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    Subject[BUG] Linux 2.6.25-rc2 - Kernel Ooops while running dbench
    Hi,

    The 2.6.25-rc2 kernel oopses while running dbench on ext3 filesystem
    mounted with mount -o data=writeback,nobh option on the x86_64 box

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
    IP: [<ffffffff80274972>] kmem_cache_alloc+0x3a/0x6c
    PGD 1f6860067 PUD 1f5d64067 PMD 0
    Oops: 0000 [1] SMP
    CPU 3
    Modules linked in:
    Pid: 4271, comm: dbench Not tainted 2.6.25-rc2-autotest #1
    RIP: 0010:[<ffffffff80274972>] [<ffffffff80274972>] kmem_cache_alloc+0x3a/0x6c
    RSP: 0000:ffff8101fb041dc8 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: ffff810180033c00 RCX: ffffffff8027b269
    RDX: 0000000000000000 RSI: 00000000000080d0 RDI: ffffffff80632d70
    RBP: 00000000000080d0 R08: 0000000000000001 R09: 0000000000000000
    R10: ffff8101feb36e50 R11: 0000000000000190 R12: 0000000000000001
    R13: 0000000000000000 R14: ffff8101f8f38000 R15: 00000000ffffff9c
    FS: 0000000000000000(0000) GS:ffff8101fff0f000(0063) knlGS:00000000f7e41460
    CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 00000001f5620000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process dbench (pid: 4271, threadinfo ffff8101fb040000, task ffff8101fb180000)
    Stack: 0000000000000001 ffff8101fb041ea8 0000000000000001 ffffffff8027b269
    ffff8101fb041ea8 ffffffff80281fe8 0000000000000001 0000000000000000
    ffff8101fb041ea8 00000000ffffff9c 000000000000000b 0000000000000001
    Call Trace:
    [<ffffffff8027b269>] get_empty_filp+0x55/0xf9
    [<ffffffff80281fe8>] __path_lookup_intent_open+0x22/0x8f
    [<ffffffff80282853>] open_namei+0x86/0x5a7
    [<ffffffff8027d019>] vfs_stat_fd+0x3c/0x4a
    [<ffffffff80279ab1>] do_filp_open+0x1c/0x3d
    [<ffffffff80279c2c>] get_unused_fd_flags+0x79/0x111
    [<ffffffff80279dce>] do_sys_open+0x46/0xca
    [<ffffffff80221c82>] ia32_sysret+0x0/0xa


    Code: 24 00 00 00 48 98 48 8b 9c c7 d8 02 00 00 48 8b 13 f6 c2 01 74 12 83 ca ff 49 89 d8 89 ee e8 1f fb ff ff 48 89 c2 eb 13 8b 43 14 <48> 8b 34 c2 48 89 d0 48 0f b1 33 48 39 d0 75 d3 c1 ed 0f 31 c0
    RIP [<ffffffff80274972>] kmem_cache_alloc+0x3a/0x6c
    RSP <ffff8101fb041dc8>
    CR2: 0000000000000000
    BUG: unable to handle kernel paging request at 00000000f51f3e1c
    IP: [<ffffffff80417d02>] tg3_poll+0x10c/0x82e
    PGD 1f6860067 PUD 1f37a5067 PMD 0
    Oops: 0000 [2] SMP
    CPU 3
    Modules linked in:
    Pid: 4271, comm: dbench Tainted: G D 2.6.25-rc2-autotest #1
    RIP: 0010:[<ffffffff80417d02>] [<ffffffff80417d02>] tg3_poll+0x10c/0x82e
    RSP: 0000:ffff8100e3b6fe60 EFLAGS: 00010206
    RAX: 00000000f51f3e18 RBX: ffff8101ff1d4f50 RCX: 00000000000032e1
    RDX: 00000000000032e1 RSI: 0000000000000246 RDI: ffffffff806aaad8
    RBP: ffff8101ff67e6c0 R08: ffff8100e3b6fedc R09: ffff8100e3b6fee0
    R10: 0000000000000282 R11: 0000000000000282 R12: 000000000000014f
    R13: ffff8101f51f3d80 R14: 0000000000000000 R15: 000000000000014f
    FS: 0000000000000000(0000) GS:ffff8101fff0f000(0063) knlGS:00000000f7e41460
    CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
    CR2: 00000000f51f3e1c CR3: 00000001f5620000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process dbench (pid: 4271, threadinfo ffff8101fb040000, task ffff8101fb180000)
    Stack: ffff8101fb041d18 ffff8101feb83040 ffff8100e3b6ff20 ffffffff80228bd0
    ffff8100e3b6feec 00000000fff0ff80 ffff8101ff0c4000 0000000000000246
    ffff8101ff0c4000 0000004000000000 ffff8101ff67e758 ffff8101ff67e758
    Call Trace:
    <IRQ> [<ffffffff80228bd0>] run_rebalance_domains+0x162/0x432
    [<ffffffff80477b5e>] net_rx_action+0x75/0x14a
    [<ffffffff80233ef0>] __do_softirq+0x50/0xbb
    [<ffffffff8020c33c>] call_softirq+0x1c/0x28
    [<ffffffff8020e4b7>] do_softirq+0x2f/0x84
    [<ffffffff8021b8a8>] smp_apic_timer_interrupt+0x8b/0x9e
    [<ffffffff8020bde6>] apic_timer_interrupt+0x66/0x70
    <EOI> [<ffffffff8021e3c0>] flat_send_IPI_mask+0x0/0x4c
    [<ffffffff8020cca6>] oops_end+0x38/0x6a
    [<ffffffff802200dd>] do_page_fault+0x716/0x7bf
    [<ffffffff804ebab9>] error_exit+0x0/0x51
    [<ffffffff8027b269>] get_empty_filp+0x55/0xf9
    [<ffffffff80274972>] kmem_cache_alloc+0x3a/0x6c
    [<ffffffff8027b269>] get_empty_filp+0x55/0xf9
    [<ffffffff80281fe8>] __path_lookup_intent_open+0x22/0x8f
    [<ffffffff80282853>] open_namei+0x86/0x5a7
    [<ffffffff8027d019>] vfs_stat_fd+0x3c/0x4a
    [<ffffffff80279ab1>] do_filp_open+0x1c/0x3d
    [<ffffffff80279c2c>] get_unused_fd_flags+0x79/0x111
    [<ffffffff80279dce>] do_sys_open+0x46/0xca
    [<ffffffff80221c82>] ia32_sysret+0x0/0xa


    Code: 8b 05 a3 2e 29 00 41 ff c4 45 31 f6 41 81 e4 ff 01 00 00 ff 50 28 48 c7 03 00 00 00 00 41 8b 85 a0 00 00 00 49 03 85 a8 00 00 00 <0f> b7 40 04 39 44 24 2c 0f 8d 95 00 00 00 44 89 e0 48 6b d8 18
    RIP [<ffffffff80417d02>] tg3_poll+0x10c/0x82e
    RSP <ffff8100e3b6fe60>
    CR2: 00000000f51f3e1c

    --
    Thanks & Regards,
    Kamalesh Babulal,
    Linux Technology Center,
    IBM, ISTL.


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