Bug 214976

Summary: SMBFS-mount hangs indefinitely when opening many files at once
Product: Base System Reporter: Alexander Klein <xelalex_maker>
Component: kernAssignee: freebsd-fs (Nobody) <fs>
Status: New ---    
Severity: Affects Some People    
Priority: ---    
Version: 10.3-RELEASE   
Hardware: i386   
OS: Any   

Description Alexander Klein 2016-12-01 11:10:07 UTC
On my system, issuing

for file in *.JPG; do nice -19 display -resize 25% $file &; done

in a directory on an SMBFS-mount with some 80 files produces a number of processes which only run for a fraction of a second and then all get stuck:

% ps
 PID TT  STAT    TIME COMMAND
2069  1  DNL  0:00,27 display -resize 25% 1.JPG
2070  1  DNL  0:00,26 display -resize 25% 2.JPG
2071  1  DNL  0:00,27 display -resize 25% 3.JPG
[…]

The processes cannot be killed, and all further file operations on the same mount, even umount -f, will get stuck, too.

Even worse, this problem even manages to make clean rebooting impossible, and I have to use reboot -q instead.

It might date back as far as 2005, see:

https://lists.freebsd.org/pipermail/freebsd-questions/2005-October/101035.html