Date: Tue, 14 Oct 2008 13:12:04 -0400 From: John Baldwin <jhb@freebsd.org> To: Gerrit =?iso-8859-1?q?K=FChn?= <gerrit@pmp.uni-hannover.de> Cc: freebsd-stable@freebsd.org, Jeremy Chadwick <koitsu@freebsd.org>, d@delphij.net, jeff@freebsd.org Subject: Re: Regression 7.0R -> 7-stable? Message-ID: <200810141312.05094.jhb@freebsd.org> In-Reply-To: <20081014115333.3d3e41ab.gerrit@pmp.uni-hannover.de> References: <20080807132947.061d24eb.gerrit@pmp.uni-hannover.de> <200810131027.40630.jhb@freebsd.org> <20081014115333.3d3e41ab.gerrit@pmp.uni-hannover.de>
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On Tuesday 14 October 2008 05:53:33 am Gerrit K=FChn wrote: > On Mon, 13 Oct 2008 10:27:40 -0400 John Baldwin <jhb@freebsd.org> wrote > about Re: Regression 7.0R -> 7-stable?: >=20 > JB> On Monday 13 October 2008 03:09:46 am Gerrit K=FChn wrote: >=20 > JB> > JB> Ok, can you run gdb on your kernel.debug and do > JB> > JB> 'l *0xffffffff804608c0' >=20 > JB> > 0xffffffff804608c0 is in scheduler (/usr/src/sys/vm/vm_glue.c:670). > JB> > [...lines 665-674...] >=20 > JB> I was afraid of that, it basically means that it finished the entire > JB> boot process. =20 >=20 > I already thought so because I saw a grey (not white) cursor afterwards. Are you sure you aren't using dual consoles somehow with serial being prima= ry? =20 If you break into the loader, what does 'show console' show? > JB> The next step is that init (pid 1) should be scheduled > JB> and try to execute. You can maybe add some printf's to the code to > JB> start up init to see how far it gets. The routine in question is > JB> 'start_init()' in sys/kern/init_main.c. >=20 > Let me see... > I added my first printf in line 619 (and several after that), right after > the "Need just enough stack..." comment. This was never reached, the > system hangs before that. >=20 > After that I added printf before and after vfs_mountroot(). Now the things > runs just a bit further for the first time. I see my new printfs and > between them the message "Trying to mount root from ufs:/dev/ad0s1a". > After that come all my printfs I had added before, followed by > "start_init: trying /sbin/init". Then it hangs again. >=20 > I am a bit puzzled because I did not see the "Trying to mount..." and > "start_init:..." messages before. Just trying again to boot with the > same setup hangs in vfs_mountroot() (printf before is displayed, printf > after not). It appears to me as if the hang is caused by some kind of > "parallel task", and what I am seeing on the console stops a bit earlier > or later depending on that. > As I am seeing this only with the ULE-scheduler: Is the scheduler already > in action at this point, and may the hang depend on what it is deciding > to do? Hmmm, I'm really not sure. I wonder if you are having some sort of interru= pt=20 storm. What if you disable SMP via 'kern.smp.disabled=3D1' in the loader, = does=20 that help at all? =2D-=20 John Baldwin
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