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SubjectRe: frequent softlockups with 3.10rc6.
On 06/23, Dave Jones wrote:
>
> On Sun, Jun 23, 2013 at 06:04:52PM +0200, Oleg Nesterov wrote:
>
> > Could you please do the following:
> >
> > 1. # cd /sys/kernel/debug/tracing
> > # echo 0 >> options/function-trace
> > # echo preemptirqsoff >> current_tracer
>
> dammit.
>
> WARNING: at include/linux/list.h:385 rb_head_page_deactivate.isra.39+0x61/0x80()

Hmmm. which kernel do use use?

380 #define list_for_each(pos, head) \
381 for (pos = (head)->next; pos != (head); pos = pos->next)
382
383 /**
384 * __list_for_each - iterate over a list
385 * @pos: the &struct list_head to use as a loop cursor.
386 * @head: the head for your list.
387 *
388 * This variant doesn't differ from list_for_each() any more.
389 * We don't do prefetching in either case.
390 */
391 #define __list_for_each(pos, head) \
392 for (pos = (head)->next; pos != (head); pos = pos->next)
393
394 /**
395 * list_for_each_prev - iterate over a list backwards
396 * @pos: the &struct list_head to use as a loop cursor.
397 * @head: the head for your list.
398 */
399 #define list_for_each_prev(pos, head) \
400 for (pos = (head)->prev; pos != (head); pos = pos->prev)

On 9e895ace5d8 (Linux 3.10-rc7).

> check_list_nodes corruption. next->prev should be prev (ffff88023b8a1a08), but was 00ffff88023b8a1a. (next=ffff880243288001).

Can't find "check_list_nodes" in lib/list_debug.c or elsewhere...

> [<ffffffff816e467d>] dump_stack+0x19/0x1b
> [<ffffffff8104a0c1>] warn_slowpath_common+0x61/0x80
> [<ffffffff8104a12c>] warn_slowpath_fmt+0x4c/0x50
> [<ffffffff81112c61>] rb_head_page_deactivate.isra.39+0x61/0x80

How? rb_list_head_clear() just modifies list->next directly.

> hopefully despite that it'll actually function as intended.

Yes ;)

Oleg.



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