Re: port-evbmips/60812 (UBSan: Undefined Behavior in [sys-src] member access within misaligned address [..] for type '[..]' which requires 128 byte alignment)

["Alexander Schreiber via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-evbmips/60812; it has been noted by GNATS.

From: Alexander Schreiber <als%thangorodrim.ch@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-evbmips-maintainer%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, riastradh%netbsd.org@localhost
Subject: Re: port-evbmips/60812 (UBSan: Undefined Behavior in [sys-src]
 member access within misaligned address  [..] for type '[..]' which requires
 128 byte alignment)
Date: Thu, 1 Oct 2026 21:48:06 +0200

 Update:
  - I've built and booted another debug kernel from HEAD/20260930062955Z
  - booted on the EdgeRouter4 (essentially same hardware as Erlite3,
    but the "big brother": 4x 1 GHz mips64, 1 G RAM)
  - we're down to two UBSan complaints about integer shifts:
 
 --------------- cut here -------------------
 [   1.0000000] cpu0: 256 TLB entries, 512TB (49-bit) VAsUBSan: Undefined Behavior in /usr/build/HEAD_20260930062955Z/usr/src/sys/arch/mips/mips/mips_machdep.c:1640:37, left shift of 9223372036787666944 by 1 places cannot be represented in type 'long int'
 [   1.0000000] UBSan: Undefined Behavior in /usr/build/HEAD_20260930062955Z/usr/src/sys/lib/libkern/../../../common/lib/libc/string/memset2.c:104:15, left shift of 4294967295 by 32 places cannot be represented in type 'long int'
 --------------- cut here -------------------
 
 Kind regards,
            Alex.
 -- 
 "Opportunity is missed by most people because it is dressed in overalls and
  looks like work."                                      -- Thomas A. Edison