Re: missing VM_IO (Xen 3.4 and Linux 3.0-rc5)

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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On Sat, Jul 02, 2011 at 04:21:59AM +0400, George Shuklin wrote:
> Good day.
> 
> Got this message from kernel:
> 
> [5748467.183247] ------------[ cut here ]------------
> [5748467.183270] WARNING: at arch/x86/xen/mmu.c:492
> xen_make_pte_debug+0x9f/0x13
> 0()
> [5748467.183280] 0x1df7b000 is missing VM_IO (and wasn't fixed)!
> [5748467.183289] Pid: 884, comm: blogd Not tainted 3.0.0-rc5+ #10
> [5748467.183296] Call Trace:
> [5748467.183306]  [<ffffffff81004caf>] ? xen_make_pte_debug+0x9f/0x130
> [5748467.183318]  [<ffffffff81046e56>] ? warn_slowpath_common+0x76/0xc0
> [5748467.183329]  [<ffffffff81046f15>] ? warn_slowpath_fmt+0x45/0x50
> [5748467.183339]  [<ffffffff81029bb2>] ? pvclock_clocksource_read+0x52/0xf0
> [5748467.183350]  [<ffffffff81004caf>] ? xen_make_pte_debug+0x9f/0x130
> [5748467.183361]  [<ffffffff810047db>] ?
> __raw_callee_save_xen_make_pte_debug+0x
> 11/0x1e
> [5748467.183375]  [<ffffffff810e90c8>] ? mprotect_fixup+0x518/0x8d0
> [5748467.183387]  [<ffffffff8102aea8>] ? do_page_fault+0x1c8/0x460
> [5748467.183396]  [<ffffffff810e961a>] ? sys_mprotect+0x19a/0x260
> [5748467.183408]  [<ffffffff813de9d2>] ? system_call_fastpath+0x16/0x1b
> [5748467.183415] ---[ end trace 02c56baf98b43314 ]---
> [5748467.328453] irqbalance[905]: segfault at 4 ip 00007fcb22cabdec
> sp 00007fff8
> 8e32e60 error 6 in libc-2.11.2.so[7fcb22c10000+156000]
> [5748467.183415] ---[ end trace 02c56baf98b43314 ]---
> [5748467.328453] irqbalance[905]: segfault at 4 ip 00007fcb22cabdec
> sp 00007fff8
> 8e32e60 error 6 in libc-2.11.2.so[7fcb22c10000+156000]
> [5748509.028223] irqbalance[1037]: segfault at 4 ip 00007f8b03359dec
> sp 00007fff
> 9f75ea40 error 6 in libc-2.11.2.so[7f8b032be000+156000]
> 
> kernel command line:
> 
> CPUFREQ=no root=/dev/xvda2 noapic nolapic loglevel=7 debug

You don't need those 'CPUFREQ=no noapic nolapic' options. Can you provide the
full log please. The irqbalance issue is an issue with irqbalance - if you
want that fixed try the attached patch.


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--- irqbalance-0.56.orig/procinterrupts.c	2010-06-10 10:45:55.000000000 -0400
+++ irqbalance-0.56/procinterrupts.c	2011-05-10 20:22:06.897465003 -0400
@@ -50,7 +50,7 @@ void parse_proc_interrupts(void)
 		int cpunr;
 		int	 number;
 		uint64_t count;
-		char *c, *c2;
+		char *c, *c2, *err;
 
 		if (getline(&line, &size, file)==0)
 			break;
@@ -64,7 +64,11 @@ void parse_proc_interrupts(void)
 			continue;
 		*c = 0;
 		c++;
-		number = strtoul(line, NULL, 10);
+		number = strtoul(line, &err, 10);
+		/* Man page says that if that happens and number == 0, then it
+		 * failed to parse. */
+		if (err == line && number == 0)
+			continue;
 		count = 0;
 		cpunr = 0;
 

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