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    Subjectptrace BUG [was: mmotm 2010-10-13-17-13 uploaded]
    On 10/14/2010 02:13 AM, akpm@linux-foundation.org wrote:
    > The mm-of-the-moment snapshot 2010-10-13-17-13 has been uploaded to

    Hi, I tried to run a process in gdb and got this BUG:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
    IP: [<ffffffff810c5c08>] fetch_bp_busy_slots.clone.1+0x28/0x1c0
    PGD 1bacfa067 PUD 13b7f1067 PMD 0
    Oops: 0000 [#1] SMP
    last sysfs file: /sys/devices/virtual/net/tun0/statistics/collisions
    CPU 1
    Modules linked in: dvb_usb_af9015 dvb_usb

    Pid: 18934, comm: gdb Not tainted 2.6.36-rc7-mm1_64+ #1286 To be filled
    by O.E.M./To Be Filled By O.E.M.
    RIP: 0010:[<ffffffff810c5c08>] [<ffffffff810c5c08>]
    fetch_bp_busy_slots.clone.1+0x28/0x1c0
    RSP: 0018:ffff8801b71a3ca8 EFLAGS: 00010286
    RAX: 0000000000000000 RBX: ffff8801b71a3d18 RCX: 0000000000000000
    RDX: ffff8801b71a3fd8 RSI: ffff88013bafc800 RDI: ffff8801b71a3d18
    RBP: ffff8801b71a3cf8 R08: ffffffff81039620 R09: ffff88013bafc800
    R10: fffe060673f40000 R11: 0000000000000001 R12: ffff88013bafc800
    R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88013bafc800
    FS: 00007f0acb802700(0000) GS:ffff8800af280000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000080 CR3: 0000000188f40000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process gdb (pid: 18934, threadinfo ffff8801b71a2000, task ffff88019ddfee80)
    Stack:
    0000000000000000 0000000000000000 0000000000000000 0000000000000000
    <0> 0000000000000000 ffff88013bafc800 ffff88013bafc800 0000000000000000
    <0> 0000000000000000 ffff88013bafc800 ffff8801b71a3d38 ffffffff810c5dfa
    Call Trace:
    [<ffffffff810c5dfa>] __reserve_bp_slot+0x5a/0x90
    [<ffffffff815c26d9>] ? mutex_lock+0x19/0x50
    [<ffffffff810c5e60>] reserve_bp_slot+0x20/0x40
    [<ffffffff810c5f41>] register_perf_hw_breakpoint+0x11/0x50
    [<ffffffff810c8da2>] ? filemap_fault+0x122/0x4b0
    [<ffffffff810c5fad>] hw_breakpoint_event_init+0x2d/0x50
    [<ffffffff810c4346>] perf_init_event+0x36/0x80
    [<ffffffff810c45d8>] perf_event_alloc+0x248/0x350
    [<ffffffff81039620>] ? ptrace_triggered+0x0/0x40
    [<ffffffff810c49bc>] perf_event_create_kernel_counter+0x2c/0x150
    [<ffffffff810c5601>] register_user_hw_breakpoint+0x11/0x20
    [<ffffffff8103975e>] ptrace_set_breakpoint_addr+0xde/0x100
    [<ffffffff8103a485>] ptrace_set_debugreg+0x55/0x80
    [<ffffffff8103a902>] arch_ptrace+0xe2/0x370
    [<ffffffff81074c18>] sys_ptrace+0x68/0xc0
    [<ffffffff815c3e1f>] ? page_fault+0x1f/0x30
    [<ffffffff8102ee2b>] system_call_fastpath+0x16/0x1b
    Code: 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 89 fb
    48 83 ec 28 44 8b b6 dc 01 00 00 48 8b 86 80 01 00 00 45 85 f6 <4c> 8b
    a8 80 00 00 00 78 5f 48 c7 c0 d8 e2 00 00 4d 63 f6 4a 8b
    RIP [<ffffffff810c5c08>] fetch_bp_busy_slots.clone.1+0x28/0x1c0
    RSP <ffff8801b71a3ca8>
    CR2: 0000000000000080
    ---[ end trace 8199f8c45e224e74 ]---
    psi[18938] trap int3 ip:7ffff3bdaa01 sp:7fffffffccc8 error:0

    Is there a pacth for this already? Or should I investigate further?

    regards,
    --
    js


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