Re: Installing grub2 with /boot on software raid

[Wesley PA4WDH]

Hi All,

I see my email was a bit dodgy, i'm sorry for that. 

--- On Tue, 7/2/13, Wesley PA4WDH <address@hidden> wrote:
> Actually, the "double free corrution"s are new, it didn't do
> that yesterday so i'll check that out. 

I tried different things, but found no way to get rid of it:
- Tried kernel version 2.6.37(with gentoo patches) and 3.8.13(from kernel.org)
- Tried different compile options for grub (especially nls and device-mapper)
- I wiped /boot, removed grub2 and grub-legacy to start over with grub2 only

The problem seems to be in grub2-probe, if i point it to a regular partition it 
works fine:
Gentoo-11 ~ # grub2-probe -d /dev/sdb1
fat
Gentoo-11 ~ # grub2-probe -d /dev/sdb2
ext2

However, as soon as i point it towards one of the md devices it gives the right 
answer and gives the double free error:
Gentoo-11 ~ # grub2-probe -d /dev/sda1
ext2
*** glibc detected *** grub2-probe: double free or corruption (fasttop): 
0x00007eff3add5d80 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7d586)[0x7eff3a56c586]
grub2-probe(+0xbbf49)[0x7eff3ab77f49]
grub2-probe(+0xcfdaa)[0x7eff3ab8bdaa]
grub2-probe(+0xcfff3)[0x7eff3ab8bff3]
grub2-probe(+0xcffb5)[0x7eff3ab8bfb5]
grub2-probe(+0xd9e6)[0x7eff3aac99e6]
grub2-probe(main+0x311)[0x7eff3aac5a77]
/lib64/libc.so.6(__libc_start_main+0xed)[0x7eff3a5135dd]
grub2-probe(+0x73d9)[0x7eff3aac33d9]
======= Memory map: ========
7eff3a2d8000-7eff3a2ed000 r-xp 00000000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7eff3a2ed000-7eff3a4ed000 ---p 00015000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7eff3a4ed000-7eff3a4ee000 r-xp 00015000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7eff3a4ee000-7eff3a4ef000 rwxp 00016000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7eff3a4ef000-7eff3a68e000 r-xp 00000000 09:01 98361                      
/lib64/libc-2.15.so
7eff3a68e000-7eff3a88e000 ---p 0019f000 09:01 98361                      
/lib64/libc-2.15.so
7eff3a88e000-7eff3a892000 r-xp 0019f000 09:01 98361                      
/lib64/libc-2.15.so
7eff3a892000-7eff3a894000 rwxp 001a3000 09:01 98361                      
/lib64/libc-2.15.so
7eff3a894000-7eff3a898000 rwxp 00000000 00:00 0 
7eff3a898000-7eff3a8b9000 r-xp 00000000 09:01 98439                      
/lib64/ld-2.15.so
7eff3aaae000-7eff3aab1000 rwxp 00000000 00:00 0 
7eff3aab6000-7eff3aab9000 rwxp 00000000 00:00 0 
7eff3aab9000-7eff3aaba000 r-xp 00021000 09:01 98439                      
/lib64/ld-2.15.so
7eff3aaba000-7eff3aabb000 rwxp 00022000 09:01 98439                      
/lib64/ld-2.15.so
7eff3aabb000-7eff3aabc000 rwxp 00000000 00:00 0 
7eff3aabc000-7eff3abbf000 r-xp 00000000 09:01 428871                     
/usr/sbin/grub2-probe
7eff3adbf000-7eff3adc0000 r-xp 00103000 09:01 428871                     
/usr/sbin/grub2-probe
7eff3adc0000-7eff3adc7000 rwxp 00104000 09:01 428871                     
/usr/sbin/grub2-probe
7eff3adc7000-7eff3af9b000 rwxp 00000000 00:00 0                          [heap]
7fff76689000-7fff766ae000 rwxp 00000000 00:00 0                          [stack]
7fff76744000-7fff76745000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  
[vsyscall]
Aborted

I've searched around and found a few similar bug reports stating that it 
sometimes works and sometimes gives this error, so i tried it several times (i 
didn't count, but it was 10+ times for sure) and never gave a normal result.

Just to be complete, this is the full output of a grub2-install /dev/sda
Gentoo-11 grub2 # grub2-install /dev/sda
*** glibc detected *** /usr/sbin/grub2-probe: double free or corruption 
(fasttop): 0x00007fe18e0e6120 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7d586)[0x7fe18d63d586]
/usr/sbin/grub2-probe(+0xbd5bd)[0x7fe18de875bd]
/usr/sbin/grub2-probe(+0xd142e)[0x7fe18de9b42e]
/usr/sbin/grub2-probe(+0xd1677)[0x7fe18de9b677]
/usr/sbin/grub2-probe(+0xd1639)[0x7fe18de9b639]
/usr/sbin/grub2-probe(+0xe1da)[0x7fe18ddd81da]
/usr/sbin/grub2-probe(main+0x315)[0x7fe18ddd4246]
/lib64/libc.so.6(__libc_start_main+0xed)[0x7fe18d5e45dd]
/usr/sbin/grub2-probe(+0x7bb9)[0x7fe18ddd1bb9]
======= Memory map: ========
7fe18cd6f000-7fe18cd84000 r-xp 00000000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7fe18cd84000-7fe18cf84000 ---p 00015000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7fe18cf84000-7fe18cf85000 r-xp 00015000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7fe18cf85000-7fe18cf86000 rwxp 00016000 09:01 198945                     
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/libgcc_s.so.1
7fe18cf86000-7fe18cf9e000 r-xp 00000000 09:01 98446                      
/lib64/libpthread-2.15.so
7fe18cf9e000-7fe18d19d000 ---p 00018000 09:01 98446                      
/lib64/libpthread-2.15.so
7fe18d19d000-7fe18d19e000 r-xp 00017000 09:01 98446                      
/lib64/libpthread-2.15.so
7fe18d19e000-7fe18d19f000 rwxp 00018000 09:01 98446                      
/lib64/libpthread-2.15.so
7fe18d19f000-7fe18d1a3000 rwxp 00000000 00:00 0 
7fe18d1a3000-7fe18d1ab000 r-xp 00000000 09:01 98455                      
/lib64/librt-2.15.so
7fe18d1ab000-7fe18d3aa000 ---p 00008000 09:01 98455                      
/lib64/librt-2.15.so
7fe18d3aa000-7fe18d3ab000 r-xp 00007000 09:01 98455                      
/lib64/librt-2.15.so
7fe18d3ab000-7fe18d3ac000 rwxp 00008000 09:01 98455                      
/lib64/librt-2.15.so
7fe18d3ac000-7fe18d3be000 r-xp 00000000 09:01 98391                      
/lib64/libudev.so.1.3.5
7fe18d3be000-7fe18d5be000 ---p 00012000 09:01 98391                      
/lib64/libudev.so.1.3.5
7fe18d5be000-7fe18d5bf000 r-xp 00012000 09:01 98391                      
/lib64/libudev.so.1.3.5
7fe18d5bf000-7fe18d5c0000 rwxp 00013000 09:01 98391                      
/lib64/libudev.so.1.3.5
7fe18d5c0000-7fe18d75f000 r-xp 00000000 09:01 98361                      
/lib64/libc-2.15.so
7fe18d75f000-7fe18d95f000 ---p 0019f000 09:01 98361                      
/lib64/libc-2.15.so
7fe18d95f000-7fe18d963000 r-xp 0019f000 09:01 98361                      
/lib64/libc-2.15.so
7fe18d963000-7fe18d965000 rwxp 001a3000 09:01 98361                      
/lib64/libc-2.15.so
7fe18d965000-7fe18d969000 rwxp 00000000 00:00 0 
7fe18d969000-7fe18d9a2000 r-xp 00000000 09:01 413253                     
/lib64/libdevmapper.so.1.02
7fe18d9a2000-7fe18dba1000 ---p 00039000 09:01 413253                     
/lib64/libdevmapper.so.1.02
7fe18dba1000-7fe18dba2000 r-xp 00038000 09:01 413253                     
/lib64/libdevmapper.so.1.02
7fe18dba2000-7fe18dba5000 rwxp 00039000 09:01 413253                     
/lib64/libdevmapper.so.1.02
7fe18dba5000-7fe18dba6000 rwxp 00000000 00:00 0 
7fe18dba6000-7fe18dbc7000 r-xp 00000000 09:01 98439                      
/lib64/ld-2.15.so
7fe18ddbb000-7fe18ddbf000 rwxp 00000000 00:00 0 
7fe18ddc0000-7fe18ddc7000 rwxp 00000000 00:00 0 
7fe18ddc7000-7fe18ddc8000 r-xp 00021000 09:01 98439                      
/lib64/ld-2.15.so
7fe18ddc8000-7fe18ddc9000 rwxp 00022000 09:01 98439                      
/lib64/ld-2.15.so
7fe18ddc9000-7fe18ddca000 rwxp 00000000 00:00 0 
7fe18ddca000-7fe18decf000 r-xp 00000000 09:01 429010                     
/usr/sbin/grub2-probe
7fe18e0cf000-7fe18e0d0000 r-xp 00105000 09:01 429010                     
/usr/sbin/grub2-probe
7fe18e0d0000-7fe18e0d7000 rwxp 00106000 09:01 429010                     
/usr/sbin/grub2-probe
7fe18e0d7000-7fe18e380000 rwxp 00000000 00:00 0                          [heap]
7fff8ec25000-7fff8ec69000 rwxp 00000000 00:00 0                          [stack]
7fff8edff000-7fff8ee00000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  
[vsyscall]
/usr/share/grub/grub-mkconfig_lib: line 53: 14560 Aborted                 
"${grub_probe}" -t fs "$path" > /dev/null 2>&1
Path `/boot/grub2' is not readable by GRUB on boot. Installation is impossible. 
Aborting.

I'm a bit out of options now. Any suggestions ?

Best regards,
Wesley