[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.073027][ T27] audit: type=1800 audit(1571797145.028:25): pid=8477 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.109061][ T27] audit: type=1800 audit(1571797145.028:26): pid=8477 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.131821][ T27] audit: type=1800 audit(1571797145.028:27): pid=8477 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 '10.128.0.62' (ECDSA) to the list of known hosts. 2019/10/23 02:19:17 fuzzer started 2019/10/23 02:19:19 dialing manager at 10.128.0.26:45989 2019/10/23 02:19:19 syscalls: 2525 2019/10/23 02:19:19 code coverage: enabled 2019/10/23 02:19:19 comparison tracing: enabled 2019/10/23 02:19:19 extra coverage: extra coverage is not supported by the kernel 2019/10/23 02:19:19 setuid sandbox: enabled 2019/10/23 02:19:19 namespace sandbox: enabled 2019/10/23 02:19:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 02:19:19 fault injection: enabled 2019/10/23 02:19:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 02:19:19 net packet injection: enabled 2019/10/23 02:19:19 net device setup: enabled 2019/10/23 02:19:19 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 79.993010][ T1081] ------------[ cut here ]------------ [ 79.998655][ T1081] WARNING: CPU: 0 PID: 1081 at mm/khugepaged.c:1643 collapse_file+0x1f9d/0x4170 [ 80.007776][ T1081] Kernel panic - not syncing: panic_on_warn set ... [ 80.014381][ T1081] CPU: 0 PID: 1081 Comm: khugepaged Not tainted 5.4.0-rc4-next-20191022 #0 [ 80.023138][ T1081] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.033191][ T1081] Call Trace: [ 80.036557][ T1081] dump_stack+0x172/0x1f0 [ 80.040888][ T1081] ? collapse_file+0x1ef0/0x4170 [ 80.045890][ T1081] panic+0x2e3/0x75c [ 80.049773][ T1081] ? add_taint.cold+0x16/0x16 [ 80.054605][ T1081] ? printk+0xba/0xed [ 80.058654][ T1081] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 80.064308][ T1081] ? __warn.cold+0x14/0x35 [ 80.069841][ T1081] ? __warn+0xd9/0x1d0 [ 80.073925][ T1081] ? collapse_file+0x1f9d/0x4170 [ 80.078845][ T1081] __warn.cold+0x2f/0x35 [ 80.083167][ T1081] ? report_bug.cold+0x63/0xb2 [ 80.087952][ T1081] ? collapse_file+0x1f9d/0x4170 [ 80.092881][ T1081] report_bug+0x289/0x300 [ 80.097197][ T1081] do_error_trap+0x11b/0x200 [ 80.101769][ T1081] do_invalid_op+0x37/0x50 [ 80.106164][ T1081] ? collapse_file+0x1f9d/0x4170 [ 80.111078][ T1081] invalid_op+0x23/0x30 [ 80.115220][ T1081] RIP: 0010:collapse_file+0x1f9d/0x4170 [ 80.120749][ T1081] Code: a1 c0 ff 31 c9 ba 01 00 00 00 4c 89 fe 48 8b bd c0 fe ff ff e8 e4 e9 ec ff e9 b4 fd ff ff 4c 8b bd 88 fe ff ff e8 93 a1 c0 ff <0f> 0b 4c 8b a3 50 ff ff ff c7 85 80 fe ff ff 00 00 00 00 e9 05 f6 [ 80.140327][ T1081] RSP: 0018:ffff8880a7ef7ad0 EFLAGS: 00010293 [ 80.146379][ T1081] RAX: ffff8880a7eec480 RBX: ffff8880a7ef7c88 RCX: ffffffff81b2b688 [ 80.154382][ T1081] RDX: 0000000000000000 RSI: ffffffff81b2b9ad RDI: 0000000000000001 [ 80.162351][ T1081] RBP: ffff8880a7ef7cb0 R08: ffff8880a7eec480 R09: fffff9400005d879 [ 80.170308][ T1081] R10: fffff9400005d878 R11: ffffea00002ec3c7 R12: 0000000000000001 [ 80.178258][ T1081] R13: ffffea000243c188 R14: 0000000000000000 R15: ffffea0002230000 [ 80.186233][ T1081] ? collapse_file+0x1c78/0x4170 [ 80.191167][ T1081] ? collapse_file+0x1f9d/0x4170 [ 80.196304][ T1081] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 80.202540][ T1081] ? khugepaged+0x21d0/0x4360 [ 80.207206][ T1081] ? trace_event_raw_event_mm_collapse_huge_page_isolate+0x370/0x370 [ 80.215286][ T1081] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 80.221002][ T1081] ? khugepaged_find_target_node+0x142/0x180 [ 80.226985][ T1081] khugepaged+0x2da9/0x4360 [ 80.231489][ T1081] ? __kasan_check_read+0x11/0x20 [ 80.236623][ T1081] ? __lock_acquire+0x16f2/0x4a00 [ 80.241807][ T1081] ? _raw_spin_unlock_irq+0x23/0x80 [ 80.247005][ T1081] ? finish_task_switch+0x147/0x750 [ 80.252365][ T1081] ? _raw_spin_unlock_irq+0x23/0x80 [ 80.257574][ T1081] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.262853][ T1081] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 80.268483][ T1081] ? lock_downgrade+0x920/0x920 [ 80.273318][ T1081] ? finish_wait+0x260/0x260 [ 80.277885][ T1081] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.283155][ T1081] ? trace_hardirqs_on+0x67/0x240 [ 80.288255][ T1081] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 80.294498][ T1081] ? __kthread_parkme+0x108/0x1c0 [ 80.299795][ T1081] ? __kasan_check_read+0x11/0x20 [ 80.304871][ T1081] kthread+0x361/0x430 [ 80.308952][ T1081] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 80.314671][ T1081] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 80.320487][ T1081] ret_from_fork+0x24/0x30 [ 80.326737][ T1081] Kernel Offset: disabled [ 80.331602][ T1081] Rebooting in 86400 seconds..