[Crash-utility] [ANNOUNCE] gcore extension module update

[Dave Anderson]

----- Original Message -----
> This update introduces a support of 32-bit user-space tasks on X86_64, 
> and fixes a number of bugs.
> 
> This time RHEL5.6 has newly been tested. Support range for 32-bit
> tasks on X86_64 is just the same as for ordinary 64-bit tasks. In
> summary, the current support range is as follows:
> 
> Architecture: X86_64 including 32-bit tasks and X86
> Versions: RHEL4.8, RHEL5.5, RHEL5.6, RHEL6.0 and vanilla 2.6.36.
> 
> Note: there is the issue that register restoration for callee-saved
> registers doesn't work well on RHEL6.0 and recent kernels that are
> built with recent tools. I'm going to address this issue but it's
> still under investigation. I'd stress here that the register values
> restored is enough for back tracing.
> 
> Also any comment, suggestion and report is welcome.

The extensions page has been updated to reference the files in
this package:

  http://people.redhat.com/anderson/extensions.html

Thanks,
  Dave


> ChangeLog:
> 
> - Support 32-bit user-space tasks on X86_64. Created are 32-bit ELF
> core files containing the same kinds of note information as on X86.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in calculation of detecting whether NT_IOPERM is available
> or not. Without this fix, NT_IOPERM is never included in a core
> file.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in a processing of writing note information. Without this
> patch, a length of ELF note section recorded in PT_NOTE program
> header entry could be different from an actual size of written data,
> and tools such as gdb and binutils recognize it as an invalid ELF
> file.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in resuming an original task context. Without this patch,
> gcore fails to let crash's state resume back to the original context
> when specifying a different task context as a target from a current
> one.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in getting register values from
> NT_PRSTATUS. DISKDUMP/NETDUMP saves register values for a panic task
> only, while KDUMP saves NT_PRSTATUS for all active tasks. Without
> this patch, dumping processing fails if a non-panic active task is
> specified and analyzed kernel dumpfile contains NT_PRSTATUS for
> panic task only. Although best way is to check the number of
> NT_PRSTATUS contained in a given kernel dumpfile, this fix
> temporarilly only checks in what formats the analying kernel dump
> is.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in restoring segment register DS. Without this patch, the
> value of DS segment register in NT_PRSTATUS is always 0 if a dump
> target task is a sleep task.
> (d.hatayama at jp.fujitsu.com)
> 
> - Fix a bug in restoring segment registers. Field size for segment
> registers in kernel is 2 bytes, while field size in note information
> is 8 bytes. Without this patch, high 6-bytes has an arbitrary value
> in note information. Low 2-bytes remains the same.
> (d.hatayama at jp.fujitsu.com)
> 
> Thanks.
> HATAYAMA Daisuke
> 
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