Re: [Xen-devel] 2.6.7-xen0 hang on boot

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Very weird. We do some odd things to patch up negative-offset segment
offsets, so perhaps trying with 'nosegfixup' added to Linux cmdline
would be worthwhile. Apart from that, I'll download FC3 myself -- is
it Fedora Core 3 Test 1 that you are using?

 Cheers,
 Keir

> I'm trying to run today's bitkeeper snapshot with kernel
> 2.6.7 in dom0.  On bootup time it gets past rc.sysinit
> just fine, but after that init fails to switch to runlevel 3.
> 
> Compiling the xen0 kernel with magic sysrq report (should
> that be on by default in defconfig?) shows me that init is
> running every time I press alt-sysrq-p and have caught a
> number of call traces, most involving upcalls but one real
> gem that looks relevant:
> 
> page_fault -> ... -> do_page_fault -> expand_stack
> 
> Other common ones are:
> 
> page_fault  (all by itself)
> 
> work_notifysig -> do_notify_resume -> evtchn_do_upcall -> do_IRQ -> 
> do_softirq -> do_signal -> get_signal_to_deliver -> force_evtchn_callback
> 
> page_fault -> evtchn_do_upcall -> do_IRQ -> do_softirq -> __do_softirq -> 
> do_page_fault -> force_sig_info -> force_evtchn_callback
> 
> page_fault -> evtchn_do_upcall -> do_IRQ -> do_softirq -> do_signal -> 
> do_page_fault
> 
> Sometimes init is running with the EIP at 0x91fef3, which I 
> suspect is just its won executable or libc.
> 
> This is trying to boot Fedora Core 3 / rawhide userland.
> 
> Things work when I start init=/bin/bash and the normal bootup
> sequence makes it all the way to the end of rc.sysinit.
> 
> Things only start failing when init tries to change runlevels.
> 
> I am wondering if there's something special about the way Xen
> has the virtual memory layout, something that could interfere
> with init changing its own commandline or environment...
> 
> kind regards,
> 
> Rik
> -- 
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
> 
> 
> 
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