[dm-devel] multipathd segfault

[Hannes Reinecke]

David Strand wrote:
> I am getting a multipathd segfault when I have more than 26 devices,
> and the device names become 4 characters. (i.e. /dev/sdz is consumed
> and the next device is /dev/sdaa).
> 
> I was trying to hook gdb to a core dump, but it keeps complaining that
> it needs device-mapper-libs-debuginfo, which I can not find. Can
> anyone point me to this?
> 
> I built multipathd with -g turned on and did not strip it. Here is the
> last few lines of output when I run it as multipathd -v9 -d:
> 
> Jul 04 05:01:26 | alpa-0x000080: discover
> Jul 04 05:01:26 | libdevmapper: ioctl/libdm-iface.c(1606): dm table
> alpa-0x000080  NF   [16384]
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = 65:160, len = 6
> Jul 04 05:01:26 | *word = 1000, len = 4
> Jul 04 05:01:26 | libdevmapper: ioctl/libdm-iface.c(1606): dm status
> alpa-0x000080  NF   [16384]
> Jul 04 05:01:26 | *word = 2, len = 1
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = E, len = 1
> Jul 04 05:01:26 | *word = 1, len = 1
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | *word = A, len = 1
> Jul 04 05:01:26 | *word = 0, len = 1
> Jul 04 05:01:26 | alpa-0x000080: rr_weight = 1 (internal default)
> Jul 04 05:01:26 | alpa-0x000080: pgfailback = -2 (config file default)
> Jul 04 05:01:26 | alpa-0x000080: no_path_retry = 3 (config file default)
> Jul 04 05:01:26 | libdevmapper: ioctl/libdm-iface.c(1606): dm message
> alpa-0x000080  NF  queue_if_no_path
>  [16384]
> Jul 04 05:01:26 | pg_timeout = NONE (internal default)
> Jul 04 05:01:26 | alpa-0x000080: event checker started
> Jul 04 05:01:26 | sdaa path added to devmap alpa-0x000080
> Jul 04 05:01:26 | discard event on /block/sdaa/sdaa1
> Segmentation fault
> 
Oh, that one.

Fixed by the attached path.

Christophe, care to apply?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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