On Thu, 2019-06-06 at 19:38 +0800, Coly Li wrote: > What is your gcc version ? That Gentoo had some gcc-9.1 enabled, however the running kernel was created earlier, probably using gcc-8.3.0. The OpenSuse TW live where I tried to register the caching device manually, I don't know what the kernel and tools are built with. zypper info gcc says 9-1.2, so I guess this was the toolchain for creation as well. > This one is important, if I can have the kernel message or call trace > of this segfault it will be very helpful. That one I don't have anymore. I can try with some 5.1.5 kernel later.. > > Is my bcache definitely lost? > I am not sure for the dirty data on cache, but for the backing device > you may have most of data back. Considering there is btrfs on top of > it, a fsck is required. > > You may try to run the backing device wihtout attaching cache device by: > echo 1 > /sys/block/bcache0/bcache/running Read my initial post, I did so. I was able to do a luksOpen. But the btrfs inside was corrupted when I tried 'filesystem check' and 'mount' on that. Best regards, Massimo
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