On 30 Sep, Don Lewis wrote: > The silent reboots that I was seeing with WITNESS go away if I add > WITNESS_SKIPSPIN. Witness doesn't complain about anything.
I've tracked down the the silent reboot problem. It happens when a userland sysctl call gets down into calcru1(), which tries to print a "calcu: .." message. Eventually sc_puts() wants to grab a spin lock, which causes a call to witness, which detects a lock order reversal. This recurses into printf(), which dives back into the console code and eventually triggers a panic. I'm still gathering the details on this and I see what I can come up with for a fix. > I tested -CURRENT and !SMP seems to work ok. One difference in terms of > hardware between the two tests is that I'm using a SATA drive when > testing -STABLE and a SCSI drive when testing -CURRENT. I'm not able to trigger the problem with -CURRENT when it is running on a SCSI drive, but I do see the freezes, long ping RTTs, and ntp insanity when running a !SMP -CURRENT kernel on my SATA drive with an 8.1-STABLE world. _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
