[ 35.773662][ T26] audit: type=1800 audit(1570191293.212:25): pid=7039 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.813360][ T26] audit: type=1800 audit(1570191293.212:26): pid=7039 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.835135][ T26] audit: type=1800 audit(1570191293.212:27): pid=7039 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. [ 36.151267][ T7103] sshd (7103) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.129' (ECDSA) to the list of known hosts. 2019/10/04 12:15:00 fuzzer started 2019/10/04 12:15:02 dialing manager at 10.128.0.105:38119 2019/10/04 12:15:02 syscalls: 2523 2019/10/04 12:15:02 code coverage: enabled 2019/10/04 12:15:02 comparison tracing: enabled 2019/10/04 12:15:02 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:15:02 setuid sandbox: enabled 2019/10/04 12:15:02 namespace sandbox: enabled 2019/10/04 12:15:02 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:15:02 fault injection: enabled 2019/10/04 12:15:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:15:02 net packet injection: enabled 2019/10/04 12:15:02 net device setup: enabled 2019/10/04 12:15:02 concurrency sanitizer: enabled syzkaller login: [ 45.343711][ T7192] ================================================================== [ 45.352045][ T7192] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480 [ 45.362407][ T7192] [ 45.364731][ T7192] write to 0xffff888122f9a16c of 4 bytes by interrupt on cpu 1: [ 45.372361][ T7192] tcp_add_backlog+0x4a0/0xcc0 [ 45.377108][ T7192] tcp_v4_rcv+0x1aba/0x1bf0 [ 45.381600][ T7192] ip_protocol_deliver_rcu+0x51/0x470 [ 45.386962][ T7192] ip_local_deliver_finish+0x110/0x140 [ 45.392501][ T7192] ip_local_deliver+0x133/0x210 [ 45.397334][ T7192] ip_rcv_finish+0x121/0x160 [ 45.401917][ T7192] ip_rcv+0x18f/0x1a0 [ 45.406668][ T7192] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.412386][ T7192] __netif_receive_skb+0x37/0xf0 [ 45.417301][ T7192] netif_receive_skb_internal+0x59/0x190 [ 45.423084][ T7192] napi_gro_receive+0x28f/0x330 [ 45.428089][ T7192] receive_buf+0x284/0x30b0 [ 45.432582][ T7192] virtnet_poll+0x436/0x7d0 [ 45.437152][ T7192] net_rx_action+0x3ae/0xa50 [ 45.441802][ T7192] [ 45.444296][ T7192] read to 0xffff888122f9a16c of 4 bytes by task 7192 on cpu 0: [ 45.451919][ T7192] tcp_grow_window.isra.0+0x6b/0x480 [ 45.457193][ T7192] tcp_event_data_recv+0x68f/0x990 [ 45.462302][ T7192] tcp_rcv_established+0xbfe/0xf50 [ 45.467519][ T7192] tcp_v4_do_rcv+0x381/0x4e0 [ 45.472267][ T7192] __release_sock+0x135/0x1e0 [ 45.476930][ T7192] release_sock+0x61/0x160 [ 45.481331][ T7192] tcp_recvmsg+0x63b/0x1a30 [ 45.485903][ T7192] inet_recvmsg+0xbb/0x250 [ 45.490300][ T7192] sock_recvmsg+0x92/0xb0 [ 45.494625][ T7192] sock_read_iter+0x15f/0x1e0 [ 45.499284][ T7192] new_sync_read+0x389/0x4f0 [ 45.503866][ T7192] __vfs_read+0xb1/0xc0 [ 45.508002][ T7192] vfs_read+0x143/0x2c0 [ 45.512135][ T7192] [ 45.514440][ T7192] Reported by Kernel Concurrency Sanitizer on: [ 45.520591][ T7192] CPU: 0 PID: 7192 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.527688][ T7192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.537805][ T7192] ================================================================== [ 45.545844][ T7192] Kernel panic - not syncing: panic_on_warn set ... [ 45.552508][ T7192] CPU: 0 PID: 7192 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.559616][ T7192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.569920][ T7192] Call Trace: [ 45.573210][ T7192] dump_stack+0xf5/0x159 [ 45.577449][ T7192] panic+0x209/0x639 [ 45.581343][ T7192] ? vprintk_func+0x8d/0x140 [ 45.585914][ T7192] kcsan_report.cold+0x57/0xeb [ 45.590673][ T7192] __kcsan_setup_watchpoint+0x342/0x500 [ 45.596218][ T7192] __tsan_read4+0x2c/0x30 [ 45.600533][ T7192] tcp_grow_window.isra.0+0x6b/0x480 [ 45.605803][ T7192] tcp_event_data_recv+0x68f/0x990 [ 45.610916][ T7192] tcp_rcv_established+0xbfe/0xf50 [ 45.616009][ T7192] ? ipv4_dst_check+0xc6/0xf0 [ 45.620663][ T7192] tcp_v4_do_rcv+0x381/0x4e0 [ 45.625264][ T7192] __release_sock+0x135/0x1e0 [ 45.629922][ T7192] release_sock+0x61/0x160 [ 45.634326][ T7192] tcp_recvmsg+0x63b/0x1a30 [ 45.638827][ T7192] inet_recvmsg+0xbb/0x250 [ 45.643220][ T7192] ? __tsan_read8+0x2c/0x30 [ 45.647705][ T7192] ? inet_sendpage+0x100/0x100 [ 45.652445][ T7192] sock_recvmsg+0x92/0xb0 [ 45.656774][ T7192] sock_read_iter+0x15f/0x1e0 [ 45.661440][ T7192] new_sync_read+0x389/0x4f0 [ 45.666194][ T7192] __vfs_read+0xb1/0xc0 [ 45.670344][ T7192] vfs_read+0x143/0x2c0 [ 45.674493][ T7192] ksys_read+0xd5/0x1b0 [ 45.678630][ T7192] __x64_sys_read+0x4c/0x60 [ 45.683129][ T7192] do_syscall_64+0xcf/0x2f0 [ 45.687650][ T7192] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.693521][ T7192] RIP: 0033:0x47c530 [ 45.697525][ T7192] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 45.717121][ T7192] RSP: 002b:000000c420149818 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 45.725513][ T7192] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.733471][ T7192] RDX: 0000000000001000 RSI: 000000c42016a000 RDI: 0000000000000003 [ 45.741417][ T7192] RBP: 000000c420149870 R08: 0000000000000000 R09: 0000000000000000 [ 45.749472][ T7192] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 45.757426][ T7192] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 45.767058][ T7192] Kernel Offset: disabled [ 45.771384][ T7192] Rebooting in 86400 seconds..