[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.189837][ T25] audit: type=1800 audit(1570855565.586:25): pid=7051 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.242473][ T25] audit: type=1800 audit(1570855565.586:26): pid=7051 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.262657][ T25] audit: type=1800 audit(1570855565.586:27): pid=7051 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 '10.128.1.31' (ECDSA) to the list of known hosts. 2019/10/12 04:46:16 fuzzer started 2019/10/12 04:46:17 dialing manager at 10.128.0.105:43913 2019/10/12 04:46:17 syscalls: 2523 2019/10/12 04:46:17 code coverage: enabled 2019/10/12 04:46:17 comparison tracing: enabled 2019/10/12 04:46:17 extra coverage: extra coverage is not supported by the kernel 2019/10/12 04:46:17 setuid sandbox: enabled 2019/10/12 04:46:17 namespace sandbox: enabled 2019/10/12 04:46:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 04:46:17 fault injection: enabled 2019/10/12 04:46:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 04:46:17 net packet injection: enabled 2019/10/12 04:46:17 net device setup: enabled 2019/10/12 04:46:17 concurrency sanitizer: enabled syzkaller login: [ 47.354011][ T7213] ================================================================== [ 47.362148][ T7213] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 47.369939][ T7213] [ 47.372246][ T7213] read to 0xffff8881231df30c of 4 bytes by interrupt on cpu 0: [ 47.379765][ T7213] tcp_add_backlog+0x43/0xcc0 [ 47.384416][ T7213] tcp_v4_rcv+0x1aba/0x1bf0 [ 47.388894][ T7213] ip_protocol_deliver_rcu+0x51/0x470 [ 47.394288][ T7213] ip_local_deliver_finish+0x110/0x140 [ 47.399723][ T7213] ip_local_deliver+0x133/0x210 [ 47.404551][ T7213] ip_rcv_finish+0x121/0x160 [ 47.409113][ T7213] ip_rcv+0x18f/0x1a0 [ 47.413071][ T7213] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.418763][ T7213] __netif_receive_skb+0x37/0xf0 [ 47.423675][ T7213] netif_receive_skb_internal+0x59/0x190 [ 47.429286][ T7213] napi_gro_receive+0x28f/0x330 [ 47.434146][ T7213] receive_buf+0x284/0x30b0 [ 47.438626][ T7213] virtnet_poll+0x436/0x7d0 [ 47.443103][ T7213] net_rx_action+0x3ae/0xa50 [ 47.447664][ T7213] [ 47.449974][ T7213] write to 0xffff8881231df30c of 4 bytes by task 7213 on cpu 1: [ 47.457579][ T7213] tcp_rcv_space_adjust+0x40f/0x4c0 [ 47.462759][ T7213] tcp_recvmsg+0xdaa/0x1a30 [ 47.467249][ T7213] inet_recvmsg+0xbb/0x250 [ 47.471649][ T7213] sock_recvmsg+0x92/0xb0 [ 47.475950][ T7213] sock_read_iter+0x15f/0x1e0 [ 47.480605][ T7213] new_sync_read+0x389/0x4f0 [ 47.485183][ T7213] __vfs_read+0xb1/0xc0 [ 47.489318][ T7213] vfs_read+0x143/0x2c0 [ 47.493449][ T7213] ksys_read+0xd5/0x1b0 [ 47.497580][ T7213] __x64_sys_read+0x4c/0x60 [ 47.502064][ T7213] do_syscall_64+0xcf/0x2f0 [ 47.506545][ T7213] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.512402][ T7213] [ 47.514703][ T7213] Reported by Kernel Concurrency Sanitizer on: [ 47.520831][ T7213] CPU: 1 PID: 7213 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.527923][ T7213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.537952][ T7213] ================================================================== [ 47.545989][ T7213] Kernel panic - not syncing: panic_on_warn set ... [ 47.552552][ T7213] CPU: 1 PID: 7213 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.559630][ T7213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.569662][ T7213] Call Trace: [ 47.572932][ T7213] dump_stack+0xf5/0x159 [ 47.577154][ T7213] panic+0x209/0x639 [ 47.581029][ T7213] ? ksys_read+0xd5/0x1b0 [ 47.585337][ T7213] ? vprintk_func+0x8d/0x140 [ 47.589915][ T7213] kcsan_report.cold+0xc/0x1b [ 47.594573][ T7213] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.600095][ T7213] __tsan_write4+0x32/0x40 [ 47.604489][ T7213] tcp_rcv_space_adjust+0x40f/0x4c0 [ 47.609665][ T7213] tcp_recvmsg+0xdaa/0x1a30 [ 47.614148][ T7213] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.619757][ T7213] inet_recvmsg+0xbb/0x250 [ 47.624160][ T7213] ? __tsan_read8+0x2c/0x30 [ 47.628650][ T7213] ? inet_sendpage+0x100/0x100 [ 47.633388][ T7213] sock_recvmsg+0x92/0xb0 [ 47.637692][ T7213] sock_read_iter+0x15f/0x1e0 [ 47.642350][ T7213] new_sync_read+0x389/0x4f0 [ 47.646919][ T7213] __vfs_read+0xb1/0xc0 [ 47.651052][ T7213] vfs_read+0x143/0x2c0 [ 47.655186][ T7213] ksys_read+0xd5/0x1b0 [ 47.659334][ T7213] __x64_sys_read+0x4c/0x60 [ 47.663831][ T7213] do_syscall_64+0xcf/0x2f0 [ 47.668316][ T7213] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.674194][ T7213] RIP: 0033:0x47c530 [ 47.678070][ T7213] 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 [ 47.697650][ T7213] RSP: 002b:000000c4203cf7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 47.706037][ T7213] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.713982][ T7213] RDX: 0000000000001000 RSI: 000000c4201a4000 RDI: 0000000000000003 [ 47.721938][ T7213] RBP: 000000c4203cf830 R08: 0000000000000000 R09: 0000000000000000 [ 47.729934][ T7213] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000200 [ 47.737885][ T7213] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 47.747172][ T7213] Kernel Offset: disabled [ 47.751491][ T7213] Rebooting in 86400 seconds..