[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 70.381068][ T27] audit: type=1800 audit(1576541191.420:25): pid=8991 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 70.400945][ T27] audit: type=1800 audit(1576541191.420:26): pid=8991 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 70.458854][ T27] audit: type=1800 audit(1576541191.420:27): pid=8991 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 '10.128.0.195' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.046191][ T9142] BUG: unable to handle page fault for address: 000000010000000e [ 81.046199][ T9142] #PF: supervisor write access in kernel mode [ 81.046205][ T9142] #PF: error_code(0x0002) - not-present page [ 81.046210][ T9142] PGD a3f7c067 P4D a3f7c067 PUD 0 [ 81.046230][ T9142] Oops: 0002 [#1] PREEMPT SMP KASAN [ 81.046245][ T9142] CPU: 1 PID: 9142 Comm: syz-executor697 Not tainted 5.5.0-rc1-syzkaller #0 [ 81.046252][ T9142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.046274][ T9142] RIP: 0010:insert_char+0x23d/0x400 [ 81.046287][ T9142] 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 [ 81.046293][ T9142] RSP: 0018:ffffc90001d37848 EFLAGS: 00010202 [ 81.046303][ T9142] RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 [ 81.046312][ T9142] RDX: 1ffff11012963679 RSI: 000000010000000e RDI: 000000010000000e [ 81.046320][ T9142] RBP: ffffc90001d37890 R08: ffff8880a0294540 R09: ffff8880a0294dd0 [ 81.046328][ T9142] R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000 [ 81.046336][ T9142] R13: ffff888094b1b000 R14: ffff888094b1b334 R15: 000000010000000e [ 81.046347][ T9142] FS: 0000000000000000(0000) GS:ffff8880ae900000(0063) knlGS:000000000a046840 [ 81.046355][ T9142] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 81.046363][ T9142] CR2: 000000010000000e CR3: 0000000094593000 CR4: 00000000001406e0 [ 81.046374][ T9142] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.046380][ T9142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.046383][ T9142] Call Trace: [ 81.046400][ T9142] do_con_trol+0x41a6/0x61b0 [ 81.046416][ T9142] ? reset_palette+0x190/0x190 [ 81.046432][ T9142] ? __kasan_check_read+0x11/0x20 [ 81.046450][ T9142] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 81.046468][ T9142] do_con_write.part.0+0xfd9/0x1ef0 [ 81.046487][ T9142] ? do_con_trol+0x61b0/0x61b0 [ 81.046503][ T9142] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.046520][ T9142] ? add_wait_queue+0x112/0x170 [ 81.046532][ T9142] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.046548][ T9142] ? trace_hardirqs_on+0x67/0x240 [ 81.046564][ T9142] con_write+0x46/0xd0 [ 81.046580][ T9142] n_tty_write+0x40e/0x1080 [ 81.046600][ T9142] ? n_tty_read+0x1bf0/0x1bf0 [ 81.046613][ T9142] ? prepare_to_wait_exclusive+0x320/0x320 [ 81.046629][ T9142] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.046644][ T9142] ? _copy_from_user+0x12c/0x1a0 [ 81.046657][ T9142] tty_write+0x496/0x7f0 [ 81.046670][ T9142] ? n_tty_read+0x1bf0/0x1bf0 [ 81.046686][ T9142] __vfs_write+0x8a/0x110 [ 81.046696][ T9142] ? put_tty_driver+0x20/0x20 [ 81.046708][ T9142] vfs_write+0x268/0x5d0 [ 81.046721][ T9142] ksys_write+0x14f/0x290 [ 81.046734][ T9142] ? __ia32_sys_read+0xb0/0xb0 [ 81.046750][ T9142] ? do_fast_syscall_32+0xd1/0xe16 [ 81.046762][ T9142] ? entry_SYSENTER_compat+0x70/0x7f [ 81.046775][ T9142] ? do_fast_syscall_32+0xd1/0xe16 [ 81.046789][ T9142] __ia32_sys_write+0x71/0xb0 [ 81.046803][ T9142] do_fast_syscall_32+0x27b/0xe16 [ 81.046817][ T9142] entry_SYSENTER_compat+0x70/0x7f [ 81.046826][ T9142] RIP: 0023:0xf7f11a39 [ 81.046839][ T9142] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 81.046845][ T9142] RSP: 002b:00000000ffab6d2c EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 81.046856][ T9142] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000 [ 81.046871][ T9142] RDX: 0000000000000078 RSI: 00000000080eb080 RDI: 00000000ffab6d80 [ 81.046878][ T9142] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 81.046885][ T9142] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 81.046892][ T9142] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 81.046902][ T9142] Modules linked in: [ 81.046913][ T9142] CR2: 000000010000000e [ 81.046926][ T9142] ---[ end trace b14af07974085d2b ]--- [ 81.046941][ T9142] RIP: 0010:insert_char+0x23d/0x400 [ 81.046952][ T9142] 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 [ 81.046965][ T9142] RSP: 0018:ffffc90001d37848 EFLAGS: 00010202 [ 81.046975][ T9142] RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 [ 81.046983][ T9142] RDX: 1ffff11012963679 RSI: 000000010000000e RDI: 000000010000000e [ 81.046992][ T9142] RBP: ffffc90001d37890 R08: ffff8880a0294540 R09: ffff8880a0294dd0 [ 81.047000][ T9142] R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000 [ 81.047012][ T9142] R13: ffff888094b1b000 R14: ffff888094b1b334 R15: 000000010000000e [ 81.047023][ T9142] FS: 0000000000000000(0000) GS:ffff8880ae900000(0063) knlGS:000000000a046840 [ 81.047032][ T9142] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 81.047040][ T9142] CR2: 000000010000000e CR3: 0000000094593000 CR4: 00000000001406e0 [ 81.047049][ T9142] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.047057][ T9142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.047064][ T9142] Kernel panic - not syncing: Fatal exception [ 81.048414][ T9142] Kernel Offset: disabled [ 81.560381][ T9142] Rebooting in 86400 seconds..