[ 57.537722][ T25] audit: type=1800 audit(1573338774.776:27): pid=7725 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 57.561287][ T25] audit: type=1800 audit(1573338774.786:28): pid=7725 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. [ 58.113863][ T25] audit: type=1800 audit(1573338775.436:29): pid=7725 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 [ 58.133900][ T25] audit: type=1800 audit(1573338775.436:30): pid=7725 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 '10.128.0.182' (ECDSA) to the list of known hosts. 2019/11/09 22:33:04 fuzzer started 2019/11/09 22:33:06 dialing manager at 10.128.0.105:33901 2019/11/09 22:33:06 syscalls: 2553 2019/11/09 22:33:06 code coverage: enabled 2019/11/09 22:33:06 comparison tracing: enabled 2019/11/09 22:33:06 extra coverage: extra coverage is not supported by the kernel 2019/11/09 22:33:06 setuid sandbox: enabled 2019/11/09 22:33:06 namespace sandbox: enabled 2019/11/09 22:33:06 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/09 22:33:06 fault injection: enabled 2019/11/09 22:33:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/09 22:33:06 net packet injection: enabled 2019/11/09 22:33:06 net device setup: enabled 2019/11/09 22:33:06 concurrency sanitizer: enabled 2019/11/09 22:33:06 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/09 22:33:06 adding functions to KCSAN blacklist: 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' 'wbt_issue' 'run_timer_softirq' '__hrtimer_run_queues' 'tomoyo_supervisor' syzkaller login: [ 69.465307][ T7884] ================================================================== [ 69.473453][ T7884] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 69.480528][ T7884] [ 69.482840][ T7884] write to 0xffff888126498178 of 8 bytes by interrupt on cpu 1: [ 69.490461][ T7884] tcp_add_backlog+0x476/0xce0 [ 69.495205][ T7884] tcp_v4_rcv+0x1a70/0x1bd0 [ 69.499691][ T7884] ip_protocol_deliver_rcu+0x4d/0x420 [ 69.505043][ T7884] ip_local_deliver_finish+0x110/0x140 [ 69.510483][ T7884] ip_local_deliver+0x133/0x210 [ 69.515313][ T7884] ip_rcv_finish+0x121/0x160 [ 69.520008][ T7884] ip_rcv+0x18f/0x1a0 [ 69.523975][ T7884] __netif_receive_skb_one_core+0xa7/0xe0 [ 69.529767][ T7884] __netif_receive_skb+0x37/0xf0 [ 69.534688][ T7884] netif_receive_skb_internal+0x59/0x190 [ 69.540360][ T7884] napi_gro_receive+0x28f/0x330 [ 69.545203][ T7884] receive_buf+0x284/0x30b0 [ 69.549688][ T7884] virtnet_poll+0x436/0x7d0 [ 69.554186][ T7884] net_rx_action+0x3ae/0xa90 [ 69.558770][ T7884] __do_softirq+0x115/0x33f [ 69.563259][ T7884] irq_exit+0xbb/0xe0 [ 69.567224][ T7884] do_IRQ+0xa6/0x180 [ 69.571102][ T7884] ret_from_intr+0x0/0x19 [ 69.575410][ T7884] native_safe_halt+0xe/0x10 [ 69.579981][ T7884] arch_cpu_idle+0x1f/0x30 [ 69.584400][ T7884] default_idle_call+0x1e/0x40 [ 69.589153][ T7884] do_idle+0x1af/0x280 [ 69.593220][ T7884] cpu_startup_entry+0x1b/0x20 [ 69.598051][ T7884] start_secondary+0x208/0x260 [ 69.602799][ T7884] secondary_startup_64+0xa4/0xb0 [ 69.607796][ T7884] [ 69.610108][ T7884] read to 0xffff888126498178 of 8 bytes by task 7884 on cpu 0: [ 69.617633][ T7884] tcp_recvmsg+0x46e/0x1b40 [ 69.622134][ T7884] inet_recvmsg+0xbb/0x250 [ 69.626536][ T7884] sock_recvmsg+0x92/0xb0 [ 69.630849][ T7884] sock_read_iter+0x15f/0x1e0 [ 69.635510][ T7884] new_sync_read+0x389/0x4f0 [ 69.640171][ T7884] __vfs_read+0xb1/0xc0 [ 69.644312][ T7884] vfs_read+0x143/0x2c0 [ 69.648447][ T7884] ksys_read+0xd5/0x1b0 [ 69.652591][ T7884] __x64_sys_read+0x4c/0x60 [ 69.657087][ T7884] do_syscall_64+0xcc/0x370 [ 69.661595][ T7884] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.667458][ T7884] [ 69.669773][ T7884] Reported by Kernel Concurrency Sanitizer on: [ 69.676014][ T7884] CPU: 0 PID: 7884 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 69.683446][ T7884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.693481][ T7884] ================================================================== [ 69.701522][ T7884] Kernel panic - not syncing: panic_on_warn set ... [ 69.708093][ T7884] CPU: 0 PID: 7884 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 69.715667][ T7884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.725709][ T7884] Call Trace: [ 69.729005][ T7884] dump_stack+0xf5/0x159 [ 69.733525][ T7884] panic+0x210/0x640 [ 69.737932][ T7884] ? vprintk_func+0x8d/0x140 [ 69.742510][ T7884] kcsan_report.cold+0xc/0xe [ 69.747091][ T7884] kcsan_setup_watchpoint+0x3fe/0x410 [ 69.752454][ T7884] __tsan_read8+0x145/0x1f0 [ 69.756941][ T7884] tcp_recvmsg+0x46e/0x1b40 [ 69.761444][ T7884] inet_recvmsg+0xbb/0x250 [ 69.765857][ T7884] ? apparmor_socket_recvmsg+0x3b/0x50 [ 69.771301][ T7884] ? security_socket_recvmsg+0x92/0xb0 [ 69.776742][ T7884] ? inet_sendpage+0x100/0x100 [ 69.781514][ T7884] sock_recvmsg+0x92/0xb0 [ 69.785857][ T7884] sock_read_iter+0x15f/0x1e0 [ 69.790534][ T7884] new_sync_read+0x389/0x4f0 [ 69.795118][ T7884] __vfs_read+0xb1/0xc0 [ 69.799311][ T7884] vfs_read+0x143/0x2c0 [ 69.803458][ T7884] ksys_read+0xd5/0x1b0 [ 69.807649][ T7884] __x64_sys_read+0x4c/0x60 [ 69.812146][ T7884] do_syscall_64+0xcc/0x370 [ 69.816643][ T7884] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.822544][ T7884] RIP: 0033:0x47c530 [ 69.826429][ T7884] 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 [ 69.846026][ T7884] RSP: 002b:000000c4204ff7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 69.854780][ T7884] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 69.862738][ T7884] RDX: 0000000000001000 RSI: 000000c420330000 RDI: 0000000000000003 [ 69.870868][ T7884] RBP: 000000c4204ff830 R08: 0000000000000000 R09: 0000000000000000 [ 69.878820][ T7884] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020 [ 69.886775][ T7884] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 69.896275][ T7884] Kernel Offset: disabled [ 69.900603][ T7884] Rebooting in 86400 seconds..