[ 35.686547][ T26] audit: type=1800 audit(1571794741.608:25): pid=7110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.706256][ T26] audit: type=1800 audit(1571794741.608:26): pid=7110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.726419][ T26] audit: type=1800 audit(1571794741.608:27): pid=7110 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. [ 36.442956][ T7175] sshd (7175) 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 '10.128.0.239' (ECDSA) to the list of known hosts. 2019/10/23 01:39:13 fuzzer started 2019/10/23 01:39:14 dialing manager at 10.128.0.105:33369 2019/10/23 01:39:14 syscalls: 2524 2019/10/23 01:39:14 code coverage: enabled 2019/10/23 01:39:14 comparison tracing: enabled 2019/10/23 01:39:14 extra coverage: extra coverage is not supported by the kernel 2019/10/23 01:39:14 setuid sandbox: enabled 2019/10/23 01:39:14 namespace sandbox: enabled 2019/10/23 01:39:14 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 01:39:14 fault injection: enabled 2019/10/23 01:39:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 01:39:14 net packet injection: enabled 2019/10/23 01:39:14 net device setup: enabled 2019/10/23 01:39:14 concurrency sanitizer: enabled syzkaller login: [ 49.414589][ T7262] ================================================================== [ 49.422778][ T7262] BUG: KCSAN: data-race in __tcp_select_window / tcp_add_backlog [ 49.430479][ T7262] [ 49.432791][ T7262] write to 0xffff888126b6212c of 4 bytes by interrupt on cpu 0: [ 49.440397][ T7262] tcp_add_backlog+0x4a0/0xcc0 [ 49.445136][ T7262] tcp_v4_rcv+0x1a60/0x1bb0 [ 49.449617][ T7262] ip_protocol_deliver_rcu+0x4d/0x420 [ 49.454963][ T7262] ip_local_deliver_finish+0x110/0x140 [ 49.460408][ T7262] ip_local_deliver+0x133/0x210 [ 49.465231][ T7262] ip_rcv_finish+0x121/0x160 [ 49.469808][ T7262] ip_rcv+0x18f/0x1a0 [ 49.473770][ T7262] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.479490][ T7262] __netif_receive_skb+0x37/0xf0 [ 49.484406][ T7262] netif_receive_skb_internal+0x59/0x190 [ 49.490024][ T7262] napi_gro_receive+0x28f/0x330 [ 49.494850][ T7262] receive_buf+0x284/0x30b0 [ 49.499335][ T7262] virtnet_poll+0x436/0x7d0 [ 49.503832][ T7262] net_rx_action+0x3ae/0xa90 [ 49.508389][ T7262] [ 49.510697][ T7262] read to 0xffff888126b6212c of 4 bytes by task 7262 on cpu 1: [ 49.518216][ T7262] __tcp_select_window+0x6b/0x4d0 [ 49.523226][ T7262] __tcp_transmit_skb+0x700/0x1d60 [ 49.528317][ T7262] __tcp_send_ack+0x246/0x300 [ 49.532969][ T7262] tcp_send_ack+0x34/0x40 [ 49.537277][ T7262] tcp_cleanup_rbuf+0x130/0x360 [ 49.542118][ T7262] tcp_recvmsg+0x633/0x1a30 [ 49.546699][ T7262] inet_recvmsg+0xbb/0x250 [ 49.551093][ T7262] sock_recvmsg+0x92/0xb0 [ 49.555411][ T7262] sock_read_iter+0x15f/0x1e0 [ 49.560083][ T7262] new_sync_read+0x389/0x4f0 [ 49.564751][ T7262] __vfs_read+0xb1/0xc0 [ 49.568883][ T7262] vfs_read+0x143/0x2c0 [ 49.573032][ T7262] ksys_read+0xd5/0x1b0 [ 49.577170][ T7262] [ 49.579503][ T7262] Reported by Kernel Concurrency Sanitizer on: [ 49.585719][ T7262] CPU: 1 PID: 7262 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.593345][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.603400][ T7262] ================================================================== [ 49.611434][ T7262] Kernel panic - not syncing: panic_on_warn set ... [ 49.618012][ T7262] CPU: 1 PID: 7262 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.625440][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.635468][ T7262] Call Trace: [ 49.638750][ T7262] dump_stack+0xf5/0x159 [ 49.642985][ T7262] panic+0x210/0x640 [ 49.647053][ T7262] ? sock_read_iter+0x15f/0x1e0 [ 49.652154][ T7262] ? vprintk_func+0x8d/0x140 [ 49.656731][ T7262] kcsan_report.cold+0xc/0x10 [ 49.661389][ T7262] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.666912][ T7262] __tsan_read4+0x2c/0x30 [ 49.671221][ T7262] __tcp_select_window+0x6b/0x4d0 [ 49.676224][ T7262] __tcp_transmit_skb+0x700/0x1d60 [ 49.681330][ T7262] __tcp_send_ack+0x246/0x300 [ 49.685998][ T7262] tcp_send_ack+0x34/0x40 [ 49.690312][ T7262] tcp_cleanup_rbuf+0x130/0x360 [ 49.695143][ T7262] tcp_recvmsg+0x633/0x1a30 [ 49.699648][ T7262] inet_recvmsg+0xbb/0x250 [ 49.704050][ T7262] ? __tsan_read8+0x2c/0x30 [ 49.708543][ T7262] ? inet_sendpage+0x100/0x100 [ 49.713291][ T7262] sock_recvmsg+0x92/0xb0 [ 49.717610][ T7262] sock_read_iter+0x15f/0x1e0 [ 49.722268][ T7262] new_sync_read+0x389/0x4f0 [ 49.726848][ T7262] __vfs_read+0xb1/0xc0 [ 49.730981][ T7262] vfs_read+0x143/0x2c0 [ 49.735123][ T7262] ksys_read+0xd5/0x1b0 [ 49.739260][ T7262] __x64_sys_read+0x4c/0x60 [ 49.743744][ T7262] do_syscall_64+0xcc/0x370 [ 49.748226][ T7262] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.754092][ T7262] RIP: 0033:0x47c530 [ 49.757966][ T7262] 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 [ 49.777551][ T7262] RSP: 002b:000000c4204eb810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 49.785948][ T7262] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.794076][ T7262] RDX: 0000000000001000 RSI: 000000c420156000 RDI: 0000000000000003 [ 49.802027][ T7262] RBP: 000000c4204eb868 R08: 0000000000000000 R09: 0000000000000000 [ 49.809977][ T7262] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000080 [ 49.817939][ T7262] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.827073][ T7262] Kernel Offset: disabled [ 49.831396][ T7262] Rebooting in 86400 seconds..