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Date:      Sat, 19 Jun 2021 22:50:03 +0000
From:      John F Carr <jfc@mit.edu>
To:        freebsd-arm <freebsd-arm@freebsd.org>
Subject:   Panic loading linsysfs with INVARIANTS configured
Message-ID:  <1C393737-2A10-4F19-8AC9-D75CF6F0A454@exchange.mit.edu>

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On a server class ARM (Ampere) running an up to date stable/13 kernel with =
INVARIANTS I get a panic in VFS code if I kldload linsysfs:

pfs_add_node: homonymous siblings

Anybody else see this recently?

On a Raspberry Pi 3B with INVARIANTS the kldload works.

There is a comment before the panic code
 	/* XXX no locking! */
which makes me wonder if 32 cores is too many for this code.

(Related to this: Does anybody get crash dumps on an Ampere system?  If I c=
onfigure DDB and use the debugger crash dump command it hangs after the 1% =
progress line.  Without the debugger the system just hangs without printing=
 any progress, but at least I can see the panic message before I power cycl=
e it.)=



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