Hello, Le 01/08/2019 à 06:50, Anand Jain a écrit : >> >> So, I've had the issue of 2 FSes so far : >> >> - BTRFS FS on LVM over LUKS on a SATA SSD. >> >> - BTRFS FS directly over LUKS on an USB-3 mechanical HD. >> >> (All this having been perfectly stable until upgrade to 5.2 kernel...) >> > > What kind of btrfs chunk profiles were used here (I guess its either > single or dup)?
Yes, it was the default profiles : - Single data, single metadata on the internal SSD (mounted with the "ssd,discard,noatime" options and no compression. - Single data, DUP metadata on the external USB HD (mounted with the "noatime,compress=zstd" options. I have downgraded the kenel to 5.1.16-arch1-1-ARCH when I restored the machine (before rebooting it) and recreated the SSD BTRFS FS using the latest "Parted Magic" (5.1 kernel). The kernel was the ONLY package I downgraded. The machine has been running like a charm since - as it ever dit - and I'm typing this email on it. (The SSD has passed extended self-tests, SMART tests, and BTRFS has been successfully scrubbed since it was recreated) So I am - for myself - positively sure that the 2 FS corruptions I met were related to Arch kernel 5.2 on this machine, as it happened right after I had upgraded the kernel, had never happened before, and doesn't happen since I downgraded the kernel. I have to add however that I upgraded another little machine to Manjaro kernel 5.2 - after taking a full clone of the FS - and I don't have met any filesystem corruption so far. It is worth noting that Manjaro is the same family as Arch. So even though I have no better logs to provide, here is my experience : - Arch kernel 5.2 : BTRFS over LVM over LUKS on a SSD, and BTRFS over LUKS on an USB HD : 2 filesystem corruptions. Both using numerous snapshots, some were deleted (either by snapper or manually). Downgraded to 5.1 now OK. - Manjaro kernel 5.2 on a small laptop, BTRFS over LUKS on eMMC, no compression, no snapshots, no problem so far. - Manjaro kernel 5.2 on another laptop for a very short while before reverting to 5.1, BTRFS over LVM over LUKS on SSD, a few snapshots, I dunno if some were deleted (snapper) : Still OK. - Manjaro kernel 5.2 on a desktop for a very short while before reverting to 5.1, BTRFS RAID-1 over bcache over LUKS on a 2 HD + 1 SSD mix, a few snapshots, I dunno if some were deleted (snapper) : Still OK. So you see the setups can be a bit complex : Always a LUKS layer, compression used on mechanical HDs, sometimes LVM or bcache, some BTRFS RAID on one system... As far as I can tell, the issue doesn't relate to the most complex setups. I am under the unproved but strong feeling that the mess has something to do with snapshots deletion with kernel 5.2... Dunno if it can be of some help. Kind regards. ॐ -- Swâmi Petaramesh <sw...@petaramesh.org> PGP 9076E32E
