Re: port-arm/57102: vcmbox0 thread using 100% CPU

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR port-arm/57102; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: cryintothebluesky%gmail.com@localhost
Cc: gnats-bugs%netbsd.org@localhost, port-arm-maintainer%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: port-arm/57102: vcmbox0 thread using 100% CPU
Date: Sat, 10 Dec 2022 18:58:37 +0000

 > Date: Sat, 10 Dec 2022 16:05:00 +0000 (UTC)
 > From: cryintothebluesky%gmail.com@localhost
 > 
 > The issue occurred on Raspberry Pi 4, used as NFS server. Initiated
 > a large copy from Linux NFS client to NetBSD NFS server. Some time
 > later, vcmbox0 thread was consuming 100% CPU and the following
 > message was logged before I rebooted the system
 
 If you catch this again, it would be helpful if you could start
 crash(8), run
 
 crash> ps
 
 to find the thread occupying the CPU, which will look something like
 this:
 
 10618>10618 7   1         0   ffffa06b1676e940                 sh
 
 Note the `>' on the line marking it as a running thread, and the
 thread name is not `idle/N'.  Most likely the thread name will be
 vcmbox0 or something.  Copy & paste the horrible number like
 ffffa06b1676e940 into bt/a:
 
 crash> bt/a ffffa06b1676e940
 
 Sharing the stack trace should help track down what it's up to.
 
 The full output of ps and ps/w might also be helpful, so it wouldn't
 hurt to include those too.