[info] Using makefile-style concurrent boot in runlevel 2. [ 40.304857][ T26] audit: type=1800 audit(1575590803.205:21): pid=7339 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 40.344714][ T26] audit: type=1800 audit(1575590803.205:22): pid=7339 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 '10.128.0.102' (ECDSA) to the list of known hosts. 2019/12/06 00:06:51 fuzzer started 2019/12/06 00:06:53 dialing manager at 10.128.0.105:45173 2019/12/06 00:06:53 syscalls: 2684 2019/12/06 00:06:53 code coverage: enabled 2019/12/06 00:06:53 comparison tracing: enabled 2019/12/06 00:06:53 extra coverage: extra coverage is not supported by the kernel 2019/12/06 00:06:53 setuid sandbox: enabled 2019/12/06 00:06:53 namespace sandbox: enabled 2019/12/06 00:06:53 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/06 00:06:53 fault injection: enabled 2019/12/06 00:06:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/06 00:06:53 net packet injection: enabled 2019/12/06 00:06:53 net device setup: enabled 2019/12/06 00:06:53 concurrency sanitizer: enabled 2019/12/06 00:06:53 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/06 00:06:53 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'mod_timer' 'generic_fillattr' 'find_next_bit' 'ext4_has_free_clusters' syzkaller login: [ 51.225258][ T7493] ================================================================== [ 51.233389][ T7493] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 51.240396][ T7493] [ 51.242743][ T7493] write to 0xffff888126bf1338 of 8 bytes by interrupt on cpu 1: [ 51.250356][ T7493] tcp_add_backlog+0x476/0xce0 [ 51.255100][ T7493] tcp_v4_rcv+0x1a70/0x1bd0 [ 51.259609][ T7493] ip_protocol_deliver_rcu+0x4d/0x420 [ 51.264975][ T7493] ip_local_deliver_finish+0x110/0x140 [ 51.270420][ T7493] ip_local_deliver+0x133/0x210 [ 51.275252][ T7493] ip_rcv_finish+0x121/0x160 [ 51.279823][ T7493] ip_rcv+0x18f/0x1a0 [ 51.283788][ T7493] __netif_receive_skb_one_core+0xa7/0xe0 [ 51.289497][ T7493] __netif_receive_skb+0x37/0xf0 [ 51.294419][ T7493] netif_receive_skb_internal+0x59/0x190 [ 51.300031][ T7493] napi_gro_receive+0x28f/0x330 [ 51.304870][ T7493] receive_buf+0x284/0x30b0 [ 51.309355][ T7493] virtnet_poll+0x436/0x7d0 [ 51.313837][ T7493] net_rx_action+0x3ae/0xa90 [ 51.318420][ T7493] __do_softirq+0x115/0x33f [ 51.323018][ T7493] run_ksoftirqd+0x46/0x60 [ 51.327442][ T7493] smpboot_thread_fn+0x37d/0x4a0 [ 51.332362][ T7493] kthread+0x1d4/0x200 [ 51.336415][ T7493] ret_from_fork+0x1f/0x30 [ 51.340804][ T7493] [ 51.343118][ T7493] read to 0xffff888126bf1338 of 8 bytes by task 7493 on cpu 0: [ 51.350645][ T7493] tcp_recvmsg+0x46e/0x1b40 [ 51.355156][ T7493] inet_recvmsg+0xbb/0x250 [ 51.359555][ T7493] sock_recvmsg+0x92/0xb0 [ 51.363860][ T7493] sock_read_iter+0x15f/0x1e0 [ 51.368517][ T7493] new_sync_read+0x389/0x4f0 [ 51.373083][ T7493] __vfs_read+0xb1/0xc0 [ 51.377214][ T7493] vfs_read+0x143/0x2c0 [ 51.381353][ T7493] ksys_read+0xd5/0x1b0 [ 51.385487][ T7493] __x64_sys_read+0x4c/0x60 [ 51.389969][ T7493] do_syscall_64+0xcc/0x370 [ 51.394451][ T7493] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.400313][ T7493] [ 51.402621][ T7493] Reported by Kernel Concurrency Sanitizer on: [ 51.408760][ T7493] CPU: 0 PID: 7493 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 51.416622][ T7493] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.426655][ T7493] ================================================================== [ 51.434691][ T7493] Kernel panic - not syncing: panic_on_warn set ... [ 51.441258][ T7493] CPU: 0 PID: 7493 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 51.449132][ T7493] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.459169][ T7493] Call Trace: [ 51.462482][ T7493] dump_stack+0x11d/0x181 [ 51.466801][ T7493] panic+0x210/0x640 [ 51.470691][ T7493] ? vprintk_func+0x8d/0x140 [ 51.475265][ T7493] kcsan_report.cold+0xc/0xd [ 51.479854][ T7493] kcsan_setup_watchpoint+0x3fe/0x460 [ 51.485211][ T7493] __tsan_read8+0xc6/0x100 [ 51.489613][ T7493] tcp_recvmsg+0x46e/0x1b40 [ 51.494143][ T7493] inet_recvmsg+0xbb/0x250 [ 51.498545][ T7493] ? apparmor_socket_recvmsg+0x3b/0x50 [ 51.503986][ T7493] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.510207][ T7493] ? security_socket_recvmsg+0x92/0xb0 [ 51.515648][ T7493] ? inet_sendpage+0x100/0x100 [ 51.520393][ T7493] sock_recvmsg+0x92/0xb0 [ 51.524705][ T7493] sock_read_iter+0x15f/0x1e0 [ 51.529367][ T7493] new_sync_read+0x389/0x4f0 [ 51.533938][ T7493] __vfs_read+0xb1/0xc0 [ 51.538073][ T7493] vfs_read+0x143/0x2c0 [ 51.542208][ T7493] ksys_read+0xd5/0x1b0 [ 51.546344][ T7493] __x64_sys_read+0x4c/0x60 [ 51.550830][ T7493] do_syscall_64+0xcc/0x370 [ 51.555316][ T7493] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.561184][ T7493] RIP: 0033:0x47c530 [ 51.565059][ T7493] 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 [ 51.584654][ T7493] RSP: 002b:000000c4201817d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 51.593043][ T7493] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 51.600995][ T7493] RDX: 0000000000001000 RSI: 000000c420310000 RDI: 0000000000000003 [ 51.608964][ T7493] RBP: 000000c420181830 R08: 0000000000000000 R09: 0000000000000000 [ 51.616912][ T7493] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 51.624863][ T7493] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 51.634244][ T7493] Kernel Offset: disabled [ 51.638568][ T7493] Rebooting in 86400 seconds..