On Thu, 9 Aug 2012, Theodore Ts'o wrote: > Date: Thu, 9 Aug 2012 13:06:40 -0400 > From: Theodore Ts'o <tytso@xxxxxxx> > To: Lukas Czerner <lczerner@xxxxxxxxxx> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>, > "Linux Kernel Mailinlinux-ext4@xxxxxxxxxxxxxxxx List" > <linux-kernel@xxxxxxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx > Subject: Re: ext4fs error > "ext4_mb_generate_buddy:741:group 16, 8160 clusters in bitmap, 4064 in gd" > (with repro) > > On Thu, Aug 09, 2012 at 12:00:09PM +0200, Paolo Bonzini wrote: > > Here is how to reproduce it. It happens during fstrim. I found other > > occurrences of the error in the mailing list, but they were not related > > to trim so they may be something different. > > > > modprobe scsi_debug dev_size_mb=256 lbpws=1 > > dd if=/dev/zero of=/dev/sdb bs=1M > > fdisk /dev/sdb > > >> create a new partition accepting all defaults > > fdisk -lu /dev/sdb|tail -1 > > >> should show: /dev/sdb1 57 524285 262114+ 83 Linux > > > > mkfs.ext4 /dev/sdb1 > > mkdir test > > mount /dev/sdb1 test > > fstrim ./test > > I can confirm that this accurately reproduces file system corruption > using a 3.5 kernel. It looks like some block allocation bitmap blocks > is getting trimmed when it shouldn't have been. Lukas, can you take a > look at this? > > - Ted Hi Ted, sorry for the delay, I've just got back from my vacation. I'll take a look at it. Thanks! -Lukas -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
