[ 36.169076][ T26] audit: type=1800 audit(1570920259.431:25): pid=7137 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.188846][ T26] audit: type=1800 audit(1570920259.431:26): pid=7137 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.208773][ T26] audit: type=1800 audit(1570920259.431:27): pid=7137 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. [ 36.633055][ T7202] sshd (7202) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. 2019/10/12 22:44:31 fuzzer started 2019/10/12 22:44:32 dialing manager at 10.128.0.105:43913 2019/10/12 22:44:32 syscalls: 2523 2019/10/12 22:44:32 code coverage: enabled 2019/10/12 22:44:32 comparison tracing: enabled 2019/10/12 22:44:32 extra coverage: extra coverage is not supported by the kernel 2019/10/12 22:44:32 setuid sandbox: enabled 2019/10/12 22:44:32 namespace sandbox: enabled 2019/10/12 22:44:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 22:44:32 fault injection: enabled 2019/10/12 22:44:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 22:44:32 net packet injection: enabled 2019/10/12 22:44:32 net device setup: enabled 2019/10/12 22:44:32 concurrency sanitizer: enabled syzkaller login: [ 49.120000][ T7296] ================================================================== [ 49.128551][ T7296] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 49.136564][ T7296] [ 49.138877][ T7296] read to 0xffff8881249df30c of 4 bytes by interrupt on cpu 1: [ 49.146515][ T7296] tcp_add_backlog+0x43/0xcc0 [ 49.151181][ T7296] tcp_v4_rcv+0x1aba/0x1bf0 [ 49.155673][ T7296] ip_protocol_deliver_rcu+0x51/0x470 [ 49.161042][ T7296] ip_local_deliver_finish+0x110/0x140 [ 49.166485][ T7296] ip_local_deliver+0x133/0x210 [ 49.171576][ T7296] ip_rcv_finish+0x121/0x160 [ 49.176340][ T7296] ip_rcv+0x18f/0x1a0 [ 49.180308][ T7296] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.186018][ T7296] __netif_receive_skb+0x37/0xf0 [ 49.190935][ T7296] netif_receive_skb_internal+0x59/0x190 [ 49.196544][ T7296] napi_gro_receive+0x28f/0x330 [ 49.201463][ T7296] receive_buf+0x284/0x30b0 [ 49.205943][ T7296] virtnet_poll+0x436/0x7d0 [ 49.210423][ T7296] net_rx_action+0x3ae/0xa50 [ 49.214985][ T7296] [ 49.217293][ T7296] write to 0xffff8881249df30c of 4 bytes by task 7296 on cpu 0: [ 49.224900][ T7296] tcp_rcv_space_adjust+0x40f/0x4c0 [ 49.230080][ T7296] tcp_recvmsg+0xdaa/0x1a30 [ 49.234559][ T7296] inet_recvmsg+0xbb/0x250 [ 49.238960][ T7296] sock_recvmsg+0x92/0xb0 [ 49.243482][ T7296] sock_read_iter+0x15f/0x1e0 [ 49.248573][ T7296] new_sync_read+0x389/0x4f0 [ 49.253168][ T7296] __vfs_read+0xb1/0xc0 [ 49.257349][ T7296] vfs_read+0x143/0x2c0 [ 49.261501][ T7296] ksys_read+0xd5/0x1b0 [ 49.265742][ T7296] __x64_sys_read+0x4c/0x60 [ 49.270410][ T7296] do_syscall_64+0xcf/0x2f0 [ 49.274993][ T7296] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.280863][ T7296] [ 49.284059][ T7296] Reported by Kernel Concurrency Sanitizer on: [ 49.290395][ T7296] CPU: 0 PID: 7296 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.298213][ T7296] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.308430][ T7296] ================================================================== [ 49.316733][ T7296] Kernel panic - not syncing: panic_on_warn set ... [ 49.323305][ T7296] CPU: 0 PID: 7296 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.330389][ T7296] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.340695][ T7296] Call Trace: [ 49.344146][ T7296] dump_stack+0xf5/0x159 [ 49.348388][ T7296] panic+0x209/0x639 [ 49.352277][ T7296] ? ksys_read+0xd5/0x1b0 [ 49.356625][ T7296] ? vprintk_func+0x8d/0x140 [ 49.361404][ T7296] kcsan_report.cold+0xc/0x1b [ 49.366089][ T7296] __kcsan_setup_watchpoint+0x3ee/0x510 [ 49.371663][ T7296] __tsan_write4+0x32/0x40 [ 49.376067][ T7296] tcp_rcv_space_adjust+0x40f/0x4c0 [ 49.381450][ T7296] tcp_recvmsg+0xdaa/0x1a30 [ 49.386217][ T7296] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.392093][ T7296] inet_recvmsg+0xbb/0x250 [ 49.397187][ T7296] ? __tsan_read8+0x2c/0x30 [ 49.402311][ T7296] ? inet_sendpage+0x100/0x100 [ 49.407204][ T7296] sock_recvmsg+0x92/0xb0 [ 49.411634][ T7296] sock_read_iter+0x15f/0x1e0 [ 49.416311][ T7296] new_sync_read+0x389/0x4f0 [ 49.420891][ T7296] __vfs_read+0xb1/0xc0 [ 49.425297][ T7296] vfs_read+0x143/0x2c0 [ 49.429439][ T7296] ksys_read+0xd5/0x1b0 [ 49.433589][ T7296] __x64_sys_read+0x4c/0x60 [ 49.438078][ T7296] do_syscall_64+0xcf/0x2f0 [ 49.442589][ T7296] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.448459][ T7296] RIP: 0033:0x47c530 [ 49.452334][ T7296] 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 [ 49.473055][ T7296] RSP: 002b:000000c4204f37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 49.481542][ T7296] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.489592][ T7296] RDX: 0000000000001000 RSI: 000000c42037a000 RDI: 0000000000000003 [ 49.497553][ T7296] RBP: 000000c4204f3830 R08: 0000000000000000 R09: 0000000000000000 [ 49.505503][ T7296] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020 [ 49.513451][ T7296] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.522680][ T7296] Kernel Offset: disabled [ 49.527000][ T7296] Rebooting in 86400 seconds..