[?25l[?1c7[ ok 8[?25h[?0c. [....] 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 70.468883][ T26] kauditd_printk_skb: 8 callbacks suppressed [ 70.468896][ T26] audit: type=1400 audit(1575684706.401:41): avc: denied { map } for pid=9675 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 '10.128.0.91' (ECDSA) to the list of known hosts. executing program [ 76.960423][ T26] audit: type=1400 audit(1575684712.891:42): avc: denied { map } for pid=9687 comm="syz-executor433" path="/root/syz-executor433542180" 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 [ 76.966357][ T9687] BUG: kernel NULL pointer dereference, address: 0000000000000002 [ 76.995153][ T9687] #PF: supervisor write access in kernel mode [ 77.001191][ T9687] #PF: error_code(0x0002) - not-present page [ 77.007176][ T9687] PGD 9764a067 P4D 9764a067 PUD 9f995067 PMD 0 [ 77.013396][ T9687] Oops: 0002 [#1] PREEMPT SMP KASAN [ 77.018612][ T9687] CPU: 0 PID: 9687 Comm: syz-executor433 Not tainted 5.4.0-syzkaller #0 [ 77.026908][ T9687] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.036946][ T9687] RIP: 0010:mem_serial_out+0x70/0x90 [ 77.042205][ T9687] Code: e9 00 00 00 49 8d 7c 24 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 5c 24 40 <44> 88 2b 5b 41 5c 41 5d 5d c3 e8 81 ed cf fd eb c0 e8 da ed cf fd [ 77.061786][ T9687] RSP: 0018:ffffc90001de78e8 EFLAGS: 00010202 [ 77.067826][ T9687] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 77.075772][ T9687] RDX: 1ffffffff181f40e RSI: ffffffff83e28776 RDI: ffffffff8c0fa070 [ 77.083721][ T9687] RBP: ffffc90001de7900 R08: ffff8880919dc340 R09: ffffed10431ee1c6 [ 77.091667][ T9687] R10: ffffed10431ee1c5 R11: ffff888218f70e2b R12: ffffffff8c0fa030 [ 77.099615][ T9687] R13: 0000000000000001 R14: ffffc90001de7a40 R15: ffffffff8c0fa188 [ 77.107562][ T9687] FS: 0000000001060880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 77.116476][ T9687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.123033][ T9687] CR2: 0000000000000002 CR3: 000000009e6b8000 CR4: 00000000001406f0 [ 77.130990][ T9687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.138941][ T9687] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.146891][ T9687] Call Trace: [ 77.150167][ T9687] serial8250_clear_fifos.part.0+0x3a/0xb0 [ 77.155954][ T9687] serial8250_do_startup+0x426/0x1cf0 [ 77.161328][ T9687] serial8250_startup+0x62/0x80 [ 77.166155][ T9687] uart_startup+0x452/0x980 [ 77.170634][ T9687] ? uart_proc_show+0x13f0/0x13f0 [ 77.175635][ T9687] ? serial8250_request_std_resource+0x159/0x3d0 [ 77.181978][ T9687] ? serial8250_probe+0x680/0x680 [ 77.186981][ T9687] ? serial8250_request_port+0x16/0x20 [ 77.192417][ T9687] uart_set_info_user+0x13b4/0x1cf0 [ 77.197592][ T9687] ? uart_port_activate+0x200/0x200 [ 77.202768][ T9687] tty_ioctl+0xf60/0x14f0 [ 77.207074][ T9687] ? tty_vhangup+0x30/0x30 [ 77.211466][ T9687] ? tomoyo_path_number_perm+0x454/0x520 [ 77.217075][ T9687] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 77.223292][ T9687] ? ___might_sleep+0x163/0x2c0 [ 77.228132][ T9687] ? tty_vhangup+0x30/0x30 [ 77.232524][ T9687] do_vfs_ioctl+0x977/0x14e0 [ 77.237088][ T9687] ? compat_ioctl_preallocate+0x220/0x220 [ 77.242799][ T9687] ? selinux_file_mprotect+0x620/0x620 [ 77.248238][ T9687] ? kmem_cache_free+0x26b/0x320 [ 77.253149][ T9687] ? do_sys_open+0x31d/0x5d0 [ 77.257717][ T9687] ? tomoyo_file_ioctl+0x23/0x30 [ 77.262632][ T9687] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.268849][ T9687] ? security_file_ioctl+0x8d/0xc0 [ 77.273934][ T9687] ksys_ioctl+0xab/0xd0 [ 77.278068][ T9687] __x64_sys_ioctl+0x73/0xb0 [ 77.282637][ T9687] do_syscall_64+0xfa/0x790 [ 77.287115][ T9687] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.292981][ T9687] RIP: 0033:0x440219 [ 77.296852][ T9687] 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 [ 77.316428][ T9687] RSP: 002b:00007ffced648c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 77.324815][ T9687] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 77.332776][ T9687] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 77.340720][ T9687] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 77.348668][ T9687] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 77.356614][ T9687] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 77.364562][ T9687] Modules linked in: [ 77.368431][ T9687] CR2: 0000000000000002 [ 77.373339][ T9687] ---[ end trace eaa11ffe82f3a763 ]--- [ 77.378950][ T9687] RIP: 0010:mem_serial_out+0x70/0x90 [ 77.384217][ T9687] Code: e9 00 00 00 49 8d 7c 24 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 5c 24 40 <44> 88 2b 5b 41 5c 41 5d 5d c3 e8 81 ed cf fd eb c0 e8 da ed cf fd [ 77.403829][ T9687] RSP: 0018:ffffc90001de78e8 EFLAGS: 00010202 [ 77.409927][ T9687] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 77.417894][ T9687] RDX: 1ffffffff181f40e RSI: ffffffff83e28776 RDI: ffffffff8c0fa070 [ 77.425892][ T9687] RBP: ffffc90001de7900 R08: ffff8880919dc340 R09: ffffed10431ee1c6 [ 77.433875][ T9687] R10: ffffed10431ee1c5 R11: ffff888218f70e2b R12: ffffffff8c0fa030 [ 77.441869][ T9687] R13: 0000000000000001 R14: ffffc90001de7a40 R15: ffffffff8c0fa188 [ 77.449869][ T9687] FS: 0000000001060880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 77.458855][ T9687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.465434][ T9687] CR2: 0000000000000002 CR3: 000000009e6b8000 CR4: 00000000001406f0 [ 77.473435][ T9687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.481432][ T9687] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.489410][ T9687] Kernel panic - not syncing: Fatal exception [ 77.496804][ T9687] Kernel Offset: disabled [ 77.501138][ T9687] Rebooting in 86400 seconds..