Hi, On Wed, Feb 29, 2012 at 2:22 PM, Attilio Rao <atti...@freebsd.org> wrote: > 2012/2/29, Arnaud Lacombe <lacom...@gmail.com>: >> Hi, >> >> On Wed, Feb 29, 2012 at 1:44 PM, Attilio Rao <atti...@freebsd.org> wrote: >>> 2012/2/29, Arnaud Lacombe <lacom...@gmail.com>: >>>> Hi, >>>> >>>> On Wed, Feb 29, 2012 at 12:59 PM, Arnaud Lacombe <lacom...@gmail.com> >>>> wrote: >>>>> Hi, >>>>> >>>>> On Mon, Feb 27, 2012 at 12:48 PM, Arnaud Lacombe <lacom...@gmail.com> >>>>> wrote: >>>>>> Hi, >>>>>> >>>>>> On Mon, Feb 27, 2012 at 10:36 AM, Attilio Rao <atti...@freebsd.org> >>>>>> wrote: >>>>>>> 2012/2/27, Arnaud Lacombe <lacom...@gmail.com>: >>>>>>>> Hi, >>>>>>>> >>>>>>>> On Tue, Feb 14, 2012 at 11:41 AM, Arnaud Lacombe <lacom...@gmail.com> >>>>>>>> wrote: >>>>>>>>> Hi folks, >>>>>>>>> >>>>>>>>> For the records, I was running some tests yesterday on top of a >>>>>>>>> 9.0-RELEASE, amd64, kernel when the box hanged. At the time of the >>>>>>>>> hang, the box was running a process with about 2800 threads with >>>>>>>>> heavy >>>>>>>>> IPC between 1400 writers and 1400 readers. The box was in single >>>>>>>>> user >>>>>>>>> mode (/bin/sh coming from FreeBSD 7.4-STABLE). Here is the beginning >>>>>>>>> of the dmesg: >>>>>>>>> >>>>>>>> This happened a second time, now with FreeBSD 8.2-RELEASE. Complete >>>>>>>> machine hang. The machine was running about 4000 threads in a single >>>>>>>> process, all the other condition are the same. >>>>>>> >>>>>>> Arnaud, >>>>>>> can you please break in your kernel via KDB, collect the following >>>>>>> informations from the DDB prompt: >>>>>>> - ps >>>>>>> - alltrace >>>>>>> - show allpcpu >>>>>>> - possibly get a coredump with 'call doadump' >>>>>>> >>>>>> Will do, but I'll need to rebuild a kernel to include DDB. >>>>>> >>>>>>> and in the end provide all those along with kernel binary and possibly >>>>>>> sources somewhere? >>>>>>> >>>>>> I'll be testing a bare `release/8.2.0' with the following patch: >>>>>> >>>>>> diff --git a/sys/amd64/conf/GENERIC b/sys/amd64/conf/GENERIC >>>>>> index c3e0095..7bd997f 100644 >>>>>> --- a/sys/amd64/conf/GENERIC >>>>>> +++ b/sys/amd64/conf/GENERIC >>>>>> @@ -79,6 +79,10 @@ options INCLUDE_CONFIG_FILE # Include this >>>>>> file in kernel >>>>>> >>>>>> options KDB # Kernel debugger related code >>>>>> options KDB_TRACE # Print a stack trace for a panic >>>>>> +options DDB >>>>>> +options BREAK_TO_DEBUGGER >>>>>> +options ALT_BREAK_TO_DEBUGGER >>>>>> >>>>>> # Make an SMP-capable kernel by default >>>>>> options SMP # Symmetric MultiProcessor Kernel >>>>>> >>>>> ok, it happened again after 2 days, the process was running about 3200 >>>>> threads. I'm trying to break into DDB and let you know, I'm not that >>>>> successful for now... >>>>> >>>> No luck. None of BREAK or ALT_BREAK are responding. I will not touch >>>> the system in the next few hours if you want me to test something on >>>> it. In the event of 8.2-RELEASE or 9.0-RELEASE are not meant to work >>>> reliably on top of a 7.4-RELEASE userland, I will re-setup the test to >>>> occurs on a clean 9.0-RELEASE system and re-try. >>> >>> We allow to break KBI when new releases happens, thus this may cause a >>> breakage for you, even if a deadlock is really not something you want. >>> >>> Can you try enabling SW_WATCHDOG, DEADLKRES and possibly arm your ichwd? >>> if the breakage involves clocks or interrupt sources there are still >>> chances they will be able to catch it though. >>> >>> However, it doesn't seem you are setup with a proper serial console? >> The serial console is working definitively fine. I can break into DDB >> at will when the test is running. I did not test with ALT_BREAK >> per-se, but BREAK does work. > > So if you try to break in DDB via serial break it doesn't work? > That is definitively very bad... > just to be sure, I rebooted the system and I could break into DDB at the first attempt with ALT_BREAK, BREAK was a bit more reluctant but worked too. So yes, this does not taste good :/
> Can you try with the options I mentioned earlier and see if something changes? > will do, but I will first attempt to reproduce this on 9.0-RELEASE. - Arnaud > Attilio > > > -- > Peace can only be achieved by understanding - A. Einstein _______________________________________________ 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"
