[info] Using makefile-style concurrent boot in runlevel 2. [ 42.517150][ T26] audit: type=1800 audit(1575746500.478:21): pid=7439 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 42.566171][ T26] audit: type=1800 audit(1575746500.478:22): pid=7439 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 '10.128.0.195' (ECDSA) to the list of known hosts. 2019/12/07 19:21:52 fuzzer started 2019/12/07 19:21:54 dialing manager at 10.128.0.105:38631 2019/12/07 19:21:54 syscalls: 2689 2019/12/07 19:21:54 code coverage: enabled 2019/12/07 19:21:54 comparison tracing: enabled 2019/12/07 19:21:54 extra coverage: extra coverage is not supported by the kernel 2019/12/07 19:21:54 setuid sandbox: enabled 2019/12/07 19:21:54 namespace sandbox: enabled 2019/12/07 19:21:54 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/07 19:21:54 fault injection: enabled 2019/12/07 19:21:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/07 19:21:54 net packet injection: enabled 2019/12/07 19:21:54 net device setup: enabled 2019/12/07 19:21:54 concurrency sanitizer: enabled 2019/12/07 19:21:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/07 19:21:55 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' 'ext4_nonda_switch' 'find_next_bit' 'tomoyo_supervisor' '__hrtimer_run_queues' 'rcu_gp_fqs_check_wake' 'ep_insert' 'mod_timer' syzkaller login: [ 57.916433][ C1] ================================================================== [ 57.925103][ C1] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 57.932118][ C1] [ 57.934433][ C1] read to 0xffff888126a672f8 of 8 bytes by task 7595 on cpu 0: [ 57.941973][ C1] tcp_recvmsg+0x46e/0x1b40 [ 57.946469][ C1] inet_recvmsg+0xbb/0x250 [ 57.950960][ C1] sock_recvmsg+0x92/0xb0 [ 57.955391][ C1] sock_read_iter+0x15f/0x1e0 [ 57.960073][ C1] new_sync_read+0x389/0x4f0 [ 57.965010][ C1] __vfs_read+0xb1/0xc0 [ 57.969289][ C1] vfs_read+0x143/0x2c0 [ 57.973437][ C1] ksys_read+0xd5/0x1b0 [ 57.977580][ C1] __x64_sys_read+0x4c/0x60 [ 57.982176][ C1] do_syscall_64+0xcc/0x370 [ 57.986677][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.992544][ C1] [ 57.994854][ C1] write to 0xffff888126a672f8 of 8 bytes by interrupt on cpu 1: [ 58.002638][ C1] tcp_add_backlog+0x476/0xce0 [ 58.007403][ C1] tcp_v4_rcv+0x1a70/0x1bd0 [ 58.011913][ C1] ip_protocol_deliver_rcu+0x4d/0x420 [ 58.017276][ C1] ip_local_deliver_finish+0x110/0x140 [ 58.022736][ C1] ip_local_deliver+0x133/0x210 [ 58.027575][ C1] ip_rcv_finish+0x121/0x160 [ 58.032595][ C1] ip_rcv+0x18f/0x1a0 [ 58.036573][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 58.042275][ C1] __netif_receive_skb+0x37/0xf0 [ 58.047209][ C1] netif_receive_skb_internal+0x59/0x190 [ 58.052820][ C1] napi_gro_receive+0x28f/0x330 [ 58.057684][ C1] receive_buf+0x284/0x30b0 [ 58.062180][ C1] virtnet_poll+0x436/0x7d0 [ 58.066663][ C1] net_rx_action+0x3ae/0xa90 [ 58.071236][ C1] __do_softirq+0x115/0x33f [ 58.075728][ C1] run_ksoftirqd+0x46/0x60 [ 58.080133][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 58.085127][ C1] kthread+0x1d4/0x200 [ 58.089212][ C1] ret_from_fork+0x1f/0x30 [ 58.093620][ C1] [ 58.095986][ C1] Reported by Kernel Concurrency Sanitizer on: [ 58.102246][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-syzkaller #0 [ 58.110046][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.120090][ C1] ================================================================== [ 58.128269][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 58.134875][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-syzkaller #0 [ 58.142659][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.152891][ C1] Call Trace: [ 58.156365][ C1] dump_stack+0x11d/0x181 [ 58.160694][ C1] panic+0x210/0x640 [ 58.164588][ C1] ? vprintk_func+0x8d/0x140 [ 58.169186][ C1] kcsan_report.cold+0xc/0xd [ 58.173793][ C1] kcsan_setup_watchpoint+0x3fe/0x460 [ 58.179178][ C1] __tsan_unaligned_write8+0xc4/0x100 [ 58.184640][ C1] tcp_add_backlog+0x476/0xce0 [ 58.189416][ C1] tcp_v4_rcv+0x1a70/0x1bd0 [ 58.193901][ C1] ? __read_once_size+0x41/0xe0 [ 58.198765][ C1] ip_protocol_deliver_rcu+0x4d/0x420 [ 58.204420][ C1] ip_local_deliver_finish+0x110/0x140 [ 58.209875][ C1] ip_local_deliver+0x133/0x210 [ 58.214711][ C1] ? ip_protocol_deliver_rcu+0x420/0x420 [ 58.220341][ C1] ip_rcv_finish+0x121/0x160 [ 58.224914][ C1] ip_rcv+0x18f/0x1a0 [ 58.229024][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 58.233881][ C1] ? ip_local_deliver+0x210/0x210 [ 58.238896][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 58.244640][ C1] __netif_receive_skb+0x37/0xf0 [ 58.249575][ C1] netif_receive_skb_internal+0x59/0x190 [ 58.255221][ C1] napi_gro_receive+0x28f/0x330 [ 58.260069][ C1] receive_buf+0x284/0x30b0 [ 58.264662][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 58.270356][ C1] ? virtqueue_get_buf+0x31/0x40 [ 58.275393][ C1] virtnet_poll+0x436/0x7d0 [ 58.279995][ C1] net_rx_action+0x3ae/0xa90 [ 58.284590][ C1] __do_softirq+0x115/0x33f [ 58.289104][ C1] ? takeover_tasklets+0x250/0x250 [ 58.294233][ C1] run_ksoftirqd+0x46/0x60 [ 58.298673][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 58.303603][ C1] kthread+0x1d4/0x200 [ 58.307954][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 58.313924][ C1] ? kthread_stop+0x2d0/0x2d0 [ 58.318600][ C1] ret_from_fork+0x1f/0x30 [ 58.324677][ C1] Kernel Offset: disabled [ 58.329031][ C1] Rebooting in 86400 seconds..