[Bug 227213] FreeBSD 10.4 kernel deadlocks on sysctlmemlock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227213

--- Comment #34 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Eugene Grosbein from comment #32)
Oh, yes, I have.
I think that that stack trace indicates two issues.

1. That a sysctl handler to print dev.XXX.N.%pnpinfo performs an ACPI
evaluation.
That seems to be too heavy.  The code should probably use a cached value.

2. That the thread is stuck in AcpiOsAcquireMutex when trying to acquire
ACPI_MTX_INTERPRETER (the interpreter lock).
This could be either because some other thread is holding that lock (for
whatever reason) or because of a bug in AcpiOsAcquireMutex (or maybe a bug in
DSDT).
This needs further analysis.

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