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Which kernel, and did you file a bug report?

e: To anyone not up on btrfs, its features are closely tied to the kernel version it's used with. For example, raid56 scrub and device replace, and recovery and rebuild code were not available prior to kernel 3.19.

I also believe the only way to use 5/6 modes before they were stable was to explicitly compile with them enabled. It wasn't just something you could accidentally do.

It was 4.2.5-1-ARCH, and I didn't file a bug report, no.

I didn't have much data to submit. No kernel panics, no useful error messages, nothing beyond it saying it wouldn't mount. One could read the tea leaves from the filesystem as it sat, but such data spelunking could take a while on an 8TB partition, and I wanted to get the disks back into use.

I didn't notice the corruption until after I had unmounted it, so scrubbing it wasn't an option.

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