[Bug 264094] VNET and DPCPU defined in modules panic on use on arm64 after LLVM 14 import due to new linker relaxation
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Date: Mon, 12 Dec 2022 17:32:22 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264094
Mark Johnston <markj@FreeBSD.org> changed:
What |Removed |Added
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CC| |markj@FreeBSD.org
--- Comment #19 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Jessica Clarke from comment #10)
Can you see offhand why the symbol (vnet_entry_htcp_adaptive_backoff) is
preemptible in the first place? For arm64 KLDs, VNET_DEFINE_STATIC is hacked
up to omit the static qualifier. But the linker changes the binding of the
symbol:
cc_htcp.o:
73: 0000000000000000 4 OBJECT GLOBAL DEFAULT 5
vnet_entry_htcp_adaptive_backoff
cc_htcp.ko:
35: 0000000000021520 4 OBJECT LOCAL DEFAULT 11
vnet_entry_htcp_adaptive_backoff
and local symbols have hidden visibility by default. I'm not sure offhand why
it's changed. I guess -Bsymbolic would have that effect, but we don't specify
it.
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