Date:	Tue, 24 May 2011 13:17:57 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Problem found in punch patch series

On 5/24/2011 12:18 PM, Theodore Ts'o wrote:
> Hi Allison,
>
> I was finally able to track down the source of the regression with a
> stable repro case, and a git bisect pointed at this commit:
>
> b1235954684b05c945ab08defe1547b8ffa1a759 is the first bad commit
> commit b1235954684b05c945ab08defe1547b8ffa1a759
> Author: Allison Henderson<achender@...ux.vnet.ibm.com>
> Date:   Mon May 16 16:04:13 2011 -0400
>
>      ext4: add support for "hole punch" out in the truncate routines for extents
>
>      This patch modifies the truncate routines to support hole punching
>      Below is a brief summary of the patches changes:
>
>      - Added end param to ext_ext4_rm_leaf
>              This function has been modified to accept an end parameter
>              which enables it to punch holes in leafs instead of just
>              truncating them.
>
>      - Implemented the "remove head" case in the ext_remove_blocks routine
>              This routine is used by ext_ext4_rm_leaf to remove the tail
>              of an extent during a truncate.  The new ext_ext4_rm_leaf
>              routine will now also use it to remove the head of an extent in the
>              case that the hole covers a region of blocks at the beginning
>              of an extent.
>
>      - Added "end" param to ext4_ext_remove_space routine
>              This function has been modified to accept a stop parameter, which
>              is passed through to ext4_ext_rm_leaf.
>
>      [ext4 punch hole patch series 3/5 v7]
>
>      Signed-off-by: Allison Henderson<achender@...ibm.com>
>      Signed-off-by: "Theodore Ts'o"<tytso@....edu>
>      Reviewed-by: Mingming Cao<cmm@...ibm.com>
>
> (This commit can be found on the dev-save branch of ext4.git).
>
> Here's the reproduction information.  Use the following[1] as the image
> for TEST_DEV for xfstests, and run xfstests #213.  You will get a
> message indicating that the file system was corrupted after the test
> completes.
>
> [1]  ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/ext4-testcases/test-4k-213-bug-report.img.bz2
>
> In case this is significant, I was running my kernels under KVM, using
> the following parameters:
>
> /usr/local/bin/qemu-system-x86_64 -boot order=c \
> 	-drive file=/kbuild/root_fs.img,if=virtio \
> 	-drive file=/dev/funarg/test-4k,cache=none,if=virtio \
> 	-drive file=/dev/funarg/big-scratch,cache=none,if=virtio \
> 	-drive file=/dev/funarg/test-1k,cache=none,if=virtio \
> 	-serial telnet::4445,server -smp 2 -m 1024 \
> 	--kernel /kbuild/ext4/arch/x86/boot/bzImage \
> 	--append "root=fe00 console=ttyS0,115200 console=tty0"&
> sleep 0.5
> exec xterm -e script -c "telnet 127.0.0.1 4445" /tmp/kvm-console&
>
> The file system corruption is quite distinctive; I will attach it at the
> end of this message.
>
> What to do --- what I am currently thinking about doing is to drop
> patches 3/5, 4/5, and 5/5 from the punch series, since we're running out
> of time in this short merge window.  I've already tried building a patch
> series with these patches dropped, and (a) none of the patches needed
> modification, and (b) this problem disappeared.  So it seems pretty
> clear it's a problem with patch 3/5 in the punch patch series.
>
> If we can figure out what is going quickly, we can try to add revised
> patches back to the merge window.  Does that sound fair?
>
> 						- Ted
>
> e2fsck 1.41.14 (22-Dec-2010)
> Pass 1: Checking inodes, blocks, and sizes
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> Block bitmap differences:  -(8562--8595) -(8606--8615) -(8620--8839) -(8852--8874) -(8888--8919) -(8929--8959) -(8986--8999) -(9008--9208) -(9236--9246) -(9260--9373) -(33090--33091) -(33218--33223) -(33246--33247) -(33280--33283) -(33300--33303) -(33348--33349) -(33454--33455) -(33516--33517) -(33528--33529) -(33582--33583) -(33615--33621) -(33628--33633) -(33665--33666) -(33670--33671) -(33680--33684) -(33710--33717) -(33752--33759) -(33807--33809) -(33857--33858) -33882 -(33952--33956) -(34034--34035) -34090 -(34105--34126) -(34157--34167) -34175 -(34192--34194) -(34207--34209) -(34233--34240) -(34252--34282) -(34302--34303) -(34368--34404) -(34435--34436) -(34462--34495) -(34560--34577) -(34611--34667) -(34696--34730) -(34754--34801) -(34807--34822) -(34842--34898) -(34926--34973) -(34978--35054) -35056 -(35082--35106) -(35124--35191) -(35201--35252) -(35266--35348) -(35359--35397) -(35413--35461) -(35466--35536) -(35560--35589) -(35601--35627) -(35646--35681) -(35711-
-3!
>   5754) -(35776--35780) -(35782--35862) -(35866--35918) -(35927--35990) -(36016--36146) -(36149--36232) -(36243--36293) -(36322--36420) -(36443--36532) -(36560--36579) -(36603--36726) -(36731--36836) -(36853--36987) -(37021--37115) -(37142--37216) -(37269--37301) -(37320--37375) -(37377--37499) -(37505--37579) -(37601--37752) -(37762--37890) -(37895--38027) -(38031--38118) -(38129--38202) -(38264--38287) -(38315--38399) -(38401--38579) -(38581--38714) -(38740--38761) -(38783--38816) -(38822--38975) -(38986--38997) -(39028--39154) -(39173--39243) -(39274--39379) -39393 -(39413--39509) -(39541--39615) -(39622--39729) -(39737--39818) -(39840--39943) -(39974--40083) -(40112--40183) -(40201--40289) -(40316--40383) -(40399--40519) -(40525--40635) -(40640--40671) -(40705--40744) -(40764--40806) -(40812--40982) -(40989--41006) -(41028--41087) -(41096--41332) -(41344--41442) -(41468--41696) -(41717--41848) -(41882--42075) -(42107--42268) -(42298--42661) -(42688--42782) -(42784--429
16)!
>    -(42946--43117) -(43147--43391) -(43398--43631) -(43636--4378!
>   3) -(43815--44031) -(44288--44517) -(44530--44543) -(45492--45765) -(45786--45848) -(45856--45881) -(45899--46095) -(46947--46973) -(46989--47372) -(47380--47407) -(47437--47679) -(47690--48297) -(48318--48400) -(48425--48639) -(65546--65551) -(65578--65579) -(65600--65663) -(65690--65693) -(65727--65741) -65767 -(65789--65841) -(65865--65905) -(65907--65908) -(65951--66007) -(66015--66034) -(66048--66122) -(66136--66144) -(66157--66231) -(66243--66292) -(66323--66393) -(66426--66437) -(66464--66516) -(66532--66576) -(66582--66610) -(66624--66679) -(66684--66706) -(66739--66800) -(66808--66828) -(66832--66897) -(66924--66932) -(66937--66985) -(67015--67108) -(67118--67151) -(67176--67192) -(67209--67337) -(67352--67382) -(67404--67412) -(67414--67521) -(67551--67667) -(67693--67752) -(67776--67901) -(67929--67947) -(67975--67989) -(68017--68055) -(68075--68190) -(68217--68232) -(68252--68268) -(68286--68334) -(68364--68450) -(68470--68600) -(68602--68614) -(68633--68772)
 -(!
>   68800--68824) -(68831--68838) -(68878--69038) -(69059--69135) -(69161--69238) -(69256--69298) -(69314--69377) -(69398--69477) -(69491--69578) -(69610--69750) -(69779--69908) -(69937--70038) -(70044--70084) -(70115--70198) -(70217--70468) -(70494--70869) -(70899--71024) -(98625--163839) -(196608--229375) -(230988--231167) -(231424--294911) -(295233--360437) -(360439--524277) -534050 -534078 -534167 -534180 -(534182--534184) -(534191--557055) -590943 -591071 -597695 -597737 -597781 -(597943--597944) -597988 -598123 -598215 -598240 -598368 -598489 -598647 -598686 -598783 -598838 -598955 -598960 -599103 -(599163--599164) -599315 -599367 -599440 -(599479--599480) -599529 -(599576--599578) -599711 -599808 -(599823--599826) -599839 -(599900--599903) -(599969--599972) -(600041--600043) -600123 -(600260--600262) -(600480--600481) -(600492--600494) -(600523--600525) -(600548--600551) -(600569--600571) -(600607--600609) -(600690--600693) -600750 -600991 -601178 -(601251--601252) -6
013!
>   27 -(601425--601427) -601482 -(601517--601519) -601600 -(601625--601626!
>   ) -(601726--601728) -(601738--601741) -(601756--601767) -(601780--601783) -(601842--601853) -(601868--601886) -(601912--601932) -(601986--601990) -(602122--602124) -(602147--602151) -602335 -(602428--602431) -(602479--602485) -(602715--753653) -(753655--819199) -(819521--884735) -(885057--983029) -(983040--1048575) -(1048584--1048591) -(1048600--1048607) -(1081344--1146869) -(1146871--1310709)
> Fix? yes
>
> Free blocks count wrong for group #0 (23379, counted=24069).
> Fix? yes
>
> Free blocks count wrong for group #1 (18867, counted=29461).
> Fix? yes
>
> Free blocks count wrong for group #2 (27266, counted=31479).
> Fix? yes
>
> Free blocks count wrong for group #3 (0, counted=32447).
> Fix? yes
>
> Free blocks count wrong for group #4 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #6 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #7 (1547, counted=32447).
> Fix? yes
>
> Free blocks count wrong for group #8 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #9 (0, counted=32447).
> Fix? yes
>
> Free blocks count wrong for group #10 (1, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #11 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #12 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #13 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #14 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #15 (10, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #16 (0, counted=22872).
> Fix? yes
>
> Free blocks count wrong for group #18 (0, counted=20068).
> Fix? yes
>
> Free blocks count wrong for group #19 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #20 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #21 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #22 (1, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #23 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #24 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #25 (0, counted=32447).
> Fix? yes
>
> Free blocks count wrong for group #26 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #27 (0, counted=32447).
> Fix? yes
>
> Free blocks count wrong for group #28 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #29 (10, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #30 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #31 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #32 (28640, counted=28656).
> Fix? yes
>
> Free blocks count wrong for group #33 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #34 (1, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #35 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #36 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #37 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #38 (0, counted=32768).
> Fix? yes
>
> Free blocks count wrong for group #39 (10, counted=32768).
> Fix? yes
>
> Free blocks count wrong (132179, counted=1236023).
> Fix? yes
>
>
> /dev/funarg/test-4k: ***** FILE SYSTEM WAS MODIFIED *****
> /dev/funarg/test-4k: 5541/327680 files (2.9% non-contiguous), 74697/1310720 blocks

Hi Ted,

I have recreated the problem and am checking into it now.  Thx!

Allison Henderson

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