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    SubjectRe: PROBLEM: kernel BUG at mm/slab.c:3002!
    Alan D. Brunelle wrote:
    > Running blktrace & I/O loads cause a kernel BUG at mm/slab.c:3002!.
    >
    > I'm running some moderate I/O loads (using 12 devices behind a Smart
    > Array on a 16-way x86_64 box, I'm doing asynchronous direct sequential
    > reads to each disk in parallel), and whilst attempting to get blktrace
    > data I routinely run into this.
    >
    > I first started seeing this in 2.6.29-rc6, so I bumped to 2.6.29-rc7 and
    > made a couple of successful runs, then ran into it again. (I've
    > attached the script I was using, but I'm not sure it's very helpful...)
    >
    > The environment the system under test is in is rather difficult to
    > bisect in, but if need be, I can certainly go through the (painful)
    > motions to do so...
    >
    > I only ran this a couple of times on 2.6.27.7-4 (SLESS 11 b6 kernel),
    > and both times it worked there - not sure how far back the problem occurs...
    >
    > I'm open to any SLAB debug tracing options that may help with this...
    >
    > Alan D.Brunelle
    > Hewlett-Packard
    >

    Hm, it isn't SLAB-related: reconfigured w/ SLUB and got:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000030g
    IP: [<ffffffff802d0fda>] deactivate_super+0x11/0x8cg
    PGD 1867047067 PUD 1853074067 PMD 0 g
    Oops: 0000 [#1] SMP g
    last sysfs file:
    /sys/devices/pci0000:40/0000:40:10.0/0000:41:02.0/local_cpusg
    CPU 15 g
    Modules linked in: xfs exportfs fuse ext2 loop dm_mod sd_mod crc_t10dif
    qla2xxx sg bnx2 scsi_transport_fc rtc_cmos sr_mod ipmi_si rtc_core
    pcspkr ipmi_msghandler hpwdt hpilo container shpchp serio_raw scsi_tgt
    rtc_lib button cdrom pci_hotplug usbhid hid uhci_hcd ohci_hcd ehci_hcd
    usbcore edd ext3 mbcache jbd fan ide_pci_generic amd74xx ide_core
    pata_amd thermal processor thermal_sys hwmon cciss ata_generic libata
    scsi_modg
    Pid: 12527, comm: blktrace Not tainted 2.6.29-rc7 #4 ProLiant DL585 G5 g
    RIP: 0010:[<ffffffff802d0fda>] [<ffffffff802d0fda>]
    deactivate_super+0x11/0x8cg
    RSP: 0018:ffff88087a4e1b38 EFLAGS: 00010246g
    RAX: ffff881829debf00 RBX: 0000000000000000 RCX: 00000000fffffffeg
    RDX: 0000000000000d74 RSI: ffffffff80ab4b00 RDI: 0000000000000000g
    RBP: ffff88087a4e1b48 R08: 0000000000000000 R09: 0000000000000000g
    R10: ffff88107cc3d760 R11: ffff88187b84deb8 R12: ffff881829debf00g
    R13: 0000000000000200 R14: ffffffff809a7d00 R15: ffff881829debfd8g
    FS: 00007fab4778f6f0(0000) GS:ffff88207c202380(0000)
    knlGS:0000000000000000g
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003bg
    CR2: 0000000000000030 CR3: 0000001801474000 CR4: 00000000000006e0g
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000g
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400g
    Process blktrace (pid: 12527, threadinfo ffff88087a4e0000, task
    ffff880821e70000)g
    Stack:g
    ffff88189c255d00 ffff881829debf00 ffff88087a4e1b88 ffffffff802e4f22g
    0000000000000000 ffffffff80ab82b8 ffffffff80ab82b0 ffff881829debf00g
    ffff8820798f6148 0000000000000016 ffff88087a4e1bb8 ffffffff802e8faeg
    Call Trace:g
    [<ffffffff802e4f22>] mntput_no_expire+0x144/0x18fg
    [<ffffffff802e8fae>] simple_release_fs+0x68/0x70g
    [<ffffffff8032cd10>] debugfs_remove+0x5b/0x60g
    [<ffffffff80289c02>] ? relay_remove_buf+0x0/0x2cg
    [<ffffffff8036c255>] blk_remove_buf_file_callback+0x1a/0x20g
    [<ffffffff80289c21>] relay_remove_buf+0x1f/0x2cg
    [<ffffffff8037155d>] kref_put+0x4b/0x57g
    [<ffffffff80289c85>] relay_close_buf+0x35/0x3ag
    [<ffffffff8028a08c>] relay_close+0x5e/0xecg
    [<ffffffff8036ca9f>] blk_trace_remove+0x50/0x1e3g
    [<ffffffff8036cd0f>] blk_trace_ioctl+0xb3/0xcfg
    [<ffffffffa03aa4c5>] ? xfs_write+0x6c8/0x6e3 [xfs]g
    [<ffffffff80363d78>] blkdev_ioctl+0x803/0x853g
    [<ffffffff804b1100>] ? _spin_lock+0x17/0x1ag
    [<ffffffff803702ac>] ? kobject_put+0x47/0x4bg
    [<ffffffff803f6e38>] ? put_device+0x15/0x17g
    [<ffffffffa000017a>] ? scsi_device_put+0x3d/0x42 [scsi_mod]g
    [<ffffffffa0312bcb>] ? scsi_disk_put+0x3a/0x3f [sd_mod]g
    [<ffffffff802f30a3>] block_ioctl+0x38/0x3cg
    [<ffffffff802db638>] vfs_ioctl+0x2a/0x78g
    [<ffffffff802dbacc>] do_vfs_ioctl+0x446/0x482g
    [<ffffffff802cfc80>] ? __fput+0x18c/0x199g
    [<ffffffff802dbb5d>] sys_ioctl+0x55/0x77g
    [<ffffffff8020c42a>] system_call_fastpath+0x16/0x1bg
    Code: 48 8b 7f 68 48 85 ff 74 05 e8 45 cb 00 00 48 89 df e8 8d ff ff ff
    5b 5b c9 c3 55 48 c7 c6 00 4b ab 80 48 89 e5 41 54 53 48 89 fb <4c> 8b
    67 30 48 8d bf a8 00 00 00 e8 0a de 09 00 85 c0 74 62 81 g
    RIP [<ffffffff802d0fda>] deactivate_super+0x11/0x8cg
    RSP <ffff88087a4e1b38>g
    CR2: 0000000000000030g


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