Bug#592497: linux-image-2.6.32-bpo.5-686-bigmem: Kernel panic in put_cred_rcu()
>> Hi,
>> I'm using the latest lenny-backport kernel on a new dell poweredge R710.
>> every few days I have a kernel panic similar to : Kernel panic - not
>> syncing: CRED: put_cred_rcu() sees f640ad80 with usage -163535872"
>
> Do you see the same message (apart from the numbers) or different
> message?
The server crashed two time since I submitted this bug :
the first one is similar :
[281132.706553] Kernel panic - not syncing: CRED: put_cred_rcu() sees f6236680 with usage -30
and is followed by several Oopses
the second one is not:
[38386.986977] BUG: unable to handle kernel NULL pointer dereference at 00000010
[38387.012306] IP: [<c102b85c>] task_rq_lock+0x25/0x5d
[38387.026138] *pdpt = 000000003373f001 *pde = 0000000000000000
[38387.040577] Oops: 0000 [#1] SMP
[...]
do you want more details on these ?
>> we noticed something : when the server froze after a panic (before I
>> set it up to automatically switch to a crashkernel) , the other
>> servers connected to the same ethernet switch were unreachable over
>> the network. everything seems as if the ethernet card gets crazy and
>> starts sending random data . I can't say for sure ... Restarting the
>> faulty server gets everything back in order.
> [...]
>
> That's interesting. Could you try using a different Ethernet card in
> this server temporarily? (If you are using on-board Ethernet ports
> currently, just don't plug anything into them while you are doing this
> test.)
>
> Ben.
Unfortunately we do not have a spare ethernet card on hand. I'll try if I find one.
Joseph.
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