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Re: PR/53998 CVS commit: src/sys/kern

The following reply was made to PR kern/53998; it has been noted by GNATS.

From: (Christos Zoulas)
Subject: Re: PR/53998 CVS commit: src/sys/kern
Date: Mon, 25 Feb 2019 09:22:40 -0500

 On Feb 25,  2:05pm, (=?UTF-8?Q?BERTRAND_Jo=c3=abl?=) wrote:
 -- Subject: Re: PR/53998 CVS commit: src/sys/kern
 |  	Christos,
 |  	I have applied bith patch (you will find in attachment patch against -8).
 |  	This patch partially fixes this PR as my test program can create more
 |  threads before first sem_init() failure. But I think there is another
 |  race condition somewhere in semaphore subsystem.
 |  	After sem_init() failure, there is no specific message in dmesg or logfile.
 |  	I don't understand why atomic_dec_uint(&nsems_total) or
 |  atomic_inc_uint(&nsems_total) are not protected by a lock.
 Yes, the whole thing is racy... But atomics don't need to be protected
 by locks... How does it fail now ENFILE?

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