[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.720754][ T25] audit: type=1800 audit(1571386483.728:25): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.748391][ T25] audit: type=1800 audit(1571386483.738:26): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.779758][ T25] audit: type=1800 audit(1571386483.738:27): pid=7089 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 '10.128.15.195' (ECDSA) to the list of known hosts. 2019/10/18 08:14:50 fuzzer started 2019/10/18 08:14:51 dialing manager at 10.128.0.105:43535 2019/10/18 08:14:51 syscalls: 2524 2019/10/18 08:14:51 code coverage: enabled 2019/10/18 08:14:51 comparison tracing: enabled 2019/10/18 08:14:51 extra coverage: extra coverage is not supported by the kernel 2019/10/18 08:14:51 setuid sandbox: enabled 2019/10/18 08:14:51 namespace sandbox: enabled 2019/10/18 08:14:51 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/18 08:14:51 fault injection: enabled 2019/10/18 08:14:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/18 08:14:51 net packet injection: enabled 2019/10/18 08:14:51 net device setup: enabled 2019/10/18 08:14:51 concurrency sanitizer: enabled syzkaller login: [ 44.122431][ T7245] ================================================================== [ 44.130578][ T7245] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 44.138379][ T7245] [ 44.140694][ T7245] read to 0xffff888126fd334c of 4 bytes by interrupt on cpu 0: [ 44.148274][ T7245] tcp_add_backlog+0x43/0xcc0 [ 44.152961][ T7245] tcp_v4_rcv+0x1a60/0x1bb0 [ 44.157559][ T7245] ip_protocol_deliver_rcu+0x4d/0x420 [ 44.162928][ T7245] ip_local_deliver_finish+0x110/0x140 [ 44.171231][ T7245] ip_local_deliver+0x133/0x210 [ 44.176057][ T7245] ip_rcv_finish+0x121/0x160 [ 44.180619][ T7245] ip_rcv+0x18f/0x1a0 [ 44.184597][ T7245] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.190632][ T7245] __netif_receive_skb+0x37/0xf0 [ 44.195573][ T7245] netif_receive_skb_internal+0x59/0x190 [ 44.201191][ T7245] napi_gro_receive+0x28f/0x330 [ 44.206059][ T7245] receive_buf+0x284/0x30b0 [ 44.210643][ T7245] virtnet_poll+0x436/0x7d0 [ 44.215236][ T7245] net_rx_action+0x3ae/0xa90 [ 44.219810][ T7245] [ 44.222125][ T7245] write to 0xffff888126fd334c of 4 bytes by task 7245 on cpu 1: [ 44.229967][ T7245] tcp_rcv_space_adjust+0x40f/0x4c0 [ 44.235150][ T7245] tcp_recvmsg+0xdaa/0x1a30 [ 44.239642][ T7245] inet_recvmsg+0xbb/0x250 [ 44.244046][ T7245] sock_recvmsg+0x92/0xb0 [ 44.248363][ T7245] sock_read_iter+0x15f/0x1e0 [ 44.253066][ T7245] new_sync_read+0x389/0x4f0 [ 44.257635][ T7245] __vfs_read+0xb1/0xc0 [ 44.261771][ T7245] vfs_read+0x143/0x2c0 [ 44.266038][ T7245] ksys_read+0xd5/0x1b0 [ 44.270198][ T7245] __x64_sys_read+0x4c/0x60 [ 44.274822][ T7245] do_syscall_64+0xcc/0x370 [ 44.279316][ T7245] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.285196][ T7245] [ 44.287504][ T7245] Reported by Kernel Concurrency Sanitizer on: [ 44.293662][ T7245] CPU: 1 PID: 7245 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.301106][ T7245] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.311299][ T7245] ================================================================== [ 44.319365][ T7245] Kernel panic - not syncing: panic_on_warn set ... [ 44.326033][ T7245] CPU: 1 PID: 7245 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.333468][ T7245] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.343513][ T7245] Call Trace: [ 44.346795][ T7245] dump_stack+0xf5/0x159 [ 44.351025][ T7245] panic+0x210/0x640 [ 44.355009][ T7245] ? ksys_read+0xd5/0x1b0 [ 44.359319][ T7245] ? vprintk_func+0x8d/0x140 [ 44.363893][ T7245] kcsan_report.cold+0xc/0x10 [ 44.368554][ T7245] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 44.374075][ T7245] __tsan_write4+0x32/0x40 [ 44.378471][ T7245] tcp_rcv_space_adjust+0x40f/0x4c0 [ 44.383651][ T7245] tcp_recvmsg+0xdaa/0x1a30 [ 44.388136][ T7245] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 44.393776][ T7245] inet_recvmsg+0xbb/0x250 [ 44.398193][ T7245] ? __tsan_read8+0x2c/0x30 [ 44.402840][ T7245] ? inet_sendpage+0x100/0x100 [ 44.407596][ T7245] sock_recvmsg+0x92/0xb0 [ 44.411931][ T7245] sock_read_iter+0x15f/0x1e0 [ 44.416613][ T7245] new_sync_read+0x389/0x4f0 [ 44.421254][ T7245] __vfs_read+0xb1/0xc0 [ 44.425394][ T7245] vfs_read+0x143/0x2c0 [ 44.429533][ T7245] ksys_read+0xd5/0x1b0 [ 44.433668][ T7245] __x64_sys_read+0x4c/0x60 [ 44.438166][ T7245] do_syscall_64+0xcc/0x370 [ 44.442652][ T7245] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.448520][ T7245] RIP: 0033:0x47c530 [ 44.452397][ T7245] 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 [ 44.472751][ T7245] RSP: 002b:000000c4204e97d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 44.481476][ T7245] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 44.489450][ T7245] RDX: 0000000000001000 RSI: 000000c4201e8000 RDI: 0000000000000003 [ 44.497425][ T7245] RBP: 000000c4204e9830 R08: 0000000000000000 R09: 0000000000000000 [ 44.505409][ T7245] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 44.513513][ T7245] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 44.522970][ T7245] Kernel Offset: disabled [ 44.527296][ T7245] Rebooting in 86400 seconds..