Re: A lot warnings in dmesg while running thunderbird

[Adam Borowski <kilobyte@angband.pl>]

On Fri, Jul 08, 2016 at 08:21:16PM +0200, Adam Borowski wrote:
> On Fri, Jul 08, 2016 at 12:02:35PM -0400, Chris Mason wrote:
> > On 07/08/2016 11:02 AM, Gabriel C wrote:
> > > [btrfs_destroy_inode again]
> 
> > Can you please run the attached test program:
> > 
> > gcc -o short-write short-write.c -lpthread
> > ./short-write some-new-file-on-btrfs
> > 
> > I want to see if you're triggering the same problem we've tried to fix, or
> > something else.
> 
> Looks like same, 4.6.3:
[...]
> ... and sda1 is goes ro.
> Single device, noatime,compress=lzo,ssd.
> 
> It's somewhat puzzling that back in the day applying 56244ef15 stopped this
> reproducer for me, yet somehow it triggers again.

The above on 4.6.3 triggered pretty immediately.  I then compiled fresh
4.7-rc6+ (today's Linus' master), which did trigger only after a lot of time
and effort.  First I tried on freshly formatted 2TB spinning rust, no luck.
Then on 1GB rust, almost full of a mixture of crap.  Then on my regular ssd
-- it survived an hour of so with little concurrent use, then went boom only
late of a kernel compile on that filesystem.

Same backtrace.

-- 
An imaginary friend squared is a real enemy.