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KAMEZAWA Hiroyuki ebb76ce16d memcg: fix wrong VM_BUG_ON() in try_charge()'s mm->owner check 
At __mem_cgroup_try_charge(), VM_BUG_ON(!mm->owner) is checked.
But as commented in mem_cgroup_from_task(), mm->owner can be NULL
in some racy case. This check of VM_BUG_ON() is bad.

A possible story to hit this is at swapoff()->try_to_unuse(). It passes
mm_struct to mem_cgroup_try_charge_swapin() while mm->owner is NULL. If we
can't get proper mem_cgroup from swap_cgroup information, mm->owner is used
as charge target and we see NULL.

Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reported-by: Hugh Dickins <hughd@google.com>
Reported-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2010-12-30 10:07:06 -08:00
..
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2010-10-22 17:31:36 -07:00
Kconfig.debug
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Makefile percpu: use percpu allocator on UP too 2010-10-02 10:26:05 +03:00
backing-dev.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
bootmem.c x86, memblock: Replace e820_/_early string with memblock_ 2010-08-27 11:13:47 -07:00
bounce.c bounce: call flush_dcache_page() after bounce_copy_vec() 2010-09-09 18:57:25 -07:00
compaction.c mm/compaction.c: avoid double mem_cgroup_del_lru() 2010-12-22 19:43:33 -08:00
debug-pagealloc.c
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dmapool.c mm: add a might_sleep_if() to dma_pool_alloc() 2010-10-26 16:52:08 -07:00
fadvise.c
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failslab.c
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filemap.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
filemap_xip.c
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fremap.c Avoid pgoff overflow in remap_file_pages 2010-09-25 09:34:58 -07:00
highmem.c mm,x86: fix kmap_atomic_push vs ioremap_32.c 2010-10-27 18:03:05 -07:00
hugetlb.c mm/hugetlb.c: avoid double unlock_page() in hugetlb_fault() 2010-12-02 14:51:14 -08:00
hwpoison-inject.c HWPOISON, hugetlb: support hwpoison injection for hugepage 2010-08-11 09:23:11 +02:00
init-mm.c
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internal.h mm: fix is_mem_section_removable() page_order BUG_ON check 2010-10-26 16:52:11 -07:00
kmemcheck.c
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kmemleak-test.c
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kmemleak.c
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ksm.c ksm: annotate ksm_thread_mutex is no deadlock source 2010-12-02 14:51:15 -08:00
maccess.c MN10300: Save frame pointer in thread_info struct rather than global var 2010-10-27 17:29:01 +01:00
madvise.c
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memblock.c memblock: Annotate memblock functions with __init_memblock 2010-10-11 16:00:52 -07:00
memcontrol.c memcg: fix wrong VM_BUG_ON() in try_charge()'s mm->owner check 2010-12-30 10:07:06 -08:00
memory-failure.c mem-hotplug: introduce {un}lock_memory_hotplug() 2010-12-02 14:51:15 -08:00
memory.c use clear_page()/copy_page() in favor of memset()/memcpy() on whole pages 2010-10-26 16:52:13 -07:00
memory_hotplug.c mem-hotplug: introduce {un}lock_memory_hotplug() 2010-12-02 14:51:15 -08:00
mempolicy.c mm/mempolicy.c: add rcu read lock to protect pid structure 2010-12-02 14:51:14 -08:00
mempool.c
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migrate.c mm/migrate.c: fix compilation error 2010-12-22 19:43:34 -08:00
mincore.c
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mlock.c mm: Move vma_stack_continue into mm.h 2010-09-09 09:05:06 -07:00
mm_init.c
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mmap.c install_special_mapping skips security_file_mmap check. 2010-12-15 12:30:36 -08:00
mmu_context.c
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mmu_notifier.c
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mmzone.c mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake 2010-09-09 18:57:25 -07:00
mprotect.c perf_events: Fix perf_counter_mmap() hook in mprotect() 2010-11-09 10:19:38 -08:00
mremap.c mm: remove pte_*map_nested() 2010-10-26 16:52:08 -07:00
msync.c
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nommu.c nommu: Provide stubbed alloc/free_vm_area() implementation. 2010-12-24 12:08:30 +09:00
oom_kill.c oom: kill all threads sharing oom killed task's mm 2010-10-26 16:52:05 -07:00
page-writeback.c writeback: do uninterruptible sleep in balance_dirty_pages() 2010-12-22 19:43:33 -08:00
page_alloc.c PM / Hibernate: Fix memory corruption related to swap 2010-12-06 23:52:08 +01:00
page_cgroup.c
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page_io.c
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page_isolation.c mm: page_isolation: codeclean fix comment and rm unneeded val init 2010-10-26 16:52:11 -07:00
pagewalk.c mm: remove call to find_vma in pagewalk for non-hugetlbfs 2010-11-25 06:50:46 +09:00
percpu-km.c percpu: clear memory allocated with the km allocator 2010-10-02 10:28:42 +03:00
percpu-vm.c
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percpu.c percpu: print out alloc information with KERN_DEBUG instead of KERN_INFO 2010-12-22 14:19:14 +01:00
prio_tree.c
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quicklist.c
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readahead.c
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rmap.c rmap: make anon_vma_chain_free() static 2010-10-26 16:52:10 -07:00
shmem.c convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
slab.c replace nested max/min macros with {max,min}3 macro 2010-10-26 16:52:12 -07:00
slob.c slob: fix gfp flags for order-0 page allocations 2010-10-02 10:24:28 +03:00
slub.c slub: Fix a crash during slabinfo -v 2010-12-04 09:53:49 +02:00
sparse-vmemmap.c x86: Use memblock to replace early_res 2010-08-27 11:12:29 -07:00
sparse.c
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swap.c fuse: use release_pages() 2010-10-27 18:03:17 -07:00
swap_state.c
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swapfile.c /proc/swaps: support polling 2010-10-26 16:52:11 -07:00
thrash.c
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truncate.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
util.c export __get_user_pages_fast() function 2010-10-24 10:51:24 +02:00
vmalloc.c vmalloc: eagerly clear ptes on vunmap 2010-12-02 14:51:15 -08:00
vmscan.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
vmstat.c vmstat: fix dirty threshold ordering 2010-12-02 14:51:14 -08:00