PLEASE TEST: IPI deadlock avoidance patch

Doug White dwhite at
Thu Aug 26 10:37:59 PDT 2004

On Mon, 23 Aug 2004, Garance A Drosihn wrote:

> At 12:05 PM -0700 8/22/04, Doug White wrote:
> >Hey folks,  [...]   please try this patch:
> >
> >
> >
> >This patch avoids a deadlock between the smp_rendezvous()
> >mechanism and TLB shootdowns via pmap by forcing them to
> >share a mutex.
> I have completed a series of buildworlds with -j3 to -j10 with
> no problem.  I then started up a "folding at home" client, and
> repeated the buildworlds.  No panics, but in the second set I
> did have one buildworld (-j9) which failed with four processes
> apparently getting a "*** Signal 6".  I am not sure what that
> was about. Note that all these builds were done with a `make'
> that was compiled to USE_KQUEUE , so maybe that's where the
> Signal's came from.  In any case, the machine is still running
> fine, even after that heavy pounding.

Signal 6 is SIGABRT, which is usually intentional. You'd have to check the
output for a specific process that abended.  I'd also have to scan the
make code for any abort() calls.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at          |

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