Re: PR/53998 CVS commit: src/sys

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

Havard Eidnes a écrit :
> The following reply was made to PR kern/53998; it has been noted by GNATS.
> 
> From: Havard Eidnes <he%NetBSD.org@localhost>
> To: joel.bertrand%systella.fr@localhost
> Cc: christos%zoulas.com@localhost, gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,
>  gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
> Subject: Re: PR/53998 CVS commit: src/sys
> Date: Sun, 10 Mar 2019 13:09:10 +0100 (CET)
> 
>  > Free slot : 3 (468 threads)
>  > Free slot : 4 (469 threads)
>  > Free slot : 5 (470 threads)
>  > Free slot : 6 (471 threads)
>  > dead lock detected   <-------------- ?
>  
>  This message comes from ld.elf_so.  It may be spuriously seen
>  during a rust build (which aborts the build in that case).
>  
>  Joerg says about this:
>  
>    Multi-threaded programs forking in one thread while another
>    thread holds an exclusive lock would be required. It might be
>    necessary for the other thread to be the main thread, so that
>    _lwp_self() will be the same LWP ID, but that's just
>    speculation at this point.
>  
>  Don't know if that brings you closer to figuring out the root
>  cause.
>  
>  Regards,
>  
>  - H=E5vard
>  
> 

	I have added an exclusive lock (mutex) to protect fork(). I haven't
seen this message anymore but some threads or process still stall.

	Regards,

	JKB