[Bug corefiles/31294] gcores do not work in 32-bit arm targets

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

https://sourceware.org/bugzilla/show_bug.cgi?id=31294

Guinevere Larsen <blarsen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|backtrace                   |corefiles
            Summary|cant unwind                 |gcores do not work in
                   |__libc_do_syscall from      |32-bit arm targets
                   |gcore in arm 32 bits        |

--- Comment #1 from Guinevere Larsen <blarsen at redhat dot com> ---
The rest of gdb.threads/threadcrash.exp gcore section has even worse results.
The log for "thread apply all backtrace" is as follows:

thread apply all backtrace^M
^M
Thread 7 (LWP 776476):^M
#0  0xf7eadb04 in ?? ()^M
#1  0xf7f13a7e in ?? ()^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M
^M
Thread 6 (LWP 776475):^M
#0  0xf7eadb04 in ?? ()^M
#1  0xf7f13a7e in ?? ()^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M
^M
Thread 5 (LWP 776474):^M
#0  0xf7eadb04 in ?? ()^M
#1  0xf7f13a7e in ?? ()^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M
^M
Thread 4 (LWP 776473):^M
#0  do_spin_task (location=SIGNAL_ALT_STACK) at
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gdb.git~master/gdb/testsuite/gdb.threads/threadcrash.c:139^M
#1  0x00400a5e in signal_handler (signo=10) at
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gdb.git~master/gdb/testsuite/gdb.threads/threadcrash.c:241^M
#2  <signal handler called>^M
#3  0xf7eadb06 in ?? ()^M
#4  0xf7eed292 in ?? ()^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M
^M
Thread 3 (LWP 776472):^M
#0  do_spin_task (location=SIGNAL_HANDLER) at
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gdb.git~master/gdb/testsuite/gdb.threads/threadcrash.c:139^M
#1  0x00400a5e in signal_handler (signo=10) at
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gdb.git~master/gdb/testsuite/gdb.threads/threadcrash.c:241^M
#2  <signal handler called>^M
#3  0xf7eadb06 in ?? ()^M
#4  0xf7eed292 in ?? ()^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M

Seems that either the writing or reading of gcores is thoroughly broken.

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