Re: RH 7 nfs-utils update causes segfault

[Mark Valites <mvalites@buffalo.edu>]

On 03/07/2016 02:49 PM, Benjamin Coddington wrote:

> Best bet would be to attache a debugger to rpc.gssd and get a stack trace of
> it when it crashes.  That will give us something to work from.
>
> You can do that with gdb -p <pid of gssd>.  Something like `gdb -p $(pidof
> rpc.gssd)` will work -- then type "continue" to let the process continue to
> run.  When it fails you can enter "bt" to emit a back trace.  That
> information would be very helpful.

Thank you for the gdb usage suggestion - I needed it...

Here's the output:
 
 
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
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".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 492
Reading symbols from /usr/sbin/rpc.gssd...Reading symbols from 
/usr/lib/debug/usr/sbin/rpc.gssd.debug...done.
done.
Reading symbols from /lib64/libtirpc.so.1...Reading symbols from 
/lib64/libtirpc.so.1...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/libtirpc.so.1
Reading symbols from /lib64/libgssapi_krb5.so.2...Reading symbols from 
/usr/lib/debug/usr/lib64/libgssapi_krb5.so.2.2.debug...done.
done.
Loaded symbols for /lib64/libgssapi_krb5.so.2
Reading symbols from /lib64/libkrb5.so.3...Reading symbols from 
/usr/lib/debug/usr/lib64/libkrb5.so.3.3.debug...done.
done.
Loaded symbols for /lib64/libkrb5.so.3
Reading symbols from /lib64/libk5crypto.so.3...Reading symbols from 
/usr/lib/debug/usr/lib64/libk5crypto.so.3.1.debug...done.
done.
Loaded symbols for /lib64/libk5crypto.so.3
Reading symbols from /lib64/libcom_err.so.2...Reading symbols from 
/usr/lib/debug/usr/lib64/libcom_err.so.2.1.debug...done.
done.
Loaded symbols for /lib64/libcom_err.so.2
Reading symbols from /lib64/libc.so.6...Reading symbols from 
/usr/lib/debug/usr/lib64/libc-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/libnsl.so.1...Reading symbols from 
/usr/lib/debug/usr/lib64/libnsl-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libnsl.so.1
Reading symbols from /lib64/libpthread.so.0...Reading symbols from 
/usr/lib/debug/usr/lib64/libpthread-2.17.so.debug...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libkrb5support.so.0...Reading symbols from 
/usr/lib/debug/usr/lib64/libkrb5support.so.0.1.debug...done.
done.
Loaded symbols for /lib64/libkrb5support.so.0
Reading symbols from /lib64/libdl.so.2...Reading symbols from 
/usr/lib/debug/usr/lib64/libdl-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libkeyutils.so.1...Reading symbols from 
/usr/lib/debug/usr/lib64/libkeyutils.so.1.5.debug...done.
done.
Loaded symbols for /lib64/libkeyutils.so.1
Reading symbols from /lib64/libresolv.so.2...Reading symbols from 
/usr/lib/debug/usr/lib64/libresolv-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from 
/usr/lib/debug/usr/lib64/ld-2.17.so.debug...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libselinux.so.1...Reading symbols from 
/usr/lib/debug/usr/lib64/libselinux.so.1.debug...done.
done.
Loaded symbols for /lib64/libselinux.so.1
Reading symbols from /lib64/libpcre.so.1...Reading symbols from 
/lib64/libpcre.so.1...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/libpcre.so.1
Reading symbols from /lib64/liblzma.so.5...Reading symbols from 
/lib64/liblzma.so.5...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/liblzma.so.5
Reading symbols from /usr/lib64/gssproxy/proxymech.so...Reading symbols 
from /usr/lib/debug/usr/lib64/gssproxy/proxymech.so.debug...done.
done.
Loaded symbols for /usr/lib64/gssproxy/proxymech.so
Reading symbols from /lib64/libgssrpc.so.4...Reading symbols from 
/usr/lib/debug/usr/lib64/libgssrpc.so.4.2.debug...done.
done.
Loaded symbols for /lib64/libgssrpc.so.4
0x00007f4cd7ba4be9 in __GI_ppoll (fds=fds@entry=0x7f4cd9dc8b50, 
nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, 
sigmask=sigmask@entry=0x7ffdd6f44770)
     at ../sysdeps/unix/sysv/linux/ppoll.c:51
51          result = INLINE_SYSCALL (ppoll, 5, fds, nfds, timeout, 
sigmask, _NSIG / 8);
Missing separate debuginfos, use: debuginfo-install 
libtirpc-0.2.4-0.6.el7.x86_64 pcre-8.32-15.el7.x86_64 
xz-libs-5.1.2-12alpha.el7.x86_64
(gdb) continue
Continuing.

Program received signal SIG37, Real-time event 37.
0x00007f4cd7ba4be9 in __GI_ppoll (fds=fds@entry=0x7f4cd9dc8b50, 
nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, 
sigmask=sigmask@entry=0x7ffdd6f44770)
     at ../sysdeps/unix/sysv/linux/ppoll.c:51
51          result = INLINE_SYSCALL (ppoll, 5, fds, nfds, timeout, 
sigmask, _NSIG / 8);
(gdb) bt
#0  0x00007f4cd7ba4be9 in __GI_ppoll (fds=fds@entry=0x7f4cd9dc8b50, 
nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, 
sigmask=sigmask@entry=0x7ffdd6f44770)
     at ../sysdeps/unix/sysv/linux/ppoll.c:51
#1  0x00007f4cd8c30587 in ppoll (__ss=0x7ffdd6f44770, __timeout=0x0, 
__nfds=1024, __fds=0x7f4cd9dc8b50) at /usr/include/bits/poll2.h:77
#2  gssd_poll (nfds=1024, fds=0x7f4cd9dc8b50) at gssd_main_loop.c:194
#3  gssd_run () at gssd_main_loop.c:258
#4  0x00007f4cd8c2f11a in main (argc=<optimized out>, 
argv=0x7ffdd6f449d8) at gssd.c:216