[Bug 202419] Opening files hangs calling openat() while CWD is on a smbfs mount

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202419

            Bug ID: 202419
           Summary: Opening files hangs calling openat() while CWD is on a
                    smbfs mount
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: martin at sugioarto.com

Scenario:

- server serves files with Samba 3.6
- client mounts with smbfs

Problem description:

- change directory to the smbfs-mounted filesystem on client
- try to start vim (not vi!), evince, libreoffice or similar (you don't need to
open a file from smbfs!)
- truss shows that it hangs calling openat in infinite loop

truss output:

openat(0xffffff9c,0x7fffffffc6b0,0x100000,0x0,0x7ff7fe43c39f,0x8080808080808080)
= 499 (0x1f3)
openat(0xffffff9c,0x7fffffffc6b0,0x100000,0x0,0x7ff7fe43c39f,0x8080808080808080)
= 499 (0x1f3)
openat(0xffffff9c,0x7fffffffc6b0,0x100000,0x0,0x7ff7fe43c39f,0x8080808080808080)
= 499 (0x1f3)
[ repeating infinitely ]

Further details:

- while current working directory is inside a smbfs-mountpoint, it is also not
possible to open files on locally mounted filesystems

Mount description in /etc/fstab:

//username at servername/remotefs   /net/server/remotefs  smbfs  
rw,noauto,-N,-W=DOMAIN,-u=username,-g=groupname    0       0

(*) remark: I use noauto because there is a race condition with the network
initialization which forces me to mount after a 10s sleep in /etc/rc.local (I
think this problem is not related with the one described here)


Disclaimer:

It might be a samba misconfiguration. I am not fully sure what happens here.

--
Martin

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