Ubuntu
linux package

  1. Bug #1894780
  2. Comment #10

Comment 10 for bug 1894780

Revision history for this message
William Grant (wgrant) wrote :

As expected, it's easy enough to repro with raw dm_snapshot:

  root@bug-1894780-focal-3:~# for f in base snap1 snap2; do dd if=/dev/zero of=$f.img bs=1M count=1 seek=512; done
  root@bug-1894780-focal-3:~# losetup -f base.img
  root@bug-1894780-focal-3:~# losetup -f snap1.img
  root@bug-1894780-focal-3:~# losetup -f snap2.img
  root@bug-1894780-focal-3:~# dmsetup create snap-base --table "0 524288 snapshot-origin /dev/loop3"
  root@bug-1894780-focal-3:~# for i in 4 5; do dmsetup create snap-$i --table "0 524288 snapshot /dev/mapper/snap-base /dev/loop$i P 16" & done

It works fine once you sneak a "sleep 1" into the loop.