On Wed, Sep 18, 2013 at 12:14:04AM +0400, Vagner wrote: > Hi! > I ran skype and perhaps, it was *destroyed* (may be it was fault of skype > , I don't know). After I have got system panic. I looked to coredump: > - I got fault in frame #7 where: if ((q->p_flag & P_WEXIT) == 0 && > em->pdeath_signal != 0). But struct linux_emuldata *em == NULL. > > # from kgdb: > # p em > # $1 = (struct linux_emuldata *) 0x0 > > - I saw what `em = em_find(q, EMUL_DOLOCK);' from upper line of code > and from function em_find() that `em' could be equal NULL. > > Perhaps, are we need to add check after line call em_find in function > linux_proc_exit() - `continue;`? >
In general this is a race condition and linux_proc_exit is not the only place where this is a problem. see http://people.freebsd.org/~mjg/patches/linux-emuldata-race-hack.diff Maybe I'll get around to commit this during the weekend, I am happy to let someone else work on this though. -- Mateusz Guzik <mjguzik gmail.com> _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
