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    SubjectRe: ptrace BUG [was: mmotm 2010-10-13-17-13 uploaded]
    On 10/20/2010 05:54 PM, Frederic Weisbecker wrote:
    > On Wed, Oct 20, 2010 at 05:50:15PM +0200, Jiri Slaby wrote:
    >> 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
    >
    >
    >
    > Do you have this fix?
    >
    > d580ff8699e8811a9af37e9de4dea375401bdeec
    > ("perf, hw_breakpoint: Fix crash in hw_breakpoint creation")
    >
    > It's in tip:/perf/core, which perhaps hasn't yet reached -next.
    >
    >
    > This should fix the problem.

    I applied the patch and got another BUG:
    WARNING: at /home/l/latest/xxx/kernel/fork.c:183
    __put_task_struct+0xf2/0x110()
    Hardware name: To Be Filled By O.E.M.
    Modules linked in: dvb_usb_af9015 dvb_usb
    Pid: 4743, comm: gdb Not tainted 2.6.36-rc7-mm1_64+ #1295
    Call Trace:
    [<ffffffff810692ca>] warn_slowpath_common+0x7a/0xb0
    [<ffffffff81069315>] warn_slowpath_null+0x15/0x20
    [<ffffffff810672a2>] __put_task_struct+0xf2/0x110
    [<ffffffff81074c4f>] sys_ptrace+0x7f/0xc0
    [<ffffffff8102ee2b>] system_call_fastpath+0x16/0x1b
    ---[ end trace 4d39ff87d0cf3ac8 ]---
    ------------[ cut here ]------------
    WARNING: at /home/l/latest/xxx/kernel/fork.c:183
    __put_task_struct+0xf2/0x110()
    Hardware name: To Be Filled By O.E.M.
    Modules linked in: dvb_usb_af9015 dvb_usb
    Pid: 4743, comm: gdb Tainted: G W 2.6.36-rc7-mm1_64+ #1295
    Call Trace:
    [<ffffffff810692ca>] warn_slowpath_common+0x7a/0xb0
    [<ffffffff81069315>] warn_slowpath_null+0x15/0x20
    [<ffffffff810672a2>] __put_task_struct+0xf2/0x110
    [<ffffffff81074c4f>] sys_ptrace+0x7f/0xc0
    [<ffffffff8102ee2b>] system_call_fastpath+0x16/0x1b
    ---[ end trace 4d39ff87d0cf3ac9 ]---
    BUG: unable to handle kernel NULL pointer dereference at (null)
    IP: [<ffffffff8108b55a>] exit_creds+0x1a/0x90
    PGD 1abdc9067 PUD 1abdcb067 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: 4743, comm: gdb Tainted: G W 2.6.36-rc7-mm1_64+ #1295 To
    be filled by O.E.M./To Be Filled By O.E.M.
    RIP: 0010:[<ffffffff8108b55a>] [<ffffffff8108b55a>] exit_creds+0x1a/0x90
    RSP: 0018:ffff8801a98e5f08 EFLAGS: 00010292
    RAX: 0000000000000000 RBX: ffff88019584f500 RCX: 000000000003ffff
    RDX: ffffffff81812968 RSI: 0000000000000046 RDI: 0000000000000000
    RBP: ffff8801a98e5f18 R08: 0000000000000034 R09: 000000000000e1fd
    R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000006
    R13: 0000000000000368 R14: 0000000000000000 R15: 000000000003057f
    FS: 00007f4d44bb5700(0000) GS:ffff8800af280000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 00000001abff4000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process gdb (pid: 4743, threadinfo ffff8801a98e4000, task ffff88019583a080)
    Stack:
    ffff8801a98e5f18 ffff88019584f500 ffff8801a98e5f38 ffffffff810671ed
    ffff88019584f500 0000000000000006 ffff8801a98e5f78 ffffffff81074c4f
    0000000000000003 fffffffffffffffd 00007f4d44bb56a8 0000000000000003
    Call Trace:
    [<ffffffff810671ed>] __put_task_struct+0x3d/0x110
    [<ffffffff81074c4f>] sys_ptrace+0x7f/0xc0
    [<ffffffff8102ee2b>] system_call_fastpath+0x16/0x1b
    Code: 84 36 ff ff ff e9 0f ff ff ff 0f 0b 0f 0b 0f 1f 00 55 48 89 e5 53
    48 89 fb 48 83 ec 08 48 8b 87 08 03 00 00 48 8b bf 00 03 00 00 <8b> 00
    48 c7 83 00 03 00 00 00 00 00 00 f0 ff 0f 0f 94 c0 84 c0
    RIP [<ffffffff8108b55a>] exit_creds+0x1a/0x90
    RSP <ffff8801a98e5f08>
    CR2: 0000000000000000
    ---[ end trace 4d39ff87d0cf3aca ]---
    psi[4748] trap int3 ip:7ffff3bdaa01 sp:7fffffffccc8 error:0

    thanks,
    --
    js


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