[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[ 38.757742] audit: type=1800 audit(1575848467.969:32): pid=7420 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.296966] audit: type=1800 audit(1575848468.499:33): pid=7420 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 Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.801094] kauditd_printk_skb: 2 callbacks suppressed [ 48.801109] audit: type=1400 audit(1575848478.009:36): avc: denied { map } for pid=7608 comm="syz-executor102" path="/root/syz-executor102309499" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 48.805912] BUG: unable to handle kernel NULL pointer dereference at 0000000000000003 [ 48.840612] PGD a9122067 P4D a9122067 PUD a8576067 PMD 0 [ 48.846141] Oops: 0002 [#1] PREEMPT SMP KASAN [ 48.850619] CPU: 1 PID: 7608 Comm: syz-executor102 Not tainted 4.19.88-syzkaller #0 [ 48.858391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.867752] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 48.872527] Code: b6 8d e1 00 00 00 49 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5d 40 <66> 44 89 23 5b 41 5c 41 5d 5d c3 e8 24 6c f1 fd eb c2 e8 7d 6c f1 [ 48.891413] RSP: 0018:ffff88808f0ef850 EFLAGS: 00010206 [ 48.896756] RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 48.904006] RDX: 1ffffffff16da3f7 RSI: ffffffff83b165a6 RDI: ffffffff8b6d1fb8 [ 48.911258] RBP: ffff88808f0ef868 R08: ffff888082762300 R09: ffffed101480a1d6 [ 48.918509] R10: ffffed101480a1d5 R11: ffff8880a4050eab R12: 00000000000000bf [ 48.925770] R13: ffffffff8b6d1f78 R14: 000000000000000a R15: ffffffff8b6d1fc8 [ 48.933038] FS: 00000000023d5880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 48.941246] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.947125] CR2: 0000000000000003 CR3: 000000008b54f000 CR4: 00000000001406e0 [ 48.954379] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.961649] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.968901] Call Trace: [ 48.971478] serial8250_do_startup+0x1366/0x1fe0 [ 48.976230] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.984874] ? trace_hardirqs_on+0x67/0x220 [ 48.989194] serial8250_startup+0x62/0x80 [ 48.993342] uart_startup.part.0+0x491/0x980 [ 48.997786] ? uart_put_char+0x530/0x530 [ 49.001843] ? serial8250_request_std_resource+0x159/0x3d0 [ 49.007559] ? serial8250_probe+0x690/0x690 [ 49.011874] ? serial8250_request_port+0x16/0x20 [ 49.016670] uart_ioctl+0x15ec/0x2a60 [ 49.020471] ? uart_port_activate+0x230/0x230 [ 49.025001] ? __might_fault+0x12b/0x1e0 [ 49.029054] ? uart_port_activate+0x230/0x230 [ 49.033540] tty_ioctl+0x7f3/0x1510 [ 49.037188] ? tty_vhangup+0x30/0x30 [ 49.040892] ? find_held_lock+0x35/0x130 [ 49.044948] ? debug_check_no_obj_freed+0x200/0x464 [ 49.049964] ? __might_sleep+0x95/0x190 [ 49.053974] ? trace_hardirqs_off+0x62/0x220 [ 49.058376] ? tty_vhangup+0x30/0x30 [ 49.062149] do_vfs_ioctl+0xd5f/0x1380 [ 49.066071] ? selinux_file_ioctl+0x46f/0x5e0 [ 49.070554] ? selinux_file_ioctl+0x125/0x5e0 [ 49.075043] ? ioctl_preallocate+0x210/0x210 [ 49.079445] ? selinux_file_mprotect+0x620/0x620 [ 49.084195] ? kmem_cache_free+0x222/0x260 [ 49.088419] ? do_sys_open+0x31d/0x550 [ 49.092302] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.097830] ? security_file_ioctl+0x8d/0xc0 [ 49.102417] ksys_ioctl+0xab/0xd0 [ 49.105854] __x64_sys_ioctl+0x73/0xb0 [ 49.109993] do_syscall_64+0xfd/0x620 [ 49.113785] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.118965] RIP: 0033:0x440219 [ 49.122146] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 49.141089] RSP: 002b:00007ffe9d6c5098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 49.148782] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 49.156048] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 49.163351] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.170607] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 49.177859] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 49.185116] Modules linked in: [ 49.188300] CR2: 0000000000000003 [ 49.192070] ---[ end trace cdd6b5a08a10a8ff ]--- [ 49.196839] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 49.201629] Code: b6 8d e1 00 00 00 49 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5d 40 <66> 44 89 23 5b 41 5c 41 5d 5d c3 e8 24 6c f1 fd eb c2 e8 7d 6c f1 [ 49.220812] RSP: 0018:ffff88808f0ef850 EFLAGS: 00010206 [ 49.226195] RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 49.233486] RDX: 1ffffffff16da3f7 RSI: ffffffff83b165a6 RDI: ffffffff8b6d1fb8 [ 49.240800] RBP: ffff88808f0ef868 R08: ffff888082762300 R09: ffffed101480a1d6 [ 49.248081] R10: ffffed101480a1d5 R11: ffff8880a4050eab R12: 00000000000000bf [ 49.255341] R13: ffffffff8b6d1f78 R14: 000000000000000a R15: ffffffff8b6d1fc8 [ 49.262714] FS: 00000000023d5880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 49.270962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.276833] CR2: 0000000000000003 CR3: 000000008b54f000 CR4: 00000000001406e0 [ 49.284138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.291458] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.298750] Kernel panic - not syncing: Fatal exception [ 49.305426] Kernel Offset: disabled [ 49.309051] Rebooting in 86400 seconds..