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    SubjectRe: 2.6.18-rc3-mm2 [oops: shrink_dcache_for_umount_subtree ?]


    On 6/08/2006 10:08 p.m., Andrew Morton wrote:
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc3/2.6.18-rc3-mm2/
    >
    > - 2.6.18-rc3-mm1 gets mysterious udev timeouts during boot and crashes in
    > NFS. This kernel reverts the patches which were causing that.

    Just hit this one upon shutdown (no traces logged before then):

    INIT: Sending processes the TERM signal
    INITStopping clamd: [FAILED]
    Starting killall: Stopping clamd: [FAILED]
    [ OK ]
    Sending all processes the TERM signal...
    Sending all processes the KILL signal...
    Saving random seed:
    Syncing hardware clock to system time
    Turning off swap:
    Unmounting file systems: umount2: Device or resource busy
    umount: /var/www/html: device is busy
    umount2: Device or resource busy
    umount: /var/www/html: device is busy
    BUG: Dentry ffff81003d0f34f0{i=3,n=.reiserfs_priv} still in use (1) [unmount of
    reiserfs sdc8]
    ----------- [cut here ] --------- [please bite here ] ---------
    Kernel BUG at fs/dcache.c:611
    invalid opcode: 0000 [1] SMP
    last sysfs file:
    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/bInterfaceProtocol
    CPU 0
    Modules linked in: ipv6 ip_gre binfmt_misc i2c_i801 iTCO_wdt serio_raw
    Pid: 22715, comm: umount Not tainted 2.6.18-rc3-mm2 #1
    RIP: 0010:[<ffffffff802ce943>] [<ffffffff802ce943>]
    shrink_dcache_for_umount_subtree+0x1a3/0x2a7
    RSP: 0018:ffff81002ec6fd98 EFLAGS: 00010292
    RAX: 0000000000000062 RBX: ffff81003d0f34f0 RCX: 0000000000000003
    RDX: 0000000000000008 RSI: ffff810035224740 RDI: ffff810035224040
    RBP: ffff81002ec6fdb8 R08: 0000000000000001 R09: 0000000000000001
    R10: ffffffff80216800 R11: 0000000000000000 R12: ffff81003d0f34f0
    R13: ffff8100025b2ce8 R14: ffff81002f936d30 R15: 0000000000000000
    FS: 00002b532ecdd4b0(0000) GS:ffffffff808b5000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00002b532ecd0000 CR3: 000000003273e000 CR4: 00000000000006e0
    Process umount (pid: 22715, threadinfo ffff81002ec6e000, task ffff810035224040)
    Stack: ffff81003d29c980 ffff81003d29c588 ffffffff80595640 ffff81002ec6fea8
    ffff81002ec6fdd8 ffffffff802ceea9 ffffffff805955e0 ffff81003d29c588
    ffff81002ec6fe08 ffffffff802c6944 ffff81002f936d30 ffff81003e99e2c0
    Call Trace:
    [<ffffffff802ceea9>] shrink_dcache_for_umount+0x37/0x6e
    [<ffffffff802c6944>] generic_shutdown_super+0x24/0x151
    [<ffffffff802c6a97>] kill_block_super+0x26/0x3b
    [<ffffffff802c6b65>] deactivate_super+0x4c/0x67
    [<ffffffff8022d061>] mntput_no_expire+0x58/0x92
    [<ffffffff80232562>] path_release_on_umount+0x1d/0x2b
    [<ffffffff802d1182>] sys_umount+0x252/0x29b
    [<ffffffff8025f45e>] system_call+0x7e/0x83
    DWARF2 unwinder stuck at system_call+0x7e/0x83
    Leftover inexact backtrace:


    Code: 0f 0b 68 c9 47 4c 80 c2 63 02 4c 8b 63 50 49 39 dc 75 05 45
    RIP [<ffffffff802ce943>] shrink_dcache_for_umount_subtree+0x1a3/0x2a7
    RSP <ffff81002ec6fd98>
    /etc/rc6.d/S01reboot: line 14: 22715 Segmentation fault "$@"

    /var/www/html: c
    /var: mcm
    Unmounting file systems (retry):<3>BUG: Dentry
    ffff81003ef61e80{i=3,n=.reiserfs_priv} still in use (1) [unmount of reiserfs sda8]
    umount2: Devic----------- [cut here ] --------- [please bite here ] ---------
    Kernel BUG at fs/dcache.c:611
    invalid opcode: 0000 [2] SMP
    last sysfs file:
    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/bInterfaceProtocol
    CPU 1
    Modules linked in: ipv6 ip_gre binfmt_misc i2c_i801 iTCO_wdt serio_raw
    Pid: 22722, comm: umount Not tainted 2.6.18-rc3-mm2 #1
    RIP: 0010:[<ffffffff802ce943>] e or resource bu [<ffffffff802ce943>]
    shrink_dcache_for_umount_subtree+0x1a3/0x2a7
    RSP: 0018:ffff810027e1dd98 EFLAGS: 00010292
    RAX: 0000000000000062 RBX: ffff81003ef61e80 RCX: 0000000000000000
    sy
    umount: /varRDX: ffff810015f99140 RSI: 0000000000000001 RDI: 0000000000000000
    RBP: ffff810027e1ddb8 R08: 0000000000000002 R09: 0000000000000001
    R10: ffffffff80216800 R11: 0000000000000001 R12: ffff81003ef61e80
    /www/html: devicR13: ffff8100131f3648 R14: ffff81002f936e18 R15: 0000000000000000
    FS: 00002b52520af4b0(0000) GS:ffff81003f6eb430(0000) knlGS:0000000000000000
    e is busy
    umounCS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00007fff58a02ea0 CR3: 000000002ec49000 CR4: 00000000000006e0
    t2: Device or reProcess umount (pid: 22722, threadinfo ffff810027e1c000, task
    ffff810015f99140)
    Stack: ffff81003d29d198 ffff81003d29cda0 ffffffff80595640 ffff810027e1dea8
    ffff810027e1ddd8 ffffffff802ceea9 ffffffff805955e0 ffff81003d29cda0
    ffff810027e1de08 ffffffff802c6944 ffff81002f936e18 ffff81003ebaa938
    Call Trace:
    source busy
    umo [<ffffffff802ceea9>] shrink_dcache_for_umount+0x37/0x6e
    unt: /var/www/ht [<ffffffff802c6944>] generic_shutdown_super+0x24/0x151
    ml: device is bu [<ffffffff802c6a97>] kill_block_super+0x26/0x3b
    sy
    [<ffffffff802c6b65>] deactivate_super+0x4c/0x67
    [<ffffffff8022d061>] mntput_no_expire+0x58/0x92
    [<ffffffff80232562>] path_release_on_umount+0x1d/0x2b
    [<ffffffff802d1182>] sys_umount+0x252/0x29b
    [<ffffffff8025f45e>] system_call+0x7e/0x83
    DWARF2 unwinder stuck at system_call+0x7e/0x83
    Leftover inexact backtrace:


    Code: 0f 0b 68 c9 47 4c 80 c2 63 02 4c 8b 63 50 49 39 dc 75 05 45
    RIP [<ffffffff802ce943>] shrink_dcache_for_umount_subtree+0x1a3/0x2a7
    RSP <ffff810027e1dd98>
    /etc/rc6.d/S01reboot: line 14: 22722 Segmentation fault "$@"

    /var/www/html: c
    /var: mcm

    Yes, there are bits of the shutdown mixed in which doesn't really help readability.

    The reason I shut the box down was due to yum hanging and becoming a 'D' process
    which was unkillable.

    What is strange is that /var/www/html should not be busy as there are no mounts
    underneath it. It's just a standard ext3 partition.

    [root@tornado ~]# mount
    /dev/md0 on / type ext3 (rw)
    none on /proc type proc (rw)
    sysfs on /sys type sysfs (rw)
    none on /dev/pts type devpts (rw,gid=5,mode=620)
    none on /dev/shm type tmpfs (rw)
    /dev/sda1 on /boot type ext3 (rw)
    /dev/md1 on /home type ext3 (rw)
    /dev/md2 on /var type ext3 (rw)
    /dev/md3 on /var/www/html type ext3 (rw)
    /dev/md4 on /var/www/cgi-bin type ext3 (rw)
    /dev/md5 on /store type ext3 (rw)
    /dev/sda8 on /var/spool/squid-1 type reiserfs (rw,noatime,notail)
    /dev/sdc8 on /var/spool/squid-2 type reiserfs (rw,noatime,notail)
    /dev/sda9 on /tmp type ext3 (rw)
    /dev/shm on /var/spool/amavisd/tmp type tmpfs (rw,size=25m,mode=700,uid=101,gid=511)
    none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
    [root@tornado ~]#

    Looks identical to
    http://www.uwsg.iu.edu/hypermail/linux/kernel/0606.3/2802.html which hasn't
    appeared since then. I remember it was reproduceable at the time, but
    disappeared for a while and just came back before..

    Reuben



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