[ovs-discuss] intermittent ovs-vswitchd segfault

[Numan Siddique]

Hi,

I am seeing intermittent segfault's in ovs-vswitchd. We have like 20
compute nodes and noticed the crash in 4 or 5 nodes. Seems to me the crash
is seen when the system is idle for a long time (as I noticed over the
weekend)

We are using master of ovs (with the latest commit id 92043ab8ffd4)

Below is the dmesg and the backtrace of the core file

--------
[297752.801094] revalidator239[2308]: segfault at 0 ip 00007f2a8d966da3 sp
00007f2a28ff6c58 error 4 in ovs-vswitchd[7f2a8d8ef000+1ea000]
------------


[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `ovs-vswitchd unix:/var/run/openvswitch/db.sock
-vconsole:emer -vsyslog:err -vfi'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fe969b13da3 in cmap_replace__ ()
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-157.el7_3.1.x86_64 keyutils-libs-1.5.8-3.el7.x86_64
krb5-libs-1.14.1-27.el7_3.x86_64 libcap-ng-0.7.5-4.el7.x86_64
libcom_err-1.42.9-9.el7.x86_64 libselinux-2.5-6.el7.x86_64
openssl-libs-1.0.1e-60.el7.x86_64 pcre-8.32-15.el7_2.1.x86_64
zlib-1.2.7-17.el7.x86_64
(gdb) br
Breakpoint 1 at 0x7fe969b13da3
(gdb) bt
#0  0x00007fe969b13da3 in cmap_replace__ ()
#1  0x00007fe969b14491 in cmap_replace ()
#2  0x00007fe969aee9ff in ukey_delete ()
#3  0x00007fe969aefd42 in revalidator_sweep__ ()
#4  0x00007fe969af1bad in udpif_revalidator ()
#5  0x00007fe969b8b2a6 in ovsthread_wrapper ()
#6  0x00007fe968e07dc5 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fe96862c73d in clone () from /lib64/libc.so.6

Thanks
Numan
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