Messages in this thread | | | Date | Thu, 27 Oct 2011 07:50:44 -0700 | Subject | Fwd: Regression: patch " hvc_console: display printk messages on console." causing infinite loop with 3.2-rc0 + Xen. | From | Miche Baker-Harvey <> |
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Bummer. Sorry about that. Konrad, could you give me a hand figuring out what's up with this - I'm not running Zen here. (If there's a test suite I could have run, mea culpa, and please point me in the right direction.)
The "console [hvc0] enabled" message is coming from register_console() in printk.c, and it doesn't have any loops. It's called from hvc_console_init(), hvc_instantiate(), and hvc_alloc(), none of which have loops. The call in hvc_alloc() is the one I added, so either I've inadvertently made one of the other two repeat (I'm guestting hvc_instantiate() is the one you're using), or you're infinitely calling hvc_alloc(). There's a calls to hvc_alloc() in hvc_xen.c::xen_hvc_init(), and in init_port_console() in virtio_console.c, but again, no loops. Similarly for hvc_instantiate().
So, could I trouble you to put a breakpoint in register_console() and send me the stack?
Thanks, Miche
On Wed, Oct 26, 2011 at 10:48 PM, Greg KH <gregkh@suse.de> wrote: > > On Thu, Oct 27, 2011 at 01:30:08AM -0400, Konrad Rzeszutek Wilk wrote: > > Hey Miche. > > > > The git commit 361162459f62dc0826b82c9690a741a940f457f0: > > > > hvc_console: display printk messages on console. > > > > is causing an infinite loop when booting Linux under Xen, as so: > > > > [ 2.382984] console [hvc0] enabled > > [ 2.382984] console [hvc0] enabled > > [ 2.382984] console [hvc0] enabled > > [ 2.382984] console [hvc0] enabled > > [ 2.382984] console [hvc0] enabled > > [ 2.382984] console [hvc0] enabled > > .. > > > > (see attached file titled bad.log) > > > > If I use Linus's latest git tree and revert your patch I get the kernel > > to bootup (see good.log file), > > Ick, not good, thanks for letting us know. > > Miche, want me to just revert this, or do you think you can fix it? > > thanks, > > greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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