[info] Using makefile-style concurrent boot in runlevel 2. [ 41.527038][ T25] audit: type=1800 audit(1575542564.181:21): pid=7384 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.574960][ T25] audit: type=1800 audit(1575542564.181:22): pid=7384 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 '10.128.0.80' (ECDSA) to the list of known hosts. 2019/12/05 10:42:55 fuzzer started 2019/12/05 10:42:57 dialing manager at 10.128.0.105:33795 2019/12/05 10:42:57 syscalls: 2684 2019/12/05 10:42:57 code coverage: enabled 2019/12/05 10:42:57 comparison tracing: enabled 2019/12/05 10:42:57 extra coverage: extra coverage is not supported by the kernel 2019/12/05 10:42:57 setuid sandbox: enabled 2019/12/05 10:42:57 namespace sandbox: enabled 2019/12/05 10:42:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/05 10:42:57 fault injection: enabled 2019/12/05 10:42:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/05 10:42:57 net packet injection: enabled 2019/12/05 10:42:57 net device setup: enabled 2019/12/05 10:42:57 concurrency sanitizer: enabled 2019/12/05 10:42:57 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/05 10:42:58 adding functions to KCSAN blacklist: 'tick_do_update_jiffies64' 'blk_mq_sched_dispatch_requests' 'find_next_bit' '__snd_rawmidi_transmit_ack' '__hrtimer_run_queues' 'tomoyo_supervisor' 'pipe_poll' syzkaller login: [ 55.820513][ T7539] ================================================================== [ 55.828673][ T7539] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 55.835716][ T7539] [ 55.838026][ T7539] write to 0xffff88812416c138 of 8 bytes by interrupt on cpu 1: [ 55.845641][ T7539] tcp_add_backlog+0x476/0xce0 [ 55.850386][ T7539] tcp_v4_rcv+0x1a70/0x1bd0 [ 55.854894][ T7539] ip_protocol_deliver_rcu+0x4d/0x420 [ 55.860264][ T7539] ip_local_deliver_finish+0x110/0x140 [ 55.865712][ T7539] ip_local_deliver+0x133/0x210 [ 55.870545][ T7539] ip_rcv_finish+0x121/0x160 [ 55.875130][ T7539] ip_rcv+0x18f/0x1a0 [ 55.879100][ T7539] __netif_receive_skb_one_core+0xa7/0xe0 [ 55.884796][ T7539] __netif_receive_skb+0x37/0xf0 [ 55.889709][ T7539] netif_receive_skb_internal+0x59/0x190 [ 55.895403][ T7539] napi_gro_receive+0x28f/0x330 [ 55.900250][ T7539] receive_buf+0x284/0x30b0 [ 55.904731][ T7539] virtnet_poll+0x436/0x7d0 [ 55.909211][ T7539] net_rx_action+0x3ae/0xa90 [ 55.913804][ T7539] __do_softirq+0x115/0x33f [ 55.918287][ T7539] run_ksoftirqd+0x46/0x60 [ 55.922679][ T7539] smpboot_thread_fn+0x37d/0x4a0 [ 55.927603][ T7539] kthread+0x1d4/0x200 [ 55.932010][ T7539] ret_from_fork+0x1f/0x30 [ 55.936407][ T7539] [ 55.938737][ T7539] read to 0xffff88812416c138 of 8 bytes by task 7539 on cpu 0: [ 55.946274][ T7539] tcp_recvmsg+0x46e/0x1b40 [ 55.950765][ T7539] inet_recvmsg+0xbb/0x250 [ 55.955167][ T7539] sock_recvmsg+0x92/0xb0 [ 55.959620][ T7539] sock_read_iter+0x15f/0x1e0 [ 55.964284][ T7539] new_sync_read+0x389/0x4f0 [ 55.968858][ T7539] __vfs_read+0xb1/0xc0 [ 55.972999][ T7539] vfs_read+0x143/0x2c0 [ 55.977136][ T7539] ksys_read+0xd5/0x1b0 [ 55.981284][ T7539] __x64_sys_read+0x4c/0x60 [ 55.985789][ T7539] do_syscall_64+0xcc/0x370 [ 55.990285][ T7539] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.996407][ T7539] [ 55.998711][ T7539] Reported by Kernel Concurrency Sanitizer on: [ 56.004849][ T7539] CPU: 0 PID: 7539 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 56.012712][ T7539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.022742][ T7539] ================================================================== [ 56.030781][ T7539] Kernel panic - not syncing: panic_on_warn set ... [ 56.037350][ T7539] CPU: 0 PID: 7539 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 56.045213][ T7539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.055245][ T7539] Call Trace: [ 56.058523][ T7539] dump_stack+0x11d/0x181 [ 56.062851][ T7539] panic+0x210/0x640 [ 56.066729][ T7539] ? vprintk_func+0x8d/0x140 [ 56.071304][ T7539] kcsan_report.cold+0xc/0xd [ 56.075878][ T7539] kcsan_setup_watchpoint+0x3fe/0x460 [ 56.081234][ T7539] __tsan_read8+0xc6/0x100 [ 56.085632][ T7539] tcp_recvmsg+0x46e/0x1b40 [ 56.090142][ T7539] inet_recvmsg+0xbb/0x250 [ 56.094563][ T7539] ? apparmor_socket_recvmsg+0x3b/0x50 [ 56.100004][ T7539] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.106227][ T7539] ? security_socket_recvmsg+0x92/0xb0 [ 56.111683][ T7539] ? inet_sendpage+0x100/0x100 [ 56.116526][ T7539] sock_recvmsg+0x92/0xb0 [ 56.120848][ T7539] sock_read_iter+0x15f/0x1e0 [ 56.125524][ T7539] new_sync_read+0x389/0x4f0 [ 56.130110][ T7539] __vfs_read+0xb1/0xc0 [ 56.134242][ T7539] vfs_read+0x143/0x2c0 [ 56.138378][ T7539] ksys_read+0xd5/0x1b0 [ 56.142515][ T7539] __x64_sys_read+0x4c/0x60 [ 56.147014][ T7539] do_syscall_64+0xcc/0x370 [ 56.151597][ T7539] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.157466][ T7539] RIP: 0033:0x47c530 [ 56.161348][ T7539] 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 [ 56.180933][ T7539] RSP: 002b:000000c4202ed810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 56.189378][ T7539] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.197384][ T7539] RDX: 0000000000001000 RSI: 000000c420052000 RDI: 0000000000000003 [ 56.205354][ T7539] RBP: 000000c4202ed868 R08: 0000000000000000 R09: 0000000000000000 [ 56.213315][ T7539] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 56.221278][ T7539] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 56.230761][ T7539] Kernel Offset: disabled [ 56.235190][ T7539] Rebooting in 86400 seconds..