Read corruption on ARM

[Eric Sandeen]

On 2/27/13 10:50 PM, Eric Sandeen wrote:
> On 2/27/13 10:38 PM, Eric Sandeen wrote:
> 
> ...
> 
>> re-cc'ing xfs list
>>
>> So I used pahole to look at all structs, objdump -d to disassemble,
>> and md5sum'd the results to see what's different.
>>
>> pi at raspberrypi ~ $ md5sum cross/*.dis cross/*.pahole native/*.dis native/*.pahole
>>
>> <manual sort>
>>
>> c0abd80c3bf049db5e1909fd851261cc  cross/xfs-O1-g.ko.pahole
>> c0abd80c3bf049db5e1909fd851261cc  cross/xfs-O2-g.ko.pahole
>> c0abd80c3bf049db5e1909fd851261cc  cross/xfs-Os-g.ko.pahole
>> c0abd80c3bf049db5e1909fd851261cc  native/xfs-O1-g.ko.pahole
>> c0abd80c3bf049db5e1909fd851261cc  native/xfs-O2-g.ko.pahole
>> c0abd80c3bf049db5e1909fd851261cc  native/xfs-Os-g.ko.pahole
>>
>> so all structures look identical, good - but:
>>
>> while disassembly of these two modules match:
>>
>> d76f6ebf4d8a1b9f786facefbcf16f69  cross/xfs-O1-g.ko.dis
>> d76f6ebf4d8a1b9f786facefbcf16f69  native/xfs-O1-g.ko.dis
>>
>> do you see the problem w/ the cross-compiled xfs-O1-g.ko as well?
>>
>> the others differ:
>>
>> 349f3490a49f2ce539c2b058914f64f0  native/xfs-Os-g.ko.dis
>> 91c8e8230774808b538c21a83106a5d7  cross/xfs-Os-g.ko.dis
>>
>> 649338e1b8eeed6a294504fc76a39cb0  native/xfs-O2-g.ko.dis
>> e52c2a48277326c313bba76aa0b33ab7  cross/xfs-O2-g.ko.dis
>>
>> The diff of the disassembly of the others is huge, hard to
>> know where to start just yet.  Need an objdump mode that only
>> shows function-relative addresses or something to cut down
>> on the noise.
> 
> Could you try the same, to isolate the differences: objdump -d
> all of the *.o files for, say, the -O2 build, md5sum & compare,
> and see which ones differ?

And one more test.  Every time you hit the error, it causes
a log replay on the next mount since the fs has shut down.

Can you try

# mount; umount; mount; test

so that you start the test from a clean mount, and see if you still hit it?

Maybe save that image off before you do that test just in case it changes
the state.

-Eric