Re: port-amd64/58344: Machine hangs at end of shutdown -r

["Hauke Fath via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-amd64/58344; it has been noted by GNATS.

From: Hauke Fath <hf%spg.tu-darmstadt.de@localhost>
To: gnats-bugs%netbsd.org@localhost, port-amd64-maintainer%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-amd64/58344: Machine hangs at end of shutdown -r
Date: Wed, 29 Oct 2025 18:19:06 +0100

 On 17.06.2024 15:50, Taylor R Campbell wrote:
 >   > Since I can reproduce the issue at will: Is there any debug option that
 >   > would give more information about the last seconds before reboot?
 >   
 >   Some things you could try:
 >   
 >   1. set cpureset_delay to 0 (e.g., enter ddb and `w cpureset_delay 0')
 >      before attempting reboot, and see if that makes a difference --
 >      maybe delay() is broken at that point somehow
 
 Looking into this rather belatedly (and because machine downtime is 
 convenient), I found there is a CPURESET_DELAY kernel option which, when 
 set to 0, will let the kernel reboot the machine reliably.
 
 Since the machine is on serial console, I don't care about this delay, 
 so for me the problem is resolved.
 
 Now why i8254_delay() would hang at this point is anybody's guess. There 
 may well be a board specific problem, and since the hardware is 
 approaching EOL, I am fine with moving the issue to the archives.
 
 Cheerio,
 Hauke
 
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