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| From | Peter Zijlstra <peterz@infradead.org> |
| Newsgroups | linux.kernel |
| Subject | Re: Crash in __wake_up_common |
| Date | Wed, 20 Apr 2016 11:50:02 +0200 |
| Message-ID | <rpWVI-5LM-29@gated-at.bofh.it> (permalink) |
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| X-Original-To | Nikolay Borisov <kernel@kyup.com> |
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| X-Original-Date | Wed, 20 Apr 2016 11:41:17 +0200 |
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On Tue, Apr 19, 2016 at 05:37:48PM +0300, Nikolay Borisov wrote:
>
> ffffffff810e08be points to this line in __wake_up_common:
> list_for_each_entry_safe(curr, next, &q->task_list, task_list) {
>
> This is the wait_queue_head_t:
>
> crash> struct wait_queue_head_t ffff880438ef52c8
> struct wait_queue_head_t {
> lock = {
> {
> rlock = {
> raw_lock = {
> val = {
> counter = 1
> }
> }
> }
> }
> },
> task_list = {
> next = 0x0,
> prev = 0xffff880438ef52d8
> }
> }
>
> nr_exclusive seems to be 1, and mode is 3 (TASK_NORMAL).
>
> The spl module is coming from zfs(ZoL) but I dunno whether this might
> be a bug in the scheduler or in the zfs. The line which led to the
> __wake_up is this:
>
> wake_up(&tq->tq_wait_waitq);
Given that the waitqueue code is rather widely used, I suspect this is a
fail in zfs. But given the license issues I'm not going near that code.
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Crash in __wake_up_common Nikolay Borisov <kernel@kyup.com> - 2016-04-19 16:40 +0200 Re: Crash in __wake_up_common Peter Zijlstra <peterz@infradead.org> - 2016-04-20 11:50 +0200
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