Re: [fuse-devel] read hangs unless in debug mode

[Kevin D. <the...@gm...>]

> 
> Hello,
> 
> I've written a fuse app that accesses data stored on our vendor's hardware
through their proprietary API. 
> The filesystem works well when in debug mode (passing -d to the fuse app). 
But when not in debug mode, and
> when reading a file in the fuse-mounted directory (e.g. more filename), it
hangs forever.  strace shows it
> stopping on the read function, specifically it lists 'read(3, '; there is
nothing printed for the buffer. 
> It's been some time since I wrote the fuse app, but I seem to remember a
problem like this if I had printf's in
> the code.  If not in debug mode, there's no place for the output to go, so it
would hang (?).  When I put it in
> debug mode however, I do not see any output other than normal debug output.  I
installed the latest version
> of fuse (2.6.1), but that did not help.  Any ideas?
> 
> Tim

This caught my attention as I am having an almost identica problem.  However, I
have further information to present.

Fuse Version: 2.6.1
Kernel Version: 2.6.18.2 (vanilla) with fuse compiled in

I used the three fuse programs to test and repeat this problem:
1) sshfs
2) the example program: hello.c
3) the example program: fusexmp.c

Without debug mode '-d' passed:
- mount some directory /tmp/test
- ls /tmp/test
- "cannot access /tmp/test: Transport endpoint is not connected"
- instead of above, it sometimes hangs indefinitely as with Tim
- mount some directory /tmp/test with '-d'
- ls /tmp/test
- shows contents of the mount correctly

I am wondering if it the kernel fuse library might be broken, i am compiling
2.6.18.6 and will be testing 2.6.17, in which I have used in the past on this
system with no problems.  But that was fuse-2.6.0.