[ 38.934688][ T25] audit: type=1800 audit(1571791425.163:25): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.963052][ T25] audit: type=1800 audit(1571791425.163:26): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.983222][ T25] audit: type=1800 audit(1571791425.163:27): pid=7045 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. [ 39.530056][ T7109] sshd (7109) 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 '10.128.0.238' (ECDSA) to the list of known hosts. 2019/10/23 00:43:56 fuzzer started 2019/10/23 00:43:57 dialing manager at 10.128.0.105:33369 2019/10/23 00:43:57 syscalls: 2524 2019/10/23 00:43:57 code coverage: enabled 2019/10/23 00:43:57 comparison tracing: enabled 2019/10/23 00:43:57 extra coverage: extra coverage is not supported by the kernel 2019/10/23 00:43:57 setuid sandbox: enabled 2019/10/23 00:43:57 namespace sandbox: enabled 2019/10/23 00:43:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 00:43:57 fault injection: enabled 2019/10/23 00:43:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 00:43:57 net packet injection: enabled 2019/10/23 00:43:57 net device setup: enabled 2019/10/23 00:43:57 concurrency sanitizer: enabled syzkaller login: [ 52.458466][ C0] ================================================================== [ 52.466591][ C0] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 52.473595][ C0] [ 52.475921][ C0] read to 0xffff8881224a52f8 of 8 bytes by task 7216 on cpu 1: [ 52.483461][ C0] tcp_recvmsg+0x470/0x1a30 [ 52.487973][ C0] inet_recvmsg+0xbb/0x250 [ 52.492378][ C0] sock_recvmsg+0x92/0xb0 [ 52.496723][ C0] sock_read_iter+0x15f/0x1e0 [ 52.501392][ C0] new_sync_read+0x389/0x4f0 [ 52.505968][ C0] __vfs_read+0xb1/0xc0 [ 52.510106][ C0] vfs_read+0x143/0x2c0 [ 52.514254][ C0] ksys_read+0xd5/0x1b0 [ 52.518394][ C0] __x64_sys_read+0x4c/0x60 [ 52.522881][ C0] do_syscall_64+0xcc/0x370 [ 52.527372][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.533236][ C0] [ 52.535634][ C0] write to 0xffff8881224a52f8 of 8 bytes by interrupt on cpu 0: [ 52.543262][ C0] tcp_add_backlog+0x45a/0xcc0 [ 52.548009][ C0] tcp_v4_rcv+0x1a60/0x1bb0 [ 52.552493][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 52.557846][ C0] ip_local_deliver_finish+0x110/0x140 [ 52.563286][ C0] ip_local_deliver+0x133/0x210 [ 52.568116][ C0] ip_rcv_finish+0x121/0x160 [ 52.572687][ C0] ip_rcv+0x18f/0x1a0 [ 52.576662][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 52.582383][ C0] __netif_receive_skb+0x37/0xf0 [ 52.587305][ C0] netif_receive_skb_internal+0x59/0x190 [ 52.592930][ C0] napi_gro_receive+0x28f/0x330 [ 52.597762][ C0] receive_buf+0x284/0x30b0 [ 52.602244][ C0] virtnet_poll+0x436/0x7d0 [ 52.606721][ C0] [ 52.609025][ C0] Reported by Kernel Concurrency Sanitizer on: [ 52.615163][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 52.622419][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.632456][ C0] ================================================================== [ 52.640506][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 52.647084][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 52.654345][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.664389][ C0] Call Trace: [ 52.667667][ C0] dump_stack+0xf5/0x159 [ 52.671893][ C0] panic+0x210/0x640 [ 52.675773][ C0] ? __netif_receive_skb+0x37/0xf0 [ 52.680869][ C0] ? vprintk_func+0x8d/0x140 [ 52.685471][ C0] kcsan_report.cold+0xc/0x10 [ 52.690133][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 52.695665][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 52.701370][ C0] __tsan_write8+0x32/0x40 [ 52.705769][ C0] tcp_add_backlog+0x45a/0xcc0 [ 52.710523][ C0] tcp_v4_rcv+0x1a60/0x1bb0 [ 52.715009][ C0] ? __tsan_read8+0x2c/0x30 [ 52.719519][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 52.724877][ C0] ip_local_deliver_finish+0x110/0x140 [ 52.730318][ C0] ip_local_deliver+0x133/0x210 [ 52.735153][ C0] ? ip_protocol_deliver_rcu+0x420/0x420 [ 52.740857][ C0] ip_rcv_finish+0x121/0x160 [ 52.745430][ C0] ip_rcv+0x18f/0x1a0 [ 52.749397][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 52.754326][ C0] ? ip_local_deliver+0x210/0x210 [ 52.759338][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 52.765044][ C0] __netif_receive_skb+0x37/0xf0 [ 52.769966][ C0] netif_receive_skb_internal+0x59/0x190 [ 52.775582][ C0] napi_gro_receive+0x28f/0x330 [ 52.780519][ C0] receive_buf+0x284/0x30b0 [ 52.785006][ C0] ? __tsan_write8+0x32/0x40 [ 52.789586][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 52.795029][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 52.800641][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 52.806258][ C0] virtnet_poll+0x436/0x7d0 [ 52.810756][ C0] net_rx_action+0x3ae/0xa90 [ 52.815338][ C0] __do_softirq+0x115/0x33f [ 52.819828][ C0] ? takeover_tasklets+0x250/0x250 [ 52.824931][ C0] run_ksoftirqd+0x46/0x60 [ 52.829346][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 52.834274][ C0] kthread+0x1d4/0x200 [ 52.838328][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 52.844290][ C0] ? kthread_stop+0x2d0/0x2d0 [ 52.848952][ C0] ret_from_fork+0x1f/0x30 [ 52.854658][ C0] Kernel Offset: disabled [ 52.858976][ C0] Rebooting in 86400 seconds..