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Subject: [Bug sanitizer/101476] AddressSanitizer check failed, points out a
 (potentially) non-existing stack error and pthread_cancel
Date: Tue, 25 Jan 2022 11:25:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101476

--- Comment #14 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Stas Sergeev from comment #13)
> Found another problem.
> https://github.com/gcc-mirror/gcc/blob/master/libsanitizer/asan/asan_posi=
x.
> cpp#L53
> The comment above that line talks about
> SS_AUTODISARM, but the line itself does
> not account for any flags. In a mean time,
> linux returns SS_DISABLE in combination
> with flags, like SS_AUTODISARM. So the
> "!=3D" check should not be used.
>=20
> My app probes for SS_AUTODISARM by trying
> to set it, and after that, asan breaks.
> This is quite cludgy though.
> Should the check be changed to
> if (!(signal_stack.ss_flags & SS_DISABLE))
> or maybe linux should not return any flags
> together with SS_DISABLE?
> man page talks "strange things" on that subject.

Please report to upstream as well.=