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Bug 1022731 - rpc.gssd: segfault at 0 error 4 in [NEEDINFO]
rpc.gssd: segfault at 0 error 4 in
Product: Fedora
Classification: Fedora
Component: nfs-utils (Show other bugs)
All Linux
unspecified Severity low
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Assigned To: Steve Dickson
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2013-10-23 17:10 EDT by Orion Poplawski
Modified: 2015-02-17 12:47 EST (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2015-02-17 12:47:49 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
steved: needinfo?

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Description Orion Poplawski 2013-10-23 17:10:01 EDT
Description of problem:

I'm seeing these occaisionally:

lynx/var/log/messages-20130917:Sep 11 15:58:26 lynx kernel: [  657.517986] rpc.gssd[297]: segfault at 0 ip b741262a sp bff26bcc error 4 in[b7395000+1b8000]
orca/var/log/messages-20131014:Oct  9 16:23:21 orca kernel: [  535.072792] rpc.gssd[285]: segfault at 0 ip b74a672a sp bfac49ac error 4 in[b7429000+1b8000]
pacas/var/log/messages:Oct 23 14:08:11 pacas kernel: [  258.369765] rpc.gssd[364]: segfault at 0 ip 00007fe4ae47c32a sp 00007fffe8a00348 error 4 in[7fe4ae340000+1b4000]
vmf20/var/log/messages-20130922:Sep 16 16:09:04 vmf20 kernel: [ 2481.268610] rpc.gssd[255]: segfault at 0 ip 00007fe1086a8bca sp 00007fff43f0f378 error 4 in[7fe108624000+1b4000]

Note that I'm not making use of kerberos at the moment so it's not that big of a deal (and perhaps that is the cause).  I probably should just disable nfs-secure.service.  But it probably also shouldn't segfault.  I also see:

[  258.369765] rpc.gssd[364]: segfault at 0 ip 00007fe4ae47c32a sp 00007fffe8a00348 error 4 in[7fe4ae340000+1b4000]
[  258.370028] NFS: nfs4_discover_server_trunking unhandled error -32. Exiting with error EIO
[  788.168996] RPC: AUTH_GSS upcall timed out.
Please check user daemon is running.

Version-Release number of selected component (if applicable):
Comment 1 Orion Poplawski 2013-10-28 11:36:00 EDT
Disabling nfs-secure seems to be causing problems with automount not being able to mount directories the first time.
Comment 2 Brian J. Murrell 2014-06-25 12:30:38 EDT
I'm seeing this also every time I log in after a reboot.  But I am using kerberos so this is a pretty big deal.

After logging in I have to issue a:

# systemctl restart rpcgssd

to get a functioning rpc.gssd.

I would simply have just filed the abrt report but after generating the stack trace it reports that it's un-usable and refused to go any further.

Opening the abrt working directory and trying to get a stack trace from the corefile manually (after installing the debuginfos) yields:

$ gdb /usr/sbin/rpc.gssd coredump
GNU gdb (GDB) Fedora 7.7.1-13.fc20
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
Find the GDB manual and other documentation resources online at:
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/sbin/rpc.gssd...Reading symbols from /usr/lib/debug/usr/sbin/rpc.gssd.debug...done.
[New LWP 2472]
Core was generated by `/usr/sbin/rpc.gssd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f009766fbfa in ?? ()
(gdb) where
#0  0x00007f009766fbfa in ?? ()
#1  0x00007f0098760fdd in ?? ()
#2  0x0000000000000000 in ?? ()

So yeah, not very useful.  var_log_messages from the abrt report:

$ cat var_log_messages 
[System Logs]:
Jun 11 07:58:36 kernel: rpc.gssd[2472]: segfault at 0 ip 00007f009766fbfa sp 00007fffa85cb7f8 error 4 in[7f00975eb000+1b4000]
Jun 11 07:58:37 abrt-hook-ccpp[2473]: Saved core dump of pid 2472 (/usr/sbin/rpc.gssd) to /var/tmp/abrt/ccpp-2014-06-11-07:58:36-2472 (733184 bytes)
Jun 11 07:58:37 rpc.gssd[1285]: WARNING: forked child was killed with signal 11
[User Logs]:
Jun 11 07:58:37 abrt-hook-ccpp[2473]: Saved core dump of pid 2472 (/usr/sbin/rpc.gssd) to /var/tmp/abrt/ccpp-2014-06-11-07:58:36-2472 (733184 bytes)
Jun 11 07:58:37 rpc.gssd[1285]: WARNING: forked child was killed with signal 11

Anything else I can do to gather any useful information?
Comment 3 J. Bruce Fields 2014-06-26 14:22:14 EDT
Off the top of my head:

Might be worth running rpc.gssd with -vvv to get more logging.

There's also a -F that will let you run it by hand in the foreground to make it easier to strace or debug.

Is this still on Fedora 19?
Comment 4 Fedora End Of Life 2015-01-09 15:21:03 EST
This message is a notice that Fedora 19 is now at end of life. Fedora 
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Comment 5 Fedora End Of Life 2015-02-17 12:47:49 EST
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
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