[ 41.577151][ T26] audit: type=1800 audit(1575950346.682:21): pid=7467 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.629295][ T26] audit: type=1800 audit(1575950346.682:22): pid=7467 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 42.807258][ T7530] sshd (7530) used greatest stack depth: 10128 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts. 2019/12/10 03:59:17 fuzzer started 2019/12/10 03:59:19 dialing manager at 10.128.0.105:43773 2019/12/10 03:59:19 syscalls: 2689 2019/12/10 03:59:19 code coverage: enabled 2019/12/10 03:59:19 comparison tracing: enabled 2019/12/10 03:59:19 extra coverage: extra coverage is not supported by the kernel 2019/12/10 03:59:19 setuid sandbox: enabled 2019/12/10 03:59:19 namespace sandbox: enabled 2019/12/10 03:59:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/10 03:59:19 fault injection: enabled 2019/12/10 03:59:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/10 03:59:19 net packet injection: enabled 2019/12/10 03:59:19 net device setup: enabled 2019/12/10 03:59:19 concurrency sanitizer: enabled 2019/12/10 03:59:19 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/10 03:59:20 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'tomoyo_supervisor' 'ext4_nonda_switch' 'taskstats_exit' syzkaller login: [ 54.993270][ T7636] ================================================================== [ 55.001420][ T7636] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 55.008465][ T7636] [ 55.010775][ T7636] write to 0xffff8881232972f8 of 8 bytes by interrupt on cpu 0: [ 55.018388][ T7636] tcp_add_backlog+0x476/0xce0 [ 55.023128][ T7636] tcp_v4_rcv+0x1a70/0x1bd0 [ 55.027668][ T7636] ip_protocol_deliver_rcu+0x4d/0x420 [ 55.033022][ T7636] ip_local_deliver_finish+0x110/0x140 [ 55.038499][ T7636] ip_local_deliver+0x133/0x210 [ 55.043340][ T7636] ip_rcv_finish+0x121/0x160 [ 55.047910][ T7636] ip_rcv+0x18f/0x1a0 [ 55.051870][ T7636] __netif_receive_skb_one_core+0xa7/0xe0 [ 55.057589][ T7636] __netif_receive_skb+0x37/0xf0 [ 55.062530][ T7636] netif_receive_skb_internal+0x59/0x190 [ 55.068142][ T7636] napi_gro_receive+0x28f/0x330 [ 55.073471][ T7636] receive_buf+0x284/0x30b0 [ 55.077964][ T7636] virtnet_poll+0x436/0x7d0 [ 55.082444][ T7636] net_rx_action+0x3ae/0xa90 [ 55.087039][ T7636] __do_softirq+0x115/0x33f [ 55.091521][ T7636] run_ksoftirqd+0x46/0x60 [ 55.095914][ T7636] smpboot_thread_fn+0x37d/0x4a0 [ 55.100830][ T7636] kthread+0x1d4/0x200 [ 55.104891][ T7636] ret_from_fork+0x1f/0x30 [ 55.109277][ T7636] [ 55.111593][ T7636] read to 0xffff8881232972f8 of 8 bytes by task 7636 on cpu 1: [ 55.119113][ T7636] tcp_recvmsg+0x46e/0x1b40 [ 55.123608][ T7636] inet_recvmsg+0xbb/0x250 [ 55.128001][ T7636] sock_recvmsg+0x92/0xb0 [ 55.132305][ T7636] sock_read_iter+0x15f/0x1e0 [ 55.136971][ T7636] new_sync_read+0x389/0x4f0 [ 55.141536][ T7636] __vfs_read+0xb1/0xc0 [ 55.145669][ T7636] vfs_read+0x143/0x2c0 [ 55.149802][ T7636] ksys_read+0xd5/0x1b0 [ 55.153934][ T7636] __x64_sys_read+0x4c/0x60 [ 55.158418][ T7636] do_syscall_64+0xcc/0x370 [ 55.162910][ T7636] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.168775][ T7636] [ 55.171095][ T7636] Reported by Kernel Concurrency Sanitizer on: [ 55.177231][ T7636] CPU: 1 PID: 7636 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.185095][ T7636] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.195125][ T7636] ================================================================== [ 55.203179][ T7636] Kernel panic - not syncing: panic_on_warn set ... [ 55.209744][ T7636] CPU: 1 PID: 7636 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.217618][ T7636] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.227661][ T7636] Call Trace: [ 55.230939][ T7636] dump_stack+0x11d/0x181 [ 55.235252][ T7636] panic+0x210/0x640 [ 55.239128][ T7636] ? vprintk_func+0x8d/0x140 [ 55.243701][ T7636] kcsan_report.cold+0xc/0xd [ 55.248274][ T7636] kcsan_setup_watchpoint+0x3fe/0x460 [ 55.253629][ T7636] __tsan_read8+0xc6/0x100 [ 55.258070][ T7636] tcp_recvmsg+0x46e/0x1b40 [ 55.262576][ T7636] inet_recvmsg+0xbb/0x250 [ 55.266974][ T7636] ? apparmor_socket_recvmsg+0x3b/0x50 [ 55.272413][ T7636] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.278646][ T7636] ? security_socket_recvmsg+0x92/0xb0 [ 55.284086][ T7636] ? inet_sendpage+0x100/0x100 [ 55.288841][ T7636] sock_recvmsg+0x92/0xb0 [ 55.293170][ T7636] sock_read_iter+0x15f/0x1e0 [ 55.297830][ T7636] new_sync_read+0x389/0x4f0 [ 55.302405][ T7636] __vfs_read+0xb1/0xc0 [ 55.306554][ T7636] vfs_read+0x143/0x2c0 [ 55.310690][ T7636] ksys_read+0xd5/0x1b0 [ 55.314873][ T7636] __x64_sys_read+0x4c/0x60 [ 55.319359][ T7636] do_syscall_64+0xcc/0x370 [ 55.323842][ T7636] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.329729][ T7636] RIP: 0033:0x47c530 [ 55.333623][ T7636] 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 [ 55.353205][ T7636] RSP: 002b:000000c4202577d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 55.361613][ T7636] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 55.369562][ T7636] RDX: 0000000000001000 RSI: 000000c4203fa000 RDI: 0000000000000003 [ 55.377515][ T7636] RBP: 000000c420257830 R08: 0000000000000000 R09: 0000000000000000 [ 55.385481][ T7636] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 55.393432][ T7636] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 55.402792][ T7636] Kernel Offset: disabled [ 55.407129][ T7636] Rebooting in 86400 seconds..