[ 36.033545][ T26] audit: type=1800 audit(1570191277.505:25): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.053447][ T26] audit: type=1800 audit(1570191277.505:26): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.075074][ T26] audit: type=1800 audit(1570191277.505:27): pid=7030 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. [ 36.434384][ T7093] sshd (7093) 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 '10.128.0.202' (ECDSA) to the list of known hosts. 2019/10/04 12:14:44 fuzzer started 2019/10/04 12:14:46 dialing manager at 10.128.0.105:38119 2019/10/04 12:14:46 syscalls: 2523 2019/10/04 12:14:46 code coverage: enabled 2019/10/04 12:14:46 comparison tracing: enabled 2019/10/04 12:14:46 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:14:46 setuid sandbox: enabled 2019/10/04 12:14:46 namespace sandbox: enabled 2019/10/04 12:14:46 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:14:46 fault injection: enabled 2019/10/04 12:14:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:14:46 net packet injection: enabled 2019/10/04 12:14:46 net device setup: enabled 2019/10/04 12:14:46 concurrency sanitizer: enabled syzkaller login: [ 44.808891][ T7184] ================================================================== [ 44.817144][ T7184] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480 [ 44.827273][ T7184] [ 44.829624][ T7184] write to 0xffff888126b2a9ec of 4 bytes by interrupt on cpu 1: [ 44.837234][ T7184] tcp_add_backlog+0x4a0/0xcc0 [ 44.841974][ T7184] tcp_v4_rcv+0x1aba/0x1bf0 [ 44.846459][ T7184] ip_protocol_deliver_rcu+0x51/0x470 [ 44.851808][ T7184] ip_local_deliver_finish+0x110/0x140 [ 44.857239][ T7184] ip_local_deliver+0x133/0x210 [ 44.862079][ T7184] ip_rcv_finish+0x121/0x160 [ 44.866643][ T7184] ip_rcv+0x18f/0x1a0 [ 44.870603][ T7184] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.876299][ T7184] __netif_receive_skb+0x37/0xf0 [ 44.881259][ T7184] netif_receive_skb_internal+0x59/0x190 [ 44.886865][ T7184] napi_gro_receive+0x28f/0x330 [ 44.891706][ T7184] receive_buf+0x284/0x30b0 [ 44.896192][ T7184] virtnet_poll+0x436/0x7d0 [ 44.900678][ T7184] net_rx_action+0x3ae/0xa50 [ 44.905249][ T7184] [ 44.907560][ T7184] read to 0xffff888126b2a9ec of 4 bytes by task 7184 on cpu 0: [ 44.915088][ T7184] tcp_grow_window.isra.0+0x6b/0x480 [ 44.920351][ T7184] tcp_event_data_recv+0x68f/0x990 [ 44.925441][ T7184] tcp_rcv_established+0xbfe/0xf50 [ 44.930564][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 44.935134][ T7184] __release_sock+0x135/0x1e0 [ 44.939788][ T7184] release_sock+0x61/0x160 [ 44.944210][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 44.948704][ T7184] inet_recvmsg+0xbb/0x250 [ 44.953109][ T7184] sock_recvmsg+0x92/0xb0 [ 44.957430][ T7184] sock_read_iter+0x15f/0x1e0 [ 44.962084][ T7184] new_sync_read+0x389/0x4f0 [ 44.966661][ T7184] __vfs_read+0xb1/0xc0 [ 44.970793][ T7184] vfs_read+0x143/0x2c0 [ 44.974929][ T7184] [ 44.977241][ T7184] Reported by Kernel Concurrency Sanitizer on: [ 44.983369][ T7184] CPU: 0 PID: 7184 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.990448][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.000485][ T7184] ================================================================== [ 45.008519][ T7184] Kernel panic - not syncing: panic_on_warn set ... [ 45.015080][ T7184] CPU: 0 PID: 7184 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.022172][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.032199][ T7184] Call Trace: [ 45.035471][ T7184] dump_stack+0xf5/0x159 [ 45.039706][ T7184] panic+0x209/0x639 [ 45.043582][ T7184] ? vprintk_func+0x8d/0x140 [ 45.048151][ T7184] kcsan_report.cold+0x57/0xeb [ 45.052895][ T7184] __kcsan_setup_watchpoint+0x342/0x500 [ 45.058419][ T7184] __tsan_read4+0x2c/0x30 [ 45.062741][ T7184] tcp_grow_window.isra.0+0x6b/0x480 [ 45.068006][ T7184] tcp_event_data_recv+0x68f/0x990 [ 45.073098][ T7184] tcp_rcv_established+0xbfe/0xf50 [ 45.078189][ T7184] ? ipv4_dst_check+0xc6/0xf0 [ 45.082860][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 45.087429][ T7184] __release_sock+0x135/0x1e0 [ 45.092085][ T7184] release_sock+0x61/0x160 [ 45.096482][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 45.100988][ T7184] inet_recvmsg+0xbb/0x250 [ 45.105381][ T7184] ? __tsan_read8+0x2c/0x30 [ 45.109874][ T7184] ? inet_sendpage+0x100/0x100 [ 45.114614][ T7184] sock_recvmsg+0x92/0xb0 [ 45.118921][ T7184] sock_read_iter+0x15f/0x1e0 [ 45.123581][ T7184] new_sync_read+0x389/0x4f0 [ 45.128160][ T7184] __vfs_read+0xb1/0xc0 [ 45.132295][ T7184] vfs_read+0x143/0x2c0 [ 45.136443][ T7184] ksys_read+0xd5/0x1b0 [ 45.140578][ T7184] __x64_sys_read+0x4c/0x60 [ 45.145072][ T7184] do_syscall_64+0xcf/0x2f0 [ 45.149557][ T7184] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.155427][ T7184] RIP: 0033:0x47c530 [ 45.159302][ T7184] 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 [ 45.178888][ T7184] RSP: 002b:000000c4204e37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 45.187287][ T7184] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.195236][ T7184] RDX: 0000000000001000 RSI: 000000c4200a2000 RDI: 0000000000000003 [ 45.203185][ T7184] RBP: 000000c4204e3830 R08: 0000000000000000 R09: 0000000000000000 [ 45.211133][ T7184] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 45.219079][ T7184] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 45.228422][ T7184] Kernel Offset: disabled [ 45.232747][ T7184] Rebooting in 86400 seconds..