Re: Kernel oops (NLM?)

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Mon, 2006-08-14 at 10:01 +0200, Allard Hoeve wrote:
> Hello all,
> 
> Some time ago, I encountered a kernel oops that resulted in a crashed lock 
> daemon. nfsd never stopped working, but all client lock requests stalled.
> 
> The machine is a PowerEdge 2850 and had a vanilla 2.6.16.13 kernel 
> running.

I'd suggest upgrading. We've eliminated a lot of races in NLM since
then, and have (among other things) completely removed the codepath that
appears to have Oopsed below.

Cheers,
  Trond

> I'm not sure how to debug this, so I thought I might just send it to you.
> 
> If you need any more information, please ask. I'm on the list.
> 
> Regards,
> 
> Allard Hoeve
> 
> PS: Kernel config attached
> 
> 
> 
> Unable to handle kernel paging request at virtual address 6e6f6974
>   printing eip:
> c0176469
> *pde = 00000000
> Oops: 0000 [#1]
> SMP
> Modules linked in: nfsd ipv6 shpchp pci_hotplug ehci_hcd uhci_hcd usbcore 
> ide_cd cdrom
> CPU:    0
> EIP:    0060:[<c0176469>]    Not tainted VLI
> EFLAGS: 00010246   (2.6.16.13-byte #2)
> EIP is at posix_locks_deadlock+0x3b/0x5e
> eax: 00000000   ebx: 6e6f6974   ecx: f7fb74b8   edx: 00000000
> esi: f7fb74b8   edi: f73622b8   ebp: f7362200   esp: f7247efc
> ds: 007b   es: 007b   ss: 0068
> Process lockd (pid: 2478, threadinfo=f7246000 task=f7d89030)
> Stack: <0>f77634c8 f7fb74b8 f7fb74b8 f7362600 f7362224 c022446d f73622b8 f7fb74b8
>         00000000 d22430c0 f7362224 f7362200 00000000 c0229148 f7735400 f7247f40
>         f7477c00 f73622b8 f7362200 f7362600 f7735400 f7735464 c02293a9 f7735400
> Call Trace:
>   [<c022446d>] nlmsvc_lock+0x9a/0x414
>   [<c0229148>] nlm4svc_retrieve_args+0x7c/0xe9
>   [<c02293a9>] nlm4svc_proc_lock+0xe2/0x13d
>   [<c045ce98>] svc_process+0x3f0/0x684
>   [<c0223a6a>] lockd+0x133/0x23a
>   [<c0223937>] lockd+0x0/0x23a
>   [<c0101141>] kernel_thread_helper+0x5/0xb
> Code: 24 04 89 3c 24 e8 f7 fa ff ff 85 c0 75 39 8b 1d 5c 47 4e c0 eb 15 8d 
> 43 fc 89 74 24 04 89 04 24 e8 dc fa ff ff 85 c0 75 19 8b 1b <8b> 03 0f 18 
> 00 90 81 fb 5c 47 4e c0 75 dd 31 c0 83 c4 08 5b 5e
>   <4>lockd_down: lockd failed to exit, clearing pid
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