Hi,
Michal Piotrowski wrote:
------------[ cut here ]------------
kernel BUG at /usr/src/linux-mm/include/linux/mm.h:302!
invalid opcode: 0000 [#1]
PREEMPT SMP DEBUG_PAGEALLOC
last sysfs file: /class/vc/vcsa7/dev
Modules linked in: binfmt_misc thermal fan processor ipv6 w83627hf
hwmon_vid hwmon i2c_isa snd_intel8x0 snd_ac97_codec snd_ac97_bus
sk98lin snd_pcm_oss snd_mixer_oss skge intel_agp snd_pcm snd_timer snd
soundcore i2c_i801 parport_pc parport snd_page_alloc 8250_pnp 8250
serial_core agpgart rtc ide_cd cdrom hw_random unix
CPU: 0
EIP: 0060:[<b013fe81>] Not tainted VLI
EFLAGS: 00210246 (2.6.16-rc1-mm3 #1)
EIP is at release_pages+0x33/0x15e
Is it repeatable?
If so, I'd imagine it must be a specific driver page which is not properly
refcounted somewhere. A bug in generic code would have shown up elsewhere
by now.
Can you try something like the attached patch and see what it gives you?
Thanks,
Nick
--
SUSE Labs, Novell Inc.
Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h
+++ linux-2.6/include/linux/mm.h
@@ -15,6 +15,7 @@
#include <linux/prio_tree.h>
#include <linux/fs.h>
#include <linux/mutex.h>
+#include <linux/kallsyms.h>
struct mempolicy;
struct anon_vma;
@@ -264,6 +265,8 @@ struct page {
void *virtual; /* Kernel virtual address (NULL if
not kmapped, ie. highmem) */
#endif /* WANT_PAGE_VIRTUAL */
+
+ void *debug;
};
#define page_private(page) ((page)->private)
@@ -294,8 +297,14 @@ struct page {
*/
static inline int put_page_testzero(struct page *page)
{
- BUG_ON(atomic_read(&page->_count) == 0);
- return atomic_dec_and_test(&page->_count);
+ if (unlikely(atomic_read(&page->_count) == 0)) {
+ printk(KERN_WARNING "put_page_testzero found free page (flags = %lx)\n", page->flags);
+ if (page->debug)
+ print_symbol(KERN_WARNING "nopage is %s\n", (unsigned long)page->debug);
+ WARN_ON(1);
+ return 0;
+ } else
+ return atomic_dec_and_test(&page->_count);
}
/*
Index: linux-2.6/mm/memory.c
===================================================================
--- linux-2.6.orig/mm/memory.c
+++ linux-2.6/mm/memory.c
@@ -2056,6 +2056,8 @@ retry:
if (new_page == NOPAGE_OOM)
return VM_FAULT_OOM;
+ new_page->debug = (struct address_space *)vma->vm_ops->nopage;
+
/*
* Should we do an early C-O-W break?
*/
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c
+++ linux-2.6/mm/page_alloc.c
@@ -521,6 +521,8 @@ static int prep_new_page(struct page *pa
if (PageReserved(page))
return 1;
+ page->debug = NULL;
+
page->flags &= ~(1 << PG_uptodate | 1 << PG_error |
1 << PG_referenced | 1 << PG_arch_1 |
1 << PG_checked | 1 << PG_mappedtodisk);
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
