[info] Using makefile-style concurrent boot in runlevel 2. [ 46.714300][ T26] audit: type=1800 audit(1574978888.154:21): pid=7388 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 46.754021][ T26] audit: type=1800 audit(1574978888.154:22): pid=7388 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 '10.128.0.148' (ECDSA) to the list of known hosts. 2019/11/28 22:08:16 fuzzer started 2019/11/28 22:08:17 dialing manager at 10.128.0.105:46851 2019/11/28 22:08:18 syscalls: 2589 2019/11/28 22:08:18 code coverage: enabled 2019/11/28 22:08:18 comparison tracing: enabled 2019/11/28 22:08:18 extra coverage: extra coverage is not supported by the kernel 2019/11/28 22:08:18 setuid sandbox: enabled 2019/11/28 22:08:18 namespace sandbox: enabled 2019/11/28 22:08:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/28 22:08:18 fault injection: enabled 2019/11/28 22:08:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/28 22:08:18 net packet injection: enabled 2019/11/28 22:08:18 net device setup: enabled 2019/11/28 22:08:18 concurrency sanitizer: enabled 2019/11/28 22:08:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/28 22:08:18 adding functions to KCSAN blacklist: 'wbt_done' 'wbt_issue' '__hrtimer_run_queues' 'blk_mq_dispatch_rq_list' 'tomoyo_supervisor' 'ep_poll' syzkaller login: [ 57.891456][ T7559] ================================================================== [ 57.899755][ T7559] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 57.906752][ T7559] [ 57.909069][ T7559] write to 0xffff88811fcd6138 of 8 bytes by interrupt on cpu 0: [ 57.916688][ T7559] tcp_add_backlog+0x476/0xce0 [ 57.921449][ T7559] tcp_v4_rcv+0x1a70/0x1bd0 [ 57.925933][ T7559] ip_protocol_deliver_rcu+0x4d/0x420 [ 57.931303][ T7559] ip_local_deliver_finish+0x110/0x140 [ 57.936748][ T7559] ip_local_deliver+0x133/0x210 [ 57.941581][ T7559] ip_rcv_finish+0x121/0x160 [ 57.946163][ T7559] ip_rcv+0x18f/0x1a0 [ 57.950129][ T7559] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.955829][ T7559] __netif_receive_skb+0x37/0xf0 [ 57.960757][ T7559] netif_receive_skb_internal+0x59/0x190 [ 57.966419][ T7559] napi_gro_receive+0x28f/0x330 [ 57.971277][ T7559] receive_buf+0x284/0x30b0 [ 57.975789][ T7559] virtnet_poll+0x436/0x7d0 [ 57.980310][ T7559] net_rx_action+0x3ae/0xa90 [ 57.984884][ T7559] __do_softirq+0x115/0x33f [ 57.989386][ T7559] run_ksoftirqd+0x46/0x60 [ 57.993779][ T7559] smpboot_thread_fn+0x37d/0x4a0 [ 57.998700][ T7559] kthread+0x1d4/0x200 [ 58.002785][ T7559] ret_from_fork+0x1f/0x30 [ 58.007172][ T7559] [ 58.009492][ T7559] read to 0xffff88811fcd6138 of 8 bytes by task 7559 on cpu 1: [ 58.017122][ T7559] tcp_recvmsg+0x46e/0x1b40 [ 58.021616][ T7559] inet_recvmsg+0xbb/0x250 [ 58.026013][ T7559] sock_recvmsg+0x92/0xb0 [ 58.030321][ T7559] sock_read_iter+0x15f/0x1e0 [ 58.034976][ T7559] new_sync_read+0x389/0x4f0 [ 58.039547][ T7559] __vfs_read+0xb1/0xc0 [ 58.043689][ T7559] vfs_read+0x143/0x2c0 [ 58.047821][ T7559] ksys_read+0xd5/0x1b0 [ 58.051967][ T7559] __x64_sys_read+0x4c/0x60 [ 58.056905][ T7559] do_syscall_64+0xcc/0x370 [ 58.061400][ T7559] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.067265][ T7559] [ 58.069577][ T7559] Reported by Kernel Concurrency Sanitizer on: [ 58.075723][ T7559] CPU: 1 PID: 7559 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 58.083593][ T7559] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.093630][ T7559] ================================================================== [ 58.101668][ T7559] Kernel panic - not syncing: panic_on_warn set ... [ 58.108235][ T7559] CPU: 1 PID: 7559 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 58.116094][ T7559] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.126135][ T7559] Call Trace: [ 58.129410][ T7559] dump_stack+0x11d/0x181 [ 58.133721][ T7559] panic+0x210/0x640 [ 58.137622][ T7559] ? vprintk_func+0x8d/0x140 [ 58.142210][ T7559] kcsan_report.cold+0xc/0xd [ 58.146794][ T7559] kcsan_setup_watchpoint+0x3fe/0x460 [ 58.152150][ T7559] __tsan_read8+0xc6/0x100 [ 58.156549][ T7559] tcp_recvmsg+0x46e/0x1b40 [ 58.161046][ T7559] inet_recvmsg+0xbb/0x250 [ 58.165441][ T7559] ? apparmor_socket_recvmsg+0x3b/0x50 [ 58.170901][ T7559] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.177125][ T7559] ? security_socket_recvmsg+0x92/0xb0 [ 58.182567][ T7559] ? inet_sendpage+0x100/0x100 [ 58.187314][ T7559] sock_recvmsg+0x92/0xb0 [ 58.191621][ T7559] sock_read_iter+0x15f/0x1e0 [ 58.196279][ T7559] new_sync_read+0x389/0x4f0 [ 58.200947][ T7559] __vfs_read+0xb1/0xc0 [ 58.205130][ T7559] vfs_read+0x143/0x2c0 [ 58.209274][ T7559] ksys_read+0xd5/0x1b0 [ 58.213430][ T7559] __x64_sys_read+0x4c/0x60 [ 58.217964][ T7559] do_syscall_64+0xcc/0x370 [ 58.222544][ T7559] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.228516][ T7559] RIP: 0033:0x47c530 [ 58.232395][ T7559] 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 [ 58.251989][ T7559] RSP: 002b:000000c420159850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 58.260392][ T7559] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 58.268367][ T7559] RDX: 0000000000001000 RSI: 000000c420312000 RDI: 0000000000000003 [ 58.276331][ T7559] RBP: 000000c4201598a8 R08: 0000000000000000 R09: 0000000000000000 [ 58.284283][ T7559] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 [ 58.292247][ T7559] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 58.301518][ T7559] Kernel Offset: disabled [ 58.305871][ T7559] Rebooting in 86400 seconds..