bin/60469: assertion "ALIGNED_P(q, obj->tlsalign)" failed: file "/usr/src/libexec/ld.elf_so/tls.c", line 333

["campbell+netbsd%mumble.net@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60469
>Category:       bin
>Synopsis:       assertion "ALIGNED_P(q, obj->tlsalign)" failed: file "/usr/src/libexec/ld.elf_so/tls.c", line 333
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 20 13:30:00 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11
>Organization:
The NetTLS Misalignment, Inc.
>Environment:
>Description:

	With ld.elf_so built with DEBUG, thread-local storage alignment
	sometimes goes awry.

	Reported by ryoon@ on current-users:
	https://mail-index.NetBSD.org/current-users/2026/07/20/msg047745.html

>How-To-Repeat:

	$ dig txt _spf.google.com
	assertion "ALIGNED_P(q, obj->tlsalign)" failed: file "/home/riastradh/netbsd/current/src/libexec/ld.elf_so/tls.c", line 333
	[1]   Abort trap (core dumped) LD_DEBUG=1 dig txt _spf.google.com.
	$ LD_DEBUG=1 dig txt _spf.google.com
	...
	initializing Thread Local Storage for main thread
	_rtld_tls_static_space 2576
	lwp 3791 tls tcb 0x787463e63a90
	/usr/bin/dig: [lwp 3791] tls dtv 0x787463e63910-0x787463e63910 index 1 offset 180 alignment 80 tlsinit 0x847a80 BAD ALIGNMENT
	assertion "ALIGNED_P(q, obj->tlsalign)" failed: file "/home/riastradh/netbsd/current/src/libexec/ld.elf_so/tls.c", line 333
	[1]   Abort trap (core dumped) LD_DEBUG=1 dig txt _spf.google.com.

	(Note: `alignment 80' is in hexadecimal.)

>Fix:

	Yes, please!