/0x8a0 [ 47.281235] invalid_op+0x14/0x20 [ 47.284677] RIP: 0010:__flush_work+0x74c/0x8a0 [ 47.289247] Code: 74 58 e8 77 12 26 00 fb 66 0f 1f 44 00 00 45 31 e4 e9 86 fd ff ff e8 63 12 26 00 0f 0b 45 31 e4 e9 77 fd ff ff e8 54 12 26 00 <0f> 0b 45 31 e4 e9 68 fd ff ff e8 45 12 26 00 4c 89 ff 45 31 e4 e8 [ 47.308136] RSP: 0018:ffff8880a0fa7608 EFLAGS: 00010293 [ 47.313488] RAX: ffff888094918240 RBX: ffff8880a41b3d80 RCX: ffffffff814a14cb [ 47.320746] RDX: 0000000000000000 RSI: ffffffff814a1b7c RDI: 0000000000000001 [ 47.328004] RBP: ffff8880a0fa7778 R08: ffff888094918240 R09: ffffed10141f4edd [ 47.335281] R10: ffffed10141f4edc R11: 0000000000000003 R12: dffffc0000000000 [ 47.342539] R13: ffff8880a0fa7750 R14: 0000000000000000 R15: 0000000000000001 [ 47.349962] ? __flush_work+0x9b/0x8a0 [ 47.353843] ? __flush_work+0x74c/0x8a0 [ 47.357813] ? __flush_work+0x74c/0x8a0 [ 47.361787] ? insert_work+0x3a0/0x3a0 [ 47.365669] ? mark_held_locks+0xa4/0xf0 [ 47.369725] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.375253] ? refcount_sub_and_test_checked+0x154/0x200 [ 47.380692] ? refcount_dec_not_one+0x1f0/0x1f0 [ 47.385358] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 47.391499] flush_work+0x18/0x20 [ 47.394944] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 47.400132] drm_atomic_state_default_clear+0x37c/0xd60 [ 47.405491] drm_atomic_state_clear+0x9d/0xc0 [ 47.409977] __drm_atomic_state_free+0x3c/0xf0 [ 47.414662] drm_atomic_helper_set_config+0xe5/0x160 [ 47.419762] drm_mode_setcrtc+0x613/0x1490 [ 47.423995] ? drm_mode_getcrtc+0x870/0x870 [ 47.428308] ? drm_dev_exit+0x22/0x60 [ 47.432105] ? find_held_lock+0x35/0x130 [ 47.436161] ? drm_dev_exit+0x22/0x60 [ 47.439958] ? drm_lease_owner+0x45/0x60 [ 47.444008] ? drm_is_current_master+0x5c/0x140 [ 47.448687] drm_ioctl_kernel+0x23b/0x2e0 [ 47.452823] ? drm_mode_getcrtc+0x870/0x870 [ 47.457147] ? drm_setversion+0x8c0/0x8c0 [ 47.461302] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.466828] ? _copy_from_user+0xdd/0x150 [ 47.470967] drm_ioctl+0x545/0xa50 [ 47.474625] ? drm_mode_getcrtc+0x870/0x870 [ 47.478944] ? drm_version+0x3d0/0x3d0 [ 47.482825] ? debug_check_no_obj_freed+0x200/0x464 [ 47.487840] ? trace_hardirqs_off+0x62/0x220 [ 47.492237] ? drm_version+0x3d0/0x3d0 [ 47.496117] do_vfs_ioctl+0xd6e/0x1390 [ 47.499993] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.505654] ? ioctl_preallocate+0x210/0x210 [ 47.510079] ? putname+0xef/0x130 [ 47.513519] ? putname+0xef/0x130 [ 47.516962] ? rcu_read_lock_sched_held+0x110/0x130 [ 47.521968] ? kmem_cache_free+0x225/0x260 [ 47.526192] ? putname+0xf4/0x130 [ 47.529749] ? do_sys_open+0x31d/0x5d0 [ 47.533728] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.539266] ? security_file_ioctl+0x93/0xc0 [ 47.543673] ksys_ioctl+0xab/0xd0 [ 47.547136] __x64_sys_ioctl+0x73/0xb0 [ 47.551104] do_syscall_64+0x103/0x610 [ 47.554994] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.560196] RIP: 0033:0x443de9 [ 47.563389] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 47.582346] RSP: 002b:00007ffe91eaa1e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.590061] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443de9 [ 47.597320] RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003 [ 47.604580] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 47.611839] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401af0 [ 47.619105] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 47.627203] Kernel Offset: disabled [ 47.630947] Rebooting in 86400 seconds..