[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.831767][ T27] audit: type=1800 audit(1579879944.390:25): pid=8537 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.851219][ T27] audit: type=1800 audit(1579879944.400:26): pid=8537 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.871787][ T27] audit: type=1800 audit(1579879944.400:27): pid=8537 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 '10.128.0.43' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 66.462339][ T8704] kasan: CONFIG_KASAN_INLINE enabled [ 66.462357][ T8704] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 66.462369][ T8704] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 66.462377][ T8704] CPU: 1 PID: 8704 Comm: syz-executor811 Not tainted 5.5.0-rc7-syzkaller #0 [ 66.462382][ T8704] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.462394][ T8704] RIP: 0010:do_con_write+0x1aea/0xf360 [ 66.462403][ T8704] Code: 02 00 00 48 8b 7c 24 60 49 89 ff 49 c1 ef 03 43 80 3c 2f 00 74 0a e8 85 fe b8 fd 48 8b 7c 24 60 48 8b 1f 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 ce 02 00 00 66 44 89 33 48 c7 c7 dc 91 [ 66.462407][ T8704] RSP: 0018:ffffc900021b7850 EFLAGS: 00010203 [ 66.462415][ T8704] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffff8880950f8380 [ 66.462420][ T8704] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a06b53a0 [ 66.462425][ T8704] RBP: ffffc900021b7b38 R08: ffffffff83f9bbd8 R09: ffffffff83f7ef74 [ 66.462431][ T8704] R10: ffff8880950f8380 R11: 0000000000000006 R12: ffff8880a06b5000 [ 66.462436][ T8704] R13: dffffc0000000000 R14: 0000000000000764 R15: 1ffff110140d6a74 [ 66.462444][ T8704] FS: 0000000000e68880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 66.462449][ T8704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.462454][ T8704] CR2: 0000000020001440 CR3: 00000000a6f78000 CR4: 00000000001406e0 [ 66.462465][ T8704] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 66.462470][ T8704] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.462473][ T8704] Call Trace: [ 66.462507][ T8704] ? _raw_spin_unlock_irqrestore+0x72/0xe0 [ 66.462518][ T8704] ? _raw_spin_unlock_irqrestore+0xb7/0xe0 [ 66.462526][ T8704] con_write+0x25/0x40 [ 66.462535][ T8704] n_tty_write+0xd0c/0x1200 [ 66.462553][ T8704] ? wait_woken+0x230/0x230 [ 66.462564][ T8704] tty_write+0x5a1/0x950 [ 66.462572][ T8704] ? n_tty_read+0x1bc0/0x1bc0 [ 66.462585][ T8704] do_iter_write+0x43f/0x590 [ 66.462607][ T8704] do_writev+0x239/0x490 [ 66.462622][ T8704] ? do_user_addr_fault+0x654/0xaf0 [ 66.462633][ T8704] ? check_preemption_disabled+0xb4/0x260 [ 66.462641][ T8704] ? debug_smp_processor_id+0x9/0x20 [ 66.462651][ T8704] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 66.462661][ T8704] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 66.462670][ T8704] ? do_syscall_64+0x1d/0x1c0 [ 66.462679][ T8704] __x64_sys_writev+0x7d/0x90 [ 66.462689][ T8704] do_syscall_64+0xf7/0x1c0 [ 66.462699][ T8704] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.462706][ T8704] RIP: 0033:0x441509 [ 66.462714][ T8704] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 66.462718][ T8704] RSP: 002b:00007ffde665fa48 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 66.462726][ T8704] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441509 [ 66.462731][ T8704] RDX: 0000000000000001 RSI: 0000000020001440 RDI: 0000000000000003 [ 66.462737][ T8704] RBP: 00000000006cc018 R08: 000000000000000e R09: 00000000004002c8 [ 66.462742][ T8704] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280 [ 66.462747][ T8704] R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000 [ 66.462756][ T8704] Modules linked in: [ 66.462768][ T8704] ---[ end trace 52cc2dcd4616e103 ]--- [ 66.462778][ T8704] RIP: 0010:do_con_write+0x1aea/0xf360 [ 66.462786][ T8704] Code: 02 00 00 48 8b 7c 24 60 49 89 ff 49 c1 ef 03 43 80 3c 2f 00 74 0a e8 85 fe b8 fd 48 8b 7c 24 60 48 8b 1f 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 ce 02 00 00 66 44 89 33 48 c7 c7 dc 91 [ 66.462791][ T8704] RSP: 0018:ffffc900021b7850 EFLAGS: 00010203 [ 66.462798][ T8704] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffff8880950f8380 [ 66.462804][ T8704] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a06b53a0 [ 66.462809][ T8704] RBP: ffffc900021b7b38 R08: ffffffff83f9bbd8 R09: ffffffff83f7ef74 [ 66.462815][ T8704] R10: ffff8880950f8380 R11: 0000000000000006 R12: ffff8880a06b5000 [ 66.462821][ T8704] R13: dffffc0000000000 R14: 0000000000000764 R15: 1ffff110140d6a74 [ 66.462828][ T8704] FS: 0000000000e68880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 66.462835][ T8704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.462840][ T8704] CR2: 0000000020001440 CR3: 00000000a6f78000 CR4: 00000000001406e0 [ 66.462849][ T8704] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 66.462854][ T8704] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.462859][ T8704] Kernel panic - not syncing: Fatal exception [ 66.464171][ T8704] Kernel Offset: disabled [ 66.909718][ T8704] Rebooting in 86400 seconds..