When i test conntrack, i catch a panic of ovs.
Core was generated by `ovs-vswitchd unix:/var/run/openvswitch/db.sock
-vconsole:emer -vsyslog:err -vfi'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00005605c5cd7553 in hmap_remove (node=0x7f734cde0218,
hmap=0x7f8178c7fd70) at ./include/openvswitch/hmap.h:287
287 while (*bucket != node) {
[Current thread is 1 (Thread 0x7f8178dccb00 (LWP 2024338))]
(gdb) bt
#0 0x00005605c5cd7553 in hmap_remove (node=0x7f734cde0218,
hmap=0x7f8178c7fd70) at ./include/openvswitch/hmap.h:287
#1 conn_clean (ct=ct@entry=0x7f8178c75d98, conn=0x7f734cde0170,
ctb=ctb@entry=0x7f8178c7fd40) at lib/conntrack.c:815
#2 0x00005605c5cdd66a in conntrack_flush (ct=0x7f8178c75d98, zone=0x0) at
lib/conntrack.c:2549
#3 0x00005605c5bc2b39 in ct_dpif_flush (dpif=0x5605c68a6430,
zone=zone@entry=0x0, tuple=tuple@entry=0x0) at lib/ct-dpif.c:140
#4 0x00005605c5ce17a0 in dpctl_flush_conntrack (argc=argc@entry=1,
argv=argv@entry=0x5605c697ec30, dpctl_p=dpctl_p@entry=0x7fffee718110) at
lib/dpctl.c:1388
#5 0x00005605c5cdeb78 in dpctl_unixctl_handler (conn=0x5605c6959ca0, argc=1,
argv=0x5605c697ec30, aux=0x5605c5ce1610 <dpctl_flush_conntrack>) at
lib/dpctl.c:2312
#6 0x00005605c5c806ea in process_command (request=<optimized out>,
conn=0x5605c6959ca0) at lib/unixctl.c:308
#7 run_connection (conn=0x5605c6959ca0) at lib/unixctl.c:342
#8 unixctl_server_run (server=0x5605c6868230) at lib/unixctl.c:393
#9 0x00005605c5804217 in main (argc=<optimized out>, argv=<optimized out>) at
vswitchd/ovs-vswitchd.c:126
Environment:
ovs-2.10.1
dpdk-18.0.2.2
How-To-Repeat:
1. configure ovs with snat aciton.
ovs-ofctl -O OpenFlow15 add-group $br_name "group_id=1, type=select,
selection_method=hash
bucket=bucket_id=1,weight:100,actions=ct(nat(src=172.16.1.1-172.255.255.255),commit,table=40)
"
2. syn-ddos send tcp syn packet to generate connection tracks.
3.
# ovs-appctl dpctl/ct-get-nconns
2063993
# ovs-appctl dpctl/flush-conntrack
2019-03-07T03:52:24Z|00001|unixctl|WARN|error communicating with
unix:/var/run/openvswitch/ovs-vswitchd.2024338.ctl: End of file
ovs-appctl: ovs-vswitchd: transaction error (End of file)
--
Thanks
Solomon
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