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kern/55946: kern_event.c changes break firefox

>Number:         55946
>Category:       kern
>Synopsis:       recent kern_event.c changes break firefox
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 22 20:10:00 +0000 2021
>Originator:     Paul Goyette
>Release:        NetBSD 9.99.78
| Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
| (Retired)          | FA29 0E3B 35AF E8AE 6651 |     |
| Software Developer | 0786 F758 55DE 53BA 7731 |   |
System: NetBSD 9.99.78 NetBSD 9.99.78 (SPEEDY 2021-01-22 04:02:20 UTC) #1: Fri Jan 22 19:50:36 UTC 2021 amd64
Architecture: x86_64
Machine: amd64
	With recent changes to kern_event.c (beginning with rev 1.111)
	firefox seems to be badly broken.  Attempting to open certain
	pages results in never-ending-hang (I actually waited more than
	an hour!), and nothing ever gets rendered.  I can use the
	Stop-Reloading "X" button, and the "oscillating dot" load
	indicator stops oscillating, but nothing ever happens.  At that
	point, the tab is hung and cannot load any other page, not even
	pages that loaded successfully previously!  I _can_ delete the
	tab, and opening a new tab works.

	I've reverted kern_event.c to rev 1.110 and rebuilt my kernel
	from the same source tree.  With rev 1.110 everything works as

	See above
	Revert kern_event.c (the original problem fixed by 1.111 thru
	1.113 needs to be fixed differently).


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