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uudruid74

grub-mkimage crashes, can't install

Question

I investigated as to why my grub wouldn't install when it looked like the compile was OK.  Now emerging GDB and also attempting to re-emerge with different CFLAGS (just -O2, removing -march=native).

Taro build-pc # ./grub-mkimage --help
Usage: grub-mkimage [OPTION...] [OPTION]... [MODULES]
Make a bootable image of GRUB.

  -c, --config=FILE          embed FILE as an early config
Segmentation fault (core dumped)

What's weird is it should just be printing some output.  That shouldn't crash it unless there is a major bug.

 

Well ... it installed.  Is there some way to tell portage to change CFLAGS for a certain program?  Is there an /etc/portage/package.cflags?  I know the ebuilds can do it, but the ebuild isn't filtering out -march=native, which is definately breaking grub (like a bug somewhere).  I'm gonna compile the broken one, just so I can gdb it.

Program received signal SIGSEGV, Segmentation fault.
0x000000000041459a in memset ()
(gdb) bt
#0  0x000000000041459a in memset ()
#1  0x0000000000414672 in memset ()
#2  0x0000000000414672 in memset ()
#3  0x0000000000414672 in memset ()
#4  0x0000000000414672 in memset ()

This repeats until the stack overflows ... at least 10000 times.  Weird eh?
 

I think its related to this GCC bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888

It looks like even gcc's own test suite caches the bug and yet they released it anyway :/  Only bites with -O3 when doing something like that looks like a memcopy.  GCC will optimize by calling the library routine which can result in an infinite loop.   In which case you can fix the source with:

#pragma GCC optimize ("no-tree-loop-distribute-patterns")

Or just tweak the ebuild to add "-fno-tree-loop-distribute-patterns" to the CFLAGS in the ebuild and be done with it.

 

Yup - this fixes it!  Off to file a bug.  (and keeping that -fno-tree-loop-... in my global CFLAGS, who knows what other apps will silently fail - I should probably recompile EVERYTHING).

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