[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 92.701548][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 92.701562][ T27] audit: type=1800 audit(1579486191.526:29): pid=9723 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 92.730191][ T27] audit: type=1800 audit(1579486191.526:30): pid=9723 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.103' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 111.422275][ T9876] BUG: unable to handle page fault for address: 000000010000000e [ 111.422285][ T9876] #PF: supervisor write access in kernel mode [ 111.422292][ T9876] #PF: error_code(0x0002) - not-present page [ 111.422297][ T9876] PGD 93286067 P4D 93286067 PUD 0 [ 111.422317][ T9876] Oops: 0002 [#1] PREEMPT SMP KASAN [ 111.422331][ T9876] CPU: 0 PID: 9876 Comm: syz-executor530 Not tainted 5.5.0-rc6-syzkaller #0 [ 111.422339][ T9876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.422360][ T9876] RIP: 0010:do_con_trol+0x47ea/0x61b0 [ 111.422374][ T9876] Code: 08 2c 01 0f 8e b1 00 00 00 4c 8b bd 08 ff ff ff 48 63 db 44 89 e9 41 0f b7 84 24 c8 03 00 00 48 01 db d1 e9 49 01 df 4c 89 ff 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 [ 111.422382][ T9876] RSP: 0018:ffffc900021c78a0 EFLAGS: 00010202 [ 111.422392][ T9876] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 111.422401][ T9876] RDX: 1ffff110146a7c79 RSI: ffffffff83ed584d RDI: 000000010000000e [ 111.422419][ T9876] RBP: ffffc900021c79c0 R08: ffff888097d84340 R09: ffff888097d84bd0 [ 111.422428][ T9876] R10: fffffbfff14f6998 R11: ffffffff8a7b4cc7 R12: ffff8880a353e000 [ 111.422436][ T9876] R13: 0000000000000002 R14: 0000000000000001 R15: 000000010000000e [ 111.422447][ T9876] FS: 0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:0000000009c31840 [ 111.422456][ T9876] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 111.422464][ T9876] CR2: 000000010000000e CR3: 0000000094839000 CR4: 00000000001406f0 [ 111.422477][ T9876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 111.422484][ T9876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 111.422489][ T9876] Call Trace: [ 111.422510][ T9876] ? reset_palette+0x190/0x190 [ 111.422524][ T9876] ? __kasan_check_read+0x11/0x20 [ 111.422543][ T9876] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 111.422561][ T9876] do_con_write.part.0+0xfd9/0x1ef0 [ 111.422585][ T9876] ? do_con_trol+0x61b0/0x61b0 [ 111.422599][ T9876] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 111.422611][ T9876] ? add_wait_queue+0x112/0x170 [ 111.422624][ T9876] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 111.422642][ T9876] ? trace_hardirqs_on+0x67/0x240 [ 111.422661][ T9876] con_write+0x46/0xd0 [ 111.422678][ T9876] n_tty_write+0x40e/0x1080 [ 111.422701][ T9876] ? n_tty_read+0x1bf0/0x1bf0 [ 111.422716][ T9876] ? prepare_to_wait_exclusive+0x320/0x320 [ 111.422734][ T9876] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 111.422750][ T9876] ? _copy_from_user+0x12c/0x1a0 [ 111.422766][ T9876] tty_write+0x496/0x7f0 [ 111.422784][ T9876] ? n_tty_read+0x1bf0/0x1bf0 [ 111.422800][ T9876] __vfs_write+0x8a/0x110 [ 111.422814][ T9876] ? put_tty_driver+0x20/0x20 [ 111.422828][ T9876] vfs_write+0x268/0x5d0 [ 111.422844][ T9876] ksys_write+0x14f/0x290 [ 111.422859][ T9876] ? __ia32_sys_read+0xb0/0xb0 [ 111.422884][ T9876] ? do_fast_syscall_32+0xd1/0xe16 [ 111.422899][ T9876] ? entry_SYSENTER_compat+0x70/0x7f [ 111.422913][ T9876] ? do_fast_syscall_32+0xd1/0xe16 [ 111.422930][ T9876] __ia32_sys_write+0x71/0xb0 [ 111.422947][ T9876] do_fast_syscall_32+0x27b/0xe16 [ 111.422964][ T9876] entry_SYSENTER_compat+0x70/0x7f [ 111.422974][ T9876] RIP: 0023:0xf7f599a9 [ 111.422987][ T9876] 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 [ 111.422994][ T9876] RSP: 002b:00000000ffe7970c EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 111.423007][ T9876] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000 [ 111.423015][ T9876] RDX: 0000000000000078 RSI: 00000000080eb080 RDI: 00000000ffe79760 [ 111.423022][ T9876] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 111.423030][ T9876] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 111.423037][ T9876] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 111.423049][ T9876] Modules linked in: [ 111.423057][ T9876] CR2: 000000010000000e [ 111.423067][ T9876] ---[ end trace f9c18e796b19c796 ]--- [ 111.423082][ T9876] RIP: 0010:do_con_trol+0x47ea/0x61b0 [ 111.423095][ T9876] Code: 08 2c 01 0f 8e b1 00 00 00 4c 8b bd 08 ff ff ff 48 63 db 44 89 e9 41 0f b7 84 24 c8 03 00 00 48 01 db d1 e9 49 01 df 4c 89 ff 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 [ 111.423102][ T9876] RSP: 0018:ffffc900021c78a0 EFLAGS: 00010202 [ 111.423112][ T9876] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 111.423120][ T9876] RDX: 1ffff110146a7c79 RSI: ffffffff83ed584d RDI: 000000010000000e [ 111.423127][ T9876] RBP: ffffc900021c79c0 R08: ffff888097d84340 R09: ffff888097d84bd0 [ 111.423135][ T9876] R10: fffffbfff14f6998 R11: ffffffff8a7b4cc7 R12: ffff8880a353e000 [ 111.423142][ T9876] R13: 0000000000000002 R14: 0000000000000001 R15: 000000010000000e [ 111.423153][ T9876] FS: 0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:0000000009c31840 [ 111.423162][ T9876] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 111.423170][ T9876] CR2: 000000010000000e CR3: 0000000094839000 CR4: 00000000001406f0 [ 111.423179][ T9876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 111.423186][ T9876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 111.423192][ T9876] Kernel panic - not syncing: Fatal exception [ 111.425014][ T9876] Kernel Offset: disabled [ 111.939303][ T9876] Rebooting in 86400 seconds..