Messages in this thread | | | From | Seiji Aguchi <> | Date | Mon, 24 Oct 2011 18:24:14 -0400 | Subject | RE: kdump: crash_kexec()-smp_send_stop() race in panic |
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Hi,
>> >>> 1st CPU: >> >>> panic()->crash_kexec()->mutex_trylock(&kexec_mutex)-> do kdump >> >>> >> >>> 2nd CPU: >> >>> panic()->crash_kexec()->kexec_mutex already held by 1st CPU >> >>> ->smp_send_stop()-> stop CPU 1 (stop kdump) >> >>> >> >>> How should we fix this problem? One possibility could be to do >> >>> smp_send_stop() before we call crash_kexec().
http://lkml.org/lkml/2010/9/16/353
I developed a patch solving this issue one year ago. (Just adding local_irq_disable in kexec path.)
I hope this helps.
Seiji
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