From: Matt Z. <md...@de...> - 2004-01-12 18:36:32
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On Wed, Jan 07, 2004 at 11:07:18PM -0800, Matt Zimmerman wrote: > On Mon, Jan 05, 2004 at 09:58:32PM -0500, Jeff Dike wrote: > > > md...@de... said: > > > It turns out that this problem seems to be due to compiler > > > incompatibility. UML had been built with gcc 2.95 due to old breakage, > > > and when built with gcc 3.3 (as glibc is), everything starts working > > > again. My suspicion is that this is due to certain recent changes in > > > pthreads. > > > > Is it your opinion that there's no problem in UML itself? Having a field > > in the sigcontext getting magically munged is somewhat worrying. I'd be > > happier knowing what exactly was happening so I can be sure this wasn't > > exposing some subtle UML bug. > > I was not able to come to a satisfactory conclusion as to the origin of the > problem, and once I found a solution, I stopped looking. I'm copying > debian-gcc and debian-glibc in case they're interested. > > Summary for debian-{gcc,glibc}: > > UML built with gcc-2.95 fails to run correctly on a current unstable system > with a 2.4 kernel. The symptoms are very strange; This started to happen recently; UML had been building > with gcc 2.95 successfully for over 9 months now with no problems. > > Details are here: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=224431 By the way, the original reason why I started building UML with gcc-2.95 was because building with 3.x broke the slirp transport like so: Kernel panic: read of switch_pipe failed, errno = 9 errno 9 is EBADF. I never did find the real cause of that bug, but it has resurfaced now that I am building with gcc 3.3 again to fix the other, worse bug. I would be interested to know if anyone else has run into it. More information is here: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=176485&archive=yes -- - mdz |