[ 37.144699] audit: type=1800 audit(1552002481.944:27): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.168139] audit: type=1800 audit(1552002481.944:28): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 37.991354] audit: type=1800 audit(1552002482.864:29): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 38.009934] audit: type=1800 audit(1552002482.864:30): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.45' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.049677] WARNING: CPU: 1 PID: 7727 at kernel/workqueue.c:3020 __flush_work+0x74c/0x8a0 [ 45.058114] Kernel panic - not syncing: panic_on_warn set ... [ 45.063991] CPU: 1 PID: 7727 Comm: syz-executor728 Not tainted 5.0.0+ #11 [ 45.070899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.080237] Call Trace: [ 45.082816] dump_stack+0x172/0x1f0 [ 45.086429] ? __flush_work+0x6d0/0x8a0 [ 45.090395] panic+0x2cb/0x65c [ 45.093574] ? __warn_printk+0xf3/0xf3 [ 45.097448] ? __flush_work+0x74c/0x8a0 [ 45.101404] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.106946] ? __warn.cold+0x5/0x45 [ 45.110558] ? __warn+0xe8/0x1d0 [ 45.113909] ? __flush_work+0x74c/0x8a0 [ 45.117899] __warn.cold+0x20/0x45 [ 45.121421] ? __flush_work+0x74c/0x8a0 [ 45.125375] report_bug+0x263/0x2b0 [ 45.128987] do_error_trap+0x11b/0x200 [ 45.132857] do_invalid_op+0x37/0x50 [ 45.136567] ? __flush_work+0x74c/0x8a0 [ 45.140544] invalid_op+0x14/0x20 [ 45.143978] RIP: 0010:__flush_work+0x74c/0x8a0 [ 45.148579] 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 [ 45.167483] RSP: 0018:ffff888093a77608 EFLAGS: 00010293 [ 45.172843] RAX: ffff88808f10a340 RBX: ffff8880a56d0fc0 RCX: ffffffff814a14cb [ 45.180096] RDX: 0000000000000000 RSI: ffffffff814a1b7c RDI: 0000000000000001 [ 45.187362] RBP: ffff888093a77778 R08: ffff88808f10a340 R09: ffffed101274eedd [ 45.194624] R10: ffffed101274eedc R11: 0000000000000003 R12: dffffc0000000000 [ 45.201872] R13: ffff888093a77750 R14: 0000000000000000 R15: 0000000000000001 [ 45.209141] ? __flush_work+0x9b/0x8a0 [ 45.213006] ? __flush_work+0x74c/0x8a0 [ 45.216965] ? __flush_work+0x74c/0x8a0 [ 45.220923] ? insert_work+0x3a0/0x3a0 [ 45.224794] ? mark_held_locks+0xa4/0xf0 [ 45.228838] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.234372] ? refcount_sub_and_test_checked+0x154/0x200 [ 45.239806] ? refcount_dec_not_one+0x1f0/0x1f0 [ 45.244461] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 45.250593] flush_work+0x18/0x20 [ 45.254027] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 45.259206] drm_atomic_state_default_clear+0x37c/0xd60 [ 45.264555] drm_atomic_state_clear+0x9d/0xc0 [ 45.269031] __drm_atomic_state_free+0x3c/0xf0 [ 45.273603] drm_atomic_helper_set_config+0xe5/0x160 [ 45.278692] drm_mode_setcrtc+0x613/0x1490 [ 45.282918] ? drm_mode_getcrtc+0x870/0x870 [ 45.287227] ? drm_dev_exit+0x22/0x60 [ 45.291012] ? find_held_lock+0x35/0x130 [ 45.295057] ? drm_dev_exit+0x22/0x60 [ 45.298850] ? drm_lease_owner+0x45/0x60 [ 45.302892] ? drm_is_current_master+0x5c/0x140 [ 45.307554] drm_ioctl_kernel+0x23b/0x2e0 [ 45.311686] ? drm_mode_getcrtc+0x870/0x870 [ 45.315990] ? drm_setversion+0x8c0/0x8c0 [ 45.320126] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.325646] ? _copy_from_user+0xdd/0x150 [ 45.329781] drm_ioctl+0x545/0xa50 [ 45.333304] ? drm_mode_getcrtc+0x870/0x870 [ 45.337614] ? drm_version+0x3d0/0x3d0 [ 45.341482] ? smack_log+0x415/0x540 [ 45.345191] ? debug_check_no_obj_freed+0x200/0x464 [ 45.350198] ? smk_tskacc+0x2ba/0x390 [ 45.353978] ? drm_version+0x3d0/0x3d0 [ 45.357850] do_vfs_ioctl+0xd6e/0x1390 [ 45.361719] ? smk_curacc+0x7f/0xa0 [ 45.365325] ? ioctl_preallocate+0x210/0x210 [ 45.369714] ? smack_file_ioctl+0x196/0x300 [ 45.374022] ? smack_file_lock+0x240/0x240 [ 45.378259] ? rcu_read_lock_sched_held+0x110/0x130 [ 45.383254] ? kmem_cache_free+0x1d1/0x260 [ 45.387471] ? do_sys_open+0x31d/0x5d0 [ 45.391340] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.396858] ? security_file_ioctl+0x93/0xc0 [ 45.401249] ksys_ioctl+0xab/0xd0 [ 45.404682] __x64_sys_ioctl+0x73/0xb0 [ 45.408557] do_syscall_64+0x103/0x610 [ 45.412428] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.417613] RIP: 0033:0x443de9 [ 45.420785] 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 [ 45.439666] RSP: 002b:00007ffeef28aff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 45.447353] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443de9 [ 45.454617] RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003 [ 45.461869] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 45.469116] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401af0 [ 45.476363] R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 [ 45.484470] Kernel Offset: disabled [ 45.488175] Rebooting in 86400 seconds..