From: Theodore Ts'o <tytso@mit.edu>
To: "Lukáš Czerner" <lczerner@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
"Linux Kernel Mailinlinux-ext4@vger.kernel.orgg List"
<linux-kernel@vger.kernel.org>,
linux-ext4@vger.kernel.org
Subject: Re: ext4fs error "ext4_mb_generate_buddy:741:group 16, 8160 clusters in bitmap, 4064 in gd" (with repro)
Date: Thu, 16 Aug 2012 16:00:32 -0400 [thread overview]
Message-ID: <20120816200032.GE31346@thunk.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1208161619440.2459@vpn-8-20.rdu.redhat.com>
On Thu, Aug 16, 2012 at 04:28:07PM +0200, Lukáš Czerner wrote:
>
> After a little bit of tracing with the systemtap and blktrace ext4
> does not seem to be doing anything wrong and yet we get part of the
> block bitmap trimmed. This lead me to the scsi_debug driver itself
> and indeed it seems that we have off-by-one bug there in the
> unamp_region() which is causing the problem.
Thanks for finding this --- I was getting scared that ext4 users were
losing data in production. It's good to know it was just a bug in the
scsi_debug driver.
- Ted
prev parent reply other threads:[~2012-08-16 20:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-09 10:00 ext4fs error "ext4_mb_generate_buddy:741:group 16, 8160 clusters in bitmap, 4064 in gd" (with repro) Paolo Bonzini
2012-08-09 17:06 ` Theodore Ts'o
2012-08-15 9:17 ` Lukáš Czerner
2012-08-16 14:28 ` Lukáš Czerner
2012-08-16 20:00 ` Theodore Ts'o [this message]
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