Hugh Dickins 2022b4d18a mm: fix swapoff hang after page migration and fork ...

I've been seeing swapoff hangs in recent testing: it's cycling around
trying unsuccessfully to find an mm for some remaining pages of swap.

I have been exercising swap and page migration more heavily recently,
and now notice a long-standing error in copy_one_pte(): it's trying to
add dst_mm to swapoff's mmlist when it finds a swap entry, but is doing
so even when it's a migration entry or an hwpoison entry.

Which wouldn't matter much, except it adds dst_mm next to src_mm,
assuming src_mm is already on the mmlist: which may not be so.  Then if
pages are later swapped out from dst_mm, swapoff won't be able to find
where to replace them.

There's already a !non_swap_entry() test for stats: move that up before
the swap_duplicate() and the addition to mmlist.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Kelley Nielsen <kelleynnn@gmail.com>
Cc: <stable@vger.kernel.org>	[2.6.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2014-12-03 09:36:03 -08:00

..

backing-dev.c

Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block

2014-10-18 11:53:51 -07:00

balloon_compaction.c

mm/balloon_compaction: fix deflation when compaction is disabled

2014-10-29 16:33:15 -07:00

bootmem.c

mem-hotplug: reset node managed pages when hot-adding a new pgdat

2014-11-13 16:17:06 -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

cma.c

mm: cma: Use %pa to print physical addresses

2014-10-27 13:00:55 +01:00

compaction.c

mm, compaction: prevent infinite loop in compact_zone

2014-11-13 16:17:06 -08:00

debug-pagealloc.c

…

debug.c

mm/debug.c: use pr_emerg()

2014-10-09 22:25:59 -04:00

dmapool.c

mm/dmapool.c: fixed a brace coding style issue

2014-10-09 22:26:00 -04:00

early_ioremap.c

mm: create generic early_ioremap() support

2014-04-07 16:36:15 -07:00

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

mm/filemap.c: remove trailing whitespace

2014-10-09 22:26:00 -04:00

fremap.c

mm: mark remap_file_pages() syscall as deprecated

2014-06-06 16:08:17 -07:00

frontswap.c

mm: frontswap: invalidate expired data on a dup-store failure

2014-12-02 17:32:07 -08:00

gup.c

mm: introduce a general RCU get_user_pages_fast()

2014-10-09 22:26:00 -04:00

highmem.c

mm/highmem: make kmap cache coloring aware

2014-08-06 18:01:22 -07:00

huge_memory.c

mm, thp: fix collapsing of hugepages on madvise

2014-10-29 16:33:14 -07:00

hugetlb_cgroup.c

hugetlb_cgroup: use lockdep_assert_held rather than spin_is_locked

2014-08-29 16:28:16 -07:00

hugetlb.c

mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA

2014-10-09 22:25:57 -04:00

hwpoison-inject.c

mm/hwpoison-inject.c: remove unnecessary null test before debugfs_remove_recursive

2014-08-06 18:01:19 -07:00

init-mm.c

…

internal.h

mm/page_alloc: restrict max order of merging on isolated pageblock

2014-11-13 16:17:05 -08:00

interval_tree.c

mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA

2014-10-09 22:25:57 -04:00

iov_iter.c

Fix thinko in iov_iter_single_seg_count

2014-11-13 13:28:55 -05:00

Kconfig

mm/balloon_compaction: add vmstat counters and kpageflags bit

2014-10-09 22:26:01 -04:00

Kconfig.debug

…

kmemcheck.c

mm/slab_common: move kmem_cache definition to internal header

2014-10-09 22:25:50 -04:00

kmemleak-test.c

mm/kmemleak-test.c: use pr_fmt for logging

2014-06-06 16:08:18 -07:00

kmemleak.c

mm: introduce kmemleak_update_trace()

2014-06-06 16:08:17 -07:00

ksm.c

mm: ksm use pr_err instead of printk

2014-10-09 22:26:00 -04:00

list_lru.c

mm: keep page cache radix tree nodes in check

2014-04-03 16:21:01 -07:00

maccess.c

…

madvise.c

mm: update the description for madvise_remove

2014-08-06 18:01:18 -07:00

Makefile

Fixup for 3.18: use PATCHv2 of "mm: Support compiling out madvise and fadvise"

2014-10-12 09:21:57 -04:00

memblock.c

mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range()

2014-09-10 15:42:12 -07:00

memcontrol.c

mm: memcontrol: fix missed end-writeback page accounting

2014-10-29 16:33:15 -07:00

memory_hotplug.c

mem-hotplug: reset node present pages when hot-adding a new pgdat

2014-11-13 16:17:06 -08:00

memory-failure.c

cgroup: remove redundant check in cgroup_ino()

2014-09-19 09:16:23 -04:00

memory.c

mm: fix swapoff hang after page migration and fork

2014-12-03 09:36:03 -08:00

mempolicy.c

mm: mempolicy: skip inaccessible VMAs when setting MPOL_MF_LAZY

2014-10-09 22:26:02 -04:00

mempool.c

mm/mempool.c: update the kmemleak stack trace for mempool allocations

2014-06-06 16:08:17 -07:00

migrate.c

mm/balloon_compaction: redesign ballooned pages management

2014-10-09 22:26:01 -04:00

mincore.c

mm + fs: prepare for non-page entries in page cache radix trees

2014-04-03 16:21:00 -07:00

mlock.c

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-10-13 15:44:12 +02:00

mm_init.c

mm: bring back /sys/kernel/mm

2014-01-27 21:02:39 -08:00

mmap.c

mm, thp: fix collapsing of hugepages on madvise

2014-10-29 16:33:14 -07:00

mmu_context.c

sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm

2014-02-21 08:50:17 +01:00

mmu_notifier.c

kvm: Fix page ageing bugs

2014-09-24 14:07:58 +02:00

mmzone.c

mm: numa: Change page last {nid,pid} into {cpu,pid}

2013-10-09 14:47:45 +02:00

mprotect.c

mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared

2014-10-14 02:18:28 +02:00

mremap.c

mm/mremap.c: use linux headers

2014-10-09 22:26:00 -04:00

msync.c

msync: fix incorrect fstart calculation

2014-07-03 09:21:53 -07:00

nobootmem.c

mem-hotplug: reset node managed pages when hot-adding a new pgdat

2014-11-13 16:17:06 -08:00

nommu.c

percpu_counter: add @gfp to percpu_counter_init()

2014-09-08 09:51:29 +09:00

oom_kill.c

OOM, PM: OOM killed task shouldn't escape PM suspend

2014-10-21 23:44:21 +02:00

page_alloc.c

mm/debug-pagealloc: correct freepage accounting and order resetting

2014-11-13 16:17:06 -08:00

page_cgroup.c

cgroup/kmemleak: add kmemleak_free() for cgroup deallocations.

2014-10-29 16:33:13 -07:00

page_io.c

fix __swap_writepage() compile failure on old gcc versions

2014-06-14 19:30:48 -05:00

page_isolation.c

mm/page_alloc: restrict max order of merging on isolated pageblock

2014-11-13 16:17:05 -08:00

page-writeback.c

mm: memcontrol: fix missed end-writeback page accounting

2014-10-29 16:33:15 -07:00

pagewalk.c

mm: use VM_BUG_ON_MM where possible

2014-10-09 22:25:58 -04:00

percpu-km.c

percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated

2014-09-02 14:46:05 -04:00

percpu-vm.c

percpu: move region iterations out of pcpu_[de]populate_chunk()

2014-09-02 14:46:02 -04:00

percpu.c

percpu: fix how @gfp is interpreted by the percpu allocator

2014-10-08 12:01:52 -04:00

pgtable-generic.c

mm: actually clear pmd_numa before invalidating

2014-08-29 16:28:15 -07:00

process_vm_access.c

start adding the tag to iov_iter

2014-05-06 17:32:49 -04:00

quicklist.c

…

readahead.c

mm/readahead.c: remove unused file_ra_state from count_history_pages

2014-08-06 18:01:15 -07:00

rmap.c

mm: rmap: split out page_remove_file_rmap()

2014-10-29 16:33:15 -07:00

shmem.c

shmem: support RENAME_WHITEOUT

2014-10-24 00:14:37 +02:00

slab_common.c

mm/slab: fix unalignment problem on Malta with EVA due to slab merge

2014-11-13 16:17:05 -08:00

slab.c

mm/slab: fix unaligned access on sparc64

2014-10-14 02:18:12 +02:00

slab.h

mm/slab: use percpu allocator for cpu cache

2014-10-09 22:25:51 -04:00

slob.c

mm/sl[ao]b: always track caller in kmalloc_(node_)track_caller()

2014-10-09 22:25:50 -04:00

slub.c

mm/slab_common: commonize slab merge logic

2014-10-09 22:25:51 -04:00

sparse-vmemmap.c

mm/sparse: use memblock apis for early memory allocations

2014-01-21 16:19:47 -08:00

sparse.c

mm: use macros from compiler.h instead of __attribute__((...))

2014-04-07 16:35:54 -07:00

swap_state.c

mm: memcontrol: do not kill uncharge batching in free_pages_and_swap_cache

2014-10-09 22:25:59 -04:00

swap.c

mm: memcontrol: do not kill uncharge batching in free_pages_and_swap_cache

2014-10-09 22:25:59 -04:00

swapfile.c

mm: memcontrol: rewrite uncharge API

2014-08-08 15:57:17 -07:00

truncate.c

mm: Fix comment before truncate_setsize()

2014-11-07 08:29:25 +11:00

util.c

proc/maps: make vm_is_stack() logic namespace-friendly

2014-10-09 22:25:50 -04:00

vmacache.c

mm,vmacache: optimize overflow system-wide flushing

2014-06-04 16:53:57 -07:00

vmalloc.c

mm/vmalloc.c: use seq_open_private() instead of seq_open()

2014-10-09 22:25:56 -04:00

vmpressure.c

mm/vmpressure.c: fix race in vmpressure_work_fn()

2014-12-02 17:32:07 -08:00

vmscan.c

mm: memcontrol: fix transparent huge page allocations under pressure

2014-10-09 22:25:59 -04:00

vmstat.c

vmstat: on-demand vmstat workers V8

2014-10-09 22:26:02 -04:00

workingset.c

mm: keep page cache radix tree nodes in check

2014-04-03 16:21:01 -07:00

zbud.c

zbud: avoid accessing last unused freelist

2014-10-09 22:26:03 -04:00

zpool.c

mm/zpool: use prefixed module loading

2014-08-29 16:28:16 -07:00

zsmalloc.c

zsmalloc: simplify init_zspage free obj linking

2014-10-09 22:26:03 -04:00

zswap.c

mm/zswap.c: add __init to zswap_entry_cache_destroy()

2014-08-08 15:57:18 -07:00