[Bug libc/5754] New: Kernel's CONFIG_COMPAT_VDSO leads to segfaults

["thomas dot jarosch at intra2net dot com" <sourceware-bugzilla at sourceware dot org>]

Hello there,

if you enable CONFIG_COMPAT_VDSO in the kernel, glibc 2.7 is unable to build 
itself/run. glibc just segfaults when it tries to run itself for the first 
time. Tested with kernel 2.6.23.14.

I also tested a vanilla Fedora 8 system and enabled CONFIG_COMPAT_VDSO, the 
system immediately crashed when running "init". The latest glibc 2.7.90 from 
Fedora HEAD crashes, too.

I've enabled this kernel option as I have some apps that still need to run 
against a glibc-2.1.3-29 from Redhat 6.2. The documentation in the kernel 
states the option is needed for glibc < 2.3.3. I disabled the option now and 
the old apps seem to run just fine. How can I test if I really need the compat 
mode?

Thanks in advance,
Thomas

PS: The latest glibc version in bugzilla's version selector is "2.4"...

-- 
           Summary: Kernel's CONFIG_COMPAT_VDSO leads to segfaults
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: thomas dot jarosch at intra2net dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=5754

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