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    Subject[BUG] rbtree bug with mmotm 2009-04-14-17-24
    Hi, Andrew,

    I did a quick check on lkml to see if someone reported this issue
    already, I could not find any reports. I am beginning to see several
    of these on my machine. I saw recent refactoring of rbtrees, I've
    cc'ed Wolfram Strepp.


    BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
    IP: [<ffffffff803ba4c8>] rb_erase+0x11f/0x2a7
    PGD 77d1c067 PUD 77c96067 PMD 0
    Oops: 0000 [#1] SMP
    last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
    CPU 2
    Modules linked in: coretemp hwmon kvm_intel kvm usbhid rtc_cmos rtc_core rtc_lib usb_storage ata_piix libata mptsas mptscsih mptbase scsi_transport_sas uhci_hcd ohci_hcd ehci_hcd usbcore
    Pid: 5379, comm: make Not tainted 2.6.30-rc1-mm1-dirty #163 IBM System x3250 -[436482A]-
    RIP: 0010:[<ffffffff803ba4c8>] [<ffffffff803ba4c8>] rb_erase+0x11f/0x2a7
    RSP: 0018:ffff8800640f7838 EFLAGS: 00010006
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88007f1d3bf8
    RDX: ffff88007f1d3bf8 RSI: ffff88007e0208c8 RDI: 0000000000000000
    RBP: ffff8800640f7848 R08: 0000000000000000 R09: 0000000000000000
    R10: ffff88007dcbb480 R11: ffff88006408e978 R12: ffff88007e0208c8
    R13: ffff88007e020890 R14: ffff88007e0208c8 R15: 0000000000000010
    FS: 00002ae490d5c6f0(0000) GS:ffffc20000400000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 0000000000000010 CR3: 0000000077d8a000 CR4: 00000000000026e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process make (pid: 5379, threadinfo ffff8800640f6000, task ffff880077cc6630)
    Stack:
    ffff88007e0403d0 ffff88007e0403d0 ffff8800640f7868 ffffffff803b21ea
    ffff88007e020890 ffff88007e0403a0 ffff8800640f78a8 ffffffff803b2237
    000000057e0208c8 ffff88007e0403a0 ffff88007e0403a0 ffff88007e020890
    Call Trace:
    [<ffffffff803b21ea>] rb_erase_init+0x11/0x21
    [<ffffffff803b2237>] cfq_prio_tree_add+0x3d/0xab
    [<ffffffff803b24ba>] cfq_resort_rr_list+0x25/0x2a
    [<ffffffff803b2513>] __cfq_slice_expired+0x54/0x94
    [<ffffffff803b3522>] cfq_insert_request+0x295/0x2d0
    [<ffffffff803a8404>] elv_insert+0x10f/0x1cd
    [<ffffffff803a8558>] __elv_add_request+0x96/0x9e
    [<ffffffff803ab284>] __make_request+0x3c2/0x402
    [<ffffffff803a995c>] generic_make_request+0x293/0x32d
    [<ffffffff80262f0c>] ? trace_hardirqs_on+0xd/0xf
    [<ffffffff8033b600>] ? ext3_get_block+0x0/0xe5
    [<ffffffff803aaeb9>] submit_bio+0xc7/0xd0
    [<ffffffff802ed865>] mpage_bio_submit+0x22/0x26
    [<ffffffff802ee567>] mpage_readpages+0xe2/0xf6
    [<ffffffff8033b600>] ? ext3_get_block+0x0/0xe5
    [<ffffffff8033aadf>] ext3_readpages+0x1a/0x1c
    [<ffffffff802982fc>] __do_page_cache_readahead+0x158/0x1fa
    [<ffffffff80298210>] ? __do_page_cache_readahead+0x6c/0x1fa
    [<ffffffff802983ba>] ra_submit+0x1c/0x20
    [<ffffffff802986c1>] ondemand_readahead+0x223/0x236
    [<ffffffff8029874c>] page_cache_async_readahead+0x78/0x84
    [<ffffffff80290e98>] generic_file_aio_read+0x295/0x5c8
    [<ffffffff802c752c>] do_sync_read+0xe2/0x126
    [<ffffffff80265a6f>] ? __lock_acquire+0x76c/0x7d7
    [<ffffffff8025691c>] ? autoremove_wake_function+0x0/0x38
    [<ffffffff802eec6f>] ? dnotify_parent+0x6c/0x74
    [<ffffffff802c7d5c>] vfs_read+0xab/0x154
    [<ffffffff802c80b9>] sys_read+0x47/0x70
    [<ffffffff8020baab>] system_call_fastpath+0x16/0x1b
    Code: 89 01 48 85 d2 74 12 48 39 7a 10 75 06 48 89 4a 10 eb 0a 48 89 4a 08 eb 04 49 89 0c 24 41 ff c8 0f 85 88 01 00 00 e9 4b 01 00 00 <48> 8b 7b 10 48 39 cf 0f 85 a1 00 00 00 48 8b 7b 08 48 8b 07 a8
    RIP [<ffffffff803ba4c8>] rb_erase+0x11f/0x2a7
    RSP <ffff8800640f7838>
    CR2: 0000000000000010


    --
    Balbir


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