[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.921264][ T27] audit: type=1800 audit(1576545115.207:25): pid=8802 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.941435][ T27] audit: type=1800 audit(1576545115.207:26): pid=8802 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.977640][ T27] audit: type=1800 audit(1576545115.207:27): pid=8802 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.10.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.190584][ T8954] BUG: unable to handle page fault for address: 000000010000000e [ 76.190592][ T8954] #PF: supervisor write access in kernel mode [ 76.190598][ T8954] #PF: error_code(0x0002) - not-present page [ 76.190603][ T8954] PGD a0297067 P4D a0297067 PUD 0 [ 76.190620][ T8954] Oops: 0002 [#1] PREEMPT SMP KASAN [ 76.190633][ T8954] CPU: 1 PID: 8954 Comm: syz-executor069 Not tainted 5.5.0-rc1-syzkaller #0 [ 76.190639][ T8954] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.190656][ T8954] RIP: 0010:insert_char+0x23d/0x400 [ 76.190668][ T8954] Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 [ 76.190675][ T8954] RSP: 0018:ffffc90001d87858 EFLAGS: 00010202 [ 76.190684][ T8954] RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 [ 76.190692][ T8954] RDX: 1ffff11011ed1879 RSI: 000000010000000e RDI: 000000010000000e [ 76.190699][ T8954] RBP: ffffc90001d878a0 R08: ffff88809aaf0180 R09: ffff88809aaf0a10 [ 76.190706][ T8954] R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000 [ 76.190712][ T8954] R13: ffff88808f68c000 R14: ffff88808f68c334 R15: 000000010000000e [ 76.190723][ T8954] FS: 0000000000b30880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 76.190730][ T8954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 76.190736][ T8954] CR2: 000000010000000e CR3: 0000000096506000 CR4: 00000000001406e0 [ 76.190746][ T8954] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 76.190752][ T8954] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 76.190755][ T8954] Call Trace: [ 76.190773][ T8954] do_con_trol+0x41a6/0x61b0 [ 76.190788][ T8954] ? reset_palette+0x190/0x190 [ 76.190801][ T8954] ? __kasan_check_read+0x11/0x20 [ 76.190817][ T8954] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 76.190832][ T8954] do_con_write.part.0+0xfd9/0x1ef0 [ 76.190852][ T8954] ? do_con_trol+0x61b0/0x61b0 [ 76.190866][ T8954] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 76.190876][ T8954] ? add_wait_queue+0x112/0x170 [ 76.190888][ T8954] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 76.190903][ T8954] ? trace_hardirqs_on+0x67/0x240 [ 76.190918][ T8954] con_write+0x46/0xd0 [ 76.190933][ T8954] n_tty_write+0x40e/0x1080 [ 76.190950][ T8954] ? n_tty_read+0x1bf0/0x1bf0 [ 76.190961][ T8954] ? prepare_to_wait_exclusive+0x320/0x320 [ 76.190975][ T8954] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.190985][ T8954] ? _copy_from_user+0x12c/0x1a0 [ 76.190996][ T8954] tty_write+0x496/0x7f0 [ 76.191007][ T8954] ? n_tty_read+0x1bf0/0x1bf0 [ 76.191020][ T8954] __vfs_write+0x8a/0x110 [ 76.191029][ T8954] ? put_tty_driver+0x20/0x20 [ 76.191039][ T8954] vfs_write+0x268/0x5d0 [ 76.191051][ T8954] ksys_write+0x14f/0x290 [ 76.191063][ T8954] ? __ia32_sys_read+0xb0/0xb0 [ 76.191079][ T8954] ? do_syscall_64+0x26/0x790 [ 76.191092][ T8954] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.191104][ T8954] ? do_syscall_64+0x26/0x790 [ 76.191119][ T8954] __x64_sys_write+0x73/0xb0 [ 76.191133][ T8954] do_syscall_64+0xfa/0x790 [ 76.191148][ T8954] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.191157][ T8954] RIP: 0033:0x4404f9 [ 76.191169][ T8954] 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 [ 76.191176][ T8954] RSP: 002b:00007fff33c5bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 76.191187][ T8954] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 76.191195][ T8954] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 76.191202][ T8954] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 76.191210][ T8954] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 76.191217][ T8954] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 76.191228][ T8954] Modules linked in: [ 76.191237][ T8954] CR2: 000000010000000e [ 76.199362][ T8954] ---[ end trace 763703d908dc8dbd ]--- [ 76.199383][ T8954] RIP: 0010:insert_char+0x23d/0x400 [ 76.199396][ T8954] Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 [ 76.199403][ T8954] RSP: 0018:ffffc90001d87858 EFLAGS: 00010202 [ 76.199413][ T8954] RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 [ 76.199421][ T8954] RDX: 1ffff11011ed1879 RSI: 000000010000000e RDI: 000000010000000e [ 76.199430][ T8954] RBP: ffffc90001d878a0 R08: ffff88809aaf0180 R09: ffff88809aaf0a10 [ 76.199438][ T8954] R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000 [ 76.199446][ T8954] R13: ffff88808f68c000 R14: ffff88808f68c334 R15: 000000010000000e [ 76.199457][ T8954] FS: 0000000000b30880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 76.199466][ T8954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 76.199473][ T8954] CR2: 000000000233afd0 CR3: 0000000096506000 CR4: 00000000001406e0 [ 76.199485][ T8954] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 76.199493][ T8954] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 76.199499][ T8954] Kernel panic - not syncing: Fatal exception [ 76.200917][ T8954] Kernel Offset: disabled [ 76.710449][ T8954] Rebooting in 86400 seconds..