[ 36.159020][ T26] audit: type=1800 audit(1571793597.202:25): pid=7014 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.188060][ T26] audit: type=1800 audit(1571793597.202:26): pid=7014 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.216684][ T26] audit: type=1800 audit(1571793597.202:27): pid=7014 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. [ 36.803963][ T7077] sshd (7077) 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 '10.128.1.35' (ECDSA) to the list of known hosts. 2019/10/23 01:20:08 fuzzer started 2019/10/23 01:20:09 dialing manager at 10.128.0.105:33369 2019/10/23 01:20:09 syscalls: 2524 2019/10/23 01:20:09 code coverage: enabled 2019/10/23 01:20:09 comparison tracing: enabled 2019/10/23 01:20:09 extra coverage: extra coverage is not supported by the kernel 2019/10/23 01:20:09 setuid sandbox: enabled 2019/10/23 01:20:09 namespace sandbox: enabled 2019/10/23 01:20:09 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 01:20:09 fault injection: enabled 2019/10/23 01:20:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 01:20:09 net packet injection: enabled 2019/10/23 01:20:09 net device setup: enabled 2019/10/23 01:20:09 concurrency sanitizer: enabled syzkaller login: [ 48.880486][ C0] ================================================================== [ 48.888730][ C0] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 48.897199][ C0] [ 48.899518][ C0] write to 0xffff8881260ef108 of 4 bytes by task 7173 on cpu 1: [ 48.907165][ C0] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.912582][ C0] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.918216][ C0] nf_conntrack_in+0x410/0xa80 [ 48.923172][ C0] ipv4_conntrack_local+0xbe/0x130 [ 48.928479][ C0] nf_hook_slow+0x83/0x160 [ 48.932890][ C0] __ip_local_out+0x1f7/0x2b0 [ 48.937561][ C0] ip_local_out+0x31/0x90 [ 48.941890][ C0] __ip_queue_xmit+0x3a8/0xa40 [ 48.946640][ C0] ip_queue_xmit+0x45/0x60 [ 48.951060][ C0] __tcp_transmit_skb+0xe81/0x1d60 [ 48.956582][ C0] __tcp_send_ack+0x246/0x300 [ 48.961316][ C0] tcp_send_ack+0x34/0x40 [ 48.965643][ C0] tcp_cleanup_rbuf+0x130/0x360 [ 48.970473][ C0] tcp_recvmsg+0x633/0x1a30 [ 48.974956][ C0] [ 48.977274][ C0] read to 0xffff8881260ef108 of 4 bytes by interrupt on cpu 0: [ 48.984813][ C0] __nf_conntrack_find_get+0x284/0x880 [ 48.990268][ C0] nf_conntrack_in+0x2ef/0xa80 [ 48.995632][ C0] ipv4_conntrack_in+0x27/0x40 [ 49.000514][ C0] nf_hook_slow+0x83/0x160 [ 49.004918][ C0] ip_rcv+0x12f/0x1a0 [ 49.008885][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.014583][ C0] __netif_receive_skb+0x37/0xf0 [ 49.019498][ C0] netif_receive_skb_internal+0x59/0x190 [ 49.025494][ C0] napi_gro_complete+0x114/0x1d0 [ 49.030845][ C0] dev_gro_receive+0xaf6/0x1190 [ 49.035680][ C0] napi_gro_receive+0x7c/0x330 [ 49.040448][ C0] receive_buf+0x284/0x30b0 [ 49.045386][ C0] virtnet_poll+0x436/0x7d0 [ 49.049872][ C0] [ 49.052397][ C0] Reported by Kernel Concurrency Sanitizer on: [ 49.058991][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.066074][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.076171][ C0] ================================================================== [ 49.084229][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 49.090977][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.098064][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.108109][ C0] Call Trace: [ 49.111375][ C0] [ 49.114340][ C0] dump_stack+0xf5/0x159 [ 49.118571][ C0] panic+0x210/0x640 [ 49.122545][ C0] ? napi_gro_complete+0x114/0x1d0 [ 49.127664][ C0] ? vprintk_func+0x8d/0x140 [ 49.132746][ C0] kcsan_report.cold+0xc/0x10 [ 49.137410][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.142937][ C0] __tsan_read4+0x2c/0x30 [ 49.147256][ C0] __nf_conntrack_find_get+0x284/0x880 [ 49.152705][ C0] ? __tsan_write2+0x32/0x40 [ 49.157284][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.163251][ C0] nf_conntrack_in+0x2ef/0xa80 [ 49.168011][ C0] ipv4_conntrack_in+0x27/0x40 [ 49.173015][ C0] nf_hook_slow+0x83/0x160 [ 49.177543][ C0] ? nf_ct_bridge_unregister+0x70/0x70 [ 49.183010][ C0] ip_rcv+0x12f/0x1a0 [ 49.186980][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 49.191911][ C0] ? ip_local_deliver+0x210/0x210 [ 49.197043][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.202903][ C0] __netif_receive_skb+0x37/0xf0 [ 49.207834][ C0] netif_receive_skb_internal+0x59/0x190 [ 49.213456][ C0] napi_gro_complete+0x114/0x1d0 [ 49.218401][ C0] dev_gro_receive+0xaf6/0x1190 [ 49.223358][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.228984][ C0] napi_gro_receive+0x7c/0x330 [ 49.233729][ C0] receive_buf+0x284/0x30b0 [ 49.238212][ C0] ? __tsan_write8+0x32/0x40 [ 49.242788][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 49.248234][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.253840][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.259455][ C0] virtnet_poll+0x436/0x7d0 [ 49.264030][ C0] net_rx_action+0x3ae/0xa90 [ 49.268606][ C0] __do_softirq+0x115/0x33f [ 49.273127][ C0] irq_exit+0xbb/0xe0 [ 49.277096][ C0] do_IRQ+0xa6/0x180 [ 49.280983][ C0] common_interrupt+0xf/0xf [ 49.285473][ C0] [ 49.288404][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 49.293848][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d fc b2 4b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec b2 4b 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 72 12 a4 fc e8 6d 8e b8 fd 0f [ 49.313611][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda [ 49.322153][ C0] RAX: 0c49ba5e353f7fac RBX: ffffffff85a2b780 RCX: 000000000000006a [ 49.330119][ C0] RDX: 0000000000026160 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8 [ 49.338093][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf [ 49.346486][ C0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000 [ 49.354439][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000 [ 49.362410][ C0] ? default_idle+0x50/0x230 [ 49.367033][ C0] arch_cpu_idle+0x1f/0x30 [ 49.371432][ C0] default_idle_call+0x1e/0x40 [ 49.376225][ C0] do_idle+0x1af/0x280 [ 49.380278][ C0] cpu_startup_entry+0x1b/0x20 [ 49.385028][ C0] rest_init+0xec/0xf6 [ 49.389104][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 49.396712][ C0] arch_call_rest_init+0x17/0x37 [ 49.401653][ C0] start_kernel+0x838/0x85e [ 49.406143][ C0] x86_64_start_reservations+0x29/0x2b [ 49.411601][ C0] x86_64_start_kernel+0x72/0x76 [ 49.416550][ C0] secondary_startup_64+0xa4/0xb0 [ 49.423017][ C0] Kernel Offset: disabled [ 49.427345][ C0] Rebooting in 86400 seconds..