On Fri, Apr 5, 2013 at 8:31 AM, Prabhat Verma
<[email protected]>wrote:
> child's exit status 255
>
> FAILURE: detected 1 errors
> FAIL: test-ptrace
>
Could you run:
cd tests
./test-ptrace -c -t ./test-ptrace-misc # less verbose
./test-ptrace -v -c -t ./test-ptrace-misc
The -v flag should tell you where things are going wrong. For eg: on my
gcc-4.1.2/glibc-2.5 based system I get a failure in:
================
FAILURE: unw_step() returned -8 for ip=31f74094f8 (start ip=31f74094f8)
unwind failed with ret=-8
00000031f74094f8 _dl_lookup_symbol_x+0x3f8 (sp=00007fff06ab5f58)
proc=00000031f7409100-00000031f7409db7
handler=0 lsda=0
================
I then disassembled /lib64/ld-linux.so.2 to find the exact location:
_dl_lookup_symbol_x:
...
0x00000031f74094f7 <+1015>: leaveq
0x00000031f74094f8 <+1016>: retq
readelf -wf on the binary shows:
00000550 00000024 00000554 FDE cie=00000000 pc=31f7409100..31f7409db7
DW_CFA_advance_loc: 1 to 31f7409101
DW_CFA_def_cfa_offset: 16
DW_CFA_offset: r6 at cfa-16
DW_CFA_advance_loc: 3 to 31f7409104
DW_CFA_def_cfa_reg: r6
DW_CFA_advance_loc: 6 to 31f740910a
DW_CFA_offset: r13 at cfa-40
DW_CFA_offset: r14 at cfa-32
DW_CFA_offset: r15 at cfa-24
DW_CFA_advance_loc: 16 to 31f740911a
DW_CFA_offset: r3 at cfa-56
DW_CFA_offset: r12 at cfa-48
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
i.e. missing unwind info around 31f74094f8.
I remember people having better luck when compiling everything
with -fasynchronous-unwind-tables.
-Arun
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