[ 33.111873][ T25] audit: type=1800 audit(1571794750.657:21): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 33.150871][ T25] audit: type=1800 audit(1571794750.657:22): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 33.172860][ T25] audit: type=1800 audit(1571794750.657:23): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 33.194051][ T25] audit: type=1800 audit(1571794750.657:24): pid=7005 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. [ 33.539386][ T25] audit: type=1800 audit(1571794751.077:25): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.583934][ T25] audit: type=1800 audit(1571794751.077:26): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.605454][ T25] audit: type=1800 audit(1571794751.077:27): pid=7005 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 '10.128.0.107' (ECDSA) to the list of known hosts. 2019/10/23 01:39:17 fuzzer started 2019/10/23 01:39:19 dialing manager at 10.128.0.105:33369 2019/10/23 01:39:19 syscalls: 2524 2019/10/23 01:39:19 code coverage: enabled 2019/10/23 01:39:19 comparison tracing: enabled 2019/10/23 01:39:19 extra coverage: extra coverage is not supported by the kernel 2019/10/23 01:39:19 setuid sandbox: enabled 2019/10/23 01:39:19 namespace sandbox: enabled 2019/10/23 01:39:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 01:39:19 fault injection: enabled 2019/10/23 01:39:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 01:39:19 net packet injection: enabled 2019/10/23 01:39:19 net device setup: enabled 2019/10/23 01:39:19 concurrency sanitizer: enabled syzkaller login: [ 42.493169][ T7165] ================================================================== [ 42.501288][ T7165] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 42.507865][ T7165] [ 42.510186][ T7165] write to 0xffff88812289e5b8 of 4 bytes by interrupt on cpu 1: [ 42.517802][ T7165] tcp_queue_rcv+0x180/0x380 [ 42.522382][ T7165] tcp_rcv_established+0xbf1/0xf50 [ 42.527487][ T7165] tcp_v4_do_rcv+0x381/0x4e0 [ 42.532073][ T7165] tcp_v4_rcv+0x19dc/0x1bb0 [ 42.536574][ T7165] ip_protocol_deliver_rcu+0x4d/0x420 [ 42.541915][ T7165] ip_local_deliver_finish+0x110/0x140 [ 42.547344][ T7165] ip_local_deliver+0x133/0x210 [ 42.552173][ T7165] ip_rcv_finish+0x121/0x160 [ 42.557088][ T7165] ip_rcv+0x18f/0x1a0 [ 42.561045][ T7165] __netif_receive_skb_one_core+0xa7/0xe0 [ 42.566739][ T7165] __netif_receive_skb+0x37/0xf0 [ 42.571651][ T7165] netif_receive_skb_internal+0x59/0x190 [ 42.577257][ T7165] napi_gro_receive+0x28f/0x330 [ 42.582081][ T7165] receive_buf+0x284/0x30b0 [ 42.586550][ T7165] [ 42.588857][ T7165] read to 0xffff88812289e5b8 of 4 bytes by task 7165 on cpu 0: [ 42.596392][ T7165] tcp_poll+0x204/0x6b0 [ 42.600523][ T7165] sock_poll+0xed/0x250 [ 42.604663][ T7165] ep_item_poll.isra.0+0x90/0x190 [ 42.609663][ T7165] ep_send_events_proc+0x113/0x590 [ 42.614749][ T7165] ep_scan_ready_list.constprop.0+0x189/0x500 [ 42.620787][ T7165] ep_poll+0xe3/0x900 [ 42.624742][ T7165] do_epoll_wait+0x162/0x180 [ 42.629312][ T7165] __x64_sys_epoll_pwait+0xcd/0x180 [ 42.634491][ T7165] do_syscall_64+0xcc/0x370 [ 42.638969][ T7165] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.644826][ T7165] [ 42.647125][ T7165] Reported by Kernel Concurrency Sanitizer on: [ 42.653252][ T7165] CPU: 0 PID: 7165 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.660679][ T7165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.670715][ T7165] ================================================================== [ 42.678745][ T7165] Kernel panic - not syncing: panic_on_warn set ... [ 42.686085][ T7165] CPU: 0 PID: 7165 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.693509][ T7165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.703538][ T7165] Call Trace: [ 42.706804][ T7165] dump_stack+0xf5/0x159 [ 42.711022][ T7165] panic+0x210/0x640 [ 42.714905][ T7165] ? do_syscall_64+0xcc/0x370 [ 42.719569][ T7165] ? vprintk_func+0x8d/0x140 [ 42.724135][ T7165] kcsan_report.cold+0xc/0x10 [ 42.728787][ T7165] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 42.734306][ T7165] ? tcp_recvmsg+0x65b/0x1a30 [ 42.738957][ T7165] __tsan_read4+0x2c/0x30 [ 42.743274][ T7165] tcp_poll+0x204/0x6b0 [ 42.747417][ T7165] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 42.752863][ T7165] sock_poll+0xed/0x250 [ 42.757030][ T7165] ? sock_read_iter+0x1e0/0x1e0 [ 42.761862][ T7165] ep_item_poll.isra.0+0x90/0x190 [ 42.766866][ T7165] ep_send_events_proc+0x113/0x590 [ 42.771968][ T7165] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.777581][ T7165] ep_scan_ready_list.constprop.0+0x189/0x500 [ 42.783626][ T7165] ? ep_loop_check_proc+0x2f0/0x2f0 [ 42.788801][ T7165] ep_poll+0xe3/0x900 [ 42.792759][ T7165] ? __fget+0xb8/0x1d0 [ 42.796805][ T7165] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.802410][ T7165] ? __fget_light+0xaf/0x190 [ 42.806976][ T7165] do_epoll_wait+0x162/0x180 [ 42.811545][ T7165] __x64_sys_epoll_pwait+0xcd/0x180 [ 42.816727][ T7165] do_syscall_64+0xcc/0x370 [ 42.821207][ T7165] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.827070][ T7165] RIP: 0033:0x45b300 [ 42.830951][ T7165] 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 [ 42.850536][ T7165] RSP: 002b:000000c420149860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 42.858917][ T7165] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 42.866873][ T7165] RDX: 0000000000000080 RSI: 000000c4201498a0 RDI: 0000000000000004 [ 42.874829][ T7165] RBP: 000000c420149ea0 R08: 0000000000000000 R09: 0000000000000000 [ 42.882775][ T7165] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 42.890728][ T7165] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 42.899990][ T7165] Kernel Offset: disabled [ 42.904323][ T7165] Rebooting in 86400 seconds..