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Hugh Dickins ce48225fe3 memcg: fix endless loop in __mem_cgroup_iter_next() 
Commit 0eef615665ed ("memcg: fix css reference leak and endless loop in
mem_cgroup_iter") got the interaction with the commit a few before it
d8ad30559715 ("mm/memcg: iteration skip memcgs not yet fully
initialized") slightly wrong, and we didn't notice at the time.

It's elusive, and harder to get than the original, but for a couple of
days before rc1, I several times saw a endless loop similar to that
supposedly being fixed.

This time it was a tighter loop in __mem_cgroup_iter_next(): because we
can get here when our root has already been offlined, and the ordering
of conditions was such that we then just cycled around forever.

Fixes: 0eef615665ed ("memcg: fix css reference leak and endless loop in mem_cgroup_iter").
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: <stable@vger.kernel.org>	[3.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-03-04 07:55:47 -08:00
..
backing-dev.c
mm/backing-dev.c: check user buffer length before copying data to the related user buffer
2013-09-11 15:58:03 -07:00
balloon_compaction.c
mm: print more details for bad_page()
2014-01-23 16:36:50 -08:00
bootmem.c
mm/bootmem.c: remove unused local `map'
2013-11-13 12:09:09 +09:00
bounce.c
block: Convert bio_for_each_segment() to bvec_iter
2013-11-23 22:33:49 -08:00
cleancache.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
compaction.c
mm: improve documentation of page_order
2014-01-23 16:36:53 -08:00
debug-pagealloc.c
…
dmapool.c
dmapool: make DMAPOOL_DEBUG detect corruption of free marker
2012-12-11 17:22:24 -08:00
fadvise.c
teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long
2013-03-03 22:46:22 -05:00
failslab.c
…
filemap_xip.c
seqcount: Add lockdep functionality to seqcount/seqlock structures
2013-11-06 12:40:26 +01:00
filemap.c
fix O_SYNC|O_APPEND syncing the wrong range on write()
2014-02-09 15:18:09 -05:00
fremap.c
mm: fix use-after-free in sys_remap_file_pages
2014-01-02 14:40:30 -08:00
frontswap.c
frontswap: fix incorrect zeroing and allocation size for frontswap_map
2013-06-12 16:29:46 -07:00
highmem.c
Some nice cleanups, and even a patch my wife did as a "live" demo for
2012-12-20 08:37:05 -08:00
huge_memory.c
mm, thp: fix infinite loop on memcg OOM
2014-02-25 15:25:44 -08:00
hugetlb_cgroup.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
hugetlb.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
hwpoison-inject.c
mm/hwpoison: add '#' to hwpoison_inject
2014-01-21 16:19:48 -08:00
init-mm.c
…
internal.h
mm/page-writeback.c: do not count anon pages as dirtyable memory
2014-01-29 16:22:39 -08:00
interval_tree.c
mm: add CONFIG_DEBUG_VM_RB build option
2012-10-09 16:22:42 +09:00
Kconfig
zsmalloc: move it under mm
2014-01-30 16:56:55 -08:00
Kconfig.debug
…
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c
mm: kmemleak: avoid false negatives on vmalloc'ed objects
2013-11-13 12:09:07 +09:00
ksm.c
mm: close PageTail race
2014-03-04 07:55:47 -08:00
list_lru.c
mm: list_lru: fix almost infinite loop causing effective livelock
2013-10-30 12:57:46 -07:00
maccess.c
…
madvise.c
mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood
2013-09-30 14:31:02 -07:00
Makefile
zsmalloc: move it under mm
2014-01-30 16:56:55 -08:00
memblock.c
memblock: add limit checking to memblock_virt_alloc
2014-01-29 16:22:40 -08:00
memcontrol.c
memcg: fix endless loop in __mem_cgroup_iter_next()
2014-03-04 07:55:47 -08:00
memory_hotplug.c
mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug
2014-01-23 16:36:52 -08:00
memory-failure.c
mm: close PageTail race
2014-03-04 07:55:47 -08:00
memory.c
mm, thp: fix infinite loop on memcg OOM
2014-02-25 15:25:44 -08:00
mempolicy.c
mm/mempolicy.c: fix mempolicy printing in numa_maps
2014-01-30 16:56:56 -08:00
mempool.c
mm/mempool.c: convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)
2013-09-11 15:58:14 -07:00
migrate.c
mm/migrate.c: fix setting of cpupid on page migration twice against normal page
2014-01-27 21:02:40 -08:00
mincore.c
mm: do_mincore() cleanup
2014-01-23 16:36:52 -08:00
mlock.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
mm_init.c
mm: bring back /sys/kernel/mm
2014-01-27 21:02:39 -08:00
mmap.c
mm: ignore VM_SOFTDIRTY on VMA merging
2014-01-23 16:36:53 -08:00
mmu_context.c
mm: remove old aio use_mm() comment
2013-05-07 18:38:27 -07:00
mmu_notifier.c
mm: audit/fix non-modular users of module_init in core code
2014-01-23 16:36:52 -08:00
mmzone.c
mm: numa: Change page last {nid,pid} into {cpu,pid}
2013-10-09 14:47:45 +02:00
mprotect.c
mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit
2014-02-17 11:19:36 +11:00
mremap.c
mm: revert mremap pud_free anti-fix
2013-10-16 21:35:53 -07:00
msync.c
…
nobootmem.c
mm/nobootmem: free_all_bootmem again
2014-01-23 16:36:52 -08:00
nommu.c
mm: add overcommit_kbytes sysctl variable
2014-01-21 16:19:44 -08:00
oom_kill.c
mm, oom: base root bonus on current usage
2014-01-30 16:56:56 -08:00
page_alloc.c
mm: close PageTail race
2014-03-04 07:55:47 -08:00
page_cgroup.c
Merge branch 'akpm' (incoming from Andrew)
2014-01-21 19:05:45 -08:00
page_io.c
Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block
2014-01-30 11:19:05 -08:00
page_isolation.c
mm: memory-hotplug: enable memory hotplug to handle hugepage
2013-09-11 15:57:48 -07:00
page-writeback.c
mm: __set_page_dirty_nobuffers() uses spin_lock_irqsave() instead of spin_lock_irq()
2014-02-06 13:48:51 -08:00
pagewalk.c
mm/pagewalk.c: fix walk_page_range() access of wrong PTEs
2013-10-30 14:27:03 -07:00
percpu-km.c
…
percpu-vm.c
mm: fix kernel-doc warnings
2012-06-20 14:39:36 -07:00
percpu.c
Merge branch 'akpm' (incoming from Andrew)
2014-01-21 19:05:45 -08:00
pgtable-generic.c
mm: fix TLB flush race between migration, and change_protection_range
2013-12-18 19:04:51 -08:00
process_vm_access.c
Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys
2013-03-12 11:05:45 -07:00
quicklist.c
…
readahead.c
mm/readahead.c: fix do_readahead() for no readpage(s)
2014-01-29 16:22:40 -08:00
rmap.c
mm/rmap: fix coccinelle warnings
2014-01-23 16:36:53 -08:00
shmem.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-01-28 08:38:04 -08:00
slab_common.c
slab: fix wrong retval on kmem_cache_create_memcg error path
2014-01-29 16:22:40 -08:00
slab.c
mm: Fix warning on make htmldocs caused by slab.c
2014-01-31 13:52:25 +02:00
slab.h
memcg, slab: RCU protect memcg_params for root caches
2014-01-23 16:36:51 -08:00
slob.c
mm/sl[aou]b: Move kmallocXXX functions to common code
2013-09-04 20:51:33 +03:00
slub.c
slub: do not assert not having lock in removing freed partial
2014-02-10 16:01:42 -08:00
sparse-vmemmap.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
sparse.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
swap_state.c
swap: add a simple detector for inappropriate swapin readahead
2014-02-06 13:48:51 -08:00
swap.c
mm: close PageTail race
2014-03-04 07:55:47 -08:00
swapfile.c
mm/swap: fix race on swap_info reuse between swapoff and swapon
2014-02-06 13:48:51 -08:00
truncate.c
truncate: drop 'oldsize' truncate_pagecache() parameter
2013-09-12 15:38:02 -07:00
util.c
mm: add overcommit_kbytes sysctl variable
2014-01-21 16:19:44 -08:00
vmalloc.c
Revert "mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}"
2014-01-27 21:02:39 -08:00
vmpressure.c
arm, pm, vmpressure: add missing slab.h includes
2014-02-03 13:24:01 -05:00
vmscan.c
mm/page-writeback.c: do not count anon pages as dirtyable memory
2014-01-29 16:22:39 -08:00
vmstat.c
mm, x86: Account for TLB flushes only when debugging
2014-01-25 09:10:41 +01:00
zbud.c
mm/zbud: fix some trivial typos in comments
2013-09-11 15:57:35 -07:00
zsmalloc.c
zsmalloc: add copyright
2014-01-30 16:56:55 -08:00
zswap.c
mm/zswap.c: change params from hidden to ro
2014-01-23 16:36:50 -08:00