Re: Unkillable and runaway processes

- re-compile the kernel with  DDB
- drop into DDB when the problem occurs
  ddb> ps
  ddb> show proc <rsync pid>
  ddb> thread <threadno of rsync pid (in output of show proc)>
  ddb> bt

Send the backtrace to pjd.

 -Kip


On 9/4/07, Kenneth Vestergaard Schmidt <kvs_at_pil.dk> wrote:
> Hello.
>
> Our ZFS testbed is experiencing some weird problems with rsync. We run a
> nightly backup of about 1.6 TB data (that's how much is stored, not how
> much is transferred), but after the initial sync I haven't been able to
> get the machine through one full cycle.
>
> After many hours of rsyncing data from 50+ machines, suddenly one
> rsync-process will hang, spinning on the CPU.
>
> It switches state between CPU0, CPU1, RUN and 'zfs:(&', but doesn't
> really do anything. It can't be killed, and you can't reboot the machine
> - it'll get past syncing disks, but won't shutdown or reboot.
>
> I can't do an 'ls' in the directory that rsync is running on - it'll
> just hang, too.
>
> The machine is running current from August 29th.
>
> I could use some pointers on what to do - is there some way I can debug
> this better, maybe give some better info?
>
> --
> Kenneth Schmidt
> pil.dk
>
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