[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.062851][ T26] audit: type=1800 audit(1571748670.153:25): pid=7001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.082530][ T26] audit: type=1800 audit(1571748670.153:26): pid=7001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.104509][ T26] audit: type=1800 audit(1571748670.153:27): pid=7001 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 '10.128.0.110' (ECDSA) to the list of known hosts. 2019/10/22 12:51:21 fuzzer started 2019/10/22 12:51:22 dialing manager at 10.128.0.105:37053 2019/10/22 12:51:22 syscalls: 2524 2019/10/22 12:51:22 code coverage: enabled 2019/10/22 12:51:22 comparison tracing: enabled 2019/10/22 12:51:22 extra coverage: extra coverage is not supported by the kernel 2019/10/22 12:51:22 setuid sandbox: enabled 2019/10/22 12:51:22 namespace sandbox: enabled 2019/10/22 12:51:22 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 12:51:22 fault injection: enabled 2019/10/22 12:51:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 12:51:22 net packet injection: enabled 2019/10/22 12:51:22 net device setup: enabled 2019/10/22 12:51:22 concurrency sanitizer: enabled syzkaller login: [ 48.909102][ T7158] ================================================================== [ 48.917239][ T7158] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 48.924244][ T7158] [ 48.926596][ T7158] write to 0xffff888122048138 of 8 bytes by interrupt on cpu 1: [ 48.934203][ T7158] tcp_add_backlog+0x45a/0xcc0 [ 48.938946][ T7158] tcp_v4_rcv+0x1a60/0x1bb0 [ 48.943449][ T7158] ip_protocol_deliver_rcu+0x4d/0x420 [ 48.948855][ T7158] ip_local_deliver_finish+0x110/0x140 [ 48.954908][ T7158] ip_local_deliver+0x133/0x210 [ 48.959735][ T7158] ip_rcv_finish+0x121/0x160 [ 48.964330][ T7158] ip_rcv+0x18f/0x1a0 [ 48.968327][ T7158] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.974025][ T7158] __netif_receive_skb+0x37/0xf0 [ 48.978960][ T7158] netif_receive_skb_internal+0x59/0x190 [ 48.984568][ T7158] napi_gro_receive+0x28f/0x330 [ 48.989416][ T7158] receive_buf+0x284/0x30b0 [ 48.993914][ T7158] virtnet_poll+0x436/0x7d0 [ 48.998395][ T7158] net_rx_action+0x3ae/0xa90 [ 49.002956][ T7158] [ 49.005277][ T7158] read to 0xffff888122048138 of 8 bytes by task 7158 on cpu 0: [ 49.012800][ T7158] tcp_recvmsg+0x470/0x1a30 [ 49.017278][ T7158] inet_recvmsg+0xbb/0x250 [ 49.021674][ T7158] sock_recvmsg+0x92/0xb0 [ 49.025988][ T7158] sock_read_iter+0x15f/0x1e0 [ 49.030739][ T7158] new_sync_read+0x389/0x4f0 [ 49.035315][ T7158] __vfs_read+0xb1/0xc0 [ 49.039476][ T7158] vfs_read+0x143/0x2c0 [ 49.043613][ T7158] ksys_read+0xd5/0x1b0 [ 49.047745][ T7158] __x64_sys_read+0x4c/0x60 [ 49.052228][ T7158] do_syscall_64+0xcc/0x370 [ 49.056720][ T7158] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.062582][ T7158] [ 49.064884][ T7158] Reported by Kernel Concurrency Sanitizer on: [ 49.071016][ T7158] CPU: 0 PID: 7158 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.078442][ T7158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.088483][ T7158] ================================================================== [ 49.096525][ T7158] Kernel panic - not syncing: panic_on_warn set ... [ 49.103143][ T7158] CPU: 0 PID: 7158 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.110683][ T7158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.120715][ T7158] Call Trace: [ 49.124075][ T7158] dump_stack+0xf5/0x159 [ 49.128333][ T7158] panic+0x210/0x640 [ 49.132233][ T7158] ? __x64_sys_read+0x4c/0x60 [ 49.136887][ T7158] ? vprintk_func+0x8d/0x140 [ 49.141462][ T7158] kcsan_report.cold+0xc/0x10 [ 49.146120][ T7158] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.151654][ T7158] __tsan_read8+0x2c/0x30 [ 49.155966][ T7158] tcp_recvmsg+0x470/0x1a30 [ 49.160724][ T7158] inet_recvmsg+0xbb/0x250 [ 49.165116][ T7158] ? __tsan_read8+0x2c/0x30 [ 49.169598][ T7158] ? inet_sendpage+0x100/0x100 [ 49.174600][ T7158] sock_recvmsg+0x92/0xb0 [ 49.178920][ T7158] sock_read_iter+0x15f/0x1e0 [ 49.183580][ T7158] new_sync_read+0x389/0x4f0 [ 49.188151][ T7158] __vfs_read+0xb1/0xc0 [ 49.192294][ T7158] vfs_read+0x143/0x2c0 [ 49.196439][ T7158] ksys_read+0xd5/0x1b0 [ 49.200576][ T7158] __x64_sys_read+0x4c/0x60 [ 49.205057][ T7158] do_syscall_64+0xcc/0x370 [ 49.209540][ T7158] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.215409][ T7158] RIP: 0033:0x47c530 [ 49.219296][ T7158] 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 [ 49.238878][ T7158] RSP: 002b:000000c4204db810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 49.247275][ T7158] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.255271][ T7158] RDX: 0000000000001000 RSI: 000000c420358000 RDI: 0000000000000003 [ 49.263270][ T7158] RBP: 000000c4204db868 R08: 0000000000000000 R09: 0000000000000000 [ 49.271309][ T7158] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 49.279266][ T7158] R13: 000000c4200211a0 R14: 0000000000000002 R15: ffffffffffffffff [ 49.288525][ T7158] Kernel Offset: disabled [ 49.292857][ T7158] Rebooting in 86400 seconds..