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

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Message-ID: <876aefd0-808a-bb4b-0897-191f0a8d9e12@eikelenboom.it>
Date:   Tue, 11 Jun 2019 12:46:38 +0200
From:   Sander Eikelenboom <linux@...elenboom.it>
To:     Kirill Smelkov <kirr@...edi.com>,
        Miklos Szeredi <mszeredi@...hat.com>, gluster-devel@...ster.org
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org
Subject: Linux 5.2-RC regression bisected, mounting glusterfs volumes fails
 after commit: fuse: require /dev/fuse reads to have enough buffer capacity

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