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XFS memory allocation deadlock in 2.6.38

To: "'linux-xfs@xxxxxxxxxxx'" <linux-xfs@xxxxxxxxxxx>
Subject: XFS memory allocation deadlock in 2.6.38
From: Sean Noonan <Sean.Noonan@xxxxxxxxxxxx>
Date: Fri, 18 Mar 2011 11:46:04 -0400
Accept-language: en-US
Acceptlanguage: en-US
Cc: Martin Bligh <Martin.Bligh@xxxxxxxxxxxx>, Trammell Hudson <Trammell.Hudson@xxxxxxxxxxxx>
Thread-index: Acvlg5bPEZfcOKXrRzaJSHBjGQAhJA==
Thread-topic: XFS memory allocation deadlock in 2.6.38
Using the attached program, we are able to reproduce this bug reliably.
$ make vmtest
$ ./vmtest /xfs/hugefile.dat $(( 16 * 1024 * 1024 * 1024 )) # vmtest 
<path_to_file> <size_in_bytes>
/xfs/hugefile.dat: mapped 17179869184 bytes in 33822066943 ticks
749660: avg 13339 max 234667 ticks
371945: avg 26885 max 281616 ticks
---
At this point, we see the following on the console:
[593492.694806] XFS: possible memory allocation deadlock in kmem_alloc 
(mode:0x250)
[593506.724367] XFS: possible memory allocation deadlock in kmem_alloc 
(mode:0x250)
[593524.837717] XFS: possible memory allocation deadlock in kmem_alloc 
(mode:0x250)
[593556.742386] XFS: possible memory allocation deadlock in kmem_alloc 
(mode:0x250)

This is the same message presented in
http://oss.sgi.com/bugzilla/show_bug.cgi?id=410

We started testing with 2.6.38-rc7 and have seen this bug through to the .0 
release.  This does not appear to be present in 2.6.33, but we have not done 
testing in between.  We have tested with ext4 and do not encounter this bug.
CONFIG_XFS_FS=y
CONFIG_XFS_QUOTA=y
CONFIG_XFS_POSIX_ACL=y
CONFIG_XFS_RT=y
# CONFIG_XFS_DEBUG is not set
# CONFIG_VXFS_FS is not set

Here is the stack from the process:
[<ffffffff81357553>] call_rwsem_down_write_failed+0x13/0x20
[<ffffffff812ddf1e>] xfs_ilock+0x7e/0x110
[<ffffffff8130132f>] __xfs_get_blocks+0x8f/0x4e0
[<ffffffff813017b1>] xfs_get_blocks+0x11/0x20
[<ffffffff8114ba3e>] __block_write_begin+0x1ee/0x5b0
[<ffffffff8114be9d>] block_page_mkwrite+0x9d/0xf0
[<ffffffff81307e05>] xfs_vm_page_mkwrite+0x15/0x20
[<ffffffff810f2ddb>] do_wp_page+0x54b/0x820
[<ffffffff810f347c>] handle_pte_fault+0x3cc/0x820
[<ffffffff810f5145>] handle_mm_fault+0x175/0x2f0
[<ffffffff8102e399>] do_page_fault+0x159/0x470
[<ffffffff816cf6cf>] page_fault+0x1f/0x30
[<ffffffffffffffff>] 0xffffffffffffffff

# uname -a
Linux testhost 2.6.38 #2 SMP PREEMPT Fri Mar 18 15:00:59 GMT 2011 x86_64 
GNU/Linux

Please let me know if additional information is required.

Thanks!

Sean 

Attachment: vmtest.c
Description: vmtest.c

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