[ 33.895612] audit: type=1800 audit(1576772797.394:33): pid=6980 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 [ 33.922679] audit: type=1800 audit(1576772797.394:34): pid=6980 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 38.233090] random: sshd: uninitialized urandom read (32 bytes read) [ 38.466936] audit: type=1400 audit(1576772801.964:35): avc: denied { map } for pid=7154 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 [ 38.509787] random: sshd: uninitialized urandom read (32 bytes read) [ 39.114722] random: sshd: uninitialized urandom read (32 bytes read) [ 39.303616] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts. [ 44.841439] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 44.964430] audit: type=1400 audit(1576772808.464:36): avc: denied { map } for pid=7166 comm="syz-executor990" path="/root/syz-executor990896443" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 44.969390] BUG: unable to handle kernel NULL pointer dereference at 0000000000000002 [ 44.998639] IP: mem16_serial_out+0x6c/0x90 [ 45.002874] PGD 9f96a067 P4D 9f96a067 PUD a8a6a067 PMD 0 [ 45.008401] Oops: 0002 [#1] PREEMPT SMP KASAN [ 45.012871] Modules linked in: [ 45.016044] CPU: 1 PID: 7166 Comm: syz-executor990 Not tainted 4.14.159-syzkaller #0 [ 45.023918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.033280] task: ffff8880998de680 task.stack: ffff888095460000 [ 45.039320] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 45.044050] RSP: 0018:ffff888095467968 EFLAGS: 00010202 [ 45.049402] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 45.056653] RDX: 1ffffffff14911c2 RSI: 0000000000000002 RDI: ffffffff8a488e10 [ 45.063987] RBP: ffff888095467980 R08: ffff8880998de680 R09: ffff8880998def48 [ 45.071236] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 45.079022] R13: ffffffff8a488dd0 R14: ffffffff8a488f10 R15: ffff8880a4410ef8 [ 45.086278] FS: 0000000001526880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 45.094499] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.100361] CR2: 0000000000000002 CR3: 000000007f2e3000 CR4: 00000000001406e0 [ 45.107612] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.114865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.122117] Call Trace: [ 45.124710] serial8250_clear_fifos.part.0+0x3a/0xb0 [ 45.129816] serial8250_do_startup+0x3bb/0x1d20 [ 45.134484] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 45.139597] serial8250_startup+0x5c/0x80 [ 45.143743] uart_startup.part.0+0x2e0/0x710 [ 45.148136] uart_ioctl+0x12e9/0x2600 [ 45.151940] ? uart_port_activate+0x200/0x200 [ 45.156422] ? __might_fault+0x110/0x1d0 [ 45.160466] ? uart_port_activate+0x200/0x200 [ 45.164940] tty_ioctl+0x841/0x1320 [ 45.168545] ? tty_vhangup+0x30/0x30 [ 45.172238] ? __might_sleep+0x93/0xb0 [ 45.176105] ? tty_vhangup+0x30/0x30 [ 45.179796] do_vfs_ioctl+0x7ae/0x1060 [ 45.183680] ? selinux_file_mprotect+0x5d0/0x5d0 [ 45.188416] ? kmem_cache_free+0x244/0x2b0 [ 45.192631] ? ioctl_preallocate+0x1c0/0x1c0 [ 45.197100] ? putname+0xe0/0x120 [ 45.200532] ? do_sys_open+0x221/0x430 [ 45.204485] ? security_file_ioctl+0x7d/0xb0 [ 45.208879] ? security_file_ioctl+0x89/0xb0 [ 45.213275] SyS_ioctl+0x8f/0xc0 [ 45.216661] ? do_vfs_ioctl+0x1060/0x1060 [ 45.220796] do_syscall_64+0x1e8/0x640 [ 45.224660] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.229490] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 45.234670] RIP: 0033:0x440219 [ 45.237836] RSP: 002b:00007ffee4d30d28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 45.245520] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 45.253213] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 45.260463] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 45.267713] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 45.274980] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 45.282242] Code: 0f b6 8d d1 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 d4 54 37 fe eb c2 e8 2d 55 [ 45.301329] RIP: mem16_serial_out+0x6c/0x90 RSP: ffff888095467968 [ 45.307544] CR2: 0000000000000002 [ 45.311951] ---[ end trace 119d5d25b4f8be82 ]--- [ 45.316700] Kernel panic - not syncing: Fatal exception [ 45.322780] Kernel Offset: disabled [ 45.326400] Rebooting in 86400 seconds..