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SubjectRe: Re: Re: XFS deadlock fixed?
From
Hello, everybody.
It appeared that same error message when using kernel version 2.6.38.8 ...

Several lines in /var/log/messages with:
kernel: XFS: possible memory allocation deadlock in kmem_alloc (mode: 0x250)

Does anyone know know if this bug has been fixed in newer versions of
Linux kernel? 3.x maybe?



Thanks.
Kelbel Junior


2011/5/11 Christoph Hellwig <>

And here's the actual patch, sorry:


Index: linux-2.6/fs/xfs/linux-2.6/kmem.c
===================================================================
--- linux-2.6.orig/fs/xfs/linux-2.6/kmem.c 2011-05-11
17:29:51.729191621 +0200

+++ linux-2.6/fs/xfs/linux-2.6/kmem.c 2011-05-11 17:30:22.915689382 +0200
@@ -56,10 +56,12 @@ kmem_alloc(size_t size, unsigned int __n
ptr = kmalloc(size, lflags);
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))

return ptr;
- if (!(++retries % 100))
+ if (!(++retries % 100)) {
xfs_err(NULL,
"possible memory allocation deadlock in %s (mode:0x%x)",
__func__, lflags);
+ dump_stack();
+ }
congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1);
}
@@ -112,10 +114,12 @@ kmem_zone_alloc(kmem_zone_t *zone, unsig
ptr = kmem_cache_alloc(zone, lflags);
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))

return ptr;
- if (!(++retries % 100))
+ if (!(++retries % 100)) {
xfs_err(NULL,
"possible memory allocation deadlock in %s (mode:0x%x)",
__func__, lflags);
+ dump_stack();
+ }
congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1);
}

2011/5/11 Christoph Hellwig <>

You're probably running into a different issue. Any chance you can try
the attached patch to see where you're stuck exactly?

Also in case you're using slub (CONFIG_SLUB) can you check if it still

happens when using slab (CONFIG_SLAB) instead?


2011/5/10 Felipe Wilhelms Damasio - Taghos <>

Hi Mr. Hellwig,

I saw the XFS deadlock thread regarding 2.6.38:

http://www.linux.sgi.com/archives/xfs/2011-03/msg00185.html


I'm seeing too in 2.6.38.4. A lot of

XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250)

I checked the changelog for 2.6.38.6 and can't be sure
if the fix got
in...could you tell me if it did?


Thanks,

--

Felipe Wilhelms Damasio


TAGHOS - Tecnologia
Rua Prof. Alvaro Alvim, 211
Porto Alegre - RS - (51) 3239-3180
www.taghos.com.br <http://www.taghos.com.br/>


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