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A newly spawned guest thread could receive SIGALRM, SIGINT, or interrupt signal before its GS base was initialized. The signal handler could then access invalid or inherited TLS state.
Initializing GS while guest signals remain blocked closes this race.
When this is cherry-picked into ulitebox, we may need to do some extra work to make sure the platform handles different shims properly.
ulitebox already has the fix for aarch64, I don't need to cherry-pick this one. Instead, I made some adjustment to backport some changes from ulitebox to main so that two branches look more similar. For ulitebox, some adaptation is needed and was made in #1567 when cherry-picking a previous PR that added fp support for x86_64.
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A newly spawned guest thread could receive
SIGALRM,SIGINT, or interrupt signal before its GS base was initialized. The signal handler could then access invalid or inherited TLS state.Initializing GS while guest signals remain blocked closes this race.