[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.584441][ T26] audit: type=1800 audit(1571028056.774:25): pid=8380 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.626480][ T26] audit: type=1800 audit(1571028056.784:26): pid=8380 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.669466][ T26] audit: type=1800 audit(1571028056.784:27): pid=8380 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 '10.128.0.83' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 71.058139][ T3473] check: Corrupted low memory at 00000000b9a95c9f (2900 phys) = 000000e8 [ 71.068116][ T3473] ------------[ cut here ]------------ [ 71.073628][ T3473] Memory corruption detected in low memory [ 71.079837][ T3473] WARNING: CPU: 0 PID: 3473 at arch/x86/kernel/check.c:161 check_corruption+0x159/0x1fc [ 71.089547][ T3473] Kernel panic - not syncing: panic_on_warn set ... [ 71.096117][ T3473] CPU: 0 PID: 3473 Comm: kworker/0:2 Not tainted 5.4.0-rc2-next-20191011 #0 [ 71.104778][ T3473] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.114827][ T3473] Workqueue: events check_corruption [ 71.120089][ T3473] Call Trace: [ 71.123377][ T3473] dump_stack+0x172/0x1f0 [ 71.127706][ T3473] ? check_corruption+0xb0/0x1fc [ 71.132670][ T3473] panic+0x2e3/0x75c [ 71.136554][ T3473] ? add_taint.cold+0x16/0x16 [ 71.141250][ T3473] ? __kasan_check_write+0x14/0x20 [ 71.146350][ T3473] ? __warn.cold+0x14/0x35 [ 71.150749][ T3473] ? __warn+0xd9/0x1d0 [ 71.154822][ T3473] ? check_corruption+0x159/0x1fc [ 71.159835][ T3473] __warn.cold+0x2f/0x35 [ 71.164071][ T3473] ? check_corruption+0x159/0x1fc [ 71.169219][ T3473] report_bug+0x289/0x300 [ 71.173534][ T3473] do_error_trap+0x11b/0x200 [ 71.178109][ T3473] do_invalid_op+0x37/0x50 [ 71.182517][ T3473] ? check_corruption+0x159/0x1fc [ 71.187587][ T3473] invalid_op+0x23/0x30 [ 71.191731][ T3473] RIP: 0010:check_corruption+0x159/0x1fc [ 71.197347][ T3473] Code: 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 3d 8b 00 90 08 00 75 a2 48 c7 c7 e0 6b a8 87 c6 05 7b 00 90 08 01 e8 af 0b 12 00 <0f> 0b eb 8b 48 89 df 89 55 d0 e8 88 45 7c 00 8b 55 d0 e9 4e ff ff [ 71.216993][ T3473] RSP: 0018:ffff88809c8d7cf8 EFLAGS: 00010286 [ 71.223750][ T3473] RAX: 0000000000000000 RBX: ffff888000010000 RCX: 0000000000000000 [ 71.231703][ T3473] RDX: 0000000000000000 RSI: ffffffff815cb3a6 RDI: ffffed101391af91 [ 71.239661][ T3473] RBP: ffff88809c8d7d30 R08: ffff88809c8e2080 R09: ffffed1015d06161 [ 71.247621][ T3473] R10: ffffed1015d06160 R11: ffff8880ae830b07 R12: ffff888000010000 [ 71.255630][ T3473] R13: 0000000000000001 R14: dffffc0000000000 R15: ffff888000000000 [ 71.263653][ T3473] ? vprintk_func+0x86/0x189 [ 71.268231][ T3473] ? check_corruption+0x159/0x1fc [ 71.273242][ T3473] process_one_work+0x9af/0x1740 [ 71.278168][ T3473] ? pwq_dec_nr_in_flight+0x320/0x320 [ 71.283562][ T3473] ? lock_acquire+0x190/0x410 [ 71.288226][ T3473] worker_thread+0x98/0xe40 [ 71.292708][ T3473] ? trace_hardirqs_on+0x67/0x240 [ 71.297875][ T3473] kthread+0x361/0x430 [ 71.301933][ T3473] ? process_one_work+0x1740/0x1740 [ 71.307114][ T3473] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 71.313342][ T3473] ret_from_fork+0x24/0x30 [ 71.319258][ T3473] Kernel Offset: disabled [ 71.323656][ T3473] Rebooting in 86400 seconds..