[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.661050][ T26] audit: type=1800 audit(1570192634.197:25): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.698430][ T26] audit: type=1800 audit(1570192634.197:26): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.727659][ T26] audit: type=1800 audit(1570192634.197:27): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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 '10.128.0.212' (ECDSA) to the list of known hosts. 2019/10/04 12:37:26 fuzzer started 2019/10/04 12:37:27 dialing manager at 10.128.0.105:38119 2019/10/04 12:37:27 syscalls: 2523 2019/10/04 12:37:27 code coverage: enabled 2019/10/04 12:37:27 comparison tracing: enabled 2019/10/04 12:37:27 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:37:27 setuid sandbox: enabled 2019/10/04 12:37:27 namespace sandbox: enabled 2019/10/04 12:37:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:37:27 fault injection: enabled 2019/10/04 12:37:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:37:27 net packet injection: enabled 2019/10/04 12:37:27 net device setup: enabled 2019/10/04 12:37:27 concurrency sanitizer: enabled syzkaller login: [ 50.035186][ T7206] ================================================================== [ 50.043446][ T7206] BUG: KCSAN: data-race in ep_poll+0x5a2/0x900 and ep_poll_callback+0x5e7/0x6a0 [ 50.052451][ T7206] [ 50.054785][ T7206] write to 0xffff888124f62650 of 8 bytes by interrupt on cpu 1: [ 50.062414][ T7206] ep_poll_callback+0x5e7/0x6a0 [ 50.067365][ T7206] __wake_up_common+0x7b/0x180 [ 50.072104][ T7206] __wake_up_common_lock+0x77/0xb0 [ 50.077192][ T7206] __wake_up_sync_key+0x19/0x20 [ 50.082022][ T7206] sock_def_readable+0xa9/0x140 [ 50.086853][ T7206] tcp_data_ready+0x7d/0xd0 [ 50.091331][ T7206] tcp_rcv_established+0xd0c/0xf50 [ 50.096418][ T7206] tcp_v4_do_rcv+0x381/0x4e0 [ 50.101000][ T7206] tcp_v4_rcv+0x1a03/0x1bf0 [ 50.105497][ T7206] ip_protocol_deliver_rcu+0x51/0x470 [ 50.110865][ T7206] ip_local_deliver_finish+0x110/0x140 [ 50.116298][ T7206] ip_local_deliver+0x133/0x210 [ 50.121121][ T7206] ip_rcv_finish+0x121/0x160 [ 50.125690][ T7206] ip_rcv+0x18f/0x1a0 [ 50.129657][ T7206] [ 50.131980][ T7206] read to 0xffff888124f62650 of 8 bytes by task 7206 on cpu 0: [ 50.139520][ T7206] ep_poll+0x5a2/0x900 [ 50.143582][ T7206] do_epoll_wait+0x162/0x180 [ 50.148152][ T7206] __x64_sys_epoll_pwait+0xcd/0x170 [ 50.153326][ T7206] do_syscall_64+0xcf/0x2f0 [ 50.157812][ T7206] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.163675][ T7206] [ 50.165980][ T7206] Reported by Kernel Concurrency Sanitizer on: [ 50.172108][ T7206] CPU: 0 PID: 7206 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.179201][ T7206] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.189252][ T7206] ================================================================== [ 50.197287][ T7206] Kernel panic - not syncing: panic_on_warn set ... [ 50.204286][ T7206] CPU: 0 PID: 7206 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.211366][ T7206] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.221398][ T7206] Call Trace: [ 50.224758][ T7206] dump_stack+0xf5/0x159 [ 50.228985][ T7206] panic+0x209/0x639 [ 50.232868][ T7206] ? vprintk_func+0x8d/0x140 [ 50.237456][ T7206] kcsan_report.cold+0x57/0xeb [ 50.242201][ T7206] __kcsan_setup_watchpoint+0x342/0x500 [ 50.247736][ T7206] __tsan_read8+0x2c/0x30 [ 50.252047][ T7206] ep_poll+0x5a2/0x900 [ 50.256114][ T7206] ? wake_up_q+0x70/0x70 [ 50.260354][ T7206] do_epoll_wait+0x162/0x180 [ 50.264925][ T7206] __x64_sys_epoll_pwait+0xcd/0x170 [ 50.270103][ T7206] do_syscall_64+0xcf/0x2f0 [ 50.274597][ T7206] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.280477][ T7206] RIP: 0033:0x45b300 [ 50.284354][ T7206] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 50.303947][ T7206] RSP: 002b:000000c420051860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 50.312335][ T7206] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 50.320282][ T7206] RDX: 0000000000000080 RSI: 000000c4200518a0 RDI: 0000000000000004 [ 50.328229][ T7206] RBP: 000000c420051ea0 R08: 0000000000000000 R09: 0000000000000000 [ 50.336177][ T7206] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000008 [ 50.344125][ T7206] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 50.353603][ T7206] Kernel Offset: disabled [ 50.357924][ T7206] Rebooting in 86400 seconds..