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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 11-26-2007, 07:40 PM
"S. J. van Harmelen"
 
Default Possible bug in multipathd (getting a segfault)

On Tue, 2007-11-20 at 12:15 +0100, Tore Anderson wrote:
> * S. J. van Harmelen
>
> > I guess I don't have to do that as I compiled the multipath-tools
> > myself?
>
> Then you should have the debugging symbols in place, yes.
>
> > I did compile them when running the 2.6.22.2 kernel though. Should I
> > recompile them when running the 2.6.23.1 kernel, or doesn't that
> > matter?
>
> Doesn't matter.
>
> > Oke, the segfault happens right at the start (and only at the start),
> > so that shouldn't be a problem. But I have to stop the running
> > mulipathd and that seems like a problem. This machine is running in
> > production
> >
> > So that will have to wait until I get a maintance window I guess...
>
> Stopping multipathd isn't problematic. It is only responsible for
> periodically testing paths to pre-emptively fail non-active paths or
> re-instate paths that has been failed by the kernel's dm-multipath layer.
>
> If everything is running stable with all paths alive and well,
> restarting multipathd is nothing to worry about.

I tried it, but it doesn't give me a core dump. It only shows one line
in syslog for each time that I start multipathd. Multipathd keeps
running with no noticeable errors though.

I'm running the system with a 2.6.23.8 kernel and it shows this error
one time per start of multipathd:

kernel: multipathd[2303]: segfault at 000000000000000a rip
00002baa8765f94f rsp 00007fff23b8e370 error 4
kernel: multipathd[3742]: segfault at 000000000000000a rip
00002b09ff82394f rsp 00007fffab9ca130 error 4
kernel: multipathd[4103]: segfault at 000000000000000a rip
00002adefdbe894f rsp 00007fffad604d90 error 4

Also I noticed that I get the "DELL ,Universal Xpor" in my multipath
-ll output. Didn't get that before. Is that something to look at?

root@storage:~# multipath -ll
360019b9000d7e1100000000000000000dm-5 DELL ,Universal Xpor
[size=20M][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][enabled]
\_ 1:0:0:31 sdf 8:80 [active][ready]
backup (360019b9000d7e1100000444b46be82c4) dm-2 DELL ,MD3000
[size=200G][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][active]
\_ 1:0:1:2 sdi 8:128 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:2 sdd 8:48 [active][ghost]
xen (360019b9000d7e11000004485473faa94) dm-1 DELL ,MD3000
[size=200G][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][enabled]
\_ 1:0:0:3 sde 8:64 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:1:3 sdj 8:144 [active][ghost]
360019b9000d7ddab0000000000000000dm-0 DELL ,Universal Xpor
[size=20M][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][enabled]
\_ 1:0:1:31 sdk 8:160 [active][ready]
vmware (360019b9000d7e1100000444846be81b6) dm-4 DELL ,MD3000
[size=200G][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][enabled]
\_ 1:0:0:0 sdb 8:16 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:1:0 sdg 8:96 [active][ghost]
data (360019b9000d7ddab0000493846be81e5) dm-3 DELL ,MD3000
[size=200G][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][active]
\_ 1:0:1:1 sdh 8:112 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:1 sdc 8:32 [active][ghost]

Regards,

Sander

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