[Crash-utility] Re: Crash-utility Digest, Vol 31, Issue 10

Send Crash-utility mailing list submissions to crash-utility(a)redhat.com To subscribe or unsubscribe via the World Wide Web, visit https://www.redhat.com/mailman/listinfo/crash-utility or, via email, send a message with subject or body 'help' to crash-utility-request(a)redhat.com You can reach the person managing the list at crash-utility-owner(a)redhat.com When replying, please edit your Subject line so it is more specific than "Re: Contents of Crash-utility digest..." Today's Topics: 1. x86_64 crash (cross-platform) (Cliff Wickman) 2. Re: x86_64 crash (cross-platform) (Chip Coldwell) ---------------------------------------------------------------------- Message: 1 Date: Tue, 15 Apr 2008 15:34:38 -0500 From: Cliff Wickman <cpw(a)sgi.com&gt; Subject: [Crash-utility] x86_64 crash (cross-platform) To: anderson(a)redhat.com Cc: crash-utility(a)redhat.com Message-ID: <E1JlrrS-0002i7-Oe(a)eag09.americas.sgi.com&gt; Hi Dave, We've recently seen lcrash fail with a floating point exception very early in initialization. Seems to be a binary compiled under one distribution and then executed on another. And the solution seems to be the -Wl,--hash-style=both option. Have others reported this? There must be a cleaner solution than in my notes below. That is, an easier way to link with this option. Thanks. -Cliff -------------------------------------------------------------------------- To make crash so that it runs under SLES or RedHat: cd /home/estes02/cpw/crash-4.0-6.2 make Compile it on a SLES system: good: cpw@spandau:/tmp/cpw/crash-4.0-6.2> readelf -S crash | grep -A1 hash [ 4] .hash HASH 0000000000400290 00000290 0000000000009490 0000000000000004 A 5 0 8 on a RHEL: bad: cpw@alcatraz crash-4.0-6.2 $ readelf -S crash | grep -A1 hash [ 3] .gnu.hash GNU_HASH 0000000000400240 00000240 000000000000a040 0000000000000000 A 4 0 8 OR vi gdb-6.1/gdb/configure --- if test "$GCC" = yes; then CFLAGS="-g -O2 -Wl,--hash-style=both" else CFLAGS="-g -Wl,--hash-style=both" fi else if test "$GCC" = yes; then CFLAGS="-O2 -Wl,--hash-style=both" else CFLAGS="-Wl,--hash-style=both" --- make readelf -S crash | grep -A1 hash (should show GNU form) cpw@alcatraz crash-4.0-6.2 $ readelf -S crash | grep -A1 hash [ 3] .hash HASH 0000000000400240 00000240 0000000000009490 0000000000000004 A 5 0 8 [ 4] .gnu.hash GNU_HASH 00000000004096d0 000096d0 000000000000a040 0000000000000000 A 5 0 8 ------------------------------------------------------------------------ ------------------------------ Message: 2 Date: Tue, 15 Apr 2008 16:43:30 -0400 (EDT) From: Chip Coldwell <coldwell(a)redhat.com&gt; Subject: Re: [Crash-utility] x86_64 crash (cross-platform) To: "Discussion list for crash utility usage, maintenance and development" <crash-utility(a)redhat.com&gt; Message-ID: <alpine.LRH.1.00.0804151642150.32524(a)bogart.boston.redhat.com&gt; Content-Type: TEXT/PLAIN; charset=US-ASCII On Tue, 15 Apr 2008, Cliff Wickman wrote: > > Hi Dave, > > We've recently seen lcrash fail with a floating point exception > very early in initialization. > Seems to be a binary compiled under one distribution and then > executed on another. > > And the solution seems to be the -Wl,--hash-style=both option. > > Have others reported this? This isn't specific to crash; it's the result of a change in the Linux/glibc ABI. Specifically, the new ABI has a .hash.gnu section whereas the old one has .hash. Your linker option above causes both sections to be included, so that the old dynamic loader can load a binary built with a new toolchain. Chip -- Charles M. "Chip" Coldwell Senior Software Engineer Red Hat, Inc 978-392-2426 GPG ID: 852E052F GPG FPR: 77E5 2B51 4907 F08A 7E92 DE80 AFA9 9A8F 852E 052F ------------------------------ -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility End of Crash-utility Digest, Vol 31, Issue 10 *********************************************