Re: kernel BUG in __xfs_get_blocks at fs/xfs/linux-2.6/xfs_aops.c:1293!

Andrew Morton wrote:

On Thu, 31 Aug 2006 18:17:26 +1000
David Chinner <dgc@xxxxxxx> wrote:



BTW, I have CONFIG_PPC_64K_PAGES enabled.


But that might be a good place to start. Can you see if you can
reproduce the problem without this config option set?



It would be useful to compare the compiler warning output for 64k pages
versus that for smaller-pages.

Several quite worrisome-looking warnings are emitted from various parts of
the kernel with 64k pages. Related to arithmetic on short types.


1. the config diff
blade10:/boot # diff config-2.6.18-rc5-ppc64 config-2.6.18-rc5-ppc64.64kp
4c4
< # Thu Aug 31 18:25:42 2006
---
> # Thu Aug 31 21:18:52 2006
51c51
< CONFIG_LOCALVERSION="-ppc64"
---
> CONFIG_LOCALVERSION="-ppc64.64kp"
173c173
< CONFIG_FORCE_MAX_ZONEORDER=13
---
> CONFIG_FORCE_MAX_ZONEORDER=9
204c204
< # CONFIG_PPC_64K_PAGES is not set
---
> CONFIG_PPC_64K_PAGES=y

2. the compiler warning diff
ltctest:~ # diff 4k.warning 64k.warning
0a1,5
> kernel/power/pm.c:205: warning: ‘pm_register’ is deprecated (declared at kernel/power/pm.c:64)
> kernel/power/pm.c:205: warning: ‘pm_register’ is deprecated (declared at kernel/power/pm.c:64)
> kernel/power/pm.c:206: warning: ‘pm_send_all’ is deprecated (declared at kernel/power/pm.c:180)
> kernel/power/pm.c:206: warning: ‘pm_send_all’ is deprecated (declared at kernel/power/pm.c:180)
> fs/bio.c:169: warning: ‘idx’ may be used uninitialized in this function
8,13d12
< fs/bio.c:169: warning: ‘idx’ may be used uninitialized in this function
< kernel/power/pm.c:205: warning: ‘pm_register’ is deprecated (declared at kernel/power/pm.c:64)
< kernel/power/pm.c:205: warning: ‘pm_register’ is deprecated (declared at kernel/power/pm.c:64)
< kernel/power/pm.c:206: warning: ‘pm_send_all’ is deprecated (declared at kernel/power/pm.c:180)
< kernel/power/pm.c:206: warning: ‘pm_send_all’ is deprecated (declared at kernel/power/pm.c:180)
< fs/eventpoll.c:500: warning: ‘fd’ may be used uninitialized in this function
17a17,27
> fs/eventpoll.c:500: warning: ‘fd’ may be used uninitialized in this function
> fs/fat/inode.c:1227: warning: comparison is always false due to limited range of data type
> fs/hfs/btree.c:243: warning: comparison is always false due to limited range of data type
> fs/hfsplus/btree.c:235: warning: comparison is always false due to limited range of data type
> fs/ocfs2/vote.c:774: warning: ‘response’ may be used uninitialized in this function
> fs/ocfs2/dlm/dlmdomain.c:70: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 7 has type ‘int’
> fs/ocfs2/dlm/dlmdomain.c:70: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 7 has type ‘int’
> fs/ocfs2/dlm/dlmdomain.c:70: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 7 has type ‘int’
> fs/ocfs2/dlm/dlmdomain.c:918: warning: ‘response’ may be used uninitialized in this function
> fs/udf/balloc.c:751: warning: ‘goal_eloc.logicalBlockNum’ may be used uninitialized in this function
> fs/udf/super.c:1364: warning: ‘ino.partitionReferenceNum’ may be used uninitialized in this function
56a67,68
> drivers/usb/core/devio.c:620: warning: comparison is always false due to limited range of data type
> drivers/net/r8169.c:2131: warning: ‘txd’ may be used uninitialized in this function
59d70
< drivers/net/r8169.c:2131: warning: ‘txd’ may be used uninitialized in this function
70,73c81
< fs/ocfs2/vote.c:774: warning: ‘response’ may be used uninitialized in this function
< fs/ocfs2/dlm/dlmdomain.c:918: warning: ‘response’ may be used uninitialized in this function
< fs/udf/balloc.c:751: warning: ‘goal_eloc.logicalBlockNum’ may be used uninitialized in this function
< fs/udf/super.c:1364: warning: ‘ino.partitionReferenceNum’ may be used uninitialized in this function
---
> net/key/af_key.c:403: warning: comparison is always false due to limited range of data type


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