Comment 4 for bug 1646565

I have not been running Ubuntu on this machine so can't say if it works on any earlier version.

I verified that the problem is still there with mainline kernel v4.9-rc7.

After this problem happens it is not possible to unmount the drive so I am not able to reboot the machine properly. After a power button forced reboot running fsck reports errors like this:

fsck från util-linux 2.28.2
** /dev/sdc2
 Using cacheBlockSize=32K cacheTotalBlock=1024 cacheSize=32768K.
** Checking HFS Plus volume.
** Detected a case-sensitive catalog.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking Catalog hierarchy.
   Invalid directory item count
   (It should be 0 instead of 80)
   Invalid directory item count
   (It should be 1 instead of 11)
   Invalid directory item count
   (It should be 8 instead of 12)
** Checking Extended Attributes file.
   Invalid sibling link
(8, 65)
** Volume check failed.
volume check failed with error 7
 volume type is pure HFS+
 primary MDB is at block 0 0x00
 alternate MDB is at block 0 0x00
 primary VHB is at block 2 0x02
 alternate VHB is at block 5859651494 0x15d432fa6
 sector size = 512 0x200
 VolumeObject flags = 0x07
 total sectors for volume = 5859651496 0x15d432fa8
 total sectors for embedded volume = 0 0x00

Don't know if it's caused by this reported bug or by the power button shutdown.

I repaired the disk with Mac OS disk utility and verified that fsck in Ubuntu finds it OK again. Then ran the "test" once again. The problem happened again so crash is not because of existing file system errors.