On Thu, 31 Mar 2005, John Baldwin wrote: > On Thursday 31 March 2005 03:38 pm, William Michael Grim wrote: > > Hello. > > > > I keep having kernel panics every couple weeks on my system. It occurs in > > the sched_switch() function. There are several other statements in the > > backtrace involving "??"; what are those? > > > > I have attached the dump output and system info to this email. Any > > feedback would be helpful. > > > > Thanks so much for your help. > > The real trace ends with Xint0x80_syscall(). The rest after that is > garbage memory. Your real problem is in exit1() or ttywakeup(). Since > ttywakeup() doesn't call exit1() (AFAIK), the exit1() frame is probably > bogus (gdb doesn't grok trapframes maybe?) and the real bug is a NULL > pointer deref in ttywakeup(). Perhaps it's a bug in the ptc driver? > (ptcopen is in the trace). What is the ptc driver anyway?
I think we have a race in -STABLE relating to tty wakeups and open/close/device teardown. I've seen a panic relating to sio during a tty close on RELENG_5 about 5-6 months ago, but was unable to get a dump. Scott has since fixed dumps with twe, but I've not yet been able to get the bug to recur. I'll give it another try. Robert N M Watson _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
