More with Mozilla and glibc

Kevin Hendricks khendricks at
Sat Sep 11 13:11:52 EST 1999


I get this same error trying to debug the native threads version of the jdk.  I
don't think the problem is in glibc at all.  

The problem is in 4.17 versions of gdb under glibc 2.1.  In fact gdb can't
handle the realtime signals yet and so it stops when it receives one. 
Therefore the error message in no way indicates the actual seg-fault or bug you
are trying to find and fix.

I think gdb simply has no maintainer yet (Kevin Buettner will be keeping it
up, if he hasn't started already) and no one has updated it to reflect all of
the new realtime signals now available in glibc 2.1.  The error message you get
just prevents me from using gdb 4.17 when debugging any native threads
(libpthread code).    Once the new thread signals numbers are included, you
should be able to use the handle nostop command in gdb to prevent the
libpthread signals from disrupting your debugging.

The only workaround I know of is to rebuild linuxthreads (part of glibc) and
manually turn off the use of the new realtime signals and instead use the old
SIGUSR1 and SIGUSR2 signals for libpthreads until gdb gets fixed.

I hope this helps.


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