Re: Filesystem hang on kernel 4.2.0 with copy reflink

2016-01-04 Thread Mark Zealey
the btrfs volume if that makes any difference. Mark On 04/01/16 12:41, Jack Wang wrote: Hi Mark, Could you do below when the hang happens, and post the dmesg. echo w > /proc/sysrq-trigger 2016-01-04 9:35 GMT+01:00 Mark Zealey : Hi there, I've run into a very strange hang with btrfs. I was

Filesystem hang on kernel 4.2.0 with copy reflink

2016-01-04 Thread Mark Zealey
Hi there, I've run into a very strange hang with btrfs. I was trying to restore a directory (postgres database) from a readonly snapshot. To do this i used the command `cp -ar --reflink=always`. This worked fine for 100s of files, however when it got to a particular file 16 kworker threads (I h