[ 42.462308][ T23] audit: type=1800 audit(1571779846.220:22): pid=7133 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 42.498274][ T23] audit: type=1800 audit(1571779846.220:23): pid=7133 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 42.518815][ T23] audit: type=1800 audit(1571779846.230:24): pid=7133 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. [....] 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 '10.128.10.33' (ECDSA) to the list of known hosts. 2019/10/22 21:30:58 fuzzer started 2019/10/22 21:31:00 dialing manager at 10.128.0.105:33369 2019/10/22 21:31:00 syscalls: 2524 2019/10/22 21:31:00 code coverage: enabled 2019/10/22 21:31:00 comparison tracing: enabled 2019/10/22 21:31:00 extra coverage: extra coverage is not supported by the kernel 2019/10/22 21:31:00 setuid sandbox: enabled 2019/10/22 21:31:00 namespace sandbox: enabled 2019/10/22 21:31:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 21:31:00 fault injection: enabled 2019/10/22 21:31:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 21:31:00 net packet injection: enabled 2019/10/22 21:31:00 net device setup: enabled 2019/10/22 21:31:00 concurrency sanitizer: enabled syzkaller login: [ 57.475090][ T7298] ================================================================== [ 57.483226][ T7298] BUG: KCSAN: data-race in tcp_add_backlog / tcp_grow_window.isra.0 [ 57.491305][ T7298] [ 57.493668][ T7298] write to 0xffff88811e0712ec of 4 bytes by interrupt on cpu 0: [ 57.501297][ T7298] tcp_add_backlog+0x4a0/0xcc0 [ 57.506042][ T7298] tcp_v4_rcv+0x1a60/0x1bb0 [ 57.510526][ T7298] ip_protocol_deliver_rcu+0x4d/0x420 [ 57.515877][ T7298] ip_local_deliver_finish+0x110/0x140 [ 57.521341][ T7298] ip_local_deliver+0x133/0x210 [ 57.526221][ T7298] ip_rcv_finish+0x121/0x160 [ 57.530837][ T7298] ip_rcv+0x18f/0x1a0 [ 57.534928][ T7298] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.540715][ T7298] __netif_receive_skb+0x37/0xf0 [ 57.545633][ T7298] netif_receive_skb_internal+0x59/0x190 [ 57.551241][ T7298] napi_gro_receive+0x28f/0x330 [ 57.556072][ T7298] receive_buf+0x284/0x30b0 [ 57.560548][ T7298] virtnet_poll+0x436/0x7d0 [ 57.565044][ T7298] net_rx_action+0x3ae/0xa90 [ 57.569606][ T7298] [ 57.571917][ T7298] read to 0xffff88811e0712ec of 4 bytes by task 7298 on cpu 1: [ 57.579442][ T7298] tcp_grow_window.isra.0+0x6b/0x480 [ 57.584704][ T7298] tcp_event_data_recv+0x68f/0x990 [ 57.589792][ T7298] tcp_rcv_established+0xbfe/0xf50 [ 57.594882][ T7298] tcp_v4_do_rcv+0x381/0x4e0 [ 57.599447][ T7298] __release_sock+0x135/0x1e0 [ 57.604184][ T7298] release_sock+0x61/0x160 [ 57.608577][ T7298] tcp_recvmsg+0x63b/0x1a30 [ 57.613069][ T7298] inet_recvmsg+0xbb/0x250 [ 57.617464][ T7298] sock_recvmsg+0x92/0xb0 [ 57.621769][ T7298] sock_read_iter+0x15f/0x1e0 [ 57.626429][ T7298] new_sync_read+0x389/0x4f0 [ 57.631006][ T7298] __vfs_read+0xb1/0xc0 [ 57.635147][ T7298] vfs_read+0x143/0x2c0 [ 57.639274][ T7298] [ 57.641575][ T7298] Reported by Kernel Concurrency Sanitizer on: [ 57.649451][ T7298] CPU: 1 PID: 7298 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.656878][ T7298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.666908][ T7298] ================================================================== [ 57.674944][ T7298] Kernel panic - not syncing: panic_on_warn set ... [ 57.681507][ T7298] CPU: 1 PID: 7298 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.688931][ T7298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.698960][ T7298] Call Trace: [ 57.702245][ T7298] dump_stack+0xf5/0x159 [ 57.706467][ T7298] panic+0x210/0x640 [ 57.710374][ T7298] ? sock_recvmsg+0x92/0xb0 [ 57.714857][ T7298] ? vprintk_func+0x8d/0x140 [ 57.719436][ T7298] kcsan_report.cold+0xc/0x10 [ 57.724136][ T7298] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 57.729669][ T7298] __tsan_read4+0x2c/0x30 [ 57.733985][ T7298] tcp_grow_window.isra.0+0x6b/0x480 [ 57.739249][ T7298] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 57.744865][ T7298] tcp_event_data_recv+0x68f/0x990 [ 57.749968][ T7298] tcp_rcv_established+0xbfe/0xf50 [ 57.755068][ T7298] ? ipv4_dst_check+0xc6/0xf0 [ 57.759724][ T7298] tcp_v4_do_rcv+0x381/0x4e0 [ 57.764383][ T7298] __release_sock+0x135/0x1e0 [ 57.769052][ T7298] release_sock+0x61/0x160 [ 57.773469][ T7298] tcp_recvmsg+0x63b/0x1a30 [ 57.777971][ T7298] inet_recvmsg+0xbb/0x250 [ 57.782379][ T7298] ? __tsan_read8+0x2c/0x30 [ 57.786878][ T7298] ? inet_sendpage+0x100/0x100 [ 57.791621][ T7298] sock_recvmsg+0x92/0xb0 [ 57.795928][ T7298] sock_read_iter+0x15f/0x1e0 [ 57.800585][ T7298] new_sync_read+0x389/0x4f0 [ 57.805166][ T7298] __vfs_read+0xb1/0xc0 [ 57.809298][ T7298] vfs_read+0x143/0x2c0 [ 57.813693][ T7298] ksys_read+0xd5/0x1b0 [ 57.817840][ T7298] __x64_sys_read+0x4c/0x60 [ 57.822323][ T7298] do_syscall_64+0xcc/0x370 [ 57.826825][ T7298] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.832716][ T7298] RIP: 0033:0x47c530 [ 57.836599][ T7298] 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 [ 57.856178][ T7298] RSP: 002b:000000c4203d57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 57.864563][ T7298] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.872511][ T7298] RDX: 0000000000001000 RSI: 000000c4202c6000 RDI: 0000000000000003 [ 57.880458][ T7298] RBP: 000000c4203d5830 R08: 0000000000000000 R09: 0000000000000000 [ 57.888419][ T7298] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 57.896367][ T7298] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 57.905763][ T7298] Kernel Offset: disabled [ 57.910082][ T7298] Rebooting in 86400 seconds..