[?25l[?1c7[ ok 8[?25h[?0c. [ 34.417465][ T25] audit: type=1800 audit(1570192406.344:25): pid=7012 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.437073][ T25] audit: type=1800 audit(1570192406.344:26): pid=7012 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.437094][ T25] audit: type=1800 audit(1570192406.344:27): pid=7012 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 '10.128.0.141' (ECDSA) to the list of known hosts. 2019/10/04 12:33:36 fuzzer started 2019/10/04 12:33:38 dialing manager at 10.128.0.105:38119 2019/10/04 12:33:38 syscalls: 2523 2019/10/04 12:33:38 code coverage: enabled 2019/10/04 12:33:38 comparison tracing: enabled 2019/10/04 12:33:38 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:33:38 setuid sandbox: enabled 2019/10/04 12:33:38 namespace sandbox: enabled 2019/10/04 12:33:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:33:38 fault injection: enabled 2019/10/04 12:33:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:33:38 net packet injection: enabled 2019/10/04 12:33:38 net device setup: enabled 2019/10/04 12:33:38 concurrency sanitizer: enabled syzkaller login: [ 47.415582][ T7174] ================================================================== [ 47.424192][ T7174] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480 [ 47.434692][ T7174] [ 47.437112][ T7174] write to 0xffff888122e292ec of 4 bytes by interrupt on cpu 1: [ 47.444858][ T7174] tcp_add_backlog+0x4a0/0xcc0 [ 47.449881][ T7174] tcp_v4_rcv+0x1aba/0x1bf0 [ 47.454384][ T7174] ip_protocol_deliver_rcu+0x51/0x470 [ 47.460169][ T7174] ip_local_deliver_finish+0x110/0x140 [ 47.465751][ T7174] ip_local_deliver+0x133/0x210 [ 47.470885][ T7174] ip_rcv_finish+0x121/0x160 [ 47.475710][ T7174] ip_rcv+0x18f/0x1a0 [ 47.479706][ T7174] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.485794][ T7174] __netif_receive_skb+0x37/0xf0 [ 47.491126][ T7174] netif_receive_skb_internal+0x59/0x190 [ 47.496920][ T7174] napi_gro_receive+0x28f/0x330 [ 47.501946][ T7174] receive_buf+0x284/0x30b0 [ 47.506712][ T7174] virtnet_poll+0x436/0x7d0 [ 47.511346][ T7174] net_rx_action+0x3ae/0xa50 [ 47.516460][ T7174] [ 47.519247][ T7174] read to 0xffff888122e292ec of 4 bytes by task 7174 on cpu 0: [ 47.527648][ T7174] tcp_grow_window.isra.0+0x6b/0x480 [ 47.532925][ T7174] tcp_event_data_recv+0x68f/0x990 [ 47.538171][ T7174] tcp_rcv_established+0xbfe/0xf50 [ 47.543796][ T7174] tcp_v4_do_rcv+0x381/0x4e0 [ 47.548404][ T7174] __release_sock+0x135/0x1e0 [ 47.553069][ T7174] release_sock+0x61/0x160 [ 47.557726][ T7174] tcp_recvmsg+0x63b/0x1a30 [ 47.562336][ T7174] inet_recvmsg+0xbb/0x250 [ 47.566870][ T7174] sock_recvmsg+0x92/0xb0 [ 47.571633][ T7174] sock_read_iter+0x15f/0x1e0 [ 47.576504][ T7174] new_sync_read+0x389/0x4f0 [ 47.581313][ T7174] __vfs_read+0xb1/0xc0 [ 47.585803][ T7174] vfs_read+0x143/0x2c0 [ 47.590024][ T7174] [ 47.592347][ T7174] Reported by Kernel Concurrency Sanitizer on: [ 47.598582][ T7174] CPU: 0 PID: 7174 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.606102][ T7174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.616401][ T7174] ================================================================== [ 47.624539][ T7174] Kernel panic - not syncing: panic_on_warn set ... [ 47.631120][ T7174] CPU: 0 PID: 7174 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.638211][ T7174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.648382][ T7174] Call Trace: [ 47.651767][ T7174] dump_stack+0xf5/0x159 [ 47.656008][ T7174] panic+0x209/0x639 [ 47.659898][ T7174] ? vprintk_func+0x8d/0x140 [ 47.664653][ T7174] kcsan_report.cold+0x57/0xeb [ 47.669532][ T7174] __kcsan_setup_watchpoint+0x342/0x500 [ 47.675070][ T7174] __tsan_read4+0x2c/0x30 [ 47.679396][ T7174] tcp_grow_window.isra.0+0x6b/0x480 [ 47.684950][ T7174] tcp_event_data_recv+0x68f/0x990 [ 47.690225][ T7174] tcp_rcv_established+0xbfe/0xf50 [ 47.695672][ T7174] ? ipv4_dst_check+0xc6/0xf0 [ 47.700485][ T7174] tcp_v4_do_rcv+0x381/0x4e0 [ 47.705094][ T7174] __release_sock+0x135/0x1e0 [ 47.709789][ T7174] release_sock+0x61/0x160 [ 47.714200][ T7174] tcp_recvmsg+0x63b/0x1a30 [ 47.719209][ T7174] inet_recvmsg+0xbb/0x250 [ 47.724083][ T7174] ? __tsan_read8+0x2c/0x30 [ 47.728905][ T7174] ? inet_sendpage+0x100/0x100 [ 47.733965][ T7174] sock_recvmsg+0x92/0xb0 [ 47.739064][ T7174] sock_read_iter+0x15f/0x1e0 [ 47.744015][ T7174] new_sync_read+0x389/0x4f0 [ 47.748610][ T7174] __vfs_read+0xb1/0xc0 [ 47.752948][ T7174] vfs_read+0x143/0x2c0 [ 47.757504][ T7174] ksys_read+0xd5/0x1b0 [ 47.763410][ T7174] __x64_sys_read+0x4c/0x60 [ 47.769065][ T7174] do_syscall_64+0xcf/0x2f0 [ 47.773979][ T7174] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.780839][ T7174] RIP: 0033:0x47c530 [ 47.784907][ T7174] 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 [ 47.805647][ T7174] RSP: 002b:000000c42014b850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 47.816155][ T7174] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.825174][ T7174] RDX: 0000000000001000 RSI: 000000c420058000 RDI: 0000000000000003 [ 47.833834][ T7174] RBP: 000000c42014b8a8 R08: 0000000000000000 R09: 0000000000000000 [ 47.842485][ T7174] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000010 [ 47.850939][ T7174] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 47.861520][ T7174] Kernel Offset: disabled [ 47.866259][ T7174] Rebooting in 86400 seconds..