Swap deadlock in 0.7.9 #7734
Description
System information
| Type | Version/Name |
|---|---|
| Distribution Name | Debian |
| Distribution Version | stretch |
| Linux Kernel | 4.16.0-0.bpo.2-amd64 |
| Architecture | amd64 |
| ZFS Version | 0.7.9-3~bpo9+1 |
| SPL Version | 0.7.9-3~bpo9+1 |
Describe the problem you're observing
System deadlocked while forcing a page out to a swap zvol. Unfortunately I do not have the rest of the backtraces.
Describe how to reproduce the problem
rsync a filesystem with O(1M) files.
Include any warning/errors/backtraces from the system logs
NAME PROPERTY VALUE SOURCE
rpool/swap type volume -
rpool/swap creation Tue Jun 26 17:52 2018 -
rpool/swap used 8.50G -
rpool/swap available 8.84T -
rpool/swap referenced 128K -
rpool/swap compressratio 1.09x -
rpool/swap reservation none default
rpool/swap volsize 8G local
rpool/swap volblocksize 4K -
rpool/swap checksum on default
rpool/swap compression zle local
rpool/swap readonly off default
rpool/swap createtxg 156102 -
rpool/swap copies 1 default
rpool/swap refreservation 8.50G local
rpool/swap guid 11434631848701244988 -
rpool/swap primarycache metadata local
rpool/swap secondarycache all default
rpool/swap usedbysnapshots 0B -
rpool/swap usedbydataset 128K -
rpool/swap usedbychildren 0B -
rpool/swap usedbyrefreservation 8.50G -
rpool/swap logbias throughput local
rpool/swap dedup off default
rpool/swap mlslabel none default
rpool/swap sync always local
rpool/swap refcompressratio 1.09x -
rpool/swap written 128K -
rpool/swap logicalused 46K -
rpool/swap logicalreferenced 46K -
rpool/swap volmode default default
rpool/swap snapshot_limit none default
rpool/swap snapshot_count none default
rpool/swap snapdev hidden default
rpool/swap context none default
rpool/swap fscontext none default
rpool/swap defcontext none default
rpool/swap rootcontext none default
rpool/swap redundant_metadata all default
rpool/swap com.sun:auto-snapshot false local