On Thu, Mar 24, 2016 at 9:25 PM, Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > On Thu, Mar 24 2016 at 8:23am -0400, > Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote: > >> 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+. > > The only snapshot specific changes that went into 4.5+ are: > > 385277b dm snapshot: fix hung bios when copy error occurs > 808e621 dm snapshot: disallow the COW and origin devices from being identical > > Neither of which should result in "Unable to allocate exception" due to > -ENOMEM. > > But commit 385277b does touch relevant code-paths though so you might > try reverting it and see if your problem goes away. > > If that doesn't help then you'll have to do a bisect. I don't know where to start the bisect, and looks v4.0 has the issue too. Thanks, > > Mike > >> [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
