[Bug 203035] fusefs module severely breaking system-wide I/O

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203035

            Bug ID: 203035
           Summary: fusefs module severely breaking system-wide I/O
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: neffi at neffi.net

Running 10.2-RELEASE-p2. 

The mere presence of the fusefs kernel module is completely obliterating I/O on
my machine. Shortly after loading the fusefs module, or whenever I load it at
boot with 'fuse_load="YES"' in /boot/loader.conf, all I/O essentially wedges.
All I/O requests will hang for very long periods of time, or totally deadlock.
Various programs are reporting I/O timeouts left and right. Actually, the
entire computer is basically unusable. Xorg/Xfce will hang on start because of
deadlocked I/O and even a basic 'ls' in the console will hang. 

I only just installed FreeBSD recently, so I cannot say when the issue
originated, but I had 10.1 installed previously and did not experience this
issue. I have been through three FreeBSD installs and multiple tests on my hard
drive and RAM trying to diagnose this issue, until I finally decided to try
disabling fusefs on a fluke, and it fixed the issue. Re-enabling the module at
boot time consistently produces an unusable system.

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