From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [xen-unstable test] 11807: regressions - FAIL
Date: Thu, 2 Feb 2012 15:49:38 +0000
Message-ID: <4F2AB092.7020003@citrix.com>
References: <osstest-11807-mainreport@xen.org>
	<20266.33471.444202.819846@mariner.uk.xensource.com>
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To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Wei Wang <wei.wang2@amd.com>, George Dunlap <George.Dunlap@eu.citrix.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Keir Fraser <keir.xen@gmail.com>, Jan Beulich <JBeulich@suse.com>
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This patch ought to help narrow down the problem.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com


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# HG changeset patch
# Parent e2722b24dc0962de37215320b05d1bb7c4c42864
IRQ: Add extra debugging to help track down why this assertion is failing

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff -r e2722b24dc09 xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -608,6 +608,8 @@ void move_native_irq(struct irq_desc *de
     desc->handler->enable(desc);
 }
 
+static void dump_irqs(unsigned char key);
+
 fastcall void smp_irq_move_cleanup_interrupt(struct cpu_user_regs *regs)
 {
     unsigned vector, me;
@@ -667,7 +669,18 @@ fastcall void smp_irq_move_cleanup_inter
 
             if ( desc->arch.used_vectors )
             {
-                ASSERT(test_bit(vector, desc->arch.used_vectors));
+                if ( unlikely(!test_bit(vector, desc->arch.used_vectors)) )
+                {
+                    bitmap_scnlistprintf(keyhandler_scratch,
+                                         sizeof(keyhandler_scratch),
+                                         desc->arch.used_vectors->_bits,
+                                         NR_VECTORS);
+                    printk("*** IRQ BUG found ***\n"
+                           "CPU%d -Testing vector %d from bitmap %s\n",
+                           me, vector, keyhandler_scratch);
+                    dump_irqs('i');
+                    BUG();
+                }
                 clear_bit(vector, desc->arch.used_vectors);
             }
         }

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