[ 34.185023][ T26] audit: type=1800 audit(1571760873.919:25): pid=7017 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.221314][ T26] audit: type=1800 audit(1571760873.919:26): pid=7017 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.250231][ T26] audit: type=1800 audit(1571760873.919:27): pid=7017 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. [ 34.747550][ T7083] sshd (7083) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.196' (ECDSA) to the list of known hosts. 2019/10/22 16:14:43 fuzzer started 2019/10/22 16:14:45 dialing manager at 10.128.0.105:33369 2019/10/22 16:14:45 syscalls: 2524 2019/10/22 16:14:45 code coverage: enabled 2019/10/22 16:14:45 comparison tracing: enabled 2019/10/22 16:14:45 extra coverage: extra coverage is not supported by the kernel 2019/10/22 16:14:45 setuid sandbox: enabled 2019/10/22 16:14:45 namespace sandbox: enabled 2019/10/22 16:14:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 16:14:45 fault injection: enabled 2019/10/22 16:14:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 16:14:45 net packet injection: enabled 2019/10/22 16:14:45 net device setup: enabled 2019/10/22 16:14:45 concurrency sanitizer: enabled syzkaller login: [ 46.124731][ T7171] ================================================================== [ 46.132907][ T7171] BUG: KCSAN: data-race in tcp_add_backlog / tcp_grow_window.isra.0 [ 46.140852][ T7171] [ 46.143158][ T7171] write to 0xffff888123398a2c of 4 bytes by interrupt on cpu 0: [ 46.150761][ T7171] tcp_add_backlog+0x4a0/0xcc0 [ 46.155501][ T7171] tcp_v4_rcv+0x1a60/0x1bb0 [ 46.159978][ T7171] ip_protocol_deliver_rcu+0x4d/0x420 [ 46.165324][ T7171] ip_local_deliver_finish+0x110/0x140 [ 46.170759][ T7171] ip_local_deliver+0x133/0x210 [ 46.175586][ T7171] ip_rcv_finish+0x121/0x160 [ 46.180147][ T7171] ip_rcv+0x18f/0x1a0 [ 46.184977][ T7171] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.190707][ T7171] __netif_receive_skb+0x37/0xf0 [ 46.195662][ T7171] netif_receive_skb_internal+0x59/0x190 [ 46.201268][ T7171] napi_gro_receive+0x28f/0x330 [ 46.206093][ T7171] receive_buf+0x284/0x30b0 [ 46.210569][ T7171] virtnet_poll+0x436/0x7d0 [ 46.215046][ T7171] net_rx_action+0x3ae/0xa90 [ 46.219604][ T7171] [ 46.221914][ T7171] read to 0xffff888123398a2c of 4 bytes by task 7171 on cpu 1: [ 46.229430][ T7171] tcp_grow_window.isra.0+0x6b/0x480 [ 46.234693][ T7171] tcp_event_data_recv+0x68f/0x990 [ 46.239781][ T7171] tcp_rcv_established+0xbfe/0xf50 [ 46.244881][ T7171] tcp_v4_do_rcv+0x381/0x4e0 [ 46.249448][ T7171] __release_sock+0x135/0x1e0 [ 46.254103][ T7171] release_sock+0x61/0x160 [ 46.258496][ T7171] tcp_recvmsg+0x63b/0x1a30 [ 46.262975][ T7171] inet_recvmsg+0xbb/0x250 [ 46.267369][ T7171] sock_recvmsg+0x92/0xb0 [ 46.271689][ T7171] sock_read_iter+0x15f/0x1e0 [ 46.276344][ T7171] new_sync_read+0x389/0x4f0 [ 46.280984][ T7171] __vfs_read+0xb1/0xc0 [ 46.285133][ T7171] vfs_read+0x143/0x2c0 [ 46.289257][ T7171] [ 46.291560][ T7171] Reported by Kernel Concurrency Sanitizer on: [ 46.297704][ T7171] CPU: 1 PID: 7171 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.305132][ T7171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.315159][ T7171] ================================================================== [ 46.323192][ T7171] Kernel panic - not syncing: panic_on_warn set ... [ 46.329753][ T7171] CPU: 1 PID: 7171 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.337179][ T7171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.347223][ T7171] Call Trace: [ 46.350591][ T7171] dump_stack+0xf5/0x159 [ 46.354816][ T7171] panic+0x210/0x640 [ 46.358690][ T7171] ? sock_recvmsg+0x92/0xb0 [ 46.363170][ T7171] ? vprintk_func+0x8d/0x140 [ 46.367777][ T7171] kcsan_report.cold+0xc/0x10 [ 46.372451][ T7171] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.377978][ T7171] __tsan_read4+0x2c/0x30 [ 46.382286][ T7171] tcp_grow_window.isra.0+0x6b/0x480 [ 46.387585][ T7171] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 46.393199][ T7171] tcp_event_data_recv+0x68f/0x990 [ 46.398333][ T7171] tcp_rcv_established+0xbfe/0xf50 [ 46.403461][ T7171] ? ipv4_dst_check+0xc6/0xf0 [ 46.408120][ T7171] tcp_v4_do_rcv+0x381/0x4e0 [ 46.412688][ T7171] __release_sock+0x135/0x1e0 [ 46.417343][ T7171] release_sock+0x61/0x160 [ 46.421754][ T7171] tcp_recvmsg+0x63b/0x1a30 [ 46.426363][ T7171] inet_recvmsg+0xbb/0x250 [ 46.430754][ T7171] ? __tsan_read8+0x2c/0x30 [ 46.435236][ T7171] ? inet_sendpage+0x100/0x100 [ 46.442074][ T7171] sock_recvmsg+0x92/0xb0 [ 46.446383][ T7171] sock_read_iter+0x15f/0x1e0 [ 46.451042][ T7171] new_sync_read+0x389/0x4f0 [ 46.455615][ T7171] __vfs_read+0xb1/0xc0 [ 46.459749][ T7171] vfs_read+0x143/0x2c0 [ 46.463884][ T7171] ksys_read+0xd5/0x1b0 [ 46.468023][ T7171] __x64_sys_read+0x4c/0x60 [ 46.472506][ T7171] do_syscall_64+0xcc/0x370 [ 46.476990][ T7171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.482859][ T7171] RIP: 0033:0x47c530 [ 46.486734][ T7171] 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 [ 46.506320][ T7171] RSP: 002b:000000c4204f57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.514747][ T7171] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.522693][ T7171] RDX: 0000000000001000 RSI: 000000c4203d4000 RDI: 0000000000000003 [ 46.530732][ T7171] RBP: 000000c4204f5830 R08: 0000000000000000 R09: 0000000000000000 [ 46.538687][ T7171] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 46.546638][ T7171] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.556005][ T7171] Kernel Offset: disabled [ 46.560323][ T7171] Rebooting in 86400 seconds..