Well, I think I found my bug. Sorry to bug you guys about it. I was calling free on a pointer that was not at beginning of it's memory block. I don't know why it would only seg fault on the alpha though...
Luke Shulenburger ([EMAIL PROTECTED]) Luke Shulenburger wrote: > Hello, > > I am a student taking a c programming class (I'm a fortran hacker) and > I believe I may have stumbled across a bug in libc for potato. I'm > attaching > my code. Please be kind as I am quite new at c. Anyway, if I run the > program, > tell it that I have 2 variables, t=0.0, y1 = 1.0, y2 = 10.0, RTOL = > 1.0e-5, > ATOL = 1.0e-200, I have no problems, the program exits normally. If > I give it > the exact same inputs, but change RTOL to 1.0e-7, the program dies with > a > seg fault. I thought this was interesting, so I tried running it in gdb > and it said that > the program died like so: > > Program received signal SIGSEGV, Segmentation fault. > 0x2000011fb04 in chunk_free () from /lib/libc.so.6.1 > > I tried several things to clear this up, but couldn't figure it out, so > I tried using > ccc instead of gcc and got the same thing. The thing that led me to > think it > might be a bug in the alpha version of glibc is that I took the same > code and > tried compiling it and running on an x86 running woody. There were no > problems > when I tried that, I also attempted to compile it and run it using gcc > on a sparc running > solaris. Once again, I could not reproduce the same errors that I had > gotten on > my alpha. > > Here is what information on gcc and the various libraries that I could > scrape together > for the different machines: > > my alpha: > gcc: version 2.95.2 20000220 (Debian GNU/Linux) > libc: libc6.1_2.2-5_alpha.deb > > the x86 box: > gcc version 2.95.2 20000220 (Debian GNU/Linux) > libc: glibc Version: 2.1.94-3 > > I can't get the c library version on the solaris box, but the gcc is: > gcc version 2.95 19990728 (release) > > Like I said earlier, I'm quite new to c, so this is in all likelihood > just a programming > error of mine that for some reason only manifests itself on alpha. > Please be kind. > And don't bother sending me corrections on the homework, first, I know > this is not > the place for that and second, it was already due :-) > > Luke Shulenburger > ([EMAIL PROTECTED]) > >
