Public bug reported:
On ubuntu trusty 14.04.4 in multipath-tools version 0.4.9-3ubuntu7.14
there is bug in multipathd on shutdown.
The code will access pathvec pointer which is a valid address:
Reading symbols from /sbin/multipathd...Reading symbols from
/usr/lib/debug//sbin/multipathd...done.
done.
[New LWP 41631]
[New LWP 41584]
[New LWP 41633]
[New LWP 41632]
[New LWP 41582]
[New LWP 41583]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/sbin/multipathd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00000000004075db in checkerloop (ap=0x1b81040) at main.c:1150
1150 vector_foreach_slot (vecs->pathvec, pp, i) {
(gdb) list
1145 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1146 lock(vecs->lock);
1147 condlog(4, "tick");
1148
1149 if (vecs->pathvec) {
1150 vector_foreach_slot (vecs->pathvec, pp, i) {
1151 check_path(vecs, pp);
1152 }
1153 }
1154 if (vecs->mpvec) {
Pathvec is a valid pointer:
(gdb) p vecs->pathvec
$1 = (vector) 0x1b81280
But the contents of the structure are just garbage:
(gdb) p *vecs->pathvec
$2 = {allocated = 1651076143, slot = 0x756e696c2d34365f}
(gdb)
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Assignee: Dragan S. (dragan-s)
Status: In Progress
** Tags: sts trusty
** Changed in: multipath-tools (Ubuntu)
Assignee: (unassigned) => Dragan S. (dragan-s)
** Changed in: multipath-tools (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1616213
Title:
Core dump on multipathd shutdown - trusty 14.04.4
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