Re: detection fails on isw hardware

 On 17/08/10 10:43 AM, Ian Stakenvicius, Aerobiology Research wrote:
> Hey all -- I've got a user that is having an issue with dmraid, the
> tool does seem to find the raid but is unable to create devnodes via
> devmapper.  He's tried .rc16 as well as CVS HEAD.  The following is
> what he sent me last:
>
> see http://bugs.gentoo.org/show_bug.cgi?id=307439  for the full
> dialogue..  any help would be appreciated.
>
> ------- Comment #10 from [email protected]  2010-07-27 20:27 0000 -------
> Well, the [CVS HEAD dmraid package] compiles fine, but unfortunatly, does not work.
>
> /dev/mapper is still empty.
>
> dmraid -ay hangs for a while, and finally spits out:
>
> Medusa mapper # dmraid -ay
> RAID set "isw_dagchgecca_BootEnBackup" already active
> RAID set "isw_dagchgecca_Data" already active
> ERROR:  Unable to register a device mapper event handler for device
> "isw_dagchgecca_BootEnBackup"
> ERROR:  Unable to register a device mapper event handler for device
> "isw_dagchgecca_Data"
> ERROR: opening "/dev/mapper/isw_dagchgecca_BootEnBackup"
> ERROR: opening "/dev/mapper/isw_dagchgecca_Data"
>
> Output from 
> "strace -f -s 1500 -t -o /tmp/strace dmraid -ay"
> is found here:
> http://sharesend.com/uuu3a
>
> (bzip2'ed, 141MB unpacked, bugzilla has a limit of 1MB for uploaded files, this
> is 2.3MB)
>
> line 1002460 shows the error.
> Just above (1002436) that you can see the child segfaulting after a munmap()
> call.
>
Here's some more info from the user:
-----------------------------------

Created an attachment (id=240367)
 --> (http://bugs.gentoo.org/attachment.cgi?id=240367&action=view) strace output dmeventd

After debugging some more, I'm pretty sure it's dmeventd which is segfaulting.

Testcase; start strace -s 1500 -f -t -o /tmp/dmeventd -- dmeventd -ddd -f in
one terminal, start dmraid -ay in another terminal.

dmeventd exits with "segfault".

strace output is attached (this one is tiny).

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