[ 33.317480][ T26] audit: type=1800 audit(1571601317.555:21): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 33.364730][ T26] audit: type=1800 audit(1571601317.555:22): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 33.386204][ T26] audit: type=1800 audit(1571601317.555:23): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 33.407957][ T26] audit: type=1800 audit(1571601317.555:24): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.850872][ T26] audit: type=1800 audit(1571601318.095:25): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.890690][ T26] audit: type=1800 audit(1571601318.095:26): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.928182][ T26] audit: type=1800 audit(1571601318.095:27): pid=7041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] 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 '10.128.0.193' (ECDSA) to the list of known hosts. 2019/10/20 19:55:24 fuzzer started 2019/10/20 19:55:26 dialing manager at 10.128.0.105:43535 2019/10/20 19:55:26 syscalls: 2524 2019/10/20 19:55:26 code coverage: enabled 2019/10/20 19:55:26 comparison tracing: enabled 2019/10/20 19:55:26 extra coverage: extra coverage is not supported by the kernel 2019/10/20 19:55:26 setuid sandbox: enabled 2019/10/20 19:55:26 namespace sandbox: enabled 2019/10/20 19:55:26 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 19:55:26 fault injection: enabled 2019/10/20 19:55:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 19:55:26 net packet injection: enabled 2019/10/20 19:55:26 net device setup: enabled 2019/10/20 19:55:26 concurrency sanitizer: enabled syzkaller login: [ 41.955618][ C0] ================================================================== [ 41.966432][ C0] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 41.974405][ C0] [ 41.976724][ C0] write to 0xffff8881293c0a4c of 4 bytes by task 7197 on cpu 1: [ 41.984527][ C0] tcp_rcv_space_adjust+0x40f/0x4c0 [ 41.989884][ C0] tcp_recvmsg+0xdaa/0x1a30 [ 41.994647][ C0] inet_recvmsg+0xbb/0x250 [ 41.999138][ C0] sock_recvmsg+0x92/0xb0 [ 42.003544][ C0] sock_read_iter+0x15f/0x1e0 [ 42.008390][ C0] new_sync_read+0x389/0x4f0 [ 42.013237][ C0] __vfs_read+0xb1/0xc0 [ 42.017670][ C0] vfs_read+0x143/0x2c0 [ 42.021836][ C0] ksys_read+0xd5/0x1b0 [ 42.026065][ C0] __x64_sys_read+0x4c/0x60 [ 42.030558][ C0] do_syscall_64+0xcc/0x370 [ 42.035136][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.041011][ C0] [ 42.043603][ C0] read to 0xffff8881293c0a4c of 4 bytes by interrupt on cpu 0: [ 42.053044][ C0] tcp_add_backlog+0x43/0xcc0 [ 42.057804][ C0] tcp_v4_rcv+0x1a60/0x1bb0 [ 42.062304][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 42.067760][ C0] ip_local_deliver_finish+0x110/0x140 [ 42.073202][ C0] ip_local_deliver+0x133/0x210 [ 42.078159][ C0] ip_rcv_finish+0x121/0x160 [ 42.082999][ C0] ip_rcv+0x18f/0x1a0 [ 42.087080][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 42.093264][ C0] __netif_receive_skb+0x37/0xf0 [ 42.098199][ C0] netif_receive_skb_internal+0x59/0x190 [ 42.103933][ C0] napi_gro_receive+0x28f/0x330 [ 42.108768][ C0] receive_buf+0x284/0x30b0 [ 42.113430][ C0] virtnet_poll+0x436/0x7d0 [ 42.117923][ C0] [ 42.120238][ C0] Reported by Kernel Concurrency Sanitizer on: [ 42.126380][ C0] CPU: 0 PID: 7207 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.133904][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.144852][ C0] ================================================================== [ 42.153070][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 42.159648][ C0] CPU: 0 PID: 7207 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.167086][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.177215][ C0] Call Trace: [ 42.180572][ C0] [ 42.183433][ C0] dump_stack+0xf5/0x159 [ 42.187670][ C0] panic+0x210/0x640 [ 42.191553][ C0] ? __netif_receive_skb+0x37/0xf0 [ 42.196660][ C0] ? vprintk_func+0x8d/0x140 [ 42.201244][ C0] kcsan_report.cold+0xc/0x10 [ 42.206226][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 42.211941][ C0] __tsan_read4+0x2c/0x30 [ 42.216259][ C0] tcp_add_backlog+0x43/0xcc0 [ 42.220932][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.226637][ C0] ? sk_filter_trim_cap+0x202/0x510 [ 42.231831][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.237449][ C0] ? __tsan_write1+0x32/0x40 [ 42.242037][ C0] tcp_v4_rcv+0x1a60/0x1bb0 [ 42.246547][ C0] ? __tsan_read8+0x2c/0x30 [ 42.251043][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 42.256669][ C0] ip_local_deliver_finish+0x110/0x140 [ 42.262115][ C0] ip_local_deliver+0x133/0x210 [ 42.266961][ C0] ? ip_protocol_deliver_rcu+0x420/0x420 [ 42.272583][ C0] ip_rcv_finish+0x121/0x160 [ 42.277254][ C0] ip_rcv+0x18f/0x1a0 [ 42.281292][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 42.286137][ C0] ? ip_local_deliver+0x210/0x210 [ 42.291155][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 42.296864][ C0] __netif_receive_skb+0x37/0xf0 [ 42.301789][ C0] netif_receive_skb_internal+0x59/0x190 [ 42.307697][ C0] napi_gro_receive+0x28f/0x330 [ 42.312534][ C0] receive_buf+0x284/0x30b0 [ 42.317372][ C0] ? __tsan_write8+0x32/0x40 [ 42.322130][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 42.327583][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.333356][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 42.339072][ C0] virtnet_poll+0x436/0x7d0 [ 42.343842][ C0] net_rx_action+0x3ae/0xa90 [ 42.348520][ C0] __do_softirq+0x115/0x33f [ 42.353020][ C0] irq_exit+0xbb/0xe0 [ 42.357002][ C0] do_IRQ+0xa6/0x180 [ 42.361231][ C0] common_interrupt+0xf/0xf [ 42.365718][ C0] [ 42.368643][ C0] RIP: 0033:0x41d8c0 [ 42.372616][ C0] Code: 19 d2 45 21 d0 41 f6 c0 10 40 0f 95 c7 44 89 c9 e9 f3 fe ff ff 8b 0d 1b ef 41 01 85 c9 7e 09 48 8b 4b 30 49 39 c8 73 42 84 07 <41> 0f b6 0c 31 44 84 d1 75 2c f0 44 08 17 0f b6 4b 62 f6 c1 01 0f [ 42.392757][ C0] RSP: 002b:000000c420185e60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffda [ 42.401516][ C0] RAX: 000000c4200eb220 RBX: 00007f56c8be8990 RCX: 0000000000000000 [ 42.409473][ C0] RDX: 0000000000000000 RSI: 00007f56c8bc2968 RDI: 00007f56c8bc297a [ 42.417606][ C0] RBP: 000000c420185e80 R08: 0000000000000091 R09: 0000000000000012 [ 42.425742][ C0] R10: 0000000000000002 R11: 000000c4200eb220 R12: 000000c4204e2800 [ 42.434053][ C0] R13: 0000000000000051 R14: 0000000000000000 R15: 0000000000000000 [ 42.444029][ C0] Kernel Offset: disabled [ 42.448362][ C0] Rebooting in 86400 seconds..