Bug 187209

Summary:	rpc.svcgssd segfaults
Product:	[Fedora] Fedora	Reporter:	Kostas Georgiou <k.georgiou>
Component:	nfs-utils-lib	Assignee:	Steve Dickson <steved>
Status:	CLOSED NOTABUG	QA Contact:	Ben Levenson <benl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-03-30 23:29:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Kostas Georgiou 2006-03-29 08:27:19 UTC

After the update to FC5 (rawhide was fine) rpc.svcgssd dies at random times with
the following error (taken with OPTIONS="-v -r" in the init script):

rpc.svcgssd[13785]: leaving poll
rpc.svcgssd[13785]: handling null request
rpc.svcgssd[13785]:
rpc.svcgssd[13785]: sname = nfs/foo.domain@DOMAIN
kernel: rpc.svcgssd[13785]: segfault at 0000000000000000 rip 00002b55a8a76160
rsp 00007fffffcfd328 error 4

Comment 1 Kostas Georgiou 2006-03-30 22:46:07 UTC

It looks like nscd is causing it, here is the stack trace (no debuginfo yet
though, sorry). 

#0  0x00002aaaab865160 in strlen () from /lib64/libc.so.6
#1  0x00002aaaab8ec988 in __nscd_getgrouplist () from /lib64/libc.so.6
#2  0x00002aaaab8814e4 in internal_getgrouplist () from /lib64/libc.so.6
#3  0x00002aaaab881703 in getgrouplist () from /lib64/libc.so.6
#4  0x00002aaaaaddd19b in nss_gss_princ_to_grouplist () from
/usr/lib64/libnfsidmap.so.0
#5  0x0000555555557461 in main () from /usr/sbin/rpc.svcgssd

Disabling nscd cured the problem in both my servers.

Comment 2 Kostas Georgiou 2006-03-30 23:03:12 UTC

Here is the output with glibc-debuginfo installed. 
Should I reassign the bug to glibc?

(gdb) where
#0  0x00002aaaab865160 in ?? () from /lib64/libc.so.6
#1  0x00002aaaab8ec988 in __nscd_getgrouplist (user=0x0, group=0,
size=0x7fffffa0a7c0,
    groupsp=0x7fffffa0a7c8, limit=Variable "limit" is not available.
) at nscd_initgroups.c:40
#2  0x00002aaaab8814e4 in internal_getgrouplist (user=0x0, group=0,
size=0x7fffffa0a7c0,
    groupsp=0x7fffffa0a7c8, limit=-1) at initgroups.c:60
#3  0x00002aaaab881703 in getgrouplist (user=0x0, group=0, groups=0x7fffffa0a89c,
    ngroups=0x7fffffa0a898) at initgroups.c:158
#4  0x00002aaaaaddd19b in nss_gss_princ_to_grouplist () from
/usr/lib64/libnfsidmap.so.0
#5  0x0000555555557461 in main () from /usr/sbin/rpc.svcgssd

Comment 3 Kostas Georgiou 2006-03-30 23:29:03 UTC

Aha http://linux-nfs.org/pipermail/nfsv4/2006-March/003775.html

Reassigning to nfs-utils-lib.