[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.774185][ T26] audit: type=1800 audit(1570773751.420:25): pid=7149 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.801693][ T26] audit: type=1800 audit(1570773751.430:26): pid=7149 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.838260][ T26] audit: type=1800 audit(1570773751.430:27): pid=7149 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 '10.128.0.155' (ECDSA) to the list of known hosts. 2019/10/11 06:02:39 fuzzer started 2019/10/11 06:02:41 dialing manager at 10.128.0.105:37331 2019/10/11 06:02:41 syscalls: 2523 2019/10/11 06:02:41 code coverage: enabled 2019/10/11 06:02:41 comparison tracing: enabled 2019/10/11 06:02:41 extra coverage: extra coverage is not supported by the kernel 2019/10/11 06:02:41 setuid sandbox: enabled 2019/10/11 06:02:41 namespace sandbox: enabled 2019/10/11 06:02:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 06:02:41 fault injection: enabled 2019/10/11 06:02:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 06:02:41 net packet injection: enabled 2019/10/11 06:02:41 net device setup: enabled 2019/10/11 06:02:41 concurrency sanitizer: enabled syzkaller login: [ 46.527743][ T7309] ================================================================== [ 46.536153][ T7309] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 46.543947][ T7309] [ 46.546275][ T7309] read to 0xffff88812644a14c of 4 bytes by interrupt on cpu 1: [ 46.553816][ T7309] tcp_add_backlog+0x43/0xcc0 [ 46.558487][ T7309] tcp_v4_rcv+0x1aba/0x1bf0 [ 46.562969][ T7309] ip_protocol_deliver_rcu+0x51/0x470 [ 46.568319][ T7309] ip_local_deliver_finish+0x110/0x140 [ 46.573860][ T7309] ip_local_deliver+0x133/0x210 [ 46.578985][ T7309] ip_rcv_finish+0x121/0x160 [ 46.583575][ T7309] ip_rcv+0x18f/0x1a0 [ 46.587660][ T7309] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.593655][ T7309] __netif_receive_skb+0x37/0xf0 [ 46.598744][ T7309] netif_receive_skb_internal+0x59/0x190 [ 46.604970][ T7309] napi_gro_receive+0x28f/0x330 [ 46.609809][ T7309] receive_buf+0x284/0x30b0 [ 46.614298][ T7309] virtnet_poll+0x436/0x7d0 [ 46.618793][ T7309] net_rx_action+0x3ae/0xa50 [ 46.623354][ T7309] [ 46.625667][ T7309] write to 0xffff88812644a14c of 4 bytes by task 7309 on cpu 0: [ 46.633276][ T7309] tcp_rcv_space_adjust+0x40f/0x4c0 [ 46.638472][ T7309] tcp_recvmsg+0xdaa/0x1a30 [ 46.642957][ T7309] inet_recvmsg+0xbb/0x250 [ 46.647367][ T7309] sock_recvmsg+0x92/0xb0 [ 46.651674][ T7309] sock_read_iter+0x15f/0x1e0 [ 46.656332][ T7309] new_sync_read+0x389/0x4f0 [ 46.660939][ T7309] __vfs_read+0xb1/0xc0 [ 46.665089][ T7309] vfs_read+0x143/0x2c0 [ 46.669221][ T7309] ksys_read+0xd5/0x1b0 [ 46.673364][ T7309] __x64_sys_read+0x4c/0x60 [ 46.677864][ T7309] do_syscall_64+0xcf/0x2f0 [ 46.682348][ T7309] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.688219][ T7309] [ 46.690522][ T7309] Reported by Kernel Concurrency Sanitizer on: [ 46.696750][ T7309] CPU: 0 PID: 7309 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.703851][ T7309] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.714037][ T7309] ================================================================== [ 46.722698][ T7309] Kernel panic - not syncing: panic_on_warn set ... [ 46.729263][ T7309] CPU: 0 PID: 7309 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.739644][ T7309] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.749763][ T7309] Call Trace: [ 46.753037][ T7309] dump_stack+0xf5/0x159 [ 46.757301][ T7309] panic+0x209/0x639 [ 46.761266][ T7309] ? ksys_read+0xd5/0x1b0 [ 46.765597][ T7309] ? vprintk_func+0x8d/0x140 [ 46.770169][ T7309] kcsan_report.cold+0xc/0x1b [ 46.774828][ T7309] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.780354][ T7309] __tsan_write4+0x32/0x40 [ 46.785022][ T7309] tcp_rcv_space_adjust+0x40f/0x4c0 [ 46.790211][ T7309] tcp_recvmsg+0xdaa/0x1a30 [ 46.795827][ T7309] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.801451][ T7309] inet_recvmsg+0xbb/0x250 [ 46.805846][ T7309] ? __tsan_read8+0x2c/0x30 [ 46.810329][ T7309] ? inet_sendpage+0x100/0x100 [ 46.815084][ T7309] sock_recvmsg+0x92/0xb0 [ 46.819394][ T7309] sock_read_iter+0x15f/0x1e0 [ 46.824158][ T7309] new_sync_read+0x389/0x4f0 [ 46.828746][ T7309] __vfs_read+0xb1/0xc0 [ 46.832886][ T7309] vfs_read+0x143/0x2c0 [ 46.837033][ T7309] ksys_read+0xd5/0x1b0 [ 46.841183][ T7309] __x64_sys_read+0x4c/0x60 [ 46.845847][ T7309] do_syscall_64+0xcf/0x2f0 [ 46.850343][ T7309] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.856210][ T7309] RIP: 0033:0x47c530 [ 46.860088][ T7309] 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 [ 46.879754][ T7309] RSP: 002b:000000c42035b7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.888151][ T7309] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.896099][ T7309] RDX: 0000000000001000 RSI: 000000c42013a000 RDI: 0000000000000003 [ 46.904049][ T7309] RBP: 000000c42035b830 R08: 0000000000000000 R09: 0000000000000000 [ 46.911997][ T7309] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 46.919950][ T7309] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.929690][ T7309] Kernel Offset: disabled [ 46.934286][ T7309] Rebooting in 86400 seconds..