Re: WARNING: __GFP_FS allocations with IRQs disabled (kmemcheck_alloc_shadow)

On Sun, 8 Jul 2012, Fengguang Wu wrote:

Hi Vegard,

This warning code is triggered for the attached config:

__lockdep_trace_alloc():
        /*
         * Oi! Can't be having __GFP_FS allocations with IRQs disabled.
         */
        if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
                return;

Where the irq is possibly disabled at the beginning of __slab_alloc():

Rights its possible. Depends on the callers specification of gfp flags.