[ 51.737270][ T26] audit: type=1800 audit(1574153598.845:27): pid=7423 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.757497][ T26] audit: type=1800 audit(1574153598.845:28): pid=7423 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 52.336660][ T26] audit: type=1800 audit(1574153599.525:29): pid=7423 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 52.364419][ T26] audit: type=1800 audit(1574153599.525:30): pid=7423 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.44' (ECDSA) to the list of known hosts. 2019/11/19 08:53:29 fuzzer started 2019/11/19 08:53:31 dialing manager at 10.128.0.105:42849 2019/11/19 08:53:31 syscalls: 2566 2019/11/19 08:53:31 code coverage: enabled 2019/11/19 08:53:31 comparison tracing: enabled 2019/11/19 08:53:31 extra coverage: extra coverage is not supported by the kernel 2019/11/19 08:53:31 setuid sandbox: enabled 2019/11/19 08:53:31 namespace sandbox: enabled 2019/11/19 08:53:31 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/19 08:53:31 fault injection: enabled 2019/11/19 08:53:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/19 08:53:31 net packet injection: enabled 2019/11/19 08:53:31 net device setup: enabled 2019/11/19 08:53:31 concurrency sanitizer: enabled 2019/11/19 08:53:31 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/19 08:53:31 adding functions to KCSAN blacklist: 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'tick_nohz_idle_stop_tick' 'tomoyo_supervisor' 'pipe_poll' 'do_syslog' 'ep_poll' 'pid_update_inode' '__hrtimer_run_queues' syzkaller login: [ 66.060942][ T7577] ================================================================== [ 66.069097][ T7577] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 66.076110][ T7577] [ 66.078443][ T7577] write to 0xffff8881248f92f8 of 8 bytes by interrupt on cpu 1: [ 66.086075][ T7577] tcp_add_backlog+0x476/0xce0 [ 66.090960][ T7577] tcp_v4_rcv+0x1a70/0x1bd0 [ 66.095444][ T7577] ip_protocol_deliver_rcu+0x4d/0x420 [ 66.100798][ T7577] ip_local_deliver_finish+0x110/0x140 [ 66.106237][ T7577] ip_local_deliver+0x133/0x210 [ 66.111129][ T7577] ip_rcv_finish+0x121/0x160 [ 66.115702][ T7577] ip_rcv+0x18f/0x1a0 [ 66.119664][ T7577] __netif_receive_skb_one_core+0xa7/0xe0 [ 66.125359][ T7577] __netif_receive_skb+0x37/0xf0 [ 66.130274][ T7577] netif_receive_skb_internal+0x59/0x190 [ 66.135890][ T7577] napi_gro_receive+0x28f/0x330 [ 66.140720][ T7577] receive_buf+0x284/0x30b0 [ 66.145200][ T7577] virtnet_poll+0x436/0x7d0 [ 66.149677][ T7577] net_rx_action+0x3ae/0xa90 [ 66.154252][ T7577] __do_softirq+0x115/0x33f [ 66.158770][ T7577] run_ksoftirqd+0x46/0x60 [ 66.163163][ T7577] smpboot_thread_fn+0x37d/0x4a0 [ 66.168077][ T7577] kthread+0x1d4/0x200 [ 66.172123][ T7577] ret_from_fork+0x1f/0x30 [ 66.176544][ T7577] [ 66.178855][ T7577] read to 0xffff8881248f92f8 of 8 bytes by task 7577 on cpu 0: [ 66.186409][ T7577] tcp_recvmsg+0x46e/0x1b40 [ 66.190891][ T7577] inet_recvmsg+0xbb/0x250 [ 66.195283][ T7577] sock_recvmsg+0x92/0xb0 [ 66.199589][ T7577] sock_read_iter+0x15f/0x1e0 [ 66.204258][ T7577] new_sync_read+0x389/0x4f0 [ 66.208834][ T7577] __vfs_read+0xb1/0xc0 [ 66.212971][ T7577] vfs_read+0x143/0x2c0 [ 66.217156][ T7577] ksys_read+0xd5/0x1b0 [ 66.221293][ T7577] __x64_sys_read+0x4c/0x60 [ 66.225777][ T7577] do_syscall_64+0xcc/0x370 [ 66.230259][ T7577] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.236119][ T7577] [ 66.238427][ T7577] Reported by Kernel Concurrency Sanitizer on: [ 66.244571][ T7577] CPU: 0 PID: 7577 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 66.252001][ T7577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.262029][ T7577] ================================================================== [ 66.270075][ T7577] Kernel panic - not syncing: panic_on_warn set ... [ 66.276652][ T7577] CPU: 0 PID: 7577 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 66.284085][ T7577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.294162][ T7577] Call Trace: [ 66.297448][ T7577] dump_stack+0x11d/0x181 [ 66.301915][ T7577] panic+0x210/0x640 [ 66.305805][ T7577] ? vprintk_func+0x8d/0x140 [ 66.310427][ T7577] kcsan_report.cold+0xc/0xd [ 66.315004][ T7577] kcsan_setup_watchpoint+0x3fe/0x460 [ 66.320366][ T7577] __tsan_read8+0xc6/0x100 [ 66.324771][ T7577] tcp_recvmsg+0x46e/0x1b40 [ 66.329269][ T7577] ? preempt_schedule_common+0x37/0x90 [ 66.334719][ T7577] inet_recvmsg+0xbb/0x250 [ 66.339118][ T7577] ? apparmor_socket_recvmsg+0x3b/0x50 [ 66.344632][ T7577] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.350856][ T7577] ? security_socket_recvmsg+0x92/0xb0 [ 66.356336][ T7577] ? inet_sendpage+0x100/0x100 [ 66.361082][ T7577] sock_recvmsg+0x92/0xb0 [ 66.365405][ T7577] sock_read_iter+0x15f/0x1e0 [ 66.370080][ T7577] new_sync_read+0x389/0x4f0 [ 66.374655][ T7577] __vfs_read+0xb1/0xc0 [ 66.378792][ T7577] vfs_read+0x143/0x2c0 [ 66.382952][ T7577] ksys_read+0xd5/0x1b0 [ 66.387086][ T7577] __x64_sys_read+0x4c/0x60 [ 66.391571][ T7577] do_syscall_64+0xcc/0x370 [ 66.396065][ T7577] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.401932][ T7577] RIP: 0033:0x47c530 [ 66.405825][ T7577] 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 [ 66.425421][ T7577] RSP: 002b:000000c4204dd7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 66.433823][ T7577] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 66.441773][ T7577] RDX: 0000000000001000 RSI: 000000c420358000 RDI: 0000000000000003 [ 66.449722][ T7577] RBP: 000000c4204dd830 R08: 0000000000000000 R09: 0000000000000000 [ 66.457670][ T7577] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 66.465632][ T7577] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 66.474942][ T7577] Kernel Offset: disabled [ 66.479267][ T7577] Rebooting in 86400 seconds..