Re: A lot warnings in dmesg while running thunderbird

[Chris Mason <clm@fb.com>]

On Mon, Jul 11, 2016 at 11:28:01AM +0530, Chandan Rajendra wrote:
>On Friday, July 08, 2016 12:02:35 PM Chris Mason wrote:
>>
>> 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.
>>
>
>Hi Chris,
>
>I am able to reproduce the issue with the 'short-write' program. But before
>the call trace associated with btrfs_destroy_inode(), I see the following call
>trace ...
>
>------------[ cut here ]------------
>WARNING: CPU: 2 PID: 2311 at /home/chandan/repos/linux/fs/btrfs/extent-tree.c:4303 btrfs_free_reserved_data_space_noquota+0xe8/0x100
>Modules linked in:

[ ... ]

>
>I will continue to debug and find out the root cause.

Thanks Chandan, I'm able to reproduce the same thing more easily by changing
short-write to have:

#define ROUNDS 4096

and by getting rid of the sync_file_range call.

Still nailing down where the accounting is going wrong, so any help is
appreciated.

-chris