Re: lib/58154: aarch64: firefox-124.0.2 crashes very frequently on NetBSD/aarch64 10.0, likely related to thread-local storage

[PHO <pho%cielonegro.org@localhost>]

The following reply was made to PR lib/58154; it has been noted by GNATS.

From: PHO <pho%cielonegro.org@localhost>
To: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, lib-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: lib/58154: aarch64: firefox-124.0.2 crashes very frequently on
 NetBSD/aarch64 10.0, likely related to thread-local storage
Date: Tue, 14 May 2024 23:23:17 +0900

 > Awesome, thanks!  Sorry I didn't get around to digging into this one.
 > We should get a reproducer committed into atf.  Have you drafted a
 > small reproducer that we could adapt?
 
 I tried hard, but no I couldn't. The buggy code conditionally branched 
 based on a value read from an uninitialized part of memory, and most of 
 the time the value it read was zero, which prevented the bug from rising 
 up to the surface. The reason why it hit Firefox so frequently was 
 apparently that Firefox allocated unusually many TLS blocks.
 
 If only we had MSAN...