kern/60376: uvm_km: missing pmap_update on free

["kevin.bowling%kev009.com@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60376
>Category:       kern
>Synopsis:       uvm_km: missing pmap_update on free
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 27 22:20:00 +0000 2026
>Originator:     Kevin Bowling
>Release:        trunk
>Organization:
NetBSD
>Environment:
NetBSD kev-ws-t480.cv0.bbox.io 11.99.6 NetBSD 11.99.6 (GENERIC) #0: Sun Jun 21 10:28:09 UTC 2026  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
uvm_km_pgremove needs similar treatment for pmap_update on free.
>How-To-Repeat:
N/A
>Fix:
One was already committed and pulled back to 9, 10, 11:

Module Name:    src
Committed By:   kbowling
Date:           Sat Jun 27 09:39:57 UTC 2026

Modified Files:
        src/sys/uvm: uvm_km.c

Log Message:
uvm_km_pgremove_intrsafe: drain TLB shootdown before freeing pages

Call pmap_update(pmap_kernel()) between pmap_kremove and the page
free so the shootdown completes first.

Reviewed by skrll@


To generate a diff of this commit:
cvs rdiff -u -r1.166 -r1.167 src/sys/uvm/uvm_km.c