Re: port-amd64/60920: 11.0 kernel for amd64 fails with null pointer deref in uvm_page_redim()

["Michael van Elst via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-amd64/60920; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-amd64/60920: 11.0 kernel for amd64 fails with null pointer deref in uvm_page_redim()
Date: Sat, 24 Oct 2026 23:49:13 -0000 (UTC)

 he%NetBSD.org@localhost (Havard Eidnes) writes:
 
 >So those show numa_id 0, 1, 2 and 3 (in reverse order)?
 
 >But why doesn't 10.0 fail, but 11.0 does?
 
 Maybe -11 clears the array and the stack value is a
 "valid" pointer (to something else, but that doesn't
 cause a crash) ?
 
 In any case, with 4 NUMA nodes, you need at least 4 buckets
 and not 2. Or you also have to reduce the numa-id modulo bucket count.
 
 As a crude workaround you might be able to disable NUMA
 in the BIOS.