Date: Sat, 30 Jul 2005 00:49:10 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: Consistent file system hang with RELENG_6 of today ... Message-ID: <20050730004750.G24801@ganymede.hub.org> In-Reply-To: <20050729141816.I74149@fledge.watson.org> References: <20050728231728.E968@ganymede.hub.org> <20050729092127.V74149@fledge.watson.org> <20050729095407.O997@ganymede.hub.org> <20050729141816.I74149@fledge.watson.org>
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'k, this is turning out to be alot of fun ... the only machines I have here that I can use to talk to the portmaster are Windows boxes ... can you recommend a client for windows that would do good logging similar to what 'script' does under FreeBSD? :( On Fri, 29 Jul 2005, Robert Watson wrote: > > On Fri, 29 Jul 2005, Marc G. Fournier wrote: > >> Oh, before I forget ... how do you break to DDB from a serial console? I'll >> be running a Portmaster for this ... > > Compile BREAK_TO_DEBUGGER into the kernel. Then issue a serial break and it > should go into the debugger if the low-level console is set to the serial > port. > > On my port-master, I issue a telnet break using "send break" after hitting ^] > to generate a serial break for a serial port hooked up to TCP. > > There's also ALT_BREAK_TO_DEBUGGER, which is documented in NOTES, and > provides for an alternative key sequence that doesn't use a break signal. > > Robert N M Watson > >> >> On Fri, 29 Jul 2005, Robert Watson wrote: >> >>> >>> On Thu, 28 Jul 2005, Marc G. Fournier wrote: >>> >>>> 'k, I'm starting to play with 6.x, for our new server ... my priority >>>> right now is to just have it run the existing 'jail' environments from my >>>> 4.x machine, while I work on getting all of our servers up to 6.x, and >>>> then will worry about the jail's themselves ... >>>> >>>> When I try and startup the 4.x jail on my 6.x machine, it "hangs" the >>>> file system that the jail directory hierarchy happens to be mounted on >>>> though ... twice in a row so far ... >>>> >>>> Now, I'm suspecting (and am going to try without it) that it might be >>>> because I'm mounting devfs within the 4.x jail, but even then, it >>>> shouldn't hang things up, only generate a whack of errors ... >>>> >>>> I have a good dump (CTL-ALT-ESC -> panic), but do not have a clue what to >>>> offer from within there that might be of any use ... >>>> >>>> If anyone is interested ... ? >>> >>> If you can get into DDB and have serial console output, the following >>> would be useful: >>> >>> The output of 'show pcpu' >>> >>> The output of 'show pcpu X' for each present cpu, starting with 0. >>> >>> The output of 'ps' >>> >>> The output of 'trace' for the currently running thread, and each non-idle >>> thread shown in the show pcpu output >>> >>> The output of 'show lockedvnods' >>> >>> It would also be useful if, relating to the startup of the jail, you can >>> identify the point in the jail boot where it wedges, and if you hit >>> Ctrl-T, what process is shown as running and what state it is in, and >>> using DDB, trace that process. >>> >>> If you could show the trace output for each process listed in "show >>> lockevnods". >>> >>> Likely, there is a leaked lock or a low buffer condition. However, once >>> we have the above output we should be able to say more. The above will >>> hopefully tell us whether it's a vnode deadlock, and ideally, the >>> approximate source. >>> >>> Robert N M Watson >>> >>> >> >> ---- >> Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) >> Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664 >> > > ---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
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