I had another btrfs crash with identical symptoms. This time I managed
to reproduce the crash and identify the root cause. It turns out that
the Apple boot firmware is buggy and leaves wifi DMA turned on, which
randomly corrupts memory after Linux is running.
https://bugzilla.kernel.org/show_bug.cg
On Wed, Jan 06, 2016 at 08:57:28AM +0800, Qu Wenruo wrote:
>
> Since you took the image of the corrupted fs, would you please try the
> following commands on the corrupted fs?
>
> $ btrfs-debug-tree -b 67239936
Command runs then segfaults:
leaf 67239936 items 92 free space 9138 generation 2766
On 5 January 2016 at 01:57, Qu Wenruo wrote:
>>
>> Data, single: total=106.79GiB, used=82.01GiB
>> System, single: total=4.00MiB, used=16.00KiB
>> Metadata, single: total=2.01GiB, used=1.51GiB
>> GlobalReserve, single: total=512.00MiB, used=0.00B
>
>
> That's the btrfs fi df misleading output conf
Kernel 4.4.0-rc7
System is Macbook with 109GB btrfs partition on SSD
System crashed (nothing in syslog, could have been btrfs or possibly GPU fault
shortly after running xrandr). After hard reset the btrfs partition was corrupt
and would not mount. I took an image of the partition (some of the out
