[ 42.369570][ T26] audit: type=1800 audit(1572322242.587:22): pid=7254 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 42.391543][ T26] audit: type=1800 audit(1572322242.587:23): pid=7254 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 42.413093][ T26] audit: type=1800 audit(1572322242.587:24): pid=7254 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 '10.128.1.61' (ECDSA) to the list of known hosts. 2019/10/29 04:10:54 fuzzer started 2019/10/29 04:10:55 dialing manager at 10.128.0.105:40771 2019/10/29 04:10:55 syscalls: 2540 2019/10/29 04:10:55 code coverage: enabled 2019/10/29 04:10:55 comparison tracing: enabled 2019/10/29 04:10:55 extra coverage: extra coverage is not supported by the kernel 2019/10/29 04:10:55 setuid sandbox: enabled 2019/10/29 04:10:55 namespace sandbox: enabled 2019/10/29 04:10:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/29 04:10:55 fault injection: enabled 2019/10/29 04:10:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/29 04:10:55 net packet injection: enabled 2019/10/29 04:10:55 net device setup: enabled 2019/10/29 04:10:55 concurrency sanitizer: enabled 2019/10/29 04:10:57 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'do_exit' 'tomoyo_supervisor' '__nf_conntrack_find_get' 'task_dump_owner' 'generic_permission' 'do_nanosleep' syzkaller login: [ 57.187430][ T7421] ================================================================== [ 57.195570][ T7421] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 57.202572][ T7421] [ 57.204900][ T7421] write to 0xffff888124307338 of 8 bytes by interrupt on cpu 1: [ 57.212527][ T7421] tcp_add_backlog+0x45a/0xcc0 [ 57.217288][ T7421] tcp_v4_rcv+0x1a60/0x1bb0 [ 57.221780][ T7421] ip_protocol_deliver_rcu+0x4d/0x420 [ 57.227132][ T7421] ip_local_deliver_finish+0x110/0x140 [ 57.232568][ T7421] ip_local_deliver+0x133/0x210 [ 57.238436][ T7421] ip_rcv_finish+0x121/0x160 [ 57.243001][ T7421] ip_rcv+0x18f/0x1a0 [ 57.246985][ T7421] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.252680][ T7421] __netif_receive_skb+0x37/0xf0 [ 57.257607][ T7421] netif_receive_skb_internal+0x59/0x190 [ 57.263304][ T7421] napi_gro_receive+0x28f/0x330 [ 57.268147][ T7421] receive_buf+0x284/0x30b0 [ 57.272626][ T7421] virtnet_poll+0x436/0x7d0 [ 57.277108][ T7421] net_rx_action+0x3ae/0xa90 [ 57.281670][ T7421] [ 57.283996][ T7421] read to 0xffff888124307338 of 8 bytes by task 7421 on cpu 0: [ 57.291529][ T7421] tcp_recvmsg+0x470/0x1a30 [ 57.296019][ T7421] inet_recvmsg+0xbb/0x250 [ 57.300426][ T7421] sock_recvmsg+0x92/0xb0 [ 57.304771][ T7421] sock_read_iter+0x15f/0x1e0 [ 57.309438][ T7421] new_sync_read+0x389/0x4f0 [ 57.314005][ T7421] __vfs_read+0xb1/0xc0 [ 57.318138][ T7421] vfs_read+0x143/0x2c0 [ 57.322270][ T7421] ksys_read+0xd5/0x1b0 [ 57.326403][ T7421] __x64_sys_read+0x4c/0x60 [ 57.334620][ T7421] do_syscall_64+0xcc/0x370 [ 57.339105][ T7421] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.344967][ T7421] [ 57.347274][ T7421] Reported by Kernel Concurrency Sanitizer on: [ 57.353411][ T7421] CPU: 0 PID: 7421 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.361984][ T7421] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.372018][ T7421] ================================================================== [ 57.380079][ T7421] Kernel panic - not syncing: panic_on_warn set ... [ 57.386652][ T7421] CPU: 0 PID: 7421 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.394080][ T7421] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.405687][ T7421] Call Trace: [ 57.408963][ T7421] dump_stack+0xf5/0x159 [ 57.413184][ T7421] panic+0x210/0x640 [ 57.417061][ T7421] ? __x64_sys_read+0x4c/0x60 [ 57.421732][ T7421] ? vprintk_func+0x8d/0x140 [ 57.426321][ T7421] kcsan_report.cold+0xc/0x10 [ 57.431011][ T7421] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 57.436549][ T7421] __tsan_read8+0x2c/0x30 [ 57.440870][ T7421] tcp_recvmsg+0x470/0x1a30 [ 57.445377][ T7421] inet_recvmsg+0xbb/0x250 [ 57.449777][ T7421] ? __tsan_read8+0x2c/0x30 [ 57.454261][ T7421] ? inet_sendpage+0x100/0x100 [ 57.459050][ T7421] sock_recvmsg+0x92/0xb0 [ 57.463370][ T7421] sock_read_iter+0x15f/0x1e0 [ 57.468044][ T7421] new_sync_read+0x389/0x4f0 [ 57.472623][ T7421] __vfs_read+0xb1/0xc0 [ 57.476756][ T7421] vfs_read+0x143/0x2c0 [ 57.480892][ T7421] ksys_read+0xd5/0x1b0 [ 57.485026][ T7421] __x64_sys_read+0x4c/0x60 [ 57.489527][ T7421] do_syscall_64+0xcc/0x370 [ 57.494030][ T7421] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.499899][ T7421] RIP: 0033:0x47c530 [ 57.503787][ T7421] 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 [ 57.523478][ T7421] RSP: 002b:000000c4202df7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 57.531868][ T7421] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.539915][ T7421] RDX: 0000000000001000 RSI: 000000c4203b2000 RDI: 0000000000000003 [ 57.547874][ T7421] RBP: 000000c4202df830 R08: 0000000000000000 R09: 0000000000000000 [ 57.555825][ T7421] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000003 [ 57.563775][ T7421] R13: 000000c420082db8 R14: 0000000000000002 R15: ffffffffffffffff [ 57.573106][ T7421] Kernel Offset: disabled [ 57.577436][ T7421] Rebooting in 86400 seconds..