----- Original Message -----
 
 
 Hi Dave
 
 I tried the irq command on an ARM vmcore file with a fairly new
 kernel (3.4.0) and it did not work.
 
 crash> irq
 irq: cannot determine number of IRQs
 
 The problem is in arm.c
 
     if (symbol_exists("irq_desc"))
             ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc, "irq_desc", NULL,
0);
 
 as the symbol irq_desc does not exist any longer. Looking at x86_64.c
 I changed this to
 
     if (symbol_exists("irq_desc"))
             ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc, "irq_desc", NULL,
0);
     else if (kernel_symbol_exists("nr_irqs"))
             get_symbol_data("nr_irqs", sizeof(unsigned int),
&machdep->nr_irqs);
 
 and then the command worked as it should again.
 
 Jan 
Right -- it was a 2.6.34/CONFIG_SPARSE_IRQ change.  Queued for crash-6.1.5.
Thanks,
  Dave