[ 37.981240][ T25] audit: type=1800 audit(1571771399.993:25): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.017905][ T25] audit: type=1800 audit(1571771399.993:26): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.039611][ T25] audit: type=1800 audit(1571771399.993:27): pid=7045 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. [ 38.499010][ T7112] sshd (7112) 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 '10.128.0.20' (ECDSA) to the list of known hosts. 2019/10/22 19:10:11 fuzzer started 2019/10/22 19:10:12 dialing manager at 10.128.0.105:33369 2019/10/22 19:10:12 syscalls: 2524 2019/10/22 19:10:12 code coverage: enabled 2019/10/22 19:10:12 comparison tracing: enabled 2019/10/22 19:10:12 extra coverage: extra coverage is not supported by the kernel 2019/10/22 19:10:12 setuid sandbox: enabled 2019/10/22 19:10:12 namespace sandbox: enabled 2019/10/22 19:10:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 19:10:12 fault injection: enabled 2019/10/22 19:10:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 19:10:12 net packet injection: enabled 2019/10/22 19:10:12 net device setup: enabled 2019/10/22 19:10:12 concurrency sanitizer: enabled syzkaller login: [ 51.169981][ T7209] ================================================================== [ 51.178122][ T7209] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 51.186341][ T7209] [ 51.188652][ T7209] read to 0xffff88812094a808 of 4 bytes by interrupt on cpu 0: [ 51.196195][ T7209] __nf_ct_refresh_acct+0xd4/0x1b0 [ 51.201282][ T7209] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.206888][ T7209] nf_conntrack_in+0x410/0xa80 [ 51.211628][ T7209] ipv4_conntrack_in+0x27/0x40 [ 51.216366][ T7209] nf_hook_slow+0x83/0x160 [ 51.220758][ T7209] ip_rcv+0x12f/0x1a0 [ 51.224729][ T7209] __netif_receive_skb_one_core+0xa7/0xe0 [ 51.230444][ T7209] __netif_receive_skb+0x37/0xf0 [ 51.235373][ T7209] netif_receive_skb_internal+0x59/0x190 [ 51.242107][ T7209] napi_gro_receive+0x28f/0x330 [ 51.246933][ T7209] receive_buf+0x284/0x30b0 [ 51.251431][ T7209] virtnet_poll+0x436/0x7d0 [ 51.255911][ T7209] net_rx_action+0x3ae/0xa90 [ 51.260484][ T7209] __do_softirq+0x115/0x33f [ 51.264956][ T7209] [ 51.267264][ T7209] write to 0xffff88812094a808 of 4 bytes by task 7209 on cpu 1: [ 51.274875][ T7209] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.279976][ T7209] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.285585][ T7209] nf_conntrack_in+0x410/0xa80 [ 51.290340][ T7209] ipv4_conntrack_local+0xbe/0x130 [ 51.295429][ T7209] nf_hook_slow+0x83/0x160 [ 51.299834][ T7209] __ip_local_out+0x1f7/0x2b0 [ 51.304499][ T7209] ip_local_out+0x31/0x90 [ 51.308820][ T7209] __ip_queue_xmit+0x3a8/0xa40 [ 51.313595][ T7209] ip_queue_xmit+0x45/0x60 [ 51.317991][ T7209] __tcp_transmit_skb+0xe81/0x1d60 [ 51.323079][ T7209] __tcp_send_ack+0x246/0x300 [ 51.327734][ T7209] tcp_send_ack+0x34/0x40 [ 51.332072][ T7209] tcp_cleanup_rbuf+0x130/0x360 [ 51.336890][ T7209] [ 51.339199][ T7209] Reported by Kernel Concurrency Sanitizer on: [ 51.345341][ T7209] CPU: 1 PID: 7209 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.352885][ T7209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.362921][ T7209] ================================================================== [ 51.370965][ T7209] Kernel panic - not syncing: panic_on_warn set ... [ 51.377541][ T7209] CPU: 1 PID: 7209 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.384977][ T7209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.395190][ T7209] Call Trace: [ 51.398473][ T7209] dump_stack+0xf5/0x159 [ 51.402694][ T7209] panic+0x210/0x640 [ 51.406570][ T7209] ? ip_queue_xmit+0x45/0x60 [ 51.411146][ T7209] ? vprintk_func+0x8d/0x140 [ 51.415716][ T7209] kcsan_report.cold+0xc/0x10 [ 51.420384][ T7209] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 51.425918][ T7209] __tsan_write4+0x32/0x40 [ 51.430322][ T7209] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.435410][ T7209] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.440960][ T7209] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 51.446573][ T7209] nf_conntrack_in+0x410/0xa80 [ 51.451318][ T7209] ipv4_conntrack_local+0xbe/0x130 [ 51.456420][ T7209] nf_hook_slow+0x83/0x160 [ 51.460899][ T7209] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 51.465638][ T7209] __ip_local_out+0x1f7/0x2b0 [ 51.470311][ T7209] ? constant_test_bit+0x30/0x30 [ 51.475228][ T7209] ip_local_out+0x31/0x90 [ 51.479543][ T7209] __ip_queue_xmit+0x3a8/0xa40 [ 51.484294][ T7209] ip_queue_xmit+0x45/0x60 [ 51.488696][ T7209] __tcp_transmit_skb+0xe81/0x1d60 [ 51.493791][ T7209] __tcp_send_ack+0x246/0x300 [ 51.498456][ T7209] tcp_send_ack+0x34/0x40 [ 51.502773][ T7209] tcp_cleanup_rbuf+0x130/0x360 [ 51.507775][ T7209] tcp_recvmsg+0x633/0x1a30 [ 51.512273][ T7209] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 51.517884][ T7209] inet_recvmsg+0xbb/0x250 [ 51.522457][ T7209] ? __tsan_read8+0x2c/0x30 [ 51.526955][ T7209] ? inet_sendpage+0x100/0x100 [ 51.533013][ T7209] sock_recvmsg+0x92/0xb0 [ 51.537345][ T7209] sock_read_iter+0x15f/0x1e0 [ 51.542017][ T7209] new_sync_read+0x389/0x4f0 [ 51.546586][ T7209] __vfs_read+0xb1/0xc0 [ 51.550720][ T7209] vfs_read+0x143/0x2c0 [ 51.554852][ T7209] ksys_read+0xd5/0x1b0 [ 51.558989][ T7209] __x64_sys_read+0x4c/0x60 [ 51.563472][ T7209] do_syscall_64+0xcc/0x370 [ 51.567965][ T7209] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.573831][ T7209] RIP: 0033:0x47c530 [ 51.577724][ T7209] 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 [ 51.597316][ T7209] RSP: 002b:000000c4203cf7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 51.605718][ T7209] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 51.613672][ T7209] RDX: 0000000000001000 RSI: 000000c42009c000 RDI: 0000000000000003 [ 51.621622][ T7209] RBP: 000000c4203cf830 R08: 0000000000000000 R09: 0000000000000000 [ 51.629570][ T7209] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020 [ 51.637535][ T7209] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 51.646826][ T7209] Kernel Offset: disabled [ 51.651147][ T7209] Rebooting in 86400 seconds..