[Crash-utility] crash problems with linux-4.5

[Dave Anderson]

----- Original Message -----
> Hi,
> 
> Just forcing a crash dump via 'echo c > /proc/sysrq-trigger' results in a crash
> dump that has no tasks saved.  I see _lots_ of these errors when loading the
> dump with the latest crash from the git repo:
> 
> crash: page excluded: kernel virtual address: ffff88103c5a9000  type: "fill_task_struct"
> WARNING: active task ffff881078a04340 on cpu 3 not found in PID hash
> 
> Then nothing is in the dump:
> 
> crash> ps
>    PID    PPID  CPU       TASK        ST  %MEM     VSZ    RSS  COMM
> >     0      0   0  ffffffff81c0f4c0  RU   0.0       0      0  [swapper/0]
> crash>
> 
> Any ideas?
> 
> I'm using top-o-tree from Dave's git repo
> https://github.com/crash-utility/crash.git:
> 
> commit 04ab5c560a58246e782509d99214afcaf8462b4c
> Author: Dave Anderson <anderson at redhat.com>
> Date:   Tue Mar 1 16:16:48 2016 -0500
> 
>     Put 2016 copyright in initial banner.
> 
> 
> Thanks,
> 
> Steve.

If you have configured kdump to use makedumpfile -d31, it is probably this:

  [Crash-utility] makedumpfile: 4.5 kernel commit breaks page filtering
  https://www.redhat.com/archives/crash-utility/2016-February/msg00009.html

> PS: I'm not on the crash-utility list, so please include my email in any
> replies.

PS: if you're using crash on bleeding edge kernels, you might want to join
the list, at least in digest mode.

Dave