[ 40.049089][ T25] audit: type=1800 audit(1570714024.112:23): pid=7159 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 40.070189][ T25] audit: type=1800 audit(1570714024.112:24): pid=7159 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. [ 40.451084][ T25] audit: type=1800 audit(1570714024.582:25): pid=7159 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 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 '10.128.1.59' (ECDSA) to the list of known hosts. 2019/10/10 13:27:15 fuzzer started 2019/10/10 13:27:17 dialing manager at 10.128.0.105:34287 2019/10/10 13:27:17 syscalls: 2523 2019/10/10 13:27:17 code coverage: enabled 2019/10/10 13:27:17 comparison tracing: enabled 2019/10/10 13:27:17 extra coverage: extra coverage is not supported by the kernel 2019/10/10 13:27:17 setuid sandbox: enabled 2019/10/10 13:27:17 namespace sandbox: enabled 2019/10/10 13:27:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 13:27:17 fault injection: enabled 2019/10/10 13:27:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 13:27:17 net packet injection: enabled 2019/10/10 13:27:17 net device setup: enabled 2019/10/10 13:27:17 concurrency sanitizer: enabled syzkaller login: [ 53.243432][ T7322] ================================================================== [ 53.252284][ T7322] BUG: KCSAN: data-race in tcp_add_backlog / tcp_try_rmem_schedule [ 53.260151][ T7322] [ 53.262459][ T7322] read to 0xffff8881231cd30c of 4 bytes by interrupt on cpu 1: [ 53.270548][ T7322] tcp_add_backlog+0x43/0xcc0 [ 53.275337][ T7322] tcp_v4_rcv+0x1aba/0x1bf0 [ 53.280010][ T7322] ip_protocol_deliver_rcu+0x51/0x470 [ 53.285384][ T7322] ip_local_deliver_finish+0x110/0x140 [ 53.290846][ T7322] ip_local_deliver+0x133/0x210 [ 53.295778][ T7322] ip_rcv_finish+0x121/0x160 [ 53.300353][ T7322] ip_rcv+0x18f/0x1a0 [ 53.304318][ T7322] __netif_receive_skb_one_core+0xa7/0xe0 [ 53.310015][ T7322] __netif_receive_skb+0x37/0xf0 [ 53.314972][ T7322] netif_receive_skb_internal+0x59/0x190 [ 53.320602][ T7322] napi_gro_receive+0x28f/0x330 [ 53.325438][ T7322] receive_buf+0x284/0x30b0 [ 53.329923][ T7322] virtnet_poll+0x436/0x7d0 [ 53.334403][ T7322] net_rx_action+0x3ae/0xa50 [ 53.338964][ T7322] [ 53.341281][ T7322] write to 0xffff8881231cd30c of 4 bytes by task 7322 on cpu 0: [ 53.348989][ T7322] tcp_try_rmem_schedule+0x294/0xb90 [ 53.354263][ T7322] tcp_data_queue+0x7ba/0x2000 [ 53.359010][ T7322] tcp_rcv_established+0x517/0xf50 [ 53.364289][ T7322] tcp_v4_do_rcv+0x381/0x4e0 [ 53.368874][ T7322] __release_sock+0x135/0x1e0 [ 53.373581][ T7322] release_sock+0x61/0x160 [ 53.377992][ T7322] tcp_recvmsg+0x63b/0x1a30 [ 53.382481][ T7322] inet_recvmsg+0xbb/0x250 [ 53.386878][ T7322] sock_recvmsg+0x92/0xb0 [ 53.391195][ T7322] sock_read_iter+0x15f/0x1e0 [ 53.395857][ T7322] new_sync_read+0x389/0x4f0 [ 53.400445][ T7322] __vfs_read+0xb1/0xc0 [ 53.404584][ T7322] vfs_read+0x143/0x2c0 [ 53.408723][ T7322] [ 53.411026][ T7322] Reported by Kernel Concurrency Sanitizer on: [ 53.417160][ T7322] CPU: 0 PID: 7322 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.424245][ T7322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.434310][ T7322] ================================================================== [ 53.442364][ T7322] Kernel panic - not syncing: panic_on_warn set ... [ 53.448957][ T7322] CPU: 0 PID: 7322 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.456062][ T7322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.466576][ T7322] Call Trace: [ 53.470388][ T7322] dump_stack+0xf5/0x159 [ 53.474616][ T7322] panic+0x209/0x639 [ 53.478496][ T7322] ? sock_recvmsg+0x92/0xb0 [ 53.483018][ T7322] ? vprintk_func+0x8d/0x140 [ 53.487952][ T7322] kcsan_report.cold+0xc/0x1b [ 53.492645][ T7322] __kcsan_setup_watchpoint+0x3ee/0x510 [ 53.498174][ T7322] __tsan_write4+0x32/0x40 [ 53.502592][ T7322] tcp_try_rmem_schedule+0x294/0xb90 [ 53.507864][ T7322] tcp_data_queue+0x7ba/0x2000 [ 53.512785][ T7322] ? tcp_urg+0xa1/0x5c0 [ 53.517011][ T7322] tcp_rcv_established+0x517/0xf50 [ 53.522107][ T7322] ? ipv4_dst_check+0xc6/0xf0 [ 53.526766][ T7322] tcp_v4_do_rcv+0x381/0x4e0 [ 53.531351][ T7322] __release_sock+0x135/0x1e0 [ 53.536023][ T7322] release_sock+0x61/0x160 [ 53.540507][ T7322] tcp_recvmsg+0x63b/0x1a30 [ 53.545010][ T7322] ? __kcsan_setup_watchpoint+0x96/0x510 [ 53.550628][ T7322] inet_recvmsg+0xbb/0x250 [ 53.555023][ T7322] ? __tsan_read8+0x2c/0x30 [ 53.559518][ T7322] ? inet_sendpage+0x100/0x100 [ 53.564267][ T7322] sock_recvmsg+0x92/0xb0 [ 53.568577][ T7322] sock_read_iter+0x15f/0x1e0 [ 53.573238][ T7322] new_sync_read+0x389/0x4f0 [ 53.577827][ T7322] __vfs_read+0xb1/0xc0 [ 53.581972][ T7322] vfs_read+0x143/0x2c0 [ 53.586122][ T7322] ksys_read+0xd5/0x1b0 [ 53.590261][ T7322] __x64_sys_read+0x4c/0x60 [ 53.594746][ T7322] do_syscall_64+0xcf/0x2f0 [ 53.599240][ T7322] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.605127][ T7322] RIP: 0033:0x47c530 [ 53.609054][ T7322] 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 [ 53.628726][ T7322] RSP: 002b:000000c4203d3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 53.637128][ T7322] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.645296][ T7322] RDX: 0000000000001000 RSI: 000000c42032c000 RDI: 0000000000000003 [ 53.653483][ T7322] RBP: 000000c4203d3868 R08: 0000000000000000 R09: 0000000000000000 [ 53.661967][ T7322] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020 [ 53.670038][ T7322] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 53.679730][ T7322] Kernel Offset: disabled [ 53.684088][ T7322] Rebooting in 86400 seconds..