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    SubjectRe: 2.6.15-mm2


    On 12/01/2006 12:56 a.m., Jens Axboe wrote:
    > On Thu, Jan 12 2006, Reuben Farrelly wrote:
    >>
    >> On 12/01/2006 12:13 a.m., Jens Axboe wrote:
    >>> On Wed, Jan 11 2006, Andrew Morton wrote:
    >>>> Neil thinks that an IO got lost. In the git2->git3 diff we have:
    >>>>
    >>>> b/drivers/scsi/Kconfig | 10
    >>>> b/drivers/scsi/ahci.c | 1
    >>>> b/drivers/scsi/ata_piix.c | 5
    >>>> b/drivers/scsi/libata-core.c | 145 +
    >>>> b/drivers/scsi/libata-scsi.c | 48
    >>>> b/drivers/scsi/libata.h | 4
    >>>> b/drivers/scsi/sata_mv.c | 1
    >>>> b/drivers/scsi/sata_promise.c | 1
    >>>> b/drivers/scsi/sata_sil.c | 1
    >>>> b/drivers/scsi/sata_sil24.c | 1
    >>>> b/drivers/scsi/sata_sx4.c | 1
    >>>> b/drivers/scsi/scsi_lib.c | 50
    >>>> b/drivers/scsi/scsi_sysfs.c | 31
    >>>> b/drivers/scsi/sd.c | 85 -
    >>>> b/fs/bio.c | 26
    >>>>
    >>>> Jens, Jeff: were any of those changes added in the final day or two, not
    >>>> included in the trees which I pull?
    >>> Reuben, do you have any barrier= options in your fstab for any reiser
    >>> file system?
    >> None whatsoever:
    >>
    >> /dev/md0 / reiserfs defaults 0 0
    >> none /dev/pts devpts gid=5,mode=620 0 0
    >> none /dev/shm tmpfs defaults 0 0
    >> none /proc proc defaults 0 0
    >> sysfs /sys sysfs defaults 0 0
    >> /dev/sda1 /boot ext3 defaults 1 2
    >> #/dev/sdb1 /boot-2 ext3 defaults 1 2
    >> /dev/md1 /home reiserfs defaults 0 0
    >> /dev/md2 /var reiserfs defaults 0 0
    >> /dev/md3 /var/www/cgi-bin reiserfs defaults 0 0
    >> /dev/md4 /tmp reiserfs defaults 0 0
    >> /dev/md5 /backup reiserfs defaults 0 0
    >> /dev/sda8 /var/spool/squid-1 reiserfs noatime,notail 0 0
    >> /dev/sdb8 /var/spool/squid-2 reiserfs noatime,notail 0 0
    >> /dev/sda9 swap swap defaults 0 0
    >> /dev/sdb9 swap swap defaults 0 0
    >> /dev/sdc1 /store reiserfs defaults 0 0
    >> /dev/shm /var/spool/amavisd/tmp tmpfs
    >> defaults,size=25m,mode=700,uid=508,gid=509, 0 0
    >> /dev/fd0 /media/floppy auto
    >> pamconsole,exec,noauto,managed 0 0
    >
    > Then the barrier changes from git2 -> git3 should not have anything to
    > do with it. Strange... I guess you should try the git bisect method to
    > narrow it down.

    Ok push came to shove, so I spent the evening (early hours of the morning
    really) learning how to git my way around a little and use git bisect. Not bad,
    people who come up with clever stuff like that would probably be clever enough
    to be able to do kernel development or something ;-)

    Anyway, humour aside, I've bisected down to six revisions:

    [root@tornado linux-2.6]# git bisect good
    Bisecting: 6 revisions left to test after this
    [93c9338713d4e11102cd09b4670ad42a336b06a3] [BLOCK] update libata to use new
    blk_ordered for barriers
    [root@tornado linux-2.6]#

    however I'm not sure I can go a lot further now as the tree is failing to
    compile at that point:

    include/asm/mpspec_def.h:78: warning: 'packed' attribute ignored for field of
    type 'unsigned char[5u]'
    block/ll_rw_blk.c:2421: error: conflicting types for 'blk_execute_rq_nowait'
    include/linux/blkdev.h:617: error: previous declaration of
    'blk_execute_rq_nowait' was here
    make[1]: *** [block/ll_rw_blk.o] Error 1
    make: *** [block] Error 2
    [root@tornado linux-2.6]#

    I'm guessing there are a block of changes that all go together around this point.

    Here's my BISECT_LOG:

    git-bisect start
    # bad: [0aec63e67c69545ca757a73a66f5dcf05fa484bf] Fix posix-cpu-timers
    sched_time accumulation
    git-bisect bad 0aec63e67c69545ca757a73a66f5dcf05fa484bf
    # good: [2e3e13f8e9d9b2111404cdccaa4e1b988b70acce] i2c: i2c-i801 explicitly
    enables/disables PEC
    git-bisect good 2e3e13f8e9d9b2111404cdccaa4e1b988b70acce
    # good: [9bbc8346fb21fad3f678220b067450e436e45dbf] s390: fix invalid return code
    in sclp_cpi
    git-bisect good 9bbc8346fb21fad3f678220b067450e436e45dbf
    # bad: [221fc10ec89834329e5613e3cab4569ba22da410] fs/ufs: debug mode compilation
    failure
    git-bisect bad 221fc10ec89834329e5613e3cab4569ba22da410
    # good: [ddaf22abaa831763e75775e6d4c7693504237997] md: attempt to auto-correct
    read errors in raid1
    git-bisect good ddaf22abaa831763e75775e6d4c7693504237997
    # good: [d9d166c2a9d5d01af34396793950aa695883eed4] md: allow array level to be
    set textually via sysfs
    git-bisect good d9d166c2a9d5d01af34396793950aa695883eed4
    # bad: [e650c305ec3178818b317dad37a6d9c7fa8ba28d] [SCSI] scsi_end_async() needs
    to take an uptodate parameter
    git-bisect bad e650c305ec3178818b317dad37a6d9c7fa8ba28d
    # good: [64100099ed22f71cce656c5c2caecf5c9cf255dc] [BLOCK] mark some block/
    variables cons
    git-bisect good 64100099ed22f71cce656c5c2caecf5c9cf255dc

    I'll leave the setup as it is right now so if there's an easy way to narrow it
    down even further I can continue tomorrow.

    Incidentally, I also tested - the problem is still in -mm3 also.

    reuben



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