PR/51254 CVS commit: src/sys/uvm

[gnats-admin%netbsd.org@localhost]

The following reply was made to PR kern/51254; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/51254 CVS commit: src/sys/uvm
Date: Thu, 15 Aug 2024 11:33:21 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Thu Aug 15 11:33:21 UTC 2024
 
 Modified Files:
 	src/sys/uvm: uvm_map.c
 
 Log Message:
 uvm_map(9): Apply the same orig_hint clamp again to the same entry.
 
 Previous change dealt with case like length=0x1000 and:
 
 [0x7defb000,0x7defc000)		entry above orig_hint (entry->next)
 0x77895000			orig_hint
 [0x77894000,0x77895000)		entry below orig_hint (entry)
 
 by changing
 
 	entry->next->start - length
 
 to
 
 	MIN(orig_hint, entry->next->start - length)
 
 in order to enforce monotonicity of search.
 
 In this case, if the tree search for a gap has failed, we retry with
 a list search with exactly the same orig_hint and entry -- nothing
 has changed them (only hint and tmp).  So apply the same clamping.
 
 PR kern/51254: uvm assertion "!topdown || hint <= orig_hint" failed
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.424 -r1.425 src/sys/uvm/uvm_map.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.