[ 35.478635][ T25] audit: type=1800 audit(1571765141.387:24): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.938878][ T25] audit: type=1800 audit(1571765141.927:25): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.965913][ T25] audit: type=1800 audit(1571765141.927:26): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.162' (ECDSA) to the list of known hosts. 2019/10/22 17:25:49 fuzzer started 2019/10/22 17:25:51 dialing manager at 10.128.0.105:33369 2019/10/22 17:25:51 syscalls: 2524 2019/10/22 17:25:51 code coverage: enabled 2019/10/22 17:25:51 comparison tracing: enabled 2019/10/22 17:25:51 extra coverage: extra coverage is not supported by the kernel 2019/10/22 17:25:51 setuid sandbox: enabled 2019/10/22 17:25:51 namespace sandbox: enabled 2019/10/22 17:25:51 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 17:25:51 fault injection: enabled 2019/10/22 17:25:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 17:25:51 net packet injection: enabled 2019/10/22 17:25:51 net device setup: enabled 2019/10/22 17:25:51 concurrency sanitizer: enabled syzkaller login: [ 45.405032][ C1] ================================================================== [ 45.413137][ C1] BUG: KCSAN: data-race in __tcp_select_window / tcp_add_backlog [ 45.420831][ C1] [ 45.423143][ C1] read to 0xffff888126ff0a2c of 4 bytes by task 7289 on cpu 0: [ 45.430681][ C1] __tcp_select_window+0x6b/0x4d0 [ 45.436122][ C1] __tcp_transmit_skb+0x700/0x1d60 [ 45.441216][ C1] __tcp_send_ack+0x246/0x300 [ 45.445881][ C1] tcp_send_ack+0x34/0x40 [ 45.450191][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 45.455035][ C1] tcp_recvmsg+0x633/0x1a30 [ 45.459517][ C1] inet_recvmsg+0xbb/0x250 [ 45.463922][ C1] sock_recvmsg+0x92/0xb0 [ 45.468231][ C1] sock_read_iter+0x15f/0x1e0 [ 45.472887][ C1] new_sync_read+0x389/0x4f0 [ 45.477456][ C1] __vfs_read+0xb1/0xc0 [ 45.481591][ C1] vfs_read+0x143/0x2c0 [ 45.485727][ C1] ksys_read+0xd5/0x1b0 [ 45.489870][ C1] __x64_sys_read+0x4c/0x60 [ 45.494431][ C1] [ 45.496749][ C1] write to 0xffff888126ff0a2c of 4 bytes by interrupt on cpu 1: [ 45.504363][ C1] tcp_add_backlog+0x4a0/0xcc0 [ 45.509108][ C1] tcp_v4_rcv+0x1a60/0x1bb0 [ 45.513590][ C1] ip_protocol_deliver_rcu+0x4d/0x420 [ 45.518943][ C1] ip_local_deliver_finish+0x110/0x140 [ 45.524389][ C1] ip_local_deliver+0x133/0x210 [ 45.529222][ C1] ip_rcv_finish+0x121/0x160 [ 45.533796][ C1] ip_rcv+0x18f/0x1a0 [ 45.537773][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.543474][ C1] __netif_receive_skb+0x37/0xf0 [ 45.548393][ C1] netif_receive_skb_internal+0x59/0x190 [ 45.554008][ C1] napi_gro_receive+0x28f/0x330 [ 45.558841][ C1] receive_buf+0x284/0x30b0 [ 45.563325][ C1] virtnet_poll+0x436/0x7d0 [ 45.567799][ C1] [ 45.570111][ C1] Reported by Kernel Concurrency Sanitizer on: [ 45.576248][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 45.583591][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.593633][ C1] ================================================================== [ 45.601672][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 45.608242][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 45.615589][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.625622][ C1] Call Trace: [ 45.628901][ C1] dump_stack+0xf5/0x159 [ 45.633130][ C1] panic+0x210/0x640 [ 45.637010][ C1] ? __netif_receive_skb+0x37/0xf0 [ 45.642104][ C1] ? vprintk_func+0x8d/0x140 [ 45.646678][ C1] kcsan_report.cold+0xc/0x10 [ 45.651340][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.656876][ C1] __tsan_write4+0x32/0x40 [ 45.661276][ C1] tcp_add_backlog+0x4a0/0xcc0 [ 45.666030][ C1] tcp_v4_rcv+0x1a60/0x1bb0 [ 45.670527][ C1] ? __tsan_read8+0x2c/0x30 [ 45.675021][ C1] ip_protocol_deliver_rcu+0x4d/0x420 [ 45.680378][ C1] ip_local_deliver_finish+0x110/0x140 [ 45.685818][ C1] ip_local_deliver+0x133/0x210 [ 45.690651][ C1] ? ip_protocol_deliver_rcu+0x420/0x420 [ 45.696270][ C1] ip_rcv_finish+0x121/0x160 [ 45.700846][ C1] ip_rcv+0x18f/0x1a0 [ 45.704819][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 45.709649][ C1] ? ip_local_deliver+0x210/0x210 [ 45.714658][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.720361][ C1] __netif_receive_skb+0x37/0xf0 [ 45.725284][ C1] netif_receive_skb_internal+0x59/0x190 [ 45.730900][ C1] napi_gro_receive+0x28f/0x330 [ 45.735738][ C1] receive_buf+0x284/0x30b0 [ 45.740227][ C1] ? __tsan_write8+0x32/0x40 [ 45.744814][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 45.750262][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.755896][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.761521][ C1] virtnet_poll+0x436/0x7d0 [ 45.766016][ C1] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 45.771726][ C1] net_rx_action+0x3ae/0xa90 [ 45.776311][ C1] __do_softirq+0x115/0x33f [ 45.780802][ C1] ? takeover_tasklets+0x250/0x250 [ 45.785898][ C1] run_ksoftirqd+0x46/0x60 [ 45.790296][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 45.795219][ C1] kthread+0x1d4/0x200 [ 45.799270][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 45.805232][ C1] ? kthread_stop+0x2d0/0x2d0 [ 45.809892][ C1] ret_from_fork+0x1f/0x30 [ 45.815535][ C1] Kernel Offset: disabled [ 45.819860][ C1] Rebooting in 86400 seconds..