Re: kern/53928: modules/t_builtin:disable test case randomly fails

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

The following reply was made to PR kern/53928; it has been noted by GNATS.

From: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%NetBSD.org@localhost>
Cc: 
Subject: Re: kern/53928: modules/t_builtin:disable test case randomly fails
Date: Wed, 30 Jan 2019 14:43:48 +0100

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 > On 30. Jan 2019, at 13:20, Paul Goyette <paul%whooppee.com@localhost> wrote:
 <snip>
 > So, the problem here would appear to be vfs_detach() returning EBUSY
 > when trying to unload the module.
 
 This is most likely fstrans.  Destroying a "struct mount" and
 thus releasing its mnt_op vector is done by the last thread
 running fstrans_enter() and seeing a mount with IMNT_GONE.
 
 It may help to "sysctl -w kern.maxvnodes=2", which fails
 but may trigger threads holding a reference to the mount.
 
 --
 J. Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig
 
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