Description of problem: I'm using gdb & pstack to take backtraces of a problematic kded4 while it's running (it's spending 40% of the cpu in the kernel). I had already debuginfo-installed the package kded4 belongs to and the packages needed to fill in the question marks seen after the first run of pstack. I then ran a backtrace inside gdb (because of already reported problems with pstack) and installed all the debuginfo packages it recommended. After this, but before the next time I tried to get a backtrace, prelink ran. Now a gdb backtrace gives me much less information than before (see attached files). I'm not sure how well gdb should cope with resolving symbols from re-prelinked libraries, when the executable it's attached to linked against the old libraries, but I see that it's trying at least. I see lots of lines like "/usr/sbin/prelink: /usr/lib/debug/usr/bin/kded4.debug: PT_INTERP segment not corresponding to .interp section" in the prelink log. Don't know whether that's relevant. Version-Release number of selected component (if applicable): prelink-0.4.0-3.i386 gdb-6.8-29.fc10.i386 yum-utils-1.1.19-1.fc10.noarch
Created attachment 341454 [details] gdb kded4 before additional debuginfo-install and prelink
Created attachment 341455 [details] gdb kded4 after additional debuginfo-install and prelink
(In reply to comment #0) > I see lots of lines like "/usr/sbin/prelink: > /usr/lib/debug/usr/bin/kded4.debug: PT_INTERP segment not corresponding to > .interp section" in the prelink log. Don't know whether that's relevant. This part is a known prelink bug although it is completely harmless. Otherwise thanks for a valid bugreport, one can suggest restarting the inferior as a workaround.
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I find it as working with: gdb-7.0-13.fc12.x86_64 rm -f /tmp/pause;echo -e '#include <unistd.h>\nint main (void) { return pause (); }' >/tmp/pause.c;gcc -fPIE -pie -o /tmp/pause -Wall -g /tmp/pause.c;/tmp/pause&p=$!;sleep 1;prelink -RN /tmp/pause;gdb -nx -ex 'set confirm no' -ex bt -ex q /tmp/pause $p #0 0x00007fb3f465bd00 in __pause_nocancel () at ../sysdeps/unix/syscall-template.S:82 #1 0x00007fb3f4b50705 in main () at /tmp/pause.c:2
I can confirm this with the test in comment #6 as well as with the original kded case.