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Date:      Fri, 06 Sep 2019 12:54:00 +0000
From:      bugzilla-noreply@freebsd.org
To:        testing@freebsd.org
Subject:   [Bug 211924] lib/libc/sys/mmap_test:mmap_truncate_signal fails with SIGSEGV instead of SIGBUS
Message-ID:  <bug-211924-32464-IbLRJmPeda@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-211924-32464@https.bugs.freebsd.org/bugzilla/>
References:  <bug-211924-32464@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211924

--- Comment #6 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Jilles Tjoelker from comment #5)
I believe we are compliant with the behavior for the partial page.  We alwa=
ys
zero-fill invalid parts of the partially-valid pages that are mapped into
userspace.

Was there a history behind the SIGBUS requirement ?  I believe that the cha=
nge
for SIGBUS->SIGSEGV came with r151316, and I cannot remember such explicit
language at that time.

Anyway, I am certain that we do not want to change the signal definitions b=
ack,
because there are programs that depend on it and which already did the swit=
ch
to accommodate to the change.

--=20
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