Hi, When I run xfstests generic/081 over virtio-scsi, loop or virtio-blk, the following snapshot error and IO failure is alwasy observed in linus v4.5+. Thanks, [1], dmesg log [ 374.794520] EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: (null) [ 392.894924] device-mapper: snapshots: Invalidating snapshot: Unable to allocate exception. [ 392.904760] EXT4-fs warning (device dm-3): ext4_end_bio:314: I/O error -5 writing to inode 12 (offset 4194304 size 1048576 starting block 14337) [ 392.905336] EXT4-fs warning (device dm-3): ext4_end_bio:314: I/O error -5 writing to inode 12 (offset 0 size 2097152 starting block 10241) [ 392.905340] Buffer I/O error on device dm-3, logical block 10241 [ 392.905342] Buffer I/O error on device dm-3, logical block 10242 [ 392.905343] Buffer I/O error on device dm-3, logical block 10243 [ 392.905345] Buffer I/O error on device dm-3, logical block 10244 [ 392.905349] Buffer I/O error on device dm-3, logical block 10245 [ 392.905351] Buffer I/O error on device dm-3, logical block 10246 [ 392.905352] Buffer I/O error on device dm-3, logical block 10247 [ 392.905353] Buffer I/O error on device dm-3, logical block 10248 [ 392.905355] Buffer I/O error on device dm-3, logical block 10249 [ 392.905357] Buffer I/O error on device dm-3, logical block 10250 [ 392.906708] EXT4-fs warning (device dm-3): ext4_end_bio:314: I/O error -5 writing to inode 12 (offset 0 size 2097152 starting block 11265) [ 392.949341] EXT4-fs warning (device dm-3): ext4_end_bio:314: I/O error -5 writing to inode 12 (offset 2097152 size 2097152 starting block 12289) [ 392.956143] EXT4-fs warning (device dm-3): ext4_end_bio:314: I/O error -5 writing to inode 12 (offset 2097152 size 2097152 starting block 13313) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
