Bug#664088: mdadm fails to initialize components for bitmap

[Markus Hochholdinger]

Hello Michael,

Am 12.04.2012 um 21:38 Uhr schrieb Michael Tokarev <mjt at tls.msk.ru>:
> On 31.03.2012 01:28, Markus Hochholdinger wrote:
> > Package: mdadm
> > Version: 3.2.3-2
> > Followup-For: Bug #664088
> > Dear Maintainer,
> > seems I've been stumbled over this bug. I'm running wheezy and can
> > reproduce a crash: mdadm --grow /dev/md0 --bitmap=none
> > mdadm --grow /dev/md0 --bitmap=internal
> > A few seconds after this, the system is still alive, I see the newly
> > created bitmap in /proc/mdstat, and then the system crashes: [ 
> > 342.437949] md0: bitmap file is out of date (0 < 322) -- forcing full
> > recovery [  342.437967] created bitmap (1 pages) for device md0
> > [  347.949946] BUG: unable to handle kernel NULL pointer dereference at
> > 00000008 [  347.949969] IP: [<eda5edbd>] bitmap_endwrite+0x138/0x199
> > [md_mod] [  347.949991] *pdpt = 0000000002660007 *pde = 0000000000000000
> > [  347.950010] Oops: 0000 [#1] SMP
> Oh.  This is a kernel bug, kernel should not crash like this even if
> incorrect bitmap is created.
> Marcus, what's your kernel version?

Linux 3.2.0-2-686-pae from wheezy.

Hm, perhaps I could use mdadm from squeeze to check weather the kernel also 
crashes.


-- 
greetings

eMHa
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