Date: Fri, 16 Jan 2009 13:33:38 +0200 From: Danny Braniss <danny@cs.huji.ac.il> To: Christoph Mallon <christoph.mallon@gmx.de> Cc: Christian Kandeler <christian.kandeler@hob.de>, Garrett Cooper <yanefbsd@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: Confused by segfault with legitimate call to strerror(3) on amd64 / sysctl (3) setting `odd' errno's Message-ID: <E1LNmxG-000PSq-DI@kabab.cs.huji.ac.il> In-Reply-To: <497065ED.7050705@gmx.de> References: <7d6fde3d0901160041n55466290l55f737d274a40895@mail.gmail.com> <49704AEC.3080709@gmx.de> <200901161039.00232.christian.kandeler@hob.de> <49705FA2.2020605@gmx.de> <7d6fde3d0901160235o6aa1f096q11c5096b70f3577@mail.gmail.com> <497065ED.7050705@gmx.de>
next in thread | previous in thread | raw e-mail | index | archive | help
> Garrett Cooper schrieb: > > Ok, I just installworld'ed, recompiled the program with the > > following modifications, and I still get segfaults. And the question > > of the night is: why amd64 on a VERY recent CURRENT? > > I'm going to try the same app on an amd64 freebsd VMware instance > > with RELENG_7. > > Remember: just because a bunch of other people aren't reporting > > issues with CURRENT/amd64 doesn't mean that it isn't environmental, > > related to my hardware or compile options ;). > > Cheers, > > -Garrett > > > > #include <errno.h> > > #include <stdio.h> > > #include <sys/stat.h> > > > > int > > main() > > { > > > > struct stat sb; > > > > int o_errno; > > > > if (stat("/some/file/that/doesn't/exist", &sb) != 0) { > > o_errno = errno; > > printf("Errno: %d\n", errno); > > printf("%s\n", strerror(o_errno)); > > } > > > > return 0; > > > > } > > > > #include <errno.h> > > #include <stdio.h> > > #include <sys/stat.h> > > > > int > > main() > > { > > > > struct stat sb; > > > > int o_errno; > > > > if (stat("/some/file/that/doesn't/exist", &sb) != 0) { > > o_errno = errno; > > printf("Errno: %d\n", errno); > > printf("%s\n", strerror(o_errno)); > > } > > > > return 0; > > > > } > > > > [gcooper@optimus ~]$ gcc -o badfile badfile.c > > [gcooper@optimus ~]$ ./badfile > > Errno: 2 > > Segmentation fault: 11 (core dumped) > > [gcooper@optimus ~]$ > > Well, compile with -g, start in gdb, check what value is wrong, the > usual stuff. Probably the return value of strerror() is interesting. some facts: #include <stdio.h> int main() { printf("%s\n", strerror(2)); return 0; } 1- it works fine on i386 2- it bombs on amd64 3- with a local strerror.c (instead of the one in libc) works fine so, there is something realy wrong going on here! (and it gows back to at least 7.0-stable) danny
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?E1LNmxG-000PSq-DI>