https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246886
Bug ID: 246886
Summary: Nginx + FUSE causes VM stall
Product: Base System
Version: 12.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: nish...@asusa.net
I'm developing a distributed file system using FUSE on FreeBSD 12.1-RELEASE and
STABLE. However, when Nginx is accessing the FUSE mounted filesystem, Nginx
stalls with 'grbmaw' state.
grbmaw seems to be used by vm_page_busy_sleep() and it seems to never awake
again for some reason.
My FUSE program is just waiting for the next command at fuse_session_loop_mt().
I have tested with 4 different kinds of hardware and get this problem with 3 of
them. The biggest difference between those 3 and the remaining 1 is the NIC;
the 3 are wired and the rest is wireless.
I guess this happens when Nginx is rushed to access or send the data.
Once it happens, I need to reboot the device but it does not always shut down.
It is easily reproducible.
I think the problem is fuse.ko related and would appreciate it if anybody could
fix it.
Thank you.
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