RE: [linux-lvm] lvcreate segfault in vg_setup_pointers_for_snapshots

From: "Jason A. Lixfeld" <jlixfeld@andromedas.com>
To: linux-lvm@sistina.com
Subject: RE: [linux-lvm] lvcreate segfault in vg_setup_pointers_for_snapshots
Date: Thu, 4 Oct 2001 10:01:09 -0400	[thread overview]
Message-ID: <009701c14cdd$06877ab0$836788cf@industry> (raw)
In-Reply-To: <009601c14cc9$27e34db0$836788cf@industry>

Since I'm having trouble with rc-4 can I use another version that is
still compatible with everything and won't segfault!? :)

> -----Original Message-----
> From: linux-lvm-admin@sistina.com 
> [mailto:linux-lvm-admin@sistina.com] On Behalf Of Jason A. Lixfeld
> Sent: October 4, 2001 7:39 AM
> To: linux-lvm@sistina.com
> Subject: RE: [linux-lvm] lvcreate segfault in 
> vg_setup_pointers_for_snapshots
> 
> 
> 
> 
> 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@sistina.com
> > [mailto:linux-lvm-admin@sistina.com] On Behalf Of Andreas Dilger
> > Sent: October 4, 2001 2:05 AM
> > To: linux-lvm@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
> > 
> > 
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm@sistina.com
> > http://lists.sistina.com/mailman/listinfo/linu> x-lvm
> > read the 
> > LVM HOW-TO at 
> > http://www.sistina.com/lvm/Pages/howto.html
> > 
> 
> 
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> 