Red Hat Bugzilla – Bug 821153
ocaml on armv7hl: some native binaries segfault with the new arm compiler backend
Last modified: 2012-06-06 09:14:51 EDT
Description of problem:
Recently we updated the code generated for the OCaml compiler
on arm in Fedora 17:
* Sat Apr 28 2012 Richard W.M. Jones <email@example.com> 3.12.1-3
- New ARM backend by Benedikt Meurer, backported to OCaml 3.12.1.
This has several advantages, including enabling natdynlink on ARM.
- Provide updated config.guess and config.sub (from OCaml upstream tree).
Mostly this appeared to work, but virt-sysprep segfaults
(although it used to work, so I don't quite know what changed).
$ ./run gdb --args ./sysprep/virt-sysprep --help
Starting program: /home/rjones/d/libguestfs/sysprep/virt-sysprep --help
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x402f3b70 in ?? ()
#0 0x402f3b70 in ?? ()
#1 0x0007ca44 in caml_c_call ()
#2 0x0007ca44 in caml_c_call ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Version-Release number of selected component (if applicable):
? 100% right now, 0% earlier.
Steps to Reproduce:
1. Compile libguestfs from git.
2. Segfaults when it runs virt-sysprep during the build.
Possibly the working version was 1.17.36.
(In reply to comment #1)
> Possibly the working version was 1.17.36.
Confirmed, it works with virt-sysprep 1.17.36.
There's very little difference between the two versions, but at
least I have something to work with now.
Here is another program that segfaults:
ocamlopt.opt -noassert -I internal -I public -I toolslib -I . -o mappings/gen_mappings.opt bigarray.cmxa str.cmxa toolslib.cmxa mappings/gen_mappings.cmx
cd mappings && ./gen_mappings.opt
/bin/sh: line 1: 17865 Segmentation fault ./gen_mappings.opt
This is from the ocaml-camomile package, although it's
worth noting that many other programs from the same
package do work fine.
(In reply to comment #3)
> Here is another program that segfaults:
> ocamlopt.opt -noassert -I internal -I public -I toolslib -I . -o
> mappings/gen_mappings.opt bigarray.cmxa str.cmxa toolslib.cmxa
> cd mappings && ./gen_mappings.opt
> /bin/sh: line 1: 17865 Segmentation fault ./gen_mappings.opt
> This is from the ocaml-camomile package, although it's
> worth noting that many other programs from the same
> package do work fine.
I contacted Benedikt Meurer (author of the new ARM backend)
and he was able to reproduce this problem and says he will
look into it.
Fixed upstream in revision 12548.
Fixed in ocaml-3.12.1-9.
ocaml-3.12.1-9.fc17 has been submitted as an update for Fedora 17.
ocaml-3.12.1-11.fc17 has been submitted as an update for Fedora 17.