[ 34.953124][ T25] audit: type=1800 audit(1571783118.201:23): pid=7071 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 34.973821][ T25] audit: type=1800 audit(1571783118.201:24): pid=7071 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.420168][ T25] audit: type=1800 audit(1571783118.711:25): pid=7071 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.456499][ T25] audit: type=1800 audit(1571783118.711:26): pid=7071 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.476563][ T25] audit: type=1800 audit(1571783118.721:27): pid=7071 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 '10.128.0.189' (ECDSA) to the list of known hosts. 2019/10/22 22:25:25 fuzzer started 2019/10/22 22:25:27 dialing manager at 10.128.0.105:33369 2019/10/22 22:25:28 syscalls: 2524 2019/10/22 22:25:28 code coverage: enabled 2019/10/22 22:25:28 comparison tracing: enabled 2019/10/22 22:25:28 extra coverage: extra coverage is not supported by the kernel 2019/10/22 22:25:28 setuid sandbox: enabled 2019/10/22 22:25:28 namespace sandbox: enabled 2019/10/22 22:25:28 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 22:25:28 fault injection: enabled 2019/10/22 22:25:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 22:25:28 net packet injection: enabled 2019/10/22 22:25:28 net device setup: enabled 2019/10/22 22:25:28 concurrency sanitizer: enabled syzkaller login: [ 45.344366][ T7240] ================================================================== [ 45.352486][ T7240] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 45.359238][ T7240] [ 45.361553][ T7240] write to 0xffff8881236557b8 of 4 bytes by interrupt on cpu 0: [ 45.369158][ T7240] tcp_queue_rcv+0x180/0x380 [ 45.373721][ T7240] tcp_rcv_established+0xbf1/0xf50 [ 45.378806][ T7240] tcp_v4_do_rcv+0x381/0x4e0 [ 45.383370][ T7240] tcp_v4_rcv+0x19dc/0x1bb0 [ 45.387856][ T7240] ip_protocol_deliver_rcu+0x4d/0x420 [ 45.393251][ T7240] ip_local_deliver_finish+0x110/0x140 [ 45.398716][ T7240] ip_local_deliver+0x133/0x210 [ 45.403540][ T7240] ip_rcv_finish+0x121/0x160 [ 45.408136][ T7240] ip_rcv+0x18f/0x1a0 [ 45.412095][ T7240] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.417785][ T7240] __netif_receive_skb+0x37/0xf0 [ 45.422697][ T7240] netif_receive_skb_internal+0x59/0x190 [ 45.428300][ T7240] napi_gro_receive+0x28f/0x330 [ 45.433163][ T7240] receive_buf+0x284/0x30b0 [ 45.437633][ T7240] [ 45.439942][ T7240] read to 0xffff8881236557b8 of 4 bytes by task 7240 on cpu 1: [ 45.447470][ T7240] tcp_poll+0x204/0x6b0 [ 45.451600][ T7240] sock_poll+0xed/0x250 [ 45.455729][ T7240] ep_item_poll.isra.0+0x90/0x190 [ 45.460747][ T7240] ep_send_events_proc+0x113/0x590 [ 45.465837][ T7240] ep_scan_ready_list.constprop.0+0x189/0x500 [ 45.471877][ T7240] ep_poll+0xe3/0x900 [ 45.475832][ T7240] do_epoll_wait+0x162/0x180 [ 45.480394][ T7240] __x64_sys_epoll_pwait+0xcd/0x180 [ 45.485568][ T7240] do_syscall_64+0xcc/0x370 [ 45.490045][ T7240] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.495906][ T7240] [ 45.498208][ T7240] Reported by Kernel Concurrency Sanitizer on: [ 45.504352][ T7240] CPU: 1 PID: 7240 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.511776][ T7240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.521803][ T7240] ================================================================== [ 45.529835][ T7240] Kernel panic - not syncing: panic_on_warn set ... [ 45.536395][ T7240] CPU: 1 PID: 7240 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.543823][ T7240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.553861][ T7240] Call Trace: [ 45.557128][ T7240] dump_stack+0xf5/0x159 [ 45.561345][ T7240] panic+0x210/0x640 [ 45.565221][ T7240] ? do_syscall_64+0xcc/0x370 [ 45.569875][ T7240] ? vprintk_func+0x8d/0x140 [ 45.574444][ T7240] kcsan_report.cold+0xc/0x10 [ 45.579096][ T7240] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.584618][ T7240] ? tcp_recvmsg+0x65b/0x1a30 [ 45.589272][ T7240] __tsan_read4+0x2c/0x30 [ 45.593576][ T7240] tcp_poll+0x204/0x6b0 [ 45.597723][ T7240] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 45.603156][ T7240] sock_poll+0xed/0x250 [ 45.607291][ T7240] ? sock_read_iter+0x1e0/0x1e0 [ 45.612146][ T7240] ep_item_poll.isra.0+0x90/0x190 [ 45.617158][ T7240] ep_send_events_proc+0x113/0x590 [ 45.622257][ T7240] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.627869][ T7240] ep_scan_ready_list.constprop.0+0x189/0x500 [ 45.633926][ T7240] ? ep_loop_check_proc+0x2f0/0x2f0 [ 45.639104][ T7240] ep_poll+0xe3/0x900 [ 45.643061][ T7240] ? __fget+0xb8/0x1d0 [ 45.647110][ T7240] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.652724][ T7240] ? __fget_light+0xaf/0x190 [ 45.657306][ T7240] do_epoll_wait+0x162/0x180 [ 45.661890][ T7240] __x64_sys_epoll_pwait+0xcd/0x180 [ 45.667087][ T7240] do_syscall_64+0xcc/0x370 [ 45.671579][ T7240] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.677452][ T7240] RIP: 0033:0x45b300 [ 45.681340][ T7240] 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 [ 45.700928][ T7240] RSP: 002b:000000c4202cd860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 45.709324][ T7240] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 45.717282][ T7240] RDX: 0000000000000080 RSI: 000000c4202cd8a0 RDI: 0000000000000004 [ 45.725242][ T7240] RBP: 000000c4202cdea0 R08: 0000000000000000 R09: 0000000000000000 [ 45.733198][ T7240] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 45.741156][ T7240] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 45.750415][ T7240] Kernel Offset: disabled [ 45.754731][ T7240] Rebooting in 86400 seconds..