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    SubjectRe: 2.6.33.5 rt23: machine lockup (nfs/autofs related?)
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    On Mon, 2010-07-12 at 20:06 -0700, Fernando Lopez-Lezcano wrote:
    > > > --------
    > > > BUG: unable to handle kernel NULL pointer dereference at 0000008c
    > > > IP: [<c045e50a>] rt_spin_lock_fastunlock.clone.2+0x6/0x3e
    > > ...
    > > > Pid: 2855, comm: nautilus Not tainted
    > > > 2.6.33.6-147.rt23.3.fc12.ccrma.i686.rt #3 P5K/EPU/P5K/EPU
    > > > EIP: 0060:[<c045e50a>] EFLAGS: 00210246 CPU: 0
    > > > EIP is at rt_spin_lock_fastunlock.clone.2+0x6/0x3e
    > > > EAX: 00000078 EBX: ef45393c ECX: 00000000 EDX: 00000078
    > > > ESI: ef716edc EDI: 00000000 EBP: f1977c8c ESP: f1977c88
    > > > DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 preempt:00000000
    > > > Process nautilus (pid: 2855, ti=f1976000 task=f2347130 task.ti=f1976000)
    > > > Stack:
    > > > ef45393c f1977c94 c0781206 f1977cc8 c04d842e 00000000 ef703e54 faadd5bc
    > > > <0> f1977cdc 126bc87a ef703ddc 00000000 ef45393c ef716edc ef6f5494
    > > > faafdc6c
    > > > <0> f1977df8 faad9041 c3604b5c faafdc6c ef452bfc 00007e7f f5eb41e8
    > > > 00000007
    > > > Call Trace:
    > > > [<c0781206>] ? rt_spin_unlock+0x8/0xa
    > > > [<c04d842e>] ? d_materialise_unique+0x210/0x2aa
    > >
    > > Can you gdb list *0xc04d842e ?
    >
    > (gdb) list *0xc04d842e
    > 0xc04d842e is in d_materialise_unique (fs/dcache.c:2073).
    > 2068 out_unalias:
    > 2069 d_move_locked(alias, dentry);
    > 2070 ret = alias;
    > 2071 out_err:
    > 2072 spin_unlock(&inode->i_lock);
    > 2073 if (m2)
    > 2074 mutex_unlock(m2);
    > 2075 if (m1)
    > 2076 mutex_unlock(m1);
    > 2077 return ret;
    >
    > > Thanks again for all the testing here! Its really appreciated!

    I just tried building 2.6.33.6 rt26 (saw it this morning on the site)
    and it does not exhibit this problem. Woohoo!

    Thanks again!
    -- Fernando




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