linux-kernel - ext4fs error "ext4_mb_generate_buddy:741:group 16, 8160 clusters in bitmap, 4064 in gd" (with repro)

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Date:	Thu, 09 Aug 2012 12:00:09 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	tytso@....edu,
	"Linux Kernel Mailinlinux-ext4@...r.kernel.orgg List" 
	<linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org
Subject: ext4fs error "ext4_mb_generate_buddy:741:group 16, 8160 clusters
 in bitmap, 4064 in gd" (with repro)

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

Here is the output in dmesg:

[140934.644166] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[140941.562060] EXT4-fs error (device sdb1): ext4_mb_generate_buddy:741: group 16, 8160 clusters in bitmap, 4064 in gd
[140941.603066] EXT4-fs error (device sdb1): ext4_mb_generate_buddy:741: group 25, 8192 clusters in bitmap, 7934 in gd
[140941.613060] EXT4-fs error (device sdb1): ext4_mb_generate_buddy:741: group 27, 8192 clusters in bitmap, 7934 in gd
[140941.634074] EXT4-fs error (device sdb1): ext4_mb_generate_buddy:741: group 31, 8192 clusters in bitmap, 8159 in gd

Hope this helps,

Paolo
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