[Bug 201912] panic in smbfs during mount

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201912

Rick Macklem <rmacklem at FreeBSD.org> changed:

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                 CC|                            |rmacklem at FreeBSD.org

--- Comment #5 from Rick Macklem <rmacklem at FreeBSD.org> ---
Created attachment 162117
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162117&action=edit
fix a race between smb_iod_destroy() and the smd_iod thread that destroys
mutexes and frees the iod structure prematurely

I think this patch might fix the problem that caused
your crash. Your crash does look somewhat different than
PR#172942, but it does call smb_iod_destroy() via
smb_vc_gone() and that is where the race was.

Unfortunately your crash does suggest that the mount
was trying to do another smb_iod_destroy() when it
had already happened and this might suggest an additional
race that the patch doesn't address.

Since it is somewhat different, I haven't marked it as
a duplicate of PR#172942. I will do that if Martin
reports back that the patch seems to have stopped
the crashes from occurring. (I have no idea how reproducible
these crashes are?

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