* sleeping function warning from __put_anon_vma
@ 2014-05-30 0:09 Dave Jones
2014-05-31 20:33 ` Hugh Dickins
0 siblings, 1 reply; 6+ messages in thread
From: Dave Jones @ 2014-05-30 0:09 UTC (permalink / raw
To: Linux Kernel; +Cc: linux-mm
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:47
in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
Preemption disabled at:[<ffffffff990acc7e>] vtime_account_system+0x1e/0x50
CPU: 0 PID: 5787 Comm: trinity-c27 Not tainted 3.15.0-rc7+ #219
ffffffff99a47203 0000000099b50bef ffff880239f138c8 ffffffff99739dfb
0000000000000000 ffff880239f138f0 ffffffff990a026c ffff8801078b5458
ffff8801078b5450 ffffea00044be980 ffff880239f13908 ffffffff99741c30
Call Trace:
[<ffffffff99739dfb>] dump_stack+0x4e/0x7a
[<ffffffff990a026c>] __might_sleep+0x11c/0x1b0
[<ffffffff99741c30>] down_write+0x20/0x40
[<ffffffff9919337d>] __put_anon_vma+0x3d/0xc0
[<ffffffff99193998>] page_get_anon_vma+0x68/0xb0
[<ffffffff991b97e9>] migrate_pages+0x449/0x880
[<ffffffff9917dc00>] ? isolate_freepages_block+0x360/0x360
[<ffffffff9917ec8a>] compact_zone+0x38a/0x580
[<ffffffff9917ef29>] compact_zone_order+0xa9/0x130
[<ffffffff9917f329>] try_to_compact_pages+0xe9/0x140
[<ffffffff991616da>] __alloc_pages_direct_compact+0x7a/0x250
[<ffffffff99161fbb>] __alloc_pages_nodemask+0x70b/0xbb0
[<ffffffff991a9c3f>] alloc_pages_vma+0xaf/0x1c0
[<ffffffff991bdc8d>] do_huge_pmd_anonymous_page+0xed/0x3d0
[<ffffffff991871b4>] handle_mm_fault+0x1b4/0xc50
[<ffffffff9974358d>] ? retint_restore_args+0xe/0xe
[<ffffffff99746939>] __do_page_fault+0x1c9/0x630
[<ffffffff99118acb>] ? __acct_update_integrals+0x8b/0x120
[<ffffffff9974725b>] ? preempt_count_sub+0xab/0x100
[<ffffffff99746dbe>] do_page_fault+0x1e/0x70
[<ffffffff997437f2>] page_fault+0x22/0x30
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: sleeping function warning from __put_anon_vma
2014-05-30 0:09 sleeping function warning from __put_anon_vma Dave Jones
@ 2014-05-31 20:33 ` Hugh Dickins
2014-05-31 21:04 ` Vlastimil Babka
2014-06-01 19:32 ` Peter Zijlstra
0 siblings, 2 replies; 6+ messages in thread
From: Hugh Dickins @ 2014-05-31 20:33 UTC (permalink / raw
To: Dave Jones; +Cc: Peter Zijlstra, Andrew Morton, linux-kernel, linux-mm
On Thu, 29 May 2014, Dave Jones wrote:
> BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:47
> in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
> Preemption disabled at:[<ffffffff990acc7e>] vtime_account_system+0x1e/0x50
> CPU: 0 PID: 5787 Comm: trinity-c27 Not tainted 3.15.0-rc7+ #219
> ffffffff99a47203 0000000099b50bef ffff880239f138c8 ffffffff99739dfb
> 0000000000000000 ffff880239f138f0 ffffffff990a026c ffff8801078b5458
> ffff8801078b5450 ffffea00044be980 ffff880239f13908 ffffffff99741c30
> Call Trace:
> [<ffffffff99739dfb>] dump_stack+0x4e/0x7a
> [<ffffffff990a026c>] __might_sleep+0x11c/0x1b0
> [<ffffffff99741c30>] down_write+0x20/0x40
> [<ffffffff9919337d>] __put_anon_vma+0x3d/0xc0
> [<ffffffff99193998>] page_get_anon_vma+0x68/0xb0
> [<ffffffff991b97e9>] migrate_pages+0x449/0x880
> [<ffffffff9917dc00>] ? isolate_freepages_block+0x360/0x360
> [<ffffffff9917ec8a>] compact_zone+0x38a/0x580
> [<ffffffff9917ef29>] compact_zone_order+0xa9/0x130
> [<ffffffff9917f329>] try_to_compact_pages+0xe9/0x140
> [<ffffffff991616da>] __alloc_pages_direct_compact+0x7a/0x250
> [<ffffffff99161fbb>] __alloc_pages_nodemask+0x70b/0xbb0
> [<ffffffff991a9c3f>] alloc_pages_vma+0xaf/0x1c0
> [<ffffffff991bdc8d>] do_huge_pmd_anonymous_page+0xed/0x3d0
> [<ffffffff991871b4>] handle_mm_fault+0x1b4/0xc50
> [<ffffffff9974358d>] ? retint_restore_args+0xe/0xe
> [<ffffffff99746939>] __do_page_fault+0x1c9/0x630
> [<ffffffff99118acb>] ? __acct_update_integrals+0x8b/0x120
> [<ffffffff9974725b>] ? preempt_count_sub+0xab/0x100
> [<ffffffff99746dbe>] do_page_fault+0x1e/0x70
> [<ffffffff997437f2>] page_fault+0x22/0x30
Well caught again. This one doesn't seem to have been plaguing users,
but nice to find and fix it. I don't think there are any gotchas to
the patch below (in each case we've done a good atomic_inc_not_zero,
so the anon_vma cannot be surprisingly freed when we rcu_read_unlock).
But even so, I don't think it should go into a tree without Ack from
Peter - in looking back there, he might notice something else has
changed, or be inspired to fix it in a more satisfying way.
Hugh
[PATCH] mm: fix sleeping function warning from __put_anon_vma
Trinity reports BUG:
sleeping function called from invalid context at kernel/locking/rwsem.c:47
in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
__might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
Right, since conversion to mutex then rwsem, we should not put_anon_vma()
from inside an rcu_read_lock()ed section: fix the two places that did so.
Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Needs-Ack-from: Peter Zijlstra <peterz@infradead.org>
---
mm/rmap.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- 3.15-rc7/mm/rmap.c 2014-04-13 17:24:36.680507189 -0700
+++ linux/mm/rmap.c 2014-05-31 12:02:08.496088637 -0700
@@ -426,12 +426,14 @@ struct anon_vma *page_get_anon_vma(struc
* above cannot corrupt).
*/
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
anon_vma = NULL;
+ goto outer;
}
out:
rcu_read_unlock();
-
+outer:
return anon_vma;
}
@@ -477,9 +479,10 @@ struct anon_vma *page_lock_anon_vma_read
}
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
anon_vma = NULL;
- goto out;
+ goto outer;
}
/* we pinned the anon_vma, its safe to sleep */
@@ -501,6 +504,7 @@ struct anon_vma *page_lock_anon_vma_read
out:
rcu_read_unlock();
+outer:
return anon_vma;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: sleeping function warning from __put_anon_vma
2014-05-31 20:33 ` Hugh Dickins
@ 2014-05-31 21:04 ` Vlastimil Babka
2014-05-31 21:16 ` Hugh Dickins
2014-06-01 19:32 ` Peter Zijlstra
1 sibling, 1 reply; 6+ messages in thread
From: Vlastimil Babka @ 2014-05-31 21:04 UTC (permalink / raw
To: Hugh Dickins, Dave Jones
Cc: Peter Zijlstra, Andrew Morton, linux-kernel, linux-mm
On 05/31/2014 10:33 PM, Hugh Dickins wrote:
> On Thu, 29 May 2014, Dave Jones wrote:
>
>> BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:47
>> in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
>> Preemption disabled at:[<ffffffff990acc7e>] vtime_account_system+0x1e/0x50
Just wondering, since I'm not familiar with this kind of bug, is the line above
bogus or what does it mean? I don't see how the stack trace or the fix patch is
related to vtime_account_system?
Thanks,
Vlastimil
>> CPU: 0 PID: 5787 Comm: trinity-c27 Not tainted 3.15.0-rc7+ #219
>> ffffffff99a47203 0000000099b50bef ffff880239f138c8 ffffffff99739dfb
>> 0000000000000000 ffff880239f138f0 ffffffff990a026c ffff8801078b5458
>> ffff8801078b5450 ffffea00044be980 ffff880239f13908 ffffffff99741c30
>> Call Trace:
>> [<ffffffff99739dfb>] dump_stack+0x4e/0x7a
>> [<ffffffff990a026c>] __might_sleep+0x11c/0x1b0
>> [<ffffffff99741c30>] down_write+0x20/0x40
>> [<ffffffff9919337d>] __put_anon_vma+0x3d/0xc0
>> [<ffffffff99193998>] page_get_anon_vma+0x68/0xb0
>> [<ffffffff991b97e9>] migrate_pages+0x449/0x880
>> [<ffffffff9917dc00>] ? isolate_freepages_block+0x360/0x360
>> [<ffffffff9917ec8a>] compact_zone+0x38a/0x580
>> [<ffffffff9917ef29>] compact_zone_order+0xa9/0x130
>> [<ffffffff9917f329>] try_to_compact_pages+0xe9/0x140
>> [<ffffffff991616da>] __alloc_pages_direct_compact+0x7a/0x250
>> [<ffffffff99161fbb>] __alloc_pages_nodemask+0x70b/0xbb0
>> [<ffffffff991a9c3f>] alloc_pages_vma+0xaf/0x1c0
>> [<ffffffff991bdc8d>] do_huge_pmd_anonymous_page+0xed/0x3d0
>> [<ffffffff991871b4>] handle_mm_fault+0x1b4/0xc50
>> [<ffffffff9974358d>] ? retint_restore_args+0xe/0xe
>> [<ffffffff99746939>] __do_page_fault+0x1c9/0x630
>> [<ffffffff99118acb>] ? __acct_update_integrals+0x8b/0x120
>> [<ffffffff9974725b>] ? preempt_count_sub+0xab/0x100
>> [<ffffffff99746dbe>] do_page_fault+0x1e/0x70
>> [<ffffffff997437f2>] page_fault+0x22/0x30
>
> Well caught again. This one doesn't seem to have been plaguing users,
> but nice to find and fix it. I don't think there are any gotchas to
> the patch below (in each case we've done a good atomic_inc_not_zero,
> so the anon_vma cannot be surprisingly freed when we rcu_read_unlock).
> But even so, I don't think it should go into a tree without Ack from
> Peter - in looking back there, he might notice something else has
> changed, or be inspired to fix it in a more satisfying way.
>
> Hugh
>
> [PATCH] mm: fix sleeping function warning from __put_anon_vma
>
> Trinity reports BUG:
> sleeping function called from invalid context at kernel/locking/rwsem.c:47
> in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
> __might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
> migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
>
> Right, since conversion to mutex then rwsem, we should not put_anon_vma()
> from inside an rcu_read_lock()ed section: fix the two places that did so.
>
> Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
> Reported-by: Dave Jones <davej@redhat.com>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> Needs-Ack-from: Peter Zijlstra <peterz@infradead.org>
> ---
>
> mm/rmap.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> --- 3.15-rc7/mm/rmap.c 2014-04-13 17:24:36.680507189 -0700
> +++ linux/mm/rmap.c 2014-05-31 12:02:08.496088637 -0700
> @@ -426,12 +426,14 @@ struct anon_vma *page_get_anon_vma(struc
> * above cannot corrupt).
> */
> if (!page_mapped(page)) {
> + rcu_read_unlock();
> put_anon_vma(anon_vma);
> anon_vma = NULL;
> + goto outer;
> }
> out:
> rcu_read_unlock();
> -
> +outer:
> return anon_vma;
> }
>
> @@ -477,9 +479,10 @@ struct anon_vma *page_lock_anon_vma_read
> }
>
> if (!page_mapped(page)) {
> + rcu_read_unlock();
> put_anon_vma(anon_vma);
> anon_vma = NULL;
> - goto out;
> + goto outer;
> }
>
> /* we pinned the anon_vma, its safe to sleep */
> @@ -501,6 +504,7 @@ struct anon_vma *page_lock_anon_vma_read
>
> out:
> rcu_read_unlock();
> +outer:
> return anon_vma;
> }
>
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: sleeping function warning from __put_anon_vma
2014-05-31 21:04 ` Vlastimil Babka
@ 2014-05-31 21:16 ` Hugh Dickins
0 siblings, 0 replies; 6+ messages in thread
From: Hugh Dickins @ 2014-05-31 21:16 UTC (permalink / raw
To: Vlastimil Babka
Cc: Dave Jones, Peter Zijlstra, Andrew Morton, linux-kernel, linux-mm
On Sat, 31 May 2014, Vlastimil Babka wrote:
> On 05/31/2014 10:33 PM, Hugh Dickins wrote:
> > On Thu, 29 May 2014, Dave Jones wrote:
> >
> >> BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:47
> >> in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
> >> Preemption disabled at:[<ffffffff990acc7e>] vtime_account_system+0x1e/0x50
>
> Just wondering, since I'm not familiar with this kind of bug, is the line above
> bogus or what does it mean? I don't see how the stack trace or the fix patch is
> related to vtime_account_system?
I know no more about it than you do, never noticed such a message before,
and clearly not helpful here. I expect it's like those "last sysfs file"
messages, occasionally useful but mostly noise.
Hugh
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: sleeping function warning from __put_anon_vma
2014-05-31 20:33 ` Hugh Dickins
2014-05-31 21:04 ` Vlastimil Babka
@ 2014-06-01 19:32 ` Peter Zijlstra
2014-06-02 9:30 ` Hugh Dickins
1 sibling, 1 reply; 6+ messages in thread
From: Peter Zijlstra @ 2014-06-01 19:32 UTC (permalink / raw
To: Hugh Dickins; +Cc: Dave Jones, Andrew Morton, linux-kernel, linux-mm
On Sat, May 31, 2014 at 01:33:13PM -0700, Hugh Dickins wrote:
> [PATCH] mm: fix sleeping function warning from __put_anon_vma
>
> Trinity reports BUG:
> sleeping function called from invalid context at kernel/locking/rwsem.c:47
> in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
> __might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
> migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
>
> Right, since conversion to mutex then rwsem, we should not put_anon_vma()
> from inside an rcu_read_lock()ed section: fix the two places that did so.
>
> Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
> Reported-by: Dave Jones <davej@redhat.com>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> Needs-Ack-from: Peter Zijlstra <peterz@infradead.org>
> ---
>
> mm/rmap.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> --- 3.15-rc7/mm/rmap.c 2014-04-13 17:24:36.680507189 -0700
> +++ linux/mm/rmap.c 2014-05-31 12:02:08.496088637 -0700
> @@ -426,12 +426,14 @@ struct anon_vma *page_get_anon_vma(struc
> * above cannot corrupt).
> */
> if (!page_mapped(page)) {
> + rcu_read_unlock();
> put_anon_vma(anon_vma);
> anon_vma = NULL;
> + goto outer;
> }
> out:
> rcu_read_unlock();
> -
> +outer:
> return anon_vma;
> }
I think we can do that without the goto if we write something like:
if (!page_mapped(page)) {
rcu_read_unlock();
put_anon_vma(anon_vma);
return NULL;
}
> @@ -477,9 +479,10 @@ struct anon_vma *page_lock_anon_vma_read
> }
>
> if (!page_mapped(page)) {
> + rcu_read_unlock();
> put_anon_vma(anon_vma);
> anon_vma = NULL;
> - goto out;
> + goto outer;
> }
>
> /* we pinned the anon_vma, its safe to sleep */
> @@ -501,6 +504,7 @@ struct anon_vma *page_lock_anon_vma_read
>
> out:
> rcu_read_unlock();
> +outer:
> return anon_vma;
> }
Same here too, I suppose.
Interesting that we never managed to hit this one; it might also make
sense to put a might_sleep() in anon_vma_free().
Other than that, I don't see anything really odd, then again, its sunday
evening and my thinking cap isn't exactly on proper.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: sleeping function warning from __put_anon_vma
2014-06-01 19:32 ` Peter Zijlstra
@ 2014-06-02 9:30 ` Hugh Dickins
0 siblings, 0 replies; 6+ messages in thread
From: Hugh Dickins @ 2014-06-02 9:30 UTC (permalink / raw
To: Peter Zijlstra
Cc: Hugh Dickins, Dave Jones, Andrew Morton, linux-kernel, linux-mm
On Sun, 1 Jun 2014, Peter Zijlstra wrote:
> On Sat, May 31, 2014 at 01:33:13PM -0700, Hugh Dickins wrote:
> > [PATCH] mm: fix sleeping function warning from __put_anon_vma
> >
> > Trinity reports BUG:
> > sleeping function called from invalid context at kernel/locking/rwsem.c:47
> > in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
> > __might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
> > migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
> >
> > Right, since conversion to mutex then rwsem, we should not put_anon_vma()
> > from inside an rcu_read_lock()ed section: fix the two places that did so.
> >
> > Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
> > Reported-by: Dave Jones <davej@redhat.com>
> > Signed-off-by: Hugh Dickins <hughd@google.com>
> > Needs-Ack-from: Peter Zijlstra <peterz@infradead.org>
> > ---
> >
> > mm/rmap.c | 8 ++++++--
> > 1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > --- 3.15-rc7/mm/rmap.c 2014-04-13 17:24:36.680507189 -0700
> > +++ linux/mm/rmap.c 2014-05-31 12:02:08.496088637 -0700
> > @@ -426,12 +426,14 @@ struct anon_vma *page_get_anon_vma(struc
> > * above cannot corrupt).
> > */
> > if (!page_mapped(page)) {
> > + rcu_read_unlock();
> > put_anon_vma(anon_vma);
> > anon_vma = NULL;
> > + goto outer;
> > }
> > out:
> > rcu_read_unlock();
> > -
> > +outer:
> > return anon_vma;
> > }
>
> I think we can do that without the goto if we write something like:
>
> if (!page_mapped(page)) {
> rcu_read_unlock();
> put_anon_vma(anon_vma);
> return NULL;
> }
Yes, that was my preference too. Then I thought we'd be accused of
mixing early returns and gotos, so did it the goto way. Since we
both prefer the early return, I'll put it back to that.
>
> > @@ -477,9 +479,10 @@ struct anon_vma *page_lock_anon_vma_read
> > }
> >
> > if (!page_mapped(page)) {
> > + rcu_read_unlock();
> > put_anon_vma(anon_vma);
> > anon_vma = NULL;
> > - goto out;
> > + goto outer;
> > }
> >
> > /* we pinned the anon_vma, its safe to sleep */
> > @@ -501,6 +504,7 @@ struct anon_vma *page_lock_anon_vma_read
> >
> > out:
> > rcu_read_unlock();
> > +outer:
> > return anon_vma;
> > }
>
> Same here too, I suppose.
>
> Interesting that we never managed to hit this one; it might also make
> sense to put a might_sleep() in anon_vma_free().
Yes, good idea, that's an excellent place for a might_sleep(): done.
Though it does change the patch from a "push this out immediately" to a
"let's wait a little to check we don't now see lots of new warnings".
But that's okay, we've survived three years without it; and I saw no
no warnings myself from the new patch, when running under load plus
lots of page migration.
>
> Other than that, I don't see anything really odd, then again, its sunday
> evening and my thinking cap isn't exactly on proper.
Thank you - shout if any worries arise once the cap is back on.
I think it's fine, I just felt more comfortable bringing you in.
[PATCH v2] mm: fix sleeping function warning from __put_anon_vma
Trinity reports BUG:
sleeping function called from invalid context at kernel/locking/rwsem.c:47
in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
__might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
Right, since conversion to mutex then rwsem, we should not put_anon_vma()
from inside an rcu_read_lock()ed section: fix the two places that did so.
And add might_sleep() to anon_vma_free(), as suggested by Peter Zijlstra.
Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
---
v2: use early return instead of goto
add might_sleep in anon_vma_free
mm/rmap.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- 3.15-rc8/mm/rmap.c 2014-04-13 17:24:36.680507189 -0700
+++ linux/mm/rmap.c 2014-06-01 13:08:24.432176737 -0700
@@ -103,6 +103,7 @@ static inline void anon_vma_free(struct
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
+ might_sleep();
if (rwsem_is_locked(&anon_vma->root->rwsem)) {
anon_vma_lock_write(anon_vma);
anon_vma_unlock_write(anon_vma);
@@ -426,8 +427,9 @@ struct anon_vma *page_get_anon_vma(struc
* above cannot corrupt).
*/
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
- anon_vma = NULL;
+ return NULL;
}
out:
rcu_read_unlock();
@@ -477,9 +479,9 @@ struct anon_vma *page_lock_anon_vma_read
}
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
- anon_vma = NULL;
- goto out;
+ return NULL;
}
/* we pinned the anon_vma, its safe to sleep */
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-06-02 9:31 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-05-30 0:09 sleeping function warning from __put_anon_vma Dave Jones
2014-05-31 20:33 ` Hugh Dickins
2014-05-31 21:04 ` Vlastimil Babka
2014-05-31 21:16 ` Hugh Dickins
2014-06-01 19:32 ` Peter Zijlstra
2014-06-02 9:30 ` Hugh Dickins
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).