[linux-lvm] lvcreate segfault in vg_setup_pointers_for_snapshots

[Jason A. Lixfeld]

Ok, done...

http://www.andromedas.com/lvm/session.log

It's 35MB and I'm only on a 3MB DSL connection so it's gonna take a
while to load! :)

> -----Original Message-----
> From: linux-lvm-admin at sistina.com 
> [mailto:linux-lvm-admin at sistina.com] On Behalf Of Andreas Dilger
> Sent: October 4, 2001 2:05 AM
> To: linux-lvm at sistina.com
> Subject: Re: [linux-lvm] lvcreate segfault in 
> vg_setup_pointers_for_snapshots
> 
> 
> 
> On Oct 03, 2001  23:46 -0400, Jason A. Lixfeld wrote:
> > Wow!  Lots and LOTS of stuff!!  Didn't think it was ever going to 
> > end!!
> 
> Some of it is even useful.  Maybe you can include some of the 
> stuff at the end, or put it on a web page somewhere.
> 
> > Here's what yer looking for:
> > 
> > #0  lv_create (vg=0x8, lv=0xbffffb74, 
> >     lv_name=0xbffffb98 
> > 
> "????????????????????????????????\002???!???,???<???D???T???b???s???\2
> > 01
> > ???\214???\227???????")
> >     at lv_create_remove.c:42
> > #1  0x0804b03d in strcpy () at ../sysdeps/generic/strcpy.c:31
> 
> So it is dereferencing an uninitialized string (or so it 
> appears).  It may be that the string is corrupted elsewhere, 
> however.  I'm surprised that
> lv_check_name() in lv_create_remove() didn't catch this.  
> However, this may also be a red herring, since sometimes GDB 
> shows junk.
> 
> It is also suspicious because the lv and lv_name pointers are 
> 0x24 apart, which shouldn't be the case since lv_name is the 
> first item in lv_t.
> 
> > #2  0x4006c177 in __libc_start_main (main=0x8049390 <strcpy+384>, 
> > argc=8, ubp_av=0xbffffb74, init=0x8048e88 <_init>,
> >     fini=0x804b4d0 <_fini>, rtld_fini=0x4000e184 <_dl_fini>,
> > stack_end=0xbffffb6c) at ../sysdeps/generic/libc-start.c:129
> 
> If you try running with "export MALLOC_CHECK_=2 gdb 
> <path>/lvcreate", it may give more indication as to where the 
> actual corruption is happening.
> 
> I just recompiled the tools, and did not have any problems 
> with lvcreate, so it must be something strange.
> 
> Cheers, Andreas
> --
> Andreas Dilger  \ "If a man ate a pound of pasta and a pound 
> of antipasto,
>                  \  would they cancel out, leaving him still hungry?"
> http://www-mddsp.enel.ucalgary.ca/People/adilger/             
>   -- Dogbert
> 
> 
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