> The fact that our NMI handler isn't re-entrant can lead to subtle > problems. If while executing the NMI handler we hit a dtrace > probe or DDB breakpoint, the iret executed upon return to the handler > will re-enable NMIs. Then, if a second NMI arrives before the handler > for the first has returned, the trapframe will be clobbered. Did you > rule out an issue like this?
No, but it happened instantly on all CPUs an a non-debug kernel 100% of the time after I changed pmc_process_interrupt earlier this week. My voodoo fix now avoids it. What you're describing sounds episodic and doesn't sound like it would be fixed / worked around by my change. -M _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
