Re: Kernel Bug at spinlock.h ?!

[ChristopherHuhn]

Hi,

I'm sorry I didn't know about ksymoops as I'm not experienced with 
kernel bugs yet.

Richard B. Johnson wrote:

>The "Re: Kernel Bug at spinlock.h ?!" is an eye-catcher because this
>inline code cannot have any bugs or you wouldn't even have booted.
>
I think this is the code, that produced the BUG message:

static inline void spin_unlock(spinlock_t *lock)
{
        char oldval = 1;
#if SPINLOCK_DEBUG
        if (lock->magic != SPINLOCK_MAGIC)
                BUG();
...

The oops occured after an uptime of about 50 hours.

I just discovered the following messages in the syslog, right before 
that oops (I never found any kernel oops logs in the syslog until now ...):

Feb 27 20:51:37 lxb039 kernel: Unable to handle kernel NULL pointer 
dereference at virtual address 00000000
Feb 27 20:51:37 lxb039 kernel:  printing eip:
Feb 27 20:51:37 lxb039 kernel: 00000000
Feb 27 20:51:37 lxb039 kernel: *pde = 00000000
Feb 27 20:51:37 lxb039 kernel: Oops: 0000
Feb 27 20:51:37 lxb039 kernel: CPU:    3
Feb 27 20:51:37 lxb039 kernel: EIP:    0010:[msr_exit+0/24]    Not tainted
Feb 27 20:51:37 lxb039 kernel: EFLAGS: 00010246
Feb 27 20:51:37 lxb039 kernel: eax: fffffffe   ebx: f1857cb0   ecx: 
00000002   edx: 00000008
Feb 27 20:51:37 lxb039 kernel: esi: fffffff5   edi: f1857cb0   ebp: 
f1857c90   esp: f1857c84
Feb 27 20:51:37 lxb039 kernel: ds: 0018   es: 0018   ss: 0018
Feb 27 20:51:37 lxb039 kernel: Process sh (pid: 29359, stackpage=f1857000)
Feb 27 20:51:37 lxb039 kernel: Stack: f1857cb0 f1857ca8 00000000 
f1857d38 c02a8ff1 f1857cb0 f1857d58 f1856000
Feb 27 20:51:37 lxb039 kernel:        00000001 fffffefd ffffffff 
00000000 00000000 00000000 00000000 00000000
Feb 27 20:51:37 lxb039 kernel:        00000000 00000000 fffffffe 
00000000 00000003 f1857da8 f1857d9c 00000000
Feb 27 20:51:38 lxb039 kernel: Call Trace:    [rpc_call_sync+121/164] 
[rpc_run_timer+0/240] [nfs3_rpc_wrapper+54/124] [nfs3_proc_lookup
+194/340] [nfs_lookup+122/204]
Feb 27 20:51:38 lxb039 kernel:   [dput+27/464] 
[link_path_walk+2940/3200] [in_group_p+32/40] [vfs_permission+121/248] 
[d_alloc+25/476]
[real_lookup+169/360]
Feb 27 20:51:38 lxb039 kernel:   [link_path_walk+2425/3200] 
[path_walk+29/36] [path_lookup+30/44] [__user_walk+45/72] [sys_stat64+26/11
2] [sys_close+115/140]
Feb 27 20:51:38 lxb039 kernel:   [system_call+51/56]
Feb 27 20:51:38 lxb039 kernel:
Feb 27 20:51:38 lxb039 kernel: Code:  Bad EIP value.

Looks like a NFS problem, huh?