Date: Thu, 11 Apr 2019 04:47:43 +0100 From: Jamie Landeg-Jones <jamie@catflap.org> To: freebsd-stable@freebsd.org Subject: Replicable file-system corruption due to fsck/ufs Message-ID: <201904110347.x3B3lhpA034197@donotpassgo.dyslexicfish.net>
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I've noticed a replicable disk corruption by fsck_ufs/ffs on sparse files. This is on amd/64 12-stable-20190409, but I first noticed it on 12-stable-20190326. I didn't notice it on my previous build of 12-stable-20190107, but I may not have had any relevant sparse files at the time, so I don't know if that version was affected. 12-release worked OK. Here is a simplified replicable example. Thinking about it just now, I suspect it's triggered by files which end in sparseness. Can anyone else replicate this, or has my machine gone nuts? Cheers, Jamie | root@thompson# l | total 12 | 4 drwxr-x--- 2 root wheel - 512 11 Apr 04:08 ./ | 4 drwxr-xr-x 16 root wheel - 1,024 11 Apr 04:08 ../ | 4 -rw-r----- 1 root wheel - 43 11 Apr 04:08 typescript | | root@thompson# dd if=/dev/zero bs=1m count=2048 of=test.img | 2048+0 records in | 2048+0 records out | 2147483648 bytes transferred in 4.127411 secs (520298036 bytes/sec) | | root@thompson# l | total 2097708 | 4 drwxr-x--- 2 root wheel - 512 11 Apr 04:08 ./ | 4 drwxr-xr-x 16 root wheel - 1,024 11 Apr 04:08 ../ | 2097696 -rw-r----- 1 root wheel - 2,147,483,648 11 Apr 04:08 test.img | 4 -rw-r----- 1 root wheel - 43 11 Apr 04:08 typescript | | root@thompson# mdconfig test.img | md1 | | root@thompson# newfs /dev/md1 | /dev/md1: 2048.0MB (4194304 sectors) block size 32768, fragment size 4096 | using 4 cylinder groups of 512.03MB, 16385 blks, 65664 inodes. | super-block backups (for fsck_ffs -b #) at: | 192, 1048832, 2097472, 3146112 | | root@thompson# md mnt | mnt | | root@thompson# mount /dev/md1 mnt | | root@thompson# cd mnt/ | ~/x/mnt ~/x | | root@thompson# df . | Filesystem 1K-blocks Used Avail Capacity Mounted on | /dev/md1 2,031,132 8 1,868,636 0% /root/x/mnt | | root@thompson# l | total 12 | 4 drwxr-xr-x 3 root wheel - 512 11 Apr 04:09 ./ | 4 drwxr-x--- 3 root wheel - 512 11 Apr 04:09 ../ | 4 drwxrwxr-x 2 root operator - 512 11 Apr 04:09 .snap/ | | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | root@thompson# echo "testing 1...2...3..." >> test ; truncate -s +1g test | | root@thompson# l | total 652 | 4 drwxr-xr-x 3 root wheel - 512 11 Apr 04:14 ./ | 4 drwxr-x--- 3 root wheel - 512 11 Apr 04:09 ../ | 4 drwxrwxr-x 2 root operator - 512 11 Apr 04:09 .snap/ | 640 -rw-r----- 1 root wheel - 9,663,676,605 11 Apr 04:14 test | | root@thompson# sha256 -r test > sha256.out | | root@thompson# cd .. | ~/x ~/x/mnt | | root@thompson# umount mnt | | root@thompson# fsck /dev/md1 | ** /dev/md1 | ** Last Mounted on /root/x/mnt | ** Phase 1 - Check Blocks and Sizes | INODE 4: FILE SIZE 9663676605 BEYOND END OF ALLOCATED FILE, SIZE SHOULD BE 1342210048 | ADJUST? [yn] y | | ** Phase 2 - Check Pathnames | ** Phase 3 - Check Connectivity | ** Phase 4 - Check Reference Counts | ** Phase 5 - Check Cyl groups | 4 files, 163 used, 507620 free (20 frags, 63450 blocks, 0.0% fragmentation) | | ***** FILE SYSTEM IS CLEAN ***** | | ***** FILE SYSTEM WAS MODIFIED ***** | | root@thompson# fsck /dev/md1 | ** /dev/md1 | ** Last Mounted on /root/x/mnt | ** Phase 1 - Check Blocks and Sizes | PARTIALLY TRUNCATED INODE I=4 | SALVAGE? [yn] y | | INCORRECT BLOCK COUNT I=4 (1280 should be 256) | CORRECT? [yn] y | | INODE 4: FILE SIZE 1342210048 BEYOND END OF ALLOCATED FILE, SIZE SHOULD BE 268468224 | ADJUST? [yn] y | | ** Phase 2 - Check Pathnames | ** Phase 3 - Check Connectivity | ** Phase 4 - Check Reference Counts | ** Phase 5 - Check Cyl groups | FREE BLK COUNT(S) WRONG IN SUPERBLK | SALVAGE? [yn] y | | SUMMARY INFORMATION BAD | SALVAGE? [yn] y | | BLK(S) MISSING IN BIT MAPS | SALVAGE? [yn] y | | 4 files, 35 used, 507748 free (20 frags, 63466 blocks, 0.0% fragmentation) | | ***** FILE SYSTEM IS CLEAN ***** | | ***** FILE SYSTEM WAS MODIFIED ***** | | root@thompson# fsck /dev/md1 | ** /dev/md1 | ** Last Mounted on /root/x/mnt | ** Phase 1 - Check Blocks and Sizes | PARTIALLY TRUNCATED INODE I=4 | SALVAGE? [yn] y | | INCORRECT BLOCK COUNT I=4 (256 should be 128) | CORRECT? [yn] y | | INODE 4: FILE SIZE 268468224 BEYOND END OF ALLOCATED FILE, SIZE SHOULD BE 134610944 | ADJUST? [yn] y | | ** Phase 2 - Check Pathnames | ** Phase 3 - Check Connectivity | ** Phase 4 - Check Reference Counts | ** Phase 5 - Check Cyl groups | FREE BLK COUNT(S) WRONG IN SUPERBLK | SALVAGE? [yn] y | | SUMMARY INFORMATION BAD | SALVAGE? [yn] y | | BLK(S) MISSING IN BIT MAPS | SALVAGE? [yn] y | | 4 files, 19 used, 507764 free (20 frags, 63468 blocks, 0.0% fragmentation) | | ***** FILE SYSTEM IS CLEAN ***** | | ***** FILE SYSTEM WAS MODIFIED ***** | | root@thompson# fsck /dev/md1 | ** /dev/md1 | ** Last Mounted on /root/x/mnt | ** Phase 1 - Check Blocks and Sizes | ** Phase 2 - Check Pathnames | ** Phase 3 - Check Connectivity | ** Phase 4 - Check Reference Counts | ** Phase 5 - Check Cyl groups | 4 files, 19 used, 507764 free (20 frags, 63468 blocks, 0.0% fragmentation) | | ***** FILE SYSTEM IS CLEAN ***** | | root@thompson# fsck /dev/md1 | ** /dev/md1 | ** Last Mounted on /root/x/mnt | ** Phase 1 - Check Blocks and Sizes | ** Phase 2 - Check Pathnames | ** Phase 3 - Check Connectivity | ** Phase 4 - Check Reference Counts | ** Phase 5 - Check Cyl groups | 4 files, 19 used, 507764 free (20 frags, 63468 blocks, 0.0% fragmentation) | | ***** FILE SYSTEM IS CLEAN ***** | | root@thompson# mount /dev/md1 mnt | | root@thompson# cd mnt/ | ~/x/mnt ~/x | | root@thompson# l | total 80 | 4 drwxr-xr-x 3 root wheel - 512 11 Apr 04:14 ./ | 4 drwxr-x--- 3 root wheel - 512 11 Apr 04:09 ../ | 4 drwxrwxr-x 2 root operator - 512 11 Apr 04:09 .snap/ | 4 -rw-r----- 1 root wheel - 70 11 Apr 04:14 sha256.out | 64 -rw-r----- 1 root wheel - 134,610,944 11 Apr 04:14 test | | root@thompson# cat sha256.out | 76b042e7fbb3ed1914cf600a0b5ed8e10b8d917a006dbbff774a996c9bbce941 test | | root@thompson# sha256 -r test | 6b1a548d057244632b5d2897f8c17177236c262c6af54cc0a9db5ddc8285fbd4 test
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