Public bug reported:
Using libc6_2.13-24ubuntu2_amd64.deb with
libc6-dbg_2.13-24ubuntu2_amd64.deb,
gdb -q /bin/date
Reading symbols from /bin/date...done.
(gdb) set stop-on-solib-events 1
(gdb) run
Starting program: /bin/date
Stopped due to shared library event
(gdb) bt
#0 0x00007ffff7deb300 in _dl_debug_state () from /lib64/ld-linux-x86-64.so.2
#1 0x00007ffff7ddf386 in ?? () from /lib64/ld-linux-x86-64.so.2
#2 0x00007ffff7df1014 in ?? () from /lib64/ld-linux-x86-64.so.2
#3 0x00007ffff7de118f in ?? () from /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff7ddd5b8 in ?? () from /lib64/ld-linux-x86-64.so.2
#5 0x0000000000000001 in ?? ()
#6 0x00007fffffffe7bc in ?? ()
#7 0x0000000000000000 in ?? ()
(gdb) quit
Note lack of debug symbols for /lib64/ld-linux-x86-64.so.2
The problem is that /lib64/ld-linux-x86-64.so.2 has .gnu_debuglink of
"ld-2.13.so".
This means that GDB will look for /usr/lib/debug/lib64/ld-2.13.so (not present)
and will not look for /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.13.so (which is
present).
strace confirms that:
grep 'ld-2.13.so"' /tmp/strace.out
open("/lib64/ld-2.13.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/.debug/ld-2.13.so", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/usr/lib/debug//lib64/ld-2.13.so", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/usr/lib/debug/lib64/ld-2.13.so", O_RDONLY) = -1 ENOENT (No such file or
directory)
readlink("/lib64/ld-linux-x86-64.so.2", "/lib/x86_64-linux-gnu/ld-2.13.so"...,
4095) = 32
lstat("/lib/x86_64-linux-gnu/ld-2.13.so", {st_mode=S_IFREG|0755,
st_size=141088, ...}) = 0
Arguably, GDB should do readlink("/lib64/ld-linux-x86-64.so.2"), and look for
the real path name as well. If GDB did that, it would have worked.
But for now, libc6-dbg should probably provide a symlink from
/usr/lib/debug/lib64/ld-2.13.so to
/usr/lib/debug/lib/x86_64-linux-gnu/ld-2.13.so
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/914448
Title:
libc6-dbg puts ld-2.X.so into wrong location
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