[info] Using makefile-style concurrent boot in runlevel 2. [ 40.963813][ T26] audit: type=1800 audit(1575542568.470:21): pid=7352 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 40.993674][ T26] audit: type=1800 audit(1575542568.470:22): pid=7352 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 '10.128.0.146' (ECDSA) to the list of known hosts. 2019/12/05 10:42:59 fuzzer started 2019/12/05 10:43:00 dialing manager at 10.128.0.105:33795 2019/12/05 10:43:00 syscalls: 2684 2019/12/05 10:43:00 code coverage: enabled 2019/12/05 10:43:00 comparison tracing: enabled 2019/12/05 10:43:00 extra coverage: extra coverage is not supported by the kernel 2019/12/05 10:43:00 setuid sandbox: enabled 2019/12/05 10:43:00 namespace sandbox: enabled 2019/12/05 10:43:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/05 10:43:00 fault injection: enabled 2019/12/05 10:43:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/05 10:43:00 net packet injection: enabled 2019/12/05 10:43:00 net device setup: enabled 2019/12/05 10:43:00 concurrency sanitizer: enabled 2019/12/05 10:43:00 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/05 10:43:02 adding functions to KCSAN blacklist: 'blk_mq_sched_dispatch_requests' 'find_next_bit' '__snd_rawmidi_transmit_ack' '__hrtimer_run_queues' 'tomoyo_supervisor' 'pipe_poll' 'tick_do_update_jiffies64' syzkaller login: [ 54.836108][ T7502] ================================================================== [ 54.844238][ T7502] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 54.851230][ T7502] [ 54.853550][ T7502] write to 0xffff8881237de138 of 8 bytes by interrupt on cpu 1: [ 54.861159][ T7502] tcp_add_backlog+0x476/0xce0 [ 54.865910][ T7502] tcp_v4_rcv+0x1a70/0x1bd0 [ 54.870393][ T7502] ip_protocol_deliver_rcu+0x4d/0x420 [ 54.875743][ T7502] ip_local_deliver_finish+0x110/0x140 [ 54.881198][ T7502] ip_local_deliver+0x133/0x210 [ 54.886041][ T7502] ip_rcv_finish+0x121/0x160 [ 54.890608][ T7502] ip_rcv+0x18f/0x1a0 [ 54.894582][ T7502] __netif_receive_skb_one_core+0xa7/0xe0 [ 54.900279][ T7502] __netif_receive_skb+0x37/0xf0 [ 54.905195][ T7502] netif_receive_skb_internal+0x59/0x190 [ 54.910802][ T7502] napi_gro_receive+0x28f/0x330 [ 54.915630][ T7502] receive_buf+0x284/0x30b0 [ 54.920123][ T7502] virtnet_poll+0x436/0x7d0 [ 54.924604][ T7502] net_rx_action+0x3ae/0xa90 [ 54.929174][ T7502] __do_softirq+0x115/0x33f [ 54.933827][ T7502] run_ksoftirqd+0x46/0x60 [ 54.938221][ T7502] smpboot_thread_fn+0x37d/0x4a0 [ 54.943135][ T7502] kthread+0x1d4/0x200 [ 54.947353][ T7502] ret_from_fork+0x1f/0x30 [ 54.951741][ T7502] [ 54.954051][ T7502] read to 0xffff8881237de138 of 8 bytes by task 7502 on cpu 0: [ 54.965237][ T7502] tcp_recvmsg+0x46e/0x1b40 [ 54.969761][ T7502] inet_recvmsg+0xbb/0x250 [ 54.974185][ T7502] sock_recvmsg+0x92/0xb0 [ 54.978491][ T7502] sock_read_iter+0x15f/0x1e0 [ 54.983147][ T7502] new_sync_read+0x389/0x4f0 [ 54.987711][ T7502] __vfs_read+0xb1/0xc0 [ 54.991972][ T7502] vfs_read+0x143/0x2c0 [ 54.996134][ T7502] ksys_read+0xd5/0x1b0 [ 55.000307][ T7502] __x64_sys_read+0x4c/0x60 [ 55.004815][ T7502] do_syscall_64+0xcc/0x370 [ 55.009393][ T7502] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.015794][ T7502] [ 55.018127][ T7502] Reported by Kernel Concurrency Sanitizer on: [ 55.024383][ T7502] CPU: 0 PID: 7502 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.032703][ T7502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.042751][ T7502] ================================================================== [ 55.050804][ T7502] Kernel panic - not syncing: panic_on_warn set ... [ 55.057394][ T7502] CPU: 0 PID: 7502 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.065257][ T7502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.076260][ T7502] Call Trace: [ 55.079558][ T7502] dump_stack+0x11d/0x181 [ 55.083892][ T7502] panic+0x210/0x640 [ 55.087771][ T7502] ? vprintk_func+0x8d/0x140 [ 55.092343][ T7502] kcsan_report.cold+0xc/0xd [ 55.096929][ T7502] kcsan_setup_watchpoint+0x3fe/0x460 [ 55.102282][ T7502] __tsan_read8+0xc6/0x100 [ 55.106683][ T7502] tcp_recvmsg+0x46e/0x1b40 [ 55.111180][ T7502] inet_recvmsg+0xbb/0x250 [ 55.115579][ T7502] ? apparmor_socket_recvmsg+0x3b/0x50 [ 55.121018][ T7502] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.127239][ T7502] ? security_socket_recvmsg+0x92/0xb0 [ 55.132676][ T7502] ? inet_sendpage+0x100/0x100 [ 55.137429][ T7502] sock_recvmsg+0x92/0xb0 [ 55.141737][ T7502] sock_read_iter+0x15f/0x1e0 [ 55.146398][ T7502] new_sync_read+0x389/0x4f0 [ 55.151058][ T7502] __vfs_read+0xb1/0xc0 [ 55.155206][ T7502] vfs_read+0x143/0x2c0 [ 55.159351][ T7502] ksys_read+0xd5/0x1b0 [ 55.163491][ T7502] __x64_sys_read+0x4c/0x60 [ 55.167978][ T7502] do_syscall_64+0xcc/0x370 [ 55.172473][ T7502] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.178366][ T7502] RIP: 0033:0x47c530 [ 55.182246][ T7502] 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 [ 55.202098][ T7502] RSP: 002b:000000c4202eb7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 55.210507][ T7502] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 55.218475][ T7502] RDX: 0000000000001000 RSI: 000000c420198000 RDI: 0000000000000003 [ 55.226443][ T7502] RBP: 000000c4202eb830 R08: 0000000000000000 R09: 0000000000000000 [ 55.234499][ T7502] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000002 [ 55.242455][ T7502] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 55.251667][ T7502] Kernel Offset: disabled [ 55.256006][ T7502] Rebooting in 86400 seconds..