* Re: [PATCH] slub: missing test for partial pages flush work in flush_all
[not found] ` <alpine.DEB.2.00.1205111113460.31049@router.home>
@ 2012-05-13 6:53 ` Gilad Ben-Yossef
2012-05-16 11:05 ` Jeff Layton
2012-05-14 1:09 ` majianpeng
1 sibling, 1 reply; 4+ messages in thread
From: Gilad Ben-Yossef @ 2012-05-13 6:53 UTC (permalink / raw)
To: Christoph Lameter
Cc: majianpeng, linux-mm, Pekka Enberg, linux-kernel, Andrew Morton
On Fri, May 11, 2012 at 7:14 PM, Christoph Lameter <cl@linux.com> wrote:
> Didn't I already ack this before?
>
> Acked-by: Christoph Lameter <cl@linux.com>
>
Yes, you did, but the patch description and title was lacking and
Majianpeng kindly fixed it, hence the re-send, I guess.
I've added Andrew, since he took my original commit that introduces
the bug that this patch by Majianpeng fixes (and also LKML).
This fix really needs to get into 3.4, otherwise we'll be breaking
slub. What's the best way to go about that?
Thanks!
Gilad
> On Fri, 11 May 2012, majianpeng wrote:
>
>> Subject: [PATCH] slub: missing test for partial pages flush work in flush_all
>>
>> Find some kernel message like:
>> SLUB raid5-md127: kmem_cache_destroy called for cache that still has objects.
>> Pid: 6143, comm: mdadm Tainted: G O 3.4.0-rc6+ #75
>> Call Trace:
>> [<ffffffff811227f8>] kmem_cache_destroy+0x328/0x400
>> [<ffffffffa005ff1d>] free_conf+0x2d/0xf0 [raid456]
>> [<ffffffffa0060791>] stop+0x41/0x60 [raid456]
>> [<ffffffffa000276a>] md_stop+0x1a/0x60 [md_mod]
>> [<ffffffffa000c974>] do_md_stop+0x74/0x470 [md_mod]
>> [<ffffffffa000d0ff>] md_ioctl+0xff/0x11f0 [md_mod]
>> [<ffffffff8127c958>] blkdev_ioctl+0xd8/0x7a0
>> [<ffffffff8115ef6b>] block_ioctl+0x3b/0x40
>> [<ffffffff8113b9c6>] do_vfs_ioctl+0x96/0x560
>> [<ffffffff8113bf21>] sys_ioctl+0x91/0xa0
>> [<ffffffff816e9d22>] system_call_fastpath+0x16/0x1b
>>
>> Then using kmemleak can found those messages:
>> unreferenced object 0xffff8800b6db7380 (size 112):
>> comm "mdadm", pid 5783, jiffies 4294810749 (age 90.589s)
>> hex dump (first 32 bytes):
>> 01 01 db b6 ad 4e ad de ff ff ff ff ff ff ff ff .....N..........
>> ff ff ff ff ff ff ff ff 98 40 4a 82 ff ff ff ff .........@J.....
>> backtrace:
>> [<ffffffff816b52c1>] kmemleak_alloc+0x21/0x50
>> [<ffffffff8111a11b>] kmem_cache_alloc+0xeb/0x1b0
>> [<ffffffff8111c431>] kmem_cache_open+0x2f1/0x430
>> [<ffffffff8111c6c8>] kmem_cache_create+0x158/0x320
>> [<ffffffffa008f979>] setup_conf+0x649/0x770 [raid456]
>> [<ffffffffa009044b>] run+0x68b/0x840 [raid456]
>> [<ffffffffa000bde9>] md_run+0x529/0x940 [md_mod]
>> [<ffffffffa000c218>] do_md_run+0x18/0xc0 [md_mod]
>> [<ffffffffa000dba8>] md_ioctl+0xba8/0x11f0 [md_mod]
>> [<ffffffff81272b28>] blkdev_ioctl+0xd8/0x7a0
>> [<ffffffff81155bfb>] block_ioctl+0x3b/0x40
>> [<ffffffff811326d6>] do_vfs_ioctl+0x96/0x560
>> [<ffffffff81132c31>] sys_ioctl+0x91/0xa0
>> [<ffffffff816dd3a2>] system_call_fastpath+0x16/0x1b
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> This bug introduced by Commit a8364d5555b2030d093cde0f0795.The
>> commit did not include checks for per cpu partial pages being present on a
>> cpu.
>>
>> Signed-off-by: majianpeng <majianpeng@gmail.com>
>> ---
>> mm/slub.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/mm/slub.c b/mm/slub.c
>> index ffe13fd..6fce08f 100644
>> --- a/mm/slub.c
>> +++ b/mm/slub.c
>> @@ -2040,7 +2040,7 @@ static bool has_cpu_slab(int cpu, void *info)
>> struct kmem_cache *s = info;
>> struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
>>
>> - return !!(c->page);
>> + return c->page || c->partial;
>> }
>>
>> static void flush_all(struct kmem_cache *s)
>>
--
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@benyossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com
"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
-- Jean-Baptiste Queru
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Re: [PATCH] slub: missing test for partial pages flush work in flush_all
[not found] ` <alpine.DEB.2.00.1205111113460.31049@router.home>
2012-05-13 6:53 ` [PATCH] slub: missing test for partial pages flush work in flush_all Gilad Ben-Yossef
@ 2012-05-14 1:09 ` majianpeng
2012-05-14 13:45 ` Christoph Lameter
1 sibling, 1 reply; 4+ messages in thread
From: majianpeng @ 2012-05-14 1:09 UTC (permalink / raw)
To: Gilad Ben-Yossef, Christoph Lameter
Cc: linux-mm, Pekka Enberg, linux-kernel, Andrew Morton
On Fri, May 11, 2012 at 7:14 PM, Christoph Lameter <cl@linux.com> wrote:
> Didn't I already ack this before?
>
> Acked-by: Christoph Lameter <cl@linux.com>
>
>Yes, you did, but the patch description and title was lacking and
>Majianpeng kindly fixed it, hence the re-send, I guess.
>I've added Andrew, since he took my original commit that introduces
>the bug that this patch by Majianpeng fixes (and also LKML).
>This fix really needs to get into 3.4, otherwise we'll be breaking
>slub. What's the best way to go about that?
>Thanks!
>Gilad
Sorry for late to relay. I rewrited the comment and resend.
I have a question to ask:because the patch fixed by others,for example Christoph Lameter, Gilad.
Should I add sogine-off by them in the patch?
Thanks all!
------------------
majianpeng
2012-05-14
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Re: [PATCH] slub: missing test for partial pages flush work in flush_all
2012-05-14 1:09 ` majianpeng
@ 2012-05-14 13:45 ` Christoph Lameter
0 siblings, 0 replies; 4+ messages in thread
From: Christoph Lameter @ 2012-05-14 13:45 UTC (permalink / raw)
To: majianpeng
Cc: Gilad Ben-Yossef, linux-mm, Pekka Enberg, linux-kernel,
Andrew Morton
On Mon, 14 May 2012, majianpeng wrote:
> Sorry for late to relay. I rewrited the comment and resend.
> I have a question to ask:because the patch fixed by others,for example Christoph Lameter, Gilad.
> Should I add sogine-off by them in the patch?
I 6hink its fine the way it is.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] slub: missing test for partial pages flush work in flush_all
2012-05-13 6:53 ` [PATCH] slub: missing test for partial pages flush work in flush_all Gilad Ben-Yossef
@ 2012-05-16 11:05 ` Jeff Layton
0 siblings, 0 replies; 4+ messages in thread
From: Jeff Layton @ 2012-05-16 11:05 UTC (permalink / raw)
To: Gilad Ben-Yossef
Cc: Christoph Lameter, majianpeng, linux-mm, Pekka Enberg,
linux-kernel, Andrew Morton
On Sun, 13 May 2012 09:53:15 +0300
Gilad Ben-Yossef <gilad@benyossef.com> wrote:
> On Fri, May 11, 2012 at 7:14 PM, Christoph Lameter <cl@linux.com> wrote:
> > Didn't I already ack this before?
> >
> > Acked-by: Christoph Lameter <cl@linux.com>
> >
>
> Yes, you did, but the patch description and title was lacking and
> Majianpeng kindly fixed it, hence the re-send, I guess.
>
> I've added Andrew, since he took my original commit that introduces
> the bug that this patch by Majianpeng fixes (and also LKML).
>
> This fix really needs to get into 3.4, otherwise we'll be breaking
> slub. What's the best way to go about that?
>
> Thanks!
> Gilad
>
> > On Fri, 11 May 2012, majianpeng wrote:
> >
> >> Subject: [PATCH] slub: missing test for partial pages flush work in flush_all
> >>
> >> Find some kernel message like:
> >> SLUB raid5-md127: kmem_cache_destroy called for cache that still has objects.
> >> Pid: 6143, comm: mdadm Tainted: G O 3.4.0-rc6+ #75
> >> Call Trace:
> >> [<ffffffff811227f8>] kmem_cache_destroy+0x328/0x400
> >> [<ffffffffa005ff1d>] free_conf+0x2d/0xf0 [raid456]
> >> [<ffffffffa0060791>] stop+0x41/0x60 [raid456]
> >> [<ffffffffa000276a>] md_stop+0x1a/0x60 [md_mod]
> >> [<ffffffffa000c974>] do_md_stop+0x74/0x470 [md_mod]
> >> [<ffffffffa000d0ff>] md_ioctl+0xff/0x11f0 [md_mod]
> >> [<ffffffff8127c958>] blkdev_ioctl+0xd8/0x7a0
> >> [<ffffffff8115ef6b>] block_ioctl+0x3b/0x40
> >> [<ffffffff8113b9c6>] do_vfs_ioctl+0x96/0x560
> >> [<ffffffff8113bf21>] sys_ioctl+0x91/0xa0
> >> [<ffffffff816e9d22>] system_call_fastpath+0x16/0x1b
> >>
> >> Then using kmemleak can found those messages:
> >> unreferenced object 0xffff8800b6db7380 (size 112):
> >> comm "mdadm", pid 5783, jiffies 4294810749 (age 90.589s)
> >> hex dump (first 32 bytes):
> >> 01 01 db b6 ad 4e ad de ff ff ff ff ff ff ff ff .....N..........
> >> ff ff ff ff ff ff ff ff 98 40 4a 82 ff ff ff ff .........@J.....
> >> backtrace:
> >> [<ffffffff816b52c1>] kmemleak_alloc+0x21/0x50
> >> [<ffffffff8111a11b>] kmem_cache_alloc+0xeb/0x1b0
> >> [<ffffffff8111c431>] kmem_cache_open+0x2f1/0x430
> >> [<ffffffff8111c6c8>] kmem_cache_create+0x158/0x320
> >> [<ffffffffa008f979>] setup_conf+0x649/0x770 [raid456]
> >> [<ffffffffa009044b>] run+0x68b/0x840 [raid456]
> >> [<ffffffffa000bde9>] md_run+0x529/0x940 [md_mod]
> >> [<ffffffffa000c218>] do_md_run+0x18/0xc0 [md_mod]
> >> [<ffffffffa000dba8>] md_ioctl+0xba8/0x11f0 [md_mod]
> >> [<ffffffff81272b28>] blkdev_ioctl+0xd8/0x7a0
> >> [<ffffffff81155bfb>] block_ioctl+0x3b/0x40
> >> [<ffffffff811326d6>] do_vfs_ioctl+0x96/0x560
> >> [<ffffffff81132c31>] sys_ioctl+0x91/0xa0
> >> [<ffffffff816dd3a2>] system_call_fastpath+0x16/0x1b
> >> [<ffffffffffffffff>] 0xffffffffffffffff
> >>
> >> This bug introduced by Commit a8364d5555b2030d093cde0f0795.The
> >> commit did not include checks for per cpu partial pages being present on a
> >> cpu.
> >>
> >> Signed-off-by: majianpeng <majianpeng@gmail.com>
> >> ---
> >> mm/slub.c | 2 +-
> >> 1 files changed, 1 insertions(+), 1 deletions(-)
> >>
> >> diff --git a/mm/slub.c b/mm/slub.c
> >> index ffe13fd..6fce08f 100644
> >> --- a/mm/slub.c
> >> +++ b/mm/slub.c
> >> @@ -2040,7 +2040,7 @@ static bool has_cpu_slab(int cpu, void *info)
> >> struct kmem_cache *s = info;
> >> struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
> >>
> >> - return !!(c->page);
> >> + return c->page || c->partial;
> >> }
> >>
> >> static void flush_all(struct kmem_cache *s)
> >>
>
>
>
FWIW, this patch fixed a similar warning that I was seeing on module
unload with cifs.ko. I agree it would be good to get it in for 3.4...
Tested-by: Jeff Layton <jlayton@redhat.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
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[not found] ` <alpine.DEB.2.00.1205111113460.31049@router.home>
2012-05-13 6:53 ` [PATCH] slub: missing test for partial pages flush work in flush_all Gilad Ben-Yossef
2012-05-16 11:05 ` Jeff Layton
2012-05-14 1:09 ` majianpeng
2012-05-14 13:45 ` Christoph Lameter
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