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Re: [RFA] Don't use thread_db on corefiles
On Thu, Dec 13, 2001 at 12:21:48PM -0800, Michael Snyder wrote:
> Daniel Jacobowitz wrote:
> > This patch fixes a really frustrating internal error when you open the
> > coredump of a multithreaded application. Depending on your kernel, either
> > the core has threads (corefile.c supports this just fine) or it doesn't.
> > Neither way will opening libthread_db work right.
> Daniel, what exactly is the problem that you are solving?
> What do you mean by "work right"?
Work at all. Witness:
drow@nevyn:~/crash% gdb ./lotsa_um core
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This GDB was configured as "i386-linux"...
Core was generated by `./lotsa_um'.
Reading symbols from /lib/libpthread.so.0...done.
warning: Unable to set global thread event mask: generic error
[New Thread 1024 (LWP 153)]
Error while reading shared library symbols:
Cannot enable thread event reporting for Thread 1024 (LWP 153): generic error
Reading symbols from /lib/librt.so.1...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0 main (argc=1, argv=0xbffffec4) at lotsa_crash.c:35
35 *(int *) 0 = 0;
(gdb) info threads
../../gdb/lin-lwp.c:1292: gdb-internal-error: lin_lwp_thread_alive: Assertion `is_lwp (ptid)' failed.
An internal GDB error was detected. This may make further
debugging unreliable. Continue this debugging session? (y or n)
> > This patch isn't quite complete, because strange things happen when you
> > connect to a remote target too. But fixing that requires a little more
> > fiddling.
> I don't think that "target_has_execution" is the right thing
> to be testing here, if what you're really looking for is
> "is this a corefile?"
Well, the errors are on trying to write to inferior memory mostly. Tieing that to
target_has_execution made sense to me.
Daniel Jacobowitz Carnegie Mellon University
MontaVista Software Debian GNU/Linux Developer