[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.770253][ T25] audit: type=1800 audit(1570191089.920:25): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.791043][ T25] audit: type=1800 audit(1570191089.920:26): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.811002][ T25] audit: type=1800 audit(1570191089.920:27): pid=7107 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 '10.128.0.3' (ECDSA) to the list of known hosts. 2019/10/04 12:11:37 fuzzer started 2019/10/04 12:11:38 dialing manager at 10.128.0.105:38119 2019/10/04 12:11:38 syscalls: 2523 2019/10/04 12:11:38 code coverage: enabled 2019/10/04 12:11:38 comparison tracing: enabled 2019/10/04 12:11:38 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:11:38 setuid sandbox: enabled 2019/10/04 12:11:38 namespace sandbox: enabled 2019/10/04 12:11:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:11:38 fault injection: enabled 2019/10/04 12:11:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:11:38 net packet injection: enabled 2019/10/04 12:11:38 net device setup: enabled 2019/10/04 12:11:38 concurrency sanitizer: enabled syzkaller login: [ 44.839026][ T7260] ================================================================== [ 44.847342][ T7260] BUG: KCSAN: data-race in tcp_add_backlog+0x45a/0xcc0 and tcp_recvmsg+0x470/0x1a30 [ 44.856856][ T7260] [ 44.859207][ T7260] write to 0xffff8881224b32f8 of 8 bytes by interrupt on cpu 0: [ 44.866829][ T7260] tcp_add_backlog+0x45a/0xcc0 [ 44.871591][ T7260] tcp_v4_rcv+0x1aba/0x1bf0 [ 44.876074][ T7260] ip_protocol_deliver_rcu+0x51/0x470 [ 44.881424][ T7260] ip_local_deliver_finish+0x110/0x140 [ 44.886886][ T7260] ip_local_deliver+0x133/0x210 [ 44.891720][ T7260] ip_rcv_finish+0x121/0x160 [ 44.896322][ T7260] ip_rcv+0x18f/0x1a0 [ 44.900322][ T7260] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.906028][ T7260] __netif_receive_skb+0x37/0xf0 [ 44.910950][ T7260] netif_receive_skb_internal+0x59/0x190 [ 44.916567][ T7260] napi_gro_receive+0x28f/0x330 [ 44.921406][ T7260] receive_buf+0x284/0x30b0 [ 44.925890][ T7260] virtnet_poll+0x436/0x7d0 [ 44.930472][ T7260] net_rx_action+0x3ae/0xa50 [ 44.935044][ T7260] [ 44.937354][ T7260] read to 0xffff8881224b32f8 of 8 bytes by task 7260 on cpu 1: [ 44.944883][ T7260] tcp_recvmsg+0x470/0x1a30 [ 44.949387][ T7260] inet_recvmsg+0xbb/0x250 [ 44.953780][ T7260] sock_recvmsg+0x92/0xb0 [ 44.958279][ T7260] sock_read_iter+0x15f/0x1e0 [ 44.962936][ T7260] new_sync_read+0x389/0x4f0 [ 44.967514][ T7260] __vfs_read+0xb1/0xc0 [ 44.971657][ T7260] vfs_read+0x143/0x2c0 [ 44.975801][ T7260] ksys_read+0xd5/0x1b0 [ 44.980651][ T7260] __x64_sys_read+0x4c/0x60 [ 44.985142][ T7260] do_syscall_64+0xcf/0x2f0 [ 44.989639][ T7260] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.995851][ T7260] [ 44.998179][ T7260] Reported by Kernel Concurrency Sanitizer on: [ 45.004414][ T7260] CPU: 1 PID: 7260 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.012831][ T7260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.023055][ T7260] ================================================================== [ 45.031895][ T7260] Kernel panic - not syncing: panic_on_warn set ... [ 45.038573][ T7260] CPU: 1 PID: 7260 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.045752][ T7260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.056826][ T7260] Call Trace: [ 45.060119][ T7260] dump_stack+0xf5/0x159 [ 45.064355][ T7260] panic+0x209/0x639 [ 45.068239][ T7260] ? vprintk_func+0x8d/0x140 [ 45.072821][ T7260] kcsan_report.cold+0x57/0xeb [ 45.077569][ T7260] __kcsan_setup_watchpoint+0x342/0x500 [ 45.083094][ T7260] __tsan_read8+0x2c/0x30 [ 45.087407][ T7260] tcp_recvmsg+0x470/0x1a30 [ 45.091901][ T7260] inet_recvmsg+0xbb/0x250 [ 45.096417][ T7260] ? __tsan_read8+0x2c/0x30 [ 45.101007][ T7260] ? inet_sendpage+0x100/0x100 [ 45.105758][ T7260] sock_recvmsg+0x92/0xb0 [ 45.110066][ T7260] sock_read_iter+0x15f/0x1e0 [ 45.114727][ T7260] new_sync_read+0x389/0x4f0 [ 45.119304][ T7260] __vfs_read+0xb1/0xc0 [ 45.123442][ T7260] vfs_read+0x143/0x2c0 [ 45.127593][ T7260] ksys_read+0xd5/0x1b0 [ 45.131836][ T7260] __x64_sys_read+0x4c/0x60 [ 45.136322][ T7260] do_syscall_64+0xcf/0x2f0 [ 45.140812][ T7260] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.146683][ T7260] RIP: 0033:0x47c530 [ 45.150568][ T7260] 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 [ 45.170446][ T7260] RSP: 002b:000000c4200517d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 45.178883][ T7260] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.186851][ T7260] RDX: 0000000000001000 RSI: 000000c420136000 RDI: 0000000000000003 [ 45.194815][ T7260] RBP: 000000c420051830 R08: 0000000000000000 R09: 0000000000000000 [ 45.202767][ T7260] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 45.210815][ T7260] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 45.220554][ T7260] Kernel Offset: disabled [ 45.224878][ T7260] Rebooting in 86400 seconds..