[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.659890][ T25] audit: type=1800 audit(1570946244.193:25): pid=7084 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.698401][ T25] audit: type=1800 audit(1570946244.193:26): pid=7084 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.731886][ T25] audit: type=1800 audit(1570946244.193:27): pid=7084 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 '10.128.10.33' (ECDSA) to the list of known hosts. 2019/10/13 05:57:34 fuzzer started 2019/10/13 05:57:35 dialing manager at 10.128.0.105:43913 2019/10/13 05:57:35 syscalls: 2523 2019/10/13 05:57:35 code coverage: enabled 2019/10/13 05:57:35 comparison tracing: enabled 2019/10/13 05:57:35 extra coverage: extra coverage is not supported by the kernel 2019/10/13 05:57:35 setuid sandbox: enabled 2019/10/13 05:57:35 namespace sandbox: enabled 2019/10/13 05:57:35 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 05:57:35 fault injection: enabled 2019/10/13 05:57:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 05:57:35 net packet injection: enabled 2019/10/13 05:57:35 net device setup: enabled 2019/10/13 05:57:35 concurrency sanitizer: enabled syzkaller login: [ 53.621824][ T7232] ================================================================== [ 53.630091][ T7232] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 53.637872][ T7232] [ 53.640211][ T7232] read to 0xffff88811efd014c of 4 bytes by interrupt on cpu 1: [ 53.647753][ T7232] tcp_add_backlog+0x43/0xcc0 [ 53.652410][ T7232] tcp_v4_rcv+0x1aba/0x1bf0 [ 53.656929][ T7232] ip_protocol_deliver_rcu+0x51/0x470 [ 53.662278][ T7232] ip_local_deliver_finish+0x110/0x140 [ 53.667714][ T7232] ip_local_deliver+0x133/0x210 [ 53.672537][ T7232] ip_rcv_finish+0x121/0x160 [ 53.677099][ T7232] ip_rcv+0x18f/0x1a0 [ 53.681069][ T7232] __netif_receive_skb_one_core+0xa7/0xe0 [ 53.686774][ T7232] __netif_receive_skb+0x37/0xf0 [ 53.691694][ T7232] netif_receive_skb_internal+0x59/0x190 [ 53.697358][ T7232] napi_gro_receive+0x28f/0x330 [ 53.702230][ T7232] receive_buf+0x284/0x30b0 [ 53.706724][ T7232] virtnet_poll+0x436/0x7d0 [ 53.711204][ T7232] net_rx_action+0x3ae/0xa50 [ 53.715764][ T7232] [ 53.718078][ T7232] write to 0xffff88811efd014c of 4 bytes by task 7232 on cpu 0: [ 53.725688][ T7232] tcp_rcv_space_adjust+0x40f/0x4c0 [ 53.730863][ T7232] tcp_recvmsg+0xdaa/0x1a30 [ 53.735342][ T7232] inet_recvmsg+0xbb/0x250 [ 53.739735][ T7232] sock_recvmsg+0x92/0xb0 [ 53.744037][ T7232] sock_read_iter+0x15f/0x1e0 [ 53.748691][ T7232] new_sync_read+0x389/0x4f0 [ 53.753265][ T7232] __vfs_read+0xb1/0xc0 [ 53.757396][ T7232] vfs_read+0x143/0x2c0 [ 53.761538][ T7232] ksys_read+0xd5/0x1b0 [ 53.765669][ T7232] __x64_sys_read+0x4c/0x60 [ 53.770152][ T7232] do_syscall_64+0xcf/0x2f0 [ 53.774644][ T7232] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.780509][ T7232] [ 53.782811][ T7232] Reported by Kernel Concurrency Sanitizer on: [ 53.788939][ T7232] CPU: 0 PID: 7232 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.796021][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.806060][ T7232] ================================================================== [ 53.814095][ T7232] Kernel panic - not syncing: panic_on_warn set ... [ 53.820657][ T7232] CPU: 0 PID: 7232 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.827745][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.837777][ T7232] Call Trace: [ 53.841050][ T7232] dump_stack+0xf5/0x159 [ 53.845287][ T7232] panic+0x209/0x639 [ 53.849231][ T7232] ? ksys_read+0xd5/0x1b0 [ 53.853548][ T7232] ? vprintk_func+0x8d/0x140 [ 53.858127][ T7232] kcsan_report.cold+0xc/0x1b [ 53.862798][ T7232] __kcsan_setup_watchpoint+0x3ee/0x510 [ 53.868343][ T7232] __tsan_write4+0x32/0x40 [ 53.872755][ T7232] tcp_rcv_space_adjust+0x40f/0x4c0 [ 53.877939][ T7232] tcp_recvmsg+0xdaa/0x1a30 [ 53.882434][ T7232] ? debug_smp_processor_id+0x4c/0x172 [ 53.887885][ T7232] ? __kcsan_setup_watchpoint+0x96/0x510 [ 53.893507][ T7232] inet_recvmsg+0xbb/0x250 [ 53.897908][ T7232] ? __tsan_read8+0x2c/0x30 [ 53.902531][ T7232] ? inet_sendpage+0x100/0x100 [ 53.907310][ T7232] sock_recvmsg+0x92/0xb0 [ 53.911799][ T7232] sock_read_iter+0x15f/0x1e0 [ 53.916511][ T7232] new_sync_read+0x389/0x4f0 [ 53.921094][ T7232] __vfs_read+0xb1/0xc0 [ 53.925237][ T7232] vfs_read+0x143/0x2c0 [ 53.929377][ T7232] ksys_read+0xd5/0x1b0 [ 53.933528][ T7232] __x64_sys_read+0x4c/0x60 [ 53.938029][ T7232] do_syscall_64+0xcf/0x2f0 [ 53.942551][ T7232] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.948431][ T7232] RIP: 0033:0x47c530 [ 53.952348][ T7232] 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 [ 53.971942][ T7232] RSP: 002b:000000c4203ab7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.980331][ T7232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.988288][ T7232] RDX: 0000000000001000 RSI: 000000c420190000 RDI: 0000000000000003 [ 53.996381][ T7232] RBP: 000000c4203ab830 R08: 0000000000000000 R09: 0000000000000000 [ 54.004344][ T7232] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 54.012387][ T7232] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 54.021807][ T7232] Kernel Offset: disabled [ 54.026146][ T7232] Rebooting in 86400 seconds..