Re: kern/55421: kernel stalls on pager_map, not allowing any userland processes to run

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

The following reply was made to PR kern/55421; it has been noted by GNATS.

From: Rin Okuyama <rokuyama.rk%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: Martin Husemann <martin%NetBSD.org@localhost>
Subject: Re: kern/55421: kernel stalls on pager_map, not allowing any userland
 processes to run
Date: Fri, 26 Jun 2020 17:22:39 +0900

 I observed a similar problems on macppc. It occurred often for me.
 As a workaround, I turned off __HAVE_FAST_SOFTINTS:
 
 ----
 Index: src/sys/arch/powerpc/include/intr.h
 ===================================================================
 RCS file: /home/netbsd/src/sys/arch/powerpc/include/intr.h,v
 retrieving revision 1.17
 diff -p -u -r1.17 intr.h
 --- src/sys/arch/powerpc/include/intr.h	16 Apr 2020 23:29:52 -0000	1.17
 +++ src/sys/arch/powerpc/include/intr.h	26 Jun 2020 08:14:56 -0000
 @@ -34,7 +34,10 @@ __KERNEL_RCSID(0, "$NetBSD: intr.h,v 1.1
   #ifndef _POWERPC_INTR_MACHDEP_H_
   #define _POWERPC_INTR_MACHDEP_H_
   
 +#if 0
 +/* XXX kern/55421, port-vax/55415 */
   #define	__HAVE_FAST_SOFTINTS	1
 +#endif
   
   
   /* Interrupt priority `levels'. */
 ----
 
 Since then I've never observed similar stalls. I wonder whether
 this is related to port-vax/55415 or not:
 
 http://gnats.netbsd.org/55415
 
 (vax is also port with __HAVE_FAST_SOFTINTS enabled). But, I've
 never still examined a problem in details yet...
 
 Thanks,
 rin