Date: Wed, 2 Jun 2004 08:13:08 -0700 From: Bosko Milekic <bmilekic@FreeBSD.org> To: Divacky Roman <xdivac02@stud.fit.vutbr.cz> Cc: current@freebsd.org Subject: Re: uipc_socket2.c panic Message-ID: <20040602151308.GA43008@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>P.S. I have a bad feeling that this happend even BEFORE mbuma... (a day
>or two before you commited that).
Why do you have this feeling? Was it occuring before?
I've had one report of a similar-nature problem which I believe
I fixed in rev 1.2 of kern_mbuf.c. But this might be different.
Try backing out the mbuma changes (i.e., going to -CURRENT the day
before mbuma) to confirm whether this still occurs.
If so, I'd also recommend trying to disable pre-emption, just so
we can rule that out as a possibility. To disable pre-emption:
- edit src/sys/kern/kern_intr.c
- go down to ithread_schedule()
- spot this code (around line 412):
if (do_switch &&
(ctd->td_critnest == 1) ) {
KASSERT((TD_IS_RUNNING(ctd)),
("ithread_schedule: Bad state for curthread."));
if (ctd->td_flags & TDF_IDLETD)
ctd->td_state = TDS_CAN_RUN; /* XXXKSE */
mi_switch(SW_INVOL);
} else {
curthread->td_flags |= TDF_NEEDRESCHED;
}
- Change above code to this:
#if 0
if (do_switch &&
(ctd->td_critnest == 1) ) {
KASSERT((TD_IS_RUNNING(ctd)),
("ithread_schedule: Bad state for curthread."));
if (ctd->td_flags & TDF_IDLETD)
ctd->td_state = TDS_CAN_RUN; /* XXXKSE */
mi_switch(SW_INVOL);
} else {
#endif
curthread->td_flags |= TDF_NEEDRESCHED;
/* } */
(leaving only the curthread->td_flags |= TDF_NEEDRESCHED line
uncommented).
- rebuild and install new kernel.
I'd recommend trying to backout to JUST before mbuma before trying
the pre-emption disable. Let me know how it goes.
-Bosko
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040602151308.GA43008>