[Gluster-devel] Linux 5.2-RC regression bisected, mounting glusterfs volumes fails after commit: fuse: require /dev/fuse reads to have enough buffer capacity

[Sander Eikelenboom]

L.S.,

While testing a linux 5.2 kernel I noticed it fails to mount my glusterfs volumes.

It repeatedly fails with:
   [2019-06-11 09:15:27.106946] W [fuse-bridge.c:4993:fuse_thread_proc] 0-glusterfs-fuse: read from /dev/fuse returned -1 (Invalid argument)
   [2019-06-11 09:15:27.106955] W [fuse-bridge.c:4993:fuse_thread_proc] 0-glusterfs-fuse: read from /dev/fuse returned -1 (Invalid argument)
   [2019-06-11 09:15:27.106963] W [fuse-bridge.c:4993:fuse_thread_proc] 0-glusterfs-fuse: read from /dev/fuse returned -1 (Invalid argument)
   [2019-06-11 09:15:27.106971] W [fuse-bridge.c:4993:fuse_thread_proc] 0-glusterfs-fuse: read from /dev/fuse returned -1 (Invalid argument)
   etc. 
   etc.

Bisecting turned up as culprit:
    commit d4b13963f217dd947da5c0cabd1569e914d21699: fuse: require /dev/fuse reads to have enough buffer capacity

The glusterfs version i'm using is from Debian stable:
    ii  glusterfs-client                3.8.8-1                      amd64        clustered file-system (client package)
    ii  glusterfs-common                3.8.8-1                      amd64        GlusterFS common libraries and translator modules


A 5.1.* kernel works fine, as does a 5.2-rc4 kernel with said commit reverted.

--
Sander