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    SubjectRe: 2.6.17-rc5-mm2 md cause BUGs, and readahead speedup
    The good stuff first, bootup went from 55s to 43s according to 
    bootchart. :-)
    Probably the readahead stuff.

    I got some BUG messages in dmesg though, they
    seem related to md initialization:

    Freeing unused kernel memory: 236k freed
    md: Autodetecting RAID arrays.
    BUG: warning at fs/block_dev.c:944/do_open()
    <c015748d> do_open+0x2e8/0x2ed <c025d905> cfb_imageblit+0x85/0x550
    <c02537e9> soft_cursor+0x13d/0x1a4 <c0166446> iget5_locked+0xe6/0x14e
    <c0157668> bdev_test+0x0/0xc <c0156aec> bdget+0xd6/0xde
    <c015763d> open_partition_by_devnum+0x69/0x7c <c034dcfa>
    md_import_device+0x78/0x24b
    <c023aedc> kobject_register+0x30/0x35 <c034cdf3> md_probe+0x12e/0x16b
    <c03506ef> md_ioctl+0x27a/0x154b <c034f857> md_open+0x48/0x4f
    <c01573d2> do_open+0x22d/0x2ed <c015c659> do_lookup+0x47/0x126
    <c02a84f4> scrup+0xca/0xd4 <c016422f> dput+0xba/0x177
    <c015cee9> __link_path_walk+0x7b1/0xc37 <c0252d37> bit_cursor+0x34d/0x5c3
    <c01674a0> mntput_no_expire+0x13/0x52 <c0350475> md_ioctl+0x0/0x154b
    <c023413c> blkdev_driver_ioctl+0x42/0x44 <c02343a9>
    blkdev_ioctl+0x242/0x759
    <c0166446> iget5_locked+0xe6/0x14e <c0157668> bdev_test+0x0/0xc
    <c0156aec> bdget+0xd6/0xde <c0157674> bdev_set+0x0/0x8
    <c0157492> blkdev_open+0x0/0x4c <c01574ae> blkdev_open+0x1c/0x4c
    <c014fb0c> __dentry_open+0xe4/0x1a3 <c014fc58> nameidata_to_filp+0x31/0x3a
    <c014fc9a> do_filp_open+0x39/0x40 <c0156907> block_ioctl+0x18/0x1d
    <c01568ef> block_ioctl+0x0/0x1d <c015f5c9> do_ioctl+0x19/0x55
    <c015f657> vfs_ioctl+0x52/0x247 <c015f880> sys_ioctl+0x34/0x50
    <c0468027> syscall_call+0x7/0xb <c046007b> sctp_getsockopt+0x7a0/0x147f
    BUG: warning at fs/block_dev.c:944/do_open()
    <c015748d> do_open+0x2e8/0x2ed <c02ec589> ide_do_request+0x6c2/0x894
    <c0237dd7> cfq_insert_request+0x6b/0x4a5 <c0230fa3>
    blk_remove_plug+0x25/0x5c
    <c023100b> __generic_unplug_device+0x1f/0x25 <c0233e63>
    __make_request+0x108/0x395
    <c0166446> iget5_locked+0xe6/0x14e <c0157668> bdev_test+0x0/0xc
    <c0156aec> bdget+0xd6/0xde <c015763d> open_partition_by_devnum+0x69/0x7c
    <c034dcfa> md_import_device+0x78/0x24b <c023aedc>
    kobject_register+0x30/0x35
    <c034cdf3> md_probe+0x12e/0x16b <c03506ef> md_ioctl+0x27a/0x154b
    <c034f857> md_open+0x48/0x4f <c01573d2> do_open+0x22d/0x2ed
    <c015c659> do_lookup+0x47/0x126 <c02a84f4> scrup+0xca/0xd4
    <c016422f> dput+0xba/0x177 <c015cee9> __link_path_walk+0x7b1/0xc37
    <c0252d37> bit_cursor+0x34d/0x5c3 <c01674a0> mntput_no_expire+0x13/0x52
    <c0350475> md_ioctl+0x0/0x154b <c023413c> blkdev_driver_ioctl+0x42/0x44
    <c02343a9> blkdev_ioctl+0x242/0x759 <c0166446> iget5_locked+0xe6/0x14e
    <c0157668> bdev_test+0x0/0xc <c0156aec> bdget+0xd6/0xde
    <c0157674> bdev_set+0x0/0x8 <c0157492> blkdev_open+0x0/0x4c
    <c01574ae> blkdev_open+0x1c/0x4c <c014fb0c> __dentry_open+0xe4/0x1a3
    <c014fc58> nameidata_to_filp+0x31/0x3a <c014fc9a> do_filp_open+0x39/0x40
    <c0156907> block_ioctl+0x18/0x1d <c01568ef> block_ioctl+0x0/0x1d
    <c015f5c9> do_ioctl+0x19/0x55 <c015f657> vfs_ioctl+0x52/0x247
    <c015f880> sys_ioctl+0x34/0x50 <c0468027> syscall_call+0x7/0xb
    <c046007b> sctp_getsockopt+0x7a0/0x147f
    md: autorun ...
    md: considering hdb1 ...
    .
    .
    .
    hda: cache flushes not supported
    hdb: cache flushes not supported
    md: md_d0 stopped.
    BUG: warning at fs/block_dev.c:944/do_open()
    <c015748d> do_open+0x2e8/0x2ed <c0238ea7> cfq_set_request+0x1d3/0x33f
    <c0237dd7> cfq_insert_request+0x6b/0x4a5 <c022ffe4> elv_insert+0xdd/0x142
    <c0154561> bio_phys_segments+0x14/0x16 <c0233e49>
    __make_request+0xee/0x395
    <c016598b> find_inode+0x37/0x61 <c01661ce> ifind+0x29/0x61
    <c01663bc> iget5_locked+0x5c/0x14e <c0157668> bdev_test+0x0/0xc
    <c0156a4c> bdget+0x36/0xde <c015763d> open_partition_by_devnum+0x69/0x7c
    <c034dcfa> md_import_device+0x78/0x24b <c04664f8> schedule+0x2a2/0x5ef
    <c01663bc> iget5_locked+0x5c/0x14e <c035162f> md_ioctl+0x11ba/0x154b
    <c0231000> __generic_unplug_device+0x14/0x25 <c0466853>
    io_schedule+0xe/0x16
    <c0132a5f> find_get_pages_tag+0x27/0x66 <c0350475> md_ioctl+0x0/0x154b
    <c023413c> blkdev_driver_ioctl+0x42/0x44 <c02343a9>
    blkdev_ioctl+0x242/0x759
    <c013a42a> release_pages+0x2a/0x175 <c0132990> find_get_pages+0x19/0x49
    <c0467089> mutex_lock+0xb/0x1a <c02f46dc> ide_disk_put+0x1c/0x27
    <c02f52bd> idedisk_release+0x45/0xc6 <c0165383> iput+0x35/0x62
    <c0156f14> __blkdev_put+0x77/0x187 <c0165383> iput+0x35/0x62
    <c0156f84> __blkdev_put+0xe7/0x187 <c0156907> block_ioctl+0x18/0x1d
    <c01568ef> block_ioctl+0x0/0x1d <c015f5c9> do_ioctl+0x19/0x55
    <c015f657> vfs_ioctl+0x52/0x247 <c015f880> sys_ioctl+0x34/0x50
    <c0467fbd> sysenter_past_esp+0x56/0x79
    md: bind<hdb2>
    raid1: raid set md_d0 active with 1 out of 2 mirrors

    The machine seems to work fine. (That degraded array
    is degraded on purpose.)

    Helge Hafting
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