[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.351733][ T27] audit: type=1800 audit(1579454133.038:25): pid=8532 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.382408][ T27] audit: type=1800 audit(1579454133.038:26): pid=8532 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.433514][ T27] audit: type=1800 audit(1579454133.038:27): pid=8532 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.609267][ T8686] BUG: unable to handle page fault for address: 000000010000000e [ 69.609273][ T8686] #PF: supervisor write access in kernel mode [ 69.609278][ T8686] #PF: error_code(0x0002) - not-present page [ 69.609282][ T8686] PGD a98de067 P4D a98de067 PUD 0 [ 69.609295][ T8686] Oops: 0002 [#1] PREEMPT SMP KASAN [ 69.609305][ T8686] CPU: 0 PID: 8686 Comm: syz-executor679 Not tainted 5.5.0-rc6-syzkaller #0 [ 69.609310][ T8686] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.609323][ T8686] RIP: 0010:do_con_write+0x9f72/0xf360 [ 69.609331][ T8686] Code: 00 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 10 44 00 00 48 8b 84 24 a0 00 00 00 0f b7 00 44 89 f9 81 e1 ff ff ff 7f 4c 89 f7 66 ab 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 50 8a 04 01 84 [ 69.609335][ T8686] RSP: 0018:ffffc900021f7880 EFLAGS: 00010202 [ 69.609341][ T8686] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 69.609346][ T8686] RDX: 0000000000000000 RSI: ffffffff89239ed0 RDI: 000000010000000e [ 69.609350][ T8686] RBP: ffffc900021f7b68 R08: 0000000000000005 R09: ffffffff83fa1e48 [ 69.609355][ T8686] R10: ffff8880a274c1c0 R11: 0000000000000003 R12: 0000000000000000 [ 69.609360][ T8686] R13: dffffc0000000000 R14: 000000010000000e R15: 0000000000000001 [ 69.609366][ T8686] FS: 0000000001545880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 69.609371][ T8686] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.609375][ T8686] CR2: 000000010000000e CR3: 0000000097629000 CR4: 00000000001406f0 [ 69.609385][ T8686] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.609389][ T8686] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.609392][ T8686] Call Trace: [ 69.609430][ T8686] ? _raw_spin_unlock_irqrestore+0x72/0xe0 [ 69.609443][ T8686] ? _raw_spin_unlock_irqrestore+0xb7/0xe0 [ 69.609452][ T8686] con_write+0x25/0x40 [ 69.609462][ T8686] n_tty_write+0xd0c/0x1200 [ 69.609479][ T8686] ? wait_woken+0x230/0x230 [ 69.609489][ T8686] tty_write+0x5a1/0x950 [ 69.609498][ T8686] ? n_tty_read+0x1bc0/0x1bc0 [ 69.609508][ T8686] ? redirected_tty_write+0xb0/0xb0 [ 69.609520][ T8686] __vfs_write+0xb8/0x740 [ 69.609534][ T8686] ? security_file_permission+0x147/0x340 [ 69.609545][ T8686] ? rw_verify_area+0x1c2/0x360 [ 69.609557][ T8686] vfs_write+0x270/0x580 [ 69.609568][ T8686] ksys_write+0x117/0x220 [ 69.609579][ T8686] __x64_sys_write+0x7b/0x90 [ 69.609590][ T8686] do_syscall_64+0xf7/0x1c0 [ 69.609602][ T8686] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.609608][ T8686] RIP: 0033:0x4404f9 [ 69.609615][ T8686] 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.609619][ T8686] RSP: 002b:00007ffcc98f9338 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 69.609627][ T8686] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 69.609631][ T8686] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 69.609636][ T8686] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 69.609641][ T8686] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 69.609647][ T8686] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 69.609657][ T8686] Modules linked in: [ 69.609664][ T8686] CR2: 000000010000000e [ 69.609674][ T8686] ---[ end trace f08a62f87bf81d1c ]--- [ 69.609683][ T8686] RIP: 0010:do_con_write+0x9f72/0xf360 [ 69.609691][ T8686] Code: 00 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 10 44 00 00 48 8b 84 24 a0 00 00 00 0f b7 00 44 89 f9 81 e1 ff ff ff 7f 4c 89 f7 66 ab 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 50 8a 04 01 84 [ 69.609695][ T8686] RSP: 0018:ffffc900021f7880 EFLAGS: 00010202 [ 69.609702][ T8686] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 69.609707][ T8686] RDX: 0000000000000000 RSI: ffffffff89239ed0 RDI: 000000010000000e [ 69.609711][ T8686] RBP: ffffc900021f7b68 R08: 0000000000000005 R09: ffffffff83fa1e48 [ 69.609716][ T8686] R10: ffff8880a274c1c0 R11: 0000000000000003 R12: 0000000000000000 [ 69.609720][ T8686] R13: dffffc0000000000 R14: 000000010000000e R15: 0000000000000001 [ 69.609727][ T8686] FS: 0000000001545880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 69.609733][ T8686] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.609738][ T8686] CR2: 000000010000000e CR3: 0000000097629000 CR4: 00000000001406f0 [ 69.609744][ T8686] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.609749][ T8686] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.609754][ T8686] Kernel panic - not syncing: Fatal exception [ 69.611215][ T8686] Kernel Offset: disabled [ 70.057507][ T8686] Rebooting in 86400 seconds..