Date: Wed, 29 Feb 2012 13:32:56 -0500 From: Arnaud Lacombe <lacombar@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Complete hang on 9.0-RELEASE Message-ID: <CACqU3MVko6jKjs98JeS1NqBp%2BFR0YtMqPq570J3dN7BPyFvdkA@mail.gmail.com> In-Reply-To: <CACqU3MVL14TxJ81rbM-Oq2P8GZCE0hPKzQpb5eJqZ32YdowSjQ@mail.gmail.com> References: <CACqU3MUefo4mG3GdZnj6kxxFx4H_M3-NLys8pCKptqNU4r_ywA@mail.gmail.com> <CACqU3MVs1mpiQpjE9xC8aFAKxhzbjUgC_6GKWdAkyr8OGJhycw@mail.gmail.com> <CAJ-FndDz6eRamnf7v6kZwwZQp-JaLYUKX6Gx7MYuZGEFNagmfQ@mail.gmail.com> <CACqU3MV-mDHzmnXY3Mzc%2BBnimJSnUTAPk66fh%2Bzzdfgz4OyPFg@mail.gmail.com> <CACqU3MVL14TxJ81rbM-Oq2P8GZCE0hPKzQpb5eJqZ32YdowSjQ@mail.gmail.com>
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Hi, On Wed, Feb 29, 2012 at 12:59 PM, Arnaud Lacombe <lacombar@gmail.com> wrote: > Hi, > > On Mon, Feb 27, 2012 at 12:48 PM, Arnaud Lacombe <lacombar@gmail.com> wrote: >> Hi, >> >> On Mon, Feb 27, 2012 at 10:36 AM, Attilio Rao <attilio@freebsd.org> wrote: >>> 2012/2/27, Arnaud Lacombe <lacombar@gmail.com>: >>>> Hi, >>>> >>>> On Tue, Feb 14, 2012 at 11:41 AM, Arnaud Lacombe <lacombar@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. - Arnaud
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