[ 39.240388][ T25] audit: type=1800 audit(1570191806.682:24): pid=7189 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. [ 39.620190][ T25] audit: type=1800 audit(1570191807.142:25): pid=7189 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.647725][ T25] audit: type=1800 audit(1570191807.142:26): pid=7189 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.104' (ECDSA) to the list of known hosts. 2019/10/04 12:23:38 fuzzer started 2019/10/04 12:23:40 dialing manager at 10.128.0.105:38119 2019/10/04 12:23:40 syscalls: 2523 2019/10/04 12:23:40 code coverage: enabled 2019/10/04 12:23:40 comparison tracing: enabled 2019/10/04 12:23:40 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:23:40 setuid sandbox: enabled 2019/10/04 12:23:40 namespace sandbox: enabled 2019/10/04 12:23:40 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:23:40 fault injection: enabled 2019/10/04 12:23:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:23:40 net packet injection: enabled 2019/10/04 12:23:40 net device setup: enabled 2019/10/04 12:23:40 concurrency sanitizer: enabled syzkaller login: [ 53.199533][ T7359] ================================================================== [ 53.207748][ T7359] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480 [ 53.217975][ T7359] [ 53.220284][ T7359] write to 0xffff88812092e9ec of 4 bytes by interrupt on cpu 0: [ 53.228234][ T7359] tcp_add_backlog+0x4a0/0xcc0 [ 53.232981][ T7359] tcp_v4_rcv+0x1aba/0x1bf0 [ 53.237484][ T7359] ip_protocol_deliver_rcu+0x51/0x470 [ 53.242834][ T7359] ip_local_deliver_finish+0x110/0x140 [ 53.248279][ T7359] ip_local_deliver+0x133/0x210 [ 53.253119][ T7359] ip_rcv_finish+0x121/0x160 [ 53.257698][ T7359] ip_rcv+0x18f/0x1a0 [ 53.261661][ T7359] __netif_receive_skb_one_core+0xa7/0xe0 [ 53.267460][ T7359] __netif_receive_skb+0x37/0xf0 [ 53.272375][ T7359] netif_receive_skb_internal+0x59/0x190 [ 53.277992][ T7359] napi_gro_receive+0x28f/0x330 [ 53.282830][ T7359] receive_buf+0x284/0x30b0 [ 53.290732][ T7359] virtnet_poll+0x436/0x7d0 [ 53.295266][ T7359] net_rx_action+0x3ae/0xa50 [ 53.299829][ T7359] [ 53.302153][ T7359] read to 0xffff88812092e9ec of 4 bytes by task 7359 on cpu 1: [ 53.309804][ T7359] tcp_grow_window.isra.0+0x6b/0x480 [ 53.315084][ T7359] tcp_event_data_recv+0x68f/0x990 [ 53.320179][ T7359] tcp_rcv_established+0xbfe/0xf50 [ 53.325359][ T7359] tcp_v4_do_rcv+0x381/0x4e0 [ 53.329927][ T7359] __release_sock+0x135/0x1e0 [ 53.334593][ T7359] release_sock+0x61/0x160 [ 53.338992][ T7359] tcp_recvmsg+0x63b/0x1a30 [ 53.343481][ T7359] inet_recvmsg+0xbb/0x250 [ 53.347877][ T7359] sock_recvmsg+0x92/0xb0 [ 53.352181][ T7359] sock_read_iter+0x15f/0x1e0 [ 53.356839][ T7359] new_sync_read+0x389/0x4f0 [ 53.361403][ T7359] __vfs_read+0xb1/0xc0 [ 53.365532][ T7359] vfs_read+0x143/0x2c0 [ 53.369656][ T7359] [ 53.371956][ T7359] Reported by Kernel Concurrency Sanitizer on: [ 53.378115][ T7359] CPU: 1 PID: 7359 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.385194][ T7359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.395244][ T7359] ================================================================== [ 53.403279][ T7359] Kernel panic - not syncing: panic_on_warn set ... [ 53.409842][ T7359] CPU: 1 PID: 7359 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.416921][ T7359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.427038][ T7359] Call Trace: [ 53.430322][ T7359] dump_stack+0xf5/0x159 [ 53.434567][ T7359] panic+0x209/0x639 [ 53.438626][ T7359] ? vprintk_func+0x8d/0x140 [ 53.443292][ T7359] kcsan_report.cold+0x57/0xeb [ 53.448065][ T7359] __kcsan_setup_watchpoint+0x342/0x500 [ 53.453685][ T7359] __tsan_read4+0x2c/0x30 [ 53.458006][ T7359] tcp_grow_window.isra.0+0x6b/0x480 [ 53.463285][ T7359] tcp_event_data_recv+0x68f/0x990 [ 53.469663][ T7359] tcp_rcv_established+0xbfe/0xf50 [ 53.474788][ T7359] ? ipv4_dst_check+0xc6/0xf0 [ 53.479447][ T7359] tcp_v4_do_rcv+0x381/0x4e0 [ 53.484112][ T7359] __release_sock+0x135/0x1e0 [ 53.488784][ T7359] release_sock+0x61/0x160 [ 53.493180][ T7359] tcp_recvmsg+0x63b/0x1a30 [ 53.497932][ T7359] inet_recvmsg+0xbb/0x250 [ 53.503120][ T7359] ? __tsan_read8+0x2c/0x30 [ 53.507734][ T7359] ? inet_sendpage+0x100/0x100 [ 53.512741][ T7359] sock_recvmsg+0x92/0xb0 [ 53.517057][ T7359] sock_read_iter+0x15f/0x1e0 [ 53.521823][ T7359] new_sync_read+0x389/0x4f0 [ 53.526405][ T7359] __vfs_read+0xb1/0xc0 [ 53.530563][ T7359] vfs_read+0x143/0x2c0 [ 53.534855][ T7359] ksys_read+0xd5/0x1b0 [ 53.539015][ T7359] __x64_sys_read+0x4c/0x60 [ 53.543510][ T7359] do_syscall_64+0xcf/0x2f0 [ 53.548005][ T7359] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.554575][ T7359] RIP: 0033:0x47c530 [ 53.558461][ T7359] 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 [ 53.578076][ T7359] RSP: 002b:000000c4203357d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.586470][ T7359] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.594512][ T7359] RDX: 0000000000001000 RSI: 000000c4202cc000 RDI: 0000000000000003 [ 53.602921][ T7359] RBP: 000000c420335830 R08: 0000000000000000 R09: 0000000000000000 [ 53.610877][ T7359] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000200 [ 53.618827][ T7359] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 53.628296][ T7359] Kernel Offset: disabled [ 53.632717][ T7359] Rebooting in 86400 seconds..