[info] Using makefile-style concurrent boot in runlevel 2. [ 42.297314][ T26] audit: type=1800 audit(1574797853.643:21): pid=7442 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 42.346900][ T26] audit: type=1800 audit(1574797853.643:22): pid=7442 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. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.190' (ECDSA) to the list of known hosts. 2019/11/26 19:51:06 fuzzer started 2019/11/26 19:51:07 dialing manager at 10.128.0.105:46511 2019/11/26 19:51:07 syscalls: 2566 2019/11/26 19:51:07 code coverage: enabled 2019/11/26 19:51:07 comparison tracing: enabled 2019/11/26 19:51:07 extra coverage: extra coverage is not supported by the kernel 2019/11/26 19:51:07 setuid sandbox: enabled 2019/11/26 19:51:07 namespace sandbox: enabled 2019/11/26 19:51:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/26 19:51:07 fault injection: enabled 2019/11/26 19:51:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/26 19:51:07 net packet injection: enabled 2019/11/26 19:51:07 net device setup: enabled 2019/11/26 19:51:07 concurrency sanitizer: enabled 2019/11/26 19:51:07 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/26 19:51:08 adding functions to KCSAN blacklist: 'add_timer' '__hrtimer_run_queues' 'find_next_bit' 'tomoyo_supervisor' syzkaller login: [ 57.206435][ T7605] ================================================================== [ 57.214668][ T7605] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 57.221668][ T7605] [ 57.223993][ T7605] write to 0xffff8881267d69f8 of 8 bytes by interrupt on cpu 1: [ 57.231643][ T7605] tcp_add_backlog+0x476/0xce0 [ 57.236518][ T7605] tcp_v4_rcv+0x1a70/0x1bd0 [ 57.241033][ T7605] ip_protocol_deliver_rcu+0x4d/0x420 [ 57.246393][ T7605] ip_local_deliver_finish+0x110/0x140 [ 57.251835][ T7605] ip_local_deliver+0x133/0x210 [ 57.256669][ T7605] ip_rcv_finish+0x121/0x160 [ 57.261249][ T7605] ip_rcv+0x18f/0x1a0 [ 57.265211][ T7605] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.270925][ T7605] __netif_receive_skb+0x37/0xf0 [ 57.275840][ T7605] netif_receive_skb_internal+0x59/0x190 [ 57.281458][ T7605] napi_gro_receive+0x28f/0x330 [ 57.286303][ T7605] receive_buf+0x284/0x30b0 [ 57.290787][ T7605] virtnet_poll+0x436/0x7d0 [ 57.295266][ T7605] net_rx_action+0x3ae/0xa90 [ 57.299840][ T7605] __do_softirq+0x115/0x33f [ 57.304324][ T7605] run_ksoftirqd+0x46/0x60 [ 57.308719][ T7605] smpboot_thread_fn+0x37d/0x4a0 [ 57.313645][ T7605] kthread+0x1d4/0x200 [ 57.317695][ T7605] ret_from_fork+0x1f/0x30 [ 57.322080][ T7605] [ 57.324408][ T7605] read to 0xffff8881267d69f8 of 8 bytes by task 7605 on cpu 0: [ 57.331934][ T7605] tcp_recvmsg+0x46e/0x1b40 [ 57.336417][ T7605] inet_recvmsg+0xbb/0x250 [ 57.340814][ T7605] sock_recvmsg+0x92/0xb0 [ 57.345122][ T7605] sock_read_iter+0x15f/0x1e0 [ 57.349779][ T7605] new_sync_read+0x389/0x4f0 [ 57.354345][ T7605] __vfs_read+0xb1/0xc0 [ 57.358515][ T7605] vfs_read+0x143/0x2c0 [ 57.362660][ T7605] ksys_read+0xd5/0x1b0 [ 57.366805][ T7605] __x64_sys_read+0x4c/0x60 [ 57.371295][ T7605] do_syscall_64+0xcc/0x370 [ 57.375784][ T7605] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.381650][ T7605] [ 57.383959][ T7605] Reported by Kernel Concurrency Sanitizer on: [ 57.390099][ T7605] CPU: 0 PID: 7605 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 57.397963][ T7605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.407995][ T7605] ================================================================== [ 57.416032][ T7605] Kernel panic - not syncing: panic_on_warn set ... [ 57.422599][ T7605] CPU: 0 PID: 7605 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 57.430460][ T7605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.440493][ T7605] Call Trace: [ 57.443769][ T7605] dump_stack+0x11d/0x181 [ 57.448091][ T7605] panic+0x210/0x640 [ 57.451968][ T7605] ? vprintk_func+0x8d/0x140 [ 57.456543][ T7605] kcsan_report.cold+0xc/0xd [ 57.461128][ T7605] kcsan_setup_watchpoint+0x3fe/0x460 [ 57.466483][ T7605] __tsan_read8+0xc6/0x100 [ 57.470880][ T7605] tcp_recvmsg+0x46e/0x1b40 [ 57.475380][ T7605] ? rcu_preempt_deferred_qs_irqrestore+0x34f/0x580 [ 57.481973][ T7605] inet_recvmsg+0xbb/0x250 [ 57.486480][ T7605] ? apparmor_socket_recvmsg+0x3b/0x50 [ 57.491928][ T7605] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.498152][ T7605] ? security_socket_recvmsg+0x92/0xb0 [ 57.503609][ T7605] ? inet_sendpage+0x100/0x100 [ 57.508354][ T7605] sock_recvmsg+0x92/0xb0 [ 57.512664][ T7605] sock_read_iter+0x15f/0x1e0 [ 57.517337][ T7605] new_sync_read+0x389/0x4f0 [ 57.521923][ T7605] __vfs_read+0xb1/0xc0 [ 57.526060][ T7605] vfs_read+0x143/0x2c0 [ 57.530198][ T7605] ksys_read+0xd5/0x1b0 [ 57.534334][ T7605] __x64_sys_read+0x4c/0x60 [ 57.538820][ T7605] do_syscall_64+0xcc/0x370 [ 57.543317][ T7605] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.549190][ T7605] RIP: 0033:0x47c530 [ 57.553069][ T7605] 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 [ 57.572751][ T7605] RSP: 002b:000000c4203477d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 57.581141][ T7605] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.589092][ T7605] RDX: 0000000000001000 RSI: 000000c420052000 RDI: 0000000000000003 [ 57.597042][ T7605] RBP: 000000c420347830 R08: 0000000000000000 R09: 0000000000000000 [ 57.604990][ T7605] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 57.612938][ T7605] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 57.622149][ T7605] Kernel Offset: disabled [ 57.626646][ T7605] Rebooting in 86400 seconds..