Messages in this thread | | | Subject | Re: 2.6.25-rc: complete lockup on boot/start of X (bisected) | From | Peter Zijlstra <> | Date | Sun, 23 Mar 2008 20:06:08 +0100 |
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On Sun, 2008-03-23 at 19:46 +0100, Marcin Slusarz wrote:
> 4 different lockups: > http://alan.umcs.lublin.pl/~mslusarz/kernel/2008.03.23-lockup/
Brilliant, these are extremely helpful.
What seems to happen is a classic xtime deadlock, doing a xtime seq_readlock while holding a seq_writelock.
Only need to figure out _why_ that is happening....
> Are there any downsides of using nmi_watchdog=2 all the time?
Some machines are said to not boot due to NMIs, hence the default is off, but afaik, _if_ it works there are no downsides aside from the slight NMI handling overhead.
> ps: Documentation/nmi_watchdog.txt says: "Currently, local APIC mode > (nmi_watchdog=2) does not work on x86-64.". It's not true, so maybe someone > should update this file?
Care to send a patch to the x86 maintainers? :-)
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