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SubjectRe: v2.6.26-rc9: kernel BUG at kernel/sched.c:5858!
On Fri, Jul 11, 2008 at 1:04 PM, Vegard Nossum <vegard.nossum@gmail.com> wrote:
> On Fri, Jul 11, 2008 at 11:02 AM, Dmitry Adamushko
> <dmitry.adamushko@gmail.com> wrote:
>> Vegard,
>>
>>
>> regarding the first crash. Would you please run your test with the
>> following debugging patch and let me know its output?
>>
>> The apperance of " * [ pid ] comm (name), orig_cpu() ... " means we
>> hit a problematic case (with Miao Xie's patch it shouldn't crash).
>>
>> I see that you have CONFIG_SCHED_DEBUG=y so I'm also interested in
>> messages from sched_domain_debug() - "CPU# attaching ...". IOW, all
>> the kernel messages appearing while a cpu is going down and up.
[...]

> Ok, now I tested it on my laptop (sorry, no serial console :-)) and I

Now I tested using serial console, but nothing new:

CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU0 attaching sched-domain:
domain 0: span 0-1
groups: 0 1
domain 1: span 0-1
groups: 0-1
CPU1 attaching sched-domain:
domain 0: span 0-1
groups: 1 0
domain 1: span 0-1
groups: 0-1
* [ 7 ] comm (ksoftirqd/1), orig_cpu (1), dst_cpu (1), cpu (1)
CPU 1 is now offline
* [ 1228 ] comm (kjournald), orig_cpu (0), dst_cpu (0), cpu (0)
* [ 3113 ] comm (klogd), orig_cpu (0), dst_cpu (0), cpu (0)
BUG: spinlock recursion on CPU#0, syslogd/3110

and here the output stops. I find this REALLY strange, look at the
spinlock recursion code:

printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
msg, raw_smp_processor_id(),
current->comm, task_pid_nr(current));
printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, "
".owner_cpu: %d\n",
lock, lock->magic,
owner ? owner->comm : "<none>",
owner ? task_pid_nr(owner) : -1,
lock->owner_cpu);

why would it not be able to print the second line?


Vegard

--
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
-- E. W. Dijkstra, EWD1036


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