[Bug 203947] [xfstests generic/475]: general protection fault: 0000 [#1] RIP: 0010:xfs_setfilesize_ioend+0xb1/0x220 [xfs]

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https://bugzilla.kernel.org/show_bug.cgi?id=203947

--- Comment #13 from Zorro Lang (zlang@redhat.com) ---
(In reply to Luis Chamberlain from comment #12)
> (In reply to Zorro Lang from comment #11)
> > (In reply to Zorro Lang from comment #10)
> > > (In reply to Darrick J. Wong from comment #9)
> > > > Zorro,
> > > > 
> > > > If you get a chance, can you try this debugging patch, please?
> > > 
> > > Sure, I'll give it a try. With this bug together ... they both triggered
> by
> > > g/475. You really write a nice case :)
> > > 
> > > Both these two bugs are too hard to reproduce, so I only can try my best
> to
> > > test it, but I can't 100% verify they're fixed even if all test pass,
> I'll
> > > try to approach 99% :-P
> > > 
> > > BTW, if this's a separate bug, I'd like to report a new bug to track it,
> to
> > > avoid confusion.
> > > 
> > > Thanks,
> > > Zorro
> > 
> > Updata: By merging the patches in comment 2 and comment 9, I can't
> reproduce
> > this bug and https://bugzilla.kernel.org/show_bug.cgi?id=204031, after
> > running generic/475 on six different machines 3 days.
> 
> Can you try with just the patch in comment 2? Also it doesn't seem clear to
> me yet if this is a regression or not. Did this used to work? If not sure
> can you try with v4.19 and see if the issue also appears there?

I didn't try to make sure if it's a regression or not. Due to
1. This bug is very hard to be reproduced.
2. The reproducer(generic/475) might easily to trigger some other issues on old
kernel.

Any way, I'll give it a try on v4.19, but I can't promise that I can find out
if it's a regression:)

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