Congratulations Yannick!
So, it seems mainly RCU vs. timer(?) problem. I send CC of this message

to RCU author, linux-kernel and netdev lists.
I'm not sure how much time you could/will to offer for this debugging.

Anyway, if it's possible I think it would be interesting to check with

CONFIG_PREEMPT_RCU = y again, but CONFIG_HOTPLUG_CPU = n ("Processor

type and features --> Support for suspend on SMP and ...") in the

meantime.
Many thanks,

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Interesting!  Any chance of a pointer to the original messages?

A quick Google search and a look at LKML showed me nothing.  :-/
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Thanks to Raphael for pointing me at the above bugzilla URL!
Yannick,
Would you be willing to try your test again after applying the

patch in http://lkml.org/lkml/2008/2/2/11 and rebuilding your

kernel?
This patch does not appear to be in 2.6.25-rc3.  :-(
I am reposting this patch separately.
							Thanx, Paul

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(In reply to comment #20)

 > Reply-To: paulmck@linux.vnet.ibm.com

 >

 > Would you be willing to try your test again after applying the

 > patch in http://lkml.org/lkml/2008/2/2/11 and rebuilding your

 > kernel?

 >

 > This patch does not appear to be in 2.6.25-rc3.  :-(

 >

 > I am reposting this patch separately.

 >

 >                                                         Thanx, Paul
Congratulations Paul and thanks a lot to Jarek , It works,

no more hang or slow boot :

[1.061675] Calling initcall 0xc03b8e10: inet_init+0x0/0x3ba()

[1.061895] NET: Registered protocol family 2

[1.339007] IP route cache hash table entries: 32768 (order: 5, 131072 bytes)

[1.339470] TCP established hash table entries: 131072 (order: 8, 1048576

bytes)

[1.340375] TCP bind hash table entries: 65536 (order: 9, 2359296 bytes)

[1.349809] TCP: Hash tables configured (established 131072 bind 65536)

[1.349906] TCP reno registered

[1.098514] initcall 0xc03b8e10: inet_init+0x0/0x3ba() returned 0.

[1.098604] initcall 0xc03b8e10 ran for 32 msecs: inet_init+0x0/0x3ba()
Yannick

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Thank you very much for testing this, Yannick!
Andrew and Ingo have this patch on track to merge into a later -rc

of 2.6.25, so we will get there.  ;-)
						Thanx, Paul

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