Date: Sun, 17 Sep 2017 03:01:15 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 222234] head -r323246 aarch64 (Pine64+ 2GB) boot time context, sometimes: acquiring blockable sleep lock with spinlock or critical section held Message-ID: <bug-222234-8-yS1kmHJ8RI@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-222234-8@https.bugs.freebsd.org/bugzilla/> References: <bug-222234-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222234 --- Comment #2 from Mark Millard <markmi@dsl-only.net> --- Created attachment 186443 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D186443&action= =3Dedit patch to allow non-debug kernel booting The patch contents derives from running into ARMv8-A material that said: ARM recommends that software includes a DSB instruction before any SEV instruction. This was because of a lack of ordering relative to completion of memory access instructions prior to the SEV instruction. This does not appear to be architecturally specific to the A64: the quote is not from material about the A64. But the observation is that A64 does not seem to guarantee more. I'm not aware of reports for other contexts. I'll note that debug kernel builds (with at least invariants) tends to sometimes fail but usually boot. By contrast I've not had a non-debug kernel boot yet. --=20 You are receiving this mail because: You are the assignee for the bug.=
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