[ 34.520284][ T26] audit: type=1800 audit(1571776847.667:25): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.549102][ T26] audit: type=1800 audit(1571776847.667:26): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.579453][ T26] audit: type=1800 audit(1571776847.667:27): pid=7075 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. [ 34.945790][ T7140] sshd (7140) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.57' (ECDSA) to the list of known hosts. 2019/10/22 20:40:55 fuzzer started 2019/10/22 20:40:57 dialing manager at 10.128.0.105:33369 2019/10/22 20:40:57 syscalls: 2524 2019/10/22 20:40:57 code coverage: enabled 2019/10/22 20:40:57 comparison tracing: enabled 2019/10/22 20:40:57 extra coverage: extra coverage is not supported by the kernel 2019/10/22 20:40:57 setuid sandbox: enabled 2019/10/22 20:40:57 namespace sandbox: enabled 2019/10/22 20:40:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 20:40:57 fault injection: enabled 2019/10/22 20:40:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 20:40:57 net packet injection: enabled 2019/10/22 20:40:57 net device setup: enabled 2019/10/22 20:40:57 concurrency sanitizer: enabled syzkaller login: [ 44.140737][ T7228] ================================================================== [ 44.148864][ T7228] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 44.157334][ T7228] [ 44.159639][ T7228] write to 0xffff8881239b1108 of 4 bytes by interrupt on cpu 0: [ 44.167247][ T7228] __nf_ct_refresh_acct+0xfb/0x1b0 [ 44.172335][ T7228] nf_conntrack_tcp_packet+0xd40/0x3390 [ 44.177857][ T7228] nf_conntrack_in+0x410/0xa80 [ 44.182743][ T7228] ipv4_conntrack_in+0x27/0x40 [ 44.187483][ T7228] nf_hook_slow+0x83/0x160 [ 44.191874][ T7228] ip_rcv+0x12f/0x1a0 [ 44.195844][ T7228] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.201545][ T7228] __netif_receive_skb+0x37/0xf0 [ 44.206523][ T7228] netif_receive_skb_internal+0x59/0x190 [ 44.212194][ T7228] napi_gro_receive+0x28f/0x330 [ 44.217060][ T7228] receive_buf+0x284/0x30b0 [ 44.221623][ T7228] virtnet_poll+0x436/0x7d0 [ 44.226151][ T7228] net_rx_action+0x3ae/0xa90 [ 44.230765][ T7228] __do_softirq+0x115/0x33f [ 44.235240][ T7228] [ 44.237548][ T7228] read to 0xffff8881239b1108 of 4 bytes by task 7228 on cpu 1: [ 44.245067][ T7228] __nf_conntrack_find_get+0x284/0x880 [ 44.250501][ T7228] nf_conntrack_in+0x2ef/0xa80 [ 44.255239][ T7228] ipv4_conntrack_local+0xbe/0x130 [ 44.260327][ T7228] nf_hook_slow+0x83/0x160 [ 44.264734][ T7228] __ip_local_out+0x1f7/0x2b0 [ 44.269403][ T7228] ip_local_out+0x31/0x90 [ 44.273715][ T7228] __ip_queue_xmit+0x3a8/0xa40 [ 44.278458][ T7228] ip_queue_xmit+0x45/0x60 [ 44.282848][ T7228] __tcp_transmit_skb+0xe81/0x1d60 [ 44.287934][ T7228] __tcp_send_ack+0x246/0x300 [ 44.292585][ T7228] tcp_send_ack+0x34/0x40 [ 44.296889][ T7228] tcp_cleanup_rbuf+0x130/0x360 [ 44.301717][ T7228] tcp_recvmsg+0x633/0x1a30 [ 44.306192][ T7228] [ 44.308495][ T7228] Reported by Kernel Concurrency Sanitizer on: [ 44.314623][ T7228] CPU: 1 PID: 7228 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.322049][ T7228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.332078][ T7228] ================================================================== [ 44.340111][ T7228] Kernel panic - not syncing: panic_on_warn set ... [ 44.346671][ T7228] CPU: 1 PID: 7228 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.354095][ T7228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.364221][ T7228] Call Trace: [ 44.367492][ T7228] dump_stack+0xf5/0x159 [ 44.371716][ T7228] panic+0x210/0x640 [ 44.375592][ T7228] ? __tcp_transmit_skb+0xe81/0x1d60 [ 44.380870][ T7228] ? vprintk_func+0x8d/0x140 [ 44.385452][ T7228] kcsan_report.cold+0xc/0x10 [ 44.390157][ T7228] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 44.395710][ T7228] __tsan_read4+0x2c/0x30 [ 44.400049][ T7228] __nf_conntrack_find_get+0x284/0x880 [ 44.405495][ T7228] ? __tsan_write2+0x32/0x40 [ 44.410065][ T7228] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 44.415682][ T7228] nf_conntrack_in+0x2ef/0xa80 [ 44.420453][ T7228] ipv4_conntrack_local+0xbe/0x130 [ 44.425546][ T7228] nf_hook_slow+0x83/0x160 [ 44.429950][ T7228] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 44.434692][ T7228] __ip_local_out+0x1f7/0x2b0 [ 44.439406][ T7228] ? constant_test_bit+0x30/0x30 [ 44.444334][ T7228] ip_local_out+0x31/0x90 [ 44.448698][ T7228] __ip_queue_xmit+0x3a8/0xa40 [ 44.453447][ T7228] ip_queue_xmit+0x45/0x60 [ 44.457852][ T7228] __tcp_transmit_skb+0xe81/0x1d60 [ 44.462949][ T7228] __tcp_send_ack+0x246/0x300 [ 44.467792][ T7228] tcp_send_ack+0x34/0x40 [ 44.472116][ T7228] tcp_cleanup_rbuf+0x130/0x360 [ 44.476969][ T7228] tcp_recvmsg+0x633/0x1a30 [ 44.481461][ T7228] inet_recvmsg+0xbb/0x250 [ 44.485864][ T7228] ? __tsan_read8+0x2c/0x30 [ 44.490347][ T7228] ? inet_sendpage+0x100/0x100 [ 44.495111][ T7228] sock_recvmsg+0x92/0xb0 [ 44.499420][ T7228] sock_read_iter+0x15f/0x1e0 [ 44.504077][ T7228] new_sync_read+0x389/0x4f0 [ 44.508650][ T7228] __vfs_read+0xb1/0xc0 [ 44.512782][ T7228] vfs_read+0x143/0x2c0 [ 44.516931][ T7228] ksys_read+0xd5/0x1b0 [ 44.521068][ T7228] __x64_sys_read+0x4c/0x60 [ 44.525566][ T7228] do_syscall_64+0xcc/0x370 [ 44.530051][ T7228] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.535933][ T7228] RIP: 0033:0x47c530 [ 44.539846][ T7228] 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 [ 44.559752][ T7228] RSP: 002b:000000c4203377d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 44.568146][ T7228] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 44.576137][ T7228] RDX: 0000000000001000 RSI: 000000c4200a6000 RDI: 0000000000000003 [ 44.584087][ T7228] RBP: 000000c420337830 R08: 0000000000000000 R09: 0000000000000000 [ 44.592271][ T7228] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 44.600236][ T7228] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 44.609903][ T7228] Kernel Offset: disabled [ 44.614256][ T7228] Rebooting in 86400 seconds..