http://bugzilla.kernel.org/show_bug.cgi?id=15576 Summary: Data Loss (flex_bg and ext4_mb_generate_buddy errors) Product: File System Version: 2.5 Kernel Version: Linux elitemx-desktop 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12 05:23:09 UTC 2010 i686 GNU/Linux Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 AssignedTo: fs_ext4@xxxxxxxxxxxxxxxxxxxx ReportedBy: xpenev@xxxxxxxxx Regression: No # create a 484 cylinder disk [3.7 GB] dd of=disk.bin bs=512 count=0 seek=$((484*255*63)) # associate with loop device losetup /dev/loop0 disk.bin # generate bad blocks file [600 MB] for((i=360491;i<=497992;i++)); do echo $i; done > omit # format disk with ext4 mkfs.ext4 -l omit /dev/loop0 # mount disk mkdir foobar; mount /dev/loop0 foobar # create a 2 GB file cd foobar; dd if=/dev/zero bs=1024 count=$((1024 * 1024 * 2)) # check dmesg [ 9200.006021] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 12: 0 blocks in bitmap, 2 in gd [ 9200.010311] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 13: 0 blocks in bitmap, 2 in gd [ 9200.010359] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 14: 0 blocks in bitmap, 2 in gd [ 9200.010683] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 15: 9911 blocks in bitmap, 9913 in gd Worse off, however, if rather than creating a 2 GB file, you use this partition as the target root partition for installation using the latest [32-bit] Ubuntu installer ... consistently at 57 percent of the install ext4 reports data loss. [ 1129.344600] EXT4-fs error (device sda1): ext4_mb_generate_buddy: EXT4-fs: group 12: 0 blocks in bitmap, 2 in gd [ 1129.344626] Aborting journal on device sda1:8. [ 1129.380671] EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal [ 1129.380697] EXT4-fs (sda1): Remounting filesystem read-only [ 1129.492154] EXT4-fs (sda1): Remounting filesystem read-only [ 1129.542049] EXT4-fs error (device sda1): ext4_mb_generate_buddy: EXT4-fs: group 13: 0 blocks in bitmap, 2 in gd [ 1129.554043] EXT4-fs error (device sda1): ext4_mb_generate_buddy: EXT4-fs: group 14: 0 blocks in bitmap, 2 in gd [ 1129.574283] EXT4-fs error (device sda1): ext4_mb_generate_buddy: EXT4-fs: group 15: 9911 blocks in bitmap, 9913 in gd [ 1129.574343] mpage_da_map_blocks block allocation failed for inode 41510 at logical offset 0 with max blocks 6 with error -30 [ 1129.574352] This should not happen.!! Data will be lost [ 1129.574393] ext4_da_writepages: jbd2_start: 1000 pages, ino 41510; err -30 [ 1129.574406] Pid: 11796, comm: pdflush Not tainted 2.6.31-14-generic #48-Ubuntu [ 1129.574414] Call Trace: [ 1129.574440] [<c056e41c>] ? printk+0x18/0x1c [ 1129.574456] [<c0266162>] ext4_da_writepages+0x452/0x490 [ 1129.574474] [<c01ba551>] do_writepages+0x21/0x40 [ 1129.574489] [<c02033fe>] writeback_single_inode+0x16e/0x3d0 [ 1129.574503] [<c0150510>] ? process_timeout+0x0/0x10 [ 1129.574515] [<c0203afd>] generic_sync_sb_inodes+0x38d/0x4a0 [ 1129.574528] [<c0203ced>] writeback_inodes+0x4d/0xe0 [ 1129.574539] [<c01b9432>] wb_kupdate+0xa2/0x110 [ 1129.574551] [<c01bac27>] __pdflush+0xf7/0x1f0 [ 1129.574562] [<c01bad20>] ? pdflush+0x0/0x40 [ 1129.574573] [<c01bad20>] ? pdflush+0x0/0x40 [ 1129.574583] [<c01bad59>] pdflush+0x39/0x40 [ 1129.574594] [<c01b9390>] ? wb_kupdate+0x0/0x110 [ 1129.574606] [<c015bf8c>] kthread+0x7c/0x90 [ 1129.574616] [<c015bf10>] ? kthread+0x0/0x90 [ 1129.574630] [<c0104007>] kernel_thread_helper+0x7/0x10 -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- 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
