[ 37.281076][ T25] audit: type=1800 audit(1571719154.749:25): pid=7047 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.319906][ T25] audit: type=1800 audit(1571719154.749:26): pid=7047 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.340591][ T25] audit: type=1800 audit(1571719154.749:27): pid=7047 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. [ 38.044893][ 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 '10.128.1.11' (ECDSA) to the list of known hosts. 2019/10/22 04:39:22 fuzzer started 2019/10/22 04:39:24 dialing manager at 10.128.0.105:37053 2019/10/22 04:39:24 syscalls: 2524 2019/10/22 04:39:24 code coverage: enabled 2019/10/22 04:39:24 comparison tracing: enabled 2019/10/22 04:39:24 extra coverage: extra coverage is not supported by the kernel 2019/10/22 04:39:24 setuid sandbox: enabled 2019/10/22 04:39:24 namespace sandbox: enabled 2019/10/22 04:39:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 04:39:24 fault injection: enabled 2019/10/22 04:39:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 04:39:24 net packet injection: enabled 2019/10/22 04:39:24 net device setup: enabled 2019/10/22 04:39:24 concurrency sanitizer: enabled syzkaller login: [ 48.422020][ C1] ================================================================== [ 48.430434][ C1] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 48.438957][ C1] [ 48.441280][ C1] write to 0xffff888126855808 of 4 bytes by task 7209 on cpu 0: [ 48.448892][ C1] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.453983][ C1] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.459557][ C1] nf_conntrack_in+0x410/0xa80 [ 48.464297][ C1] ipv4_conntrack_local+0xbe/0x130 [ 48.469424][ C1] nf_hook_slow+0x83/0x160 [ 48.473815][ C1] __ip_local_out+0x1f7/0x2b0 [ 48.478524][ C1] ip_local_out+0x31/0x90 [ 48.482830][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 48.487571][ C1] ip_queue_xmit+0x45/0x60 [ 48.492019][ C1] __tcp_transmit_skb+0xe81/0x1d60 [ 48.497143][ C1] __tcp_send_ack+0x246/0x300 [ 48.501797][ C1] tcp_send_ack+0x34/0x40 [ 48.506292][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 48.511118][ C1] tcp_recvmsg+0x633/0x1a30 [ 48.515717][ C1] [ 48.518024][ C1] read to 0xffff888126855808 of 4 bytes by interrupt on cpu 1: [ 48.525556][ C1] __nf_conntrack_find_get+0x284/0x880 [ 48.531004][ C1] nf_conntrack_in+0x2ef/0xa80 [ 48.535742][ C1] ipv4_conntrack_in+0x27/0x40 [ 48.540482][ C1] nf_hook_slow+0x83/0x160 [ 48.544901][ C1] ip_rcv+0x12f/0x1a0 [ 48.548872][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.554579][ C1] __netif_receive_skb+0x37/0xf0 [ 48.559533][ C1] netif_receive_skb_internal+0x59/0x190 [ 48.565141][ C1] napi_gro_receive+0x28f/0x330 [ 48.569968][ C1] receive_buf+0x284/0x30b0 [ 48.574443][ C1] virtnet_poll+0x436/0x7d0 [ 48.578921][ C1] net_rx_action+0x3ae/0xa90 [ 48.583503][ C1] __do_softirq+0x115/0x33f [ 48.587985][ C1] [ 48.590295][ C1] Reported by Kernel Concurrency Sanitizer on: [ 48.596515][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 48.603855][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.613914][ C1] ================================================================== [ 48.621947][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 48.628521][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 48.635861][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.645894][ C1] Call Trace: [ 48.649215][ C1] dump_stack+0xf5/0x159 [ 48.653434][ C1] panic+0x210/0x640 [ 48.657331][ C1] ? napi_gro_receive+0x28f/0x330 [ 48.662352][ C1] ? vprintk_func+0x8d/0x140 [ 48.666937][ C1] kcsan_report.cold+0xc/0x10 [ 48.671606][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.677138][ C1] __tsan_read4+0x2c/0x30 [ 48.681452][ C1] __nf_conntrack_find_get+0x284/0x880 [ 48.686898][ C1] ? __tsan_write2+0x32/0x40 [ 48.691567][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.697200][ C1] nf_conntrack_in+0x2ef/0xa80 [ 48.702078][ C1] ipv4_conntrack_in+0x27/0x40 [ 48.706835][ C1] nf_hook_slow+0x83/0x160 [ 48.711237][ C1] ? nf_ct_bridge_unregister+0x70/0x70 [ 48.716678][ C1] ip_rcv+0x12f/0x1a0 [ 48.720722][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 48.725552][ C1] ? ip_local_deliver+0x210/0x210 [ 48.730596][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.736297][ C1] __netif_receive_skb+0x37/0xf0 [ 48.741225][ C1] netif_receive_skb_internal+0x59/0x190 [ 48.746874][ C1] napi_gro_receive+0x28f/0x330 [ 48.751709][ C1] receive_buf+0x284/0x30b0 [ 48.756193][ C1] ? __tsan_write8+0x32/0x40 [ 48.760858][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 48.766294][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.771901][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.777522][ C1] virtnet_poll+0x436/0x7d0 [ 48.782022][ C1] net_rx_action+0x3ae/0xa90 [ 48.786598][ C1] __do_softirq+0x115/0x33f [ 48.791081][ C1] ? takeover_tasklets+0x250/0x250 [ 48.796171][ C1] run_ksoftirqd+0x46/0x60 [ 48.800568][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 48.805484][ C1] kthread+0x1d4/0x200 [ 48.809543][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 48.815497][ C1] ? kthread_stop+0x2d0/0x2d0 [ 48.820159][ C1] ret_from_fork+0x1f/0x30 [ 48.825917][ C1] Kernel Offset: disabled [ 48.830241][ C1] Rebooting in 86400 seconds..