Hi, This is Linux kernel 5.7.6 (the Debian package, 5.7.6-1). So, I wanted to try out this new quicker balance interrupt thing, and the result was that I could crash the fs at my very first try using it, which was simply doing balance, and then pressing Ctrl-C. Recipe to reproduce: Start balance, wait a few seconds, then press Ctrl-C. For me here, ~ 5 out of 10 times, it ends up exploding: -# btrfs balance start --full /btrfs/ ^C [41190.572977] BTRFS info (device xvdb): balance: start -d -m -s [41190.573035] BTRFS info (device xvdb): relocating block group 73001861120 flags metadata [41205.409600] BTRFS info (device xvdb): found 12236 extents, stage: move data extents [41205.509316] BTRFS info (device xvdb): relocating block group 71928119296 flags data [41205.695319] BTRFS info (device xvdb): found 3 extents, stage: move data extents [41205.723009] BTRFS info (device xvdb): found 3 extents, stage: update data pointers [41205.750590] BTRFS info (device xvdb): relocating block group 60922265600 flags metadata [41208.183424] BTRFS: error (device xvdb) in btrfs_drop_snapshot:5505: errno=-4 unknown [41208.183450] BTRFS info (device xvdb): forced readonly [41208.183469] BTRFS info (device xvdb): balance: ended with status: -4 Boom, readonly FS. Hans
