[Gluster-devel] how to debug glusterfs NFS with gdb

[Niels de Vos]

On Mon, Jul 08, 2013 at 10:28:25PM +0200, Heiko L. wrote:
> 
> Hallo
> 
> I tried debug glusterfs-nfs.
> On [15] written:
> 
>  bash# make CFLAGS="-g -O0" && make install
>  address at hidden sbin]# gdb glusterfs
>  (gdb) run --no-daemon -f
> 
> 
> 
> My attempt:
> - compile glusterfs like [16] with:
>  # gfsver="3.3.2qa4"
>  # withdebug=1
> 
> 
> 
> # ps axu | grep glust
> root      4402  3.9  1.2 332256 44260 ?        Ssl  20:14   1:05 /usr/local/sbin/glusterfsd -s localhost --volfile-id
> gv4.elke2.mnt-sda6-brick4 -p /var/lib/glusterd/vols/gv4/run/elke2-mnt-sda6-brick4.pid -S
> /var/run/c8d4954e69dc941098f47378216e8c17.socket --brick-name /mnt/sda6/brick4 -l
> /usr/local/var/log/glusterfs/bricks/mnt-sda6-brick4.log --xlator-option
> *-posix.glusterd-uuid=c4e6a1c5-5f43-49ff-902b-2670c19ddf4a --brick-port 24011 --xlator-option gv4-server.listen-port=24011
> root      4985  0.0  0.0  97592   364 ?        Ssl  20:14   0:00 /usr/local/sbin/glusterd -p /var/run/glusterd.pid
> root      5023  2.1 45.1 2913148 1589528 ?     Ssl  20:14   0:35 /usr/local/sbin/glusterfs -s localhost --volfile-id
> gluster/nfs -p /var/lib/glusterd/nfs/run/nfs.pid -l /usr/local/var/log/glusterfs/nfs.log -S
> /var/run/a818bbe0663cda0710f46210434aac9a.socket
> root      5029  0.0  0.0 164636   280 ?        Ssl  20:14   0:00 /usr/local/sbin/glusterfs -s localhost --volfile-id
> gluster/glustershd -p /var/lib/glusterd/glustershd/run/glustershd.pid -l /usr/local/var/log/glusterfs/glustershd.log -S
> /var/run/0c2d6fe365ee87cbc79db2015abadd21.socket --xlator-option *replicate*.node-uuid=c4e6a1c5-5f43-49ff-902b-2670c19ddf4a
> root      7714  0.0  0.0   6308   596 pts/0    S+   20:42   0:00 grep glust
> 
> #### stop all active processes
> # /etc/init.d/glusterfs stop
> 
> # gdb /usr/local/sbin/glusterfs
> 
> (gdb) run --no-daemon -f
> Starting program: /usr/local/sbin/glusterfs --no-daemon -f
> warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> /usr/local/sbin/glusterfs: option requires an argument -- 'f'
> Try `glusterfs --help' or `glusterfs --usage' for more information.
> [Inferior 1 (process 10714) exited with code 0100]
> 
> (gdb) run --no-daemon
> Starting program: /usr/local/sbin/glusterfs --no-daemon
> warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> [2013-07-08 20:04:57.094108] C [glusterfsd.c:1224:parse_cmdline] 0-glusterfs: ERROR: parsing the volfile failed (No such file
> or directory)
> 
> USAGE: /usr/local/sbin/glusterfs [options] [mountpoint]
> [Inferior 1 (process 10750) exited with code 0377]
> 
> 
> 
> How should the correct command look like?

What I tend to do is:

1. check for the PID and complete arguments to pass

    # ps ax | grep glusterfs/nfs
    root      5023  2.1 45.1 2913148 1589528 ?     Ssl  20:14   0:35 \
      /usr/local/sbin/glusterfs -s localhost --volfile-id  gluster/nfs \
      -p /var/lib/glusterd/nfs/run/nfs.pid \
      -l /usr/local/var/log/glusterfs/nfs.log \
      -S /var/run/a818bbe0663cda0710f46210434aac9a.socket

2. kill the glusterfs/nfs process

    # kill 5023

3. run the process through gdb (add --no-daemon)

    # gdb /usr/local/sbin/glusterfs
    (gdb) run --no-daemon -s localhost --volfile-id  gluster/nfs \
      -p /var/lib/glusterd/nfs/run/nfs.pid \
      -l /usr/local/var/log/glusterfs/nfs.log \
      -S /var/run/a818bbe0663cda0710f46210434aac9a.socket


Cheers,
Niels


> 
> Regards Heiko
> 
> 
> 
> [15] http://lists.gnu.org/archive/html/gluster-devel/2008-09/msg00004.html
>   [Gluster-devel] how to debug glusterfs with gdb?
> 
> [16] http://www2.fh-lausitz.de/launic/comp/net/glusterfs/130705.lnx.make_glusterfs_howto.html
> 
> 
> 
> 
> 
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-- 
Niels de Vos
Sr. Software Maintenance Engineer
Support Engineering Group
Red Hat Global Support Services