Re: [Libunwind-devel] Testing time

[Arun Sharma]

On Fri, Mar 25, 2011 at 8:12 PM, Arun Sharma <address@hidden> wrote:

> FAILURE: unw_step() returned -8 for ip=2b566374879e (start ip=2b566374879e)
> unwind failed with ret=-8
> FAILURE: detected 2 errors
> FAIL: run-ptrace-misc

I looked into this failure a bit more. It looks like missing unwind
info for _dl_rtld_di_serinfo in /lib/ld-linux.so.2 (rtld) shipped with
ubuntu.

Running with -v shows:

00007ff044d2b79d _dl_rtld_di_serinfo+0x1c6d       (sp=00007fff4bb1ae50)
        proc=00007ff044d2b5c0-00007ff044d2c3ad
        handler=0 lsda=0
00007ff044d2f791 _dl_rtld_di_serinfo+0x5c61       (sp=00007fff4bb1ae60)
        proc=00007ff044d2f6a0-00007ff044d2f894
        handler=0 lsda=0
00007ff044d36325 _dl_make_stack_executable+0x2b55 (sp=00007fff4bb1aeb0)
        proc=00007ff044d362f0-00007ff044d36351
        handler=0 lsda=0
000000000040075c func+0x8c                        (sp=00007fff4bb1af00)
        proc=00000000004006d0-0000000000400776
        handler=0 lsda=0
000000000040070b func+0x3b                        (sp=00007fff4bb1bf30)
        proc=00000000004006d0-0000000000400776
        handler=0 lsda=0
000000000040124e bar+0xace                        (sp=00007fff4bb1cf60)
        proc=0000000000400780-0000000000401274
        handler=0 lsda=0
00000000004012b3 main+0x33                        (sp=00007fff4bb1d330)
        proc=0000000000401280-00000000004012ca
        handler=0 lsda=0
00007ff0449bcc4d __libc_start_main+0xfd           (sp=00007fff4bb1d340)
        proc=00007ff0449bcb50-00007ff0449bcd17
        handler=0 lsda=0
0000000000400609 _start+0x29                      (sp=0000FAILURE:
unw_step() returned -8 for ip=7ff044d2b79e (start ip=7ff044d2b79e)

and sure enough, readelf shows there is no unwind info for
_dl_rtld_di_serinfo. Hopefully, gcc-4.5+ compiled distros get this
right.

 -Arun