On 04/24/18 13:24, Jonathan T. Looney wrote:
On Mon, Apr 23, 2018 at 6:04 PM, John Baldwin <j...@freebsd.org
<mailto:j...@freebsd.org>> wrote:
>
> I think this is actually a key question. In my experience to date I
have not
> encountered a large number of post-panic assertion failures. Given that
> we already break all locks and disable assertions for locks I'd be
curious
> which assertions are actually failing. My inclination given my
experiences
> to date would be to explicitly ignore those as we do for locking if it is
> constrained set rather than blacklisting all of them. However, I
would be
> most interested in seeing some examples of assertions that are failing.
The latest example (the one that prompted me to finally commit this) is
in lockmgr_sunlock_try(): 'panic: Assertion (*xp &
~LK_EXCLUSIVE_SPINNERS) == LK_SHARERS_LOCK(1) failed at
/usr/src/sys/kern/kern_lock.c:541'
I don't see any obvious recent changes that would have caused this, so
this is probably a case where a change to another file suddenly made us
trip over this assert.
FWIW, that assertion has prevented me from getting a dump from an
INVARIANTS kernel for at least a year.
Drew
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