[Bug breakpoints/22921] breakpoint in PLT corrupts function argument in $rcx

["aburgess at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22921

--- Comment #5 from Andrew Burgess <aburgess at redhat dot com> ---
Created attachment 14677
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14677&action=edit
Minimal reproducer

Decompiled the shared library in the original reproducer, and created a new,
minimal example of this issue, this time in source only.

To use:

  tar -xf pr-22921.tar.xz
  cd pr-22921
  make
  make debug

The test should report FAILED.  Then:

  make run

The test, run outside GDB, should report PASSED.

I haven't completely discounted that this might be a program error, but if it
is, I can't see it yet.

Also, when run under GDB the cmd_apb.gdb script is used.  You'll notice inside
it this line:

  ##delete

which deletes all breakpoints.  if this line is un-commented then the test,
when run under GDB starts working again.  So it does appear that the very
presence of the software breakpoint causes the test to fail.  I've done no
additional debuggging of the issue so far.

-- 
You are receiving this mail because:
You are on the CC list for the bug.