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Re: gcc/testsuite/go/index0-out.x spinning


>> Looks like I spoke too soon.  It's hanging/spinning again.  Do you
>> have any suggestion for how I can help debug it?
>
> Send the spinning process a SIGQUIT.  It should crash with a stack
> backtrace showing what it is doing at that point.

I see a segfault in seemingly a random place, even with ulimit -s
unlimited, mostly in:

Program received signal SIGSEGV, Segmentation fault.
__generic_morestack (pframe_size=0x2aaaaefd9cc0,
old_stack=0x2aaaaefd9ce0, param_size=0) at
../../../git/gcc/libgcc/generic-morestack.c:558
558       current->old_stack = old_stack;
(gdb) bt
#0  __generic_morestack (pframe_size=0x2aaaaefd9cc0,
old_stack=0x2aaaaefd9ce0, param_size=0) at
../../../git/gcc/libgcc/generic-morestack.c:558
#1  0x00002aaaabae4fb8 in __morestack () at
../../../git/gcc/libgcc/config/i386/morestack.S:512
#2  0x00002aaaabadd1f8 in backtrace_get_view
(state=state@entry=0x2aaaafb7e000, descriptor=descriptor@entry=2,
offset=offset@entry=1760592,
    size=585728, error_callback=error_callback@entry=0x2aaaab557450
<error_callback>, data=data@entry=0x2aaaaefda6a0, view=0x2aaaaefd9fc0)
    at ../../../git/gcc/libbacktrace/mmapio.c:79
#3  0x00002aaaabadc660 in elf_add (state=state@entry=0x2aaaafb7e000,
    filename=filename@entry=0x7fffffffd8fc
"/home/uros/gcc-build/gcc/testsuite/go/index0-out.x",
descriptor=descriptor@entry=5,
    base_address=base_address@entry=0,
error_callback=error_callback@entry=0x2aaaab557450 <error_callback>,
data=data@entry=0x2aaaaefda6a0,
    fileline_fn=0x2aaaaefda238, found_sym=0x2aaaaefda230,
found_dwarf=0x2aaaaefda234, fileline_entry=0x0, exe=1, debuginfo=0,
    with_buildid_data=0x0, with_buildid_size=0) at
../../../git/gcc/libbacktrace/elf.c:3158
#4  0x00002aaaabadd041 in backtrace_initialize
(state=state@entry=0x2aaaafb7e000,
    filename=filename@entry=0x7fffffffd8fc
"/home/uros/gcc-build/gcc/testsuite/go/index0-out.x", descriptor=5,
    error_callback=error_callback@entry=0x2aaaab557450
<error_callback>, data=data@entry=0x2aaaaefda6a0,
    fileline_fn=fileline_fn@entry=0x2aaaaefda2d8) at
../../../git/gcc/libbacktrace/elf.c:3390

but sometimes in:

Program received signal SIGSEGV, Segmentation fault.
merge_dynamic_blocks (b=0x2, a=0x24) at
../../../git/gcc/libgcc/generic-morestack.c:420
420       for (pp = &a->next; *pp != NULL; pp = &(*pp)->next)
(gdb) bt
#0  merge_dynamic_blocks (b=0x2, a=0x24) at
../../../git/gcc/libgcc/generic-morestack.c:420
#1  __morestack_release_segments (free_dynamic=<optimized out>,
pp=<optimized out>) at ../../../git/gcc/libgcc/generic-morestack.c:455
#2  __generic_morestack (pframe_size=0x2aaaaefda150,
old_stack=0x2aaaaefda170, param_size=0) at
../../../git/gcc/libgcc/generic-morestack.c:546
#3  0x00002aaaabae4fb8 in __morestack () at
../../../git/gcc/libgcc/config/i386/morestack.S:512
#4  0x00002aaaabad75c1 in dwarf_lookup_pc
(state=state@entry=0x2aaaafb7e000, ddata=ddata@entry=0x2aaab18e5a18,
pc=<optimized out>,
    pc@entry=46912507311387, callback=callback@entry=0x2aaaab5570c0 <callback>,
    error_callback=error_callback@entry=0x2aaaab557450
<error_callback>, data=data@entry=0x2aaaaefda6a0, found=<optimized
out>)
    at ../../../git/gcc/libbacktrace/dwarf.c:3021

Uros.


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