Oleg Nesterov d003f371b2 oom: don't assume that a coredumping thread will exit soon ... oom_kill.c assumes that PF_EXITING task should exit and free the memory soon. This is wrong in many ways and one important case is the coredump. A task can sleep in exit_mm() "forever" while the coredumping sub-thread can need more memory. Change the PF_EXITING checks to take SIGNAL_GROUP_COREDUMP into account, we add the new trivial helper for that. Note: this is only the first step, this patch doesn't try to solve other problems. The SIGNAL_GROUP_COREDUMP check is obviously racy, a task can participate in coredump after it was already observed in PF_EXITING state, so TIF_MEMDIE (which also blocks oom-killer) still can be wrongly set. fatal_signal_pending() can be true because of SIGNAL_GROUP_COREDUMP so out_of_memory() and mem_cgroup_out_of_memory() shouldn't blindly trust it. And even the name/usage of the new helper is confusing, an exiting thread can only free its ->mm if it is the only/last task in thread group. [akpm@linux-foundation.org: add comment] Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-12-13 12:42:49 -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
cma.c	mm: cma: align to physical address, not CMA region position	2014-12-13 12:42:46 -08:00
compaction.c	mm, compaction: more focused lru and pcplists draining	2014-12-10 17:41:06 -08:00
debug-pagealloc.c	mm/debug-pagealloc: make debug-pagealloc boottime configurable	2014-12-13 12:42:48 -08:00
debug.c	mm: move page->mem_cgroup bad page handling into generic code	2014-12-10 17:41:09 -08:00
dmapool.c	mm/dmapool.c: fixed a brace coding style issue	2014-10-09 22:26:00 -04:00
early_ioremap.c
fadvise.c
failslab.c
filemap.c	mm: convert i_mmap_mutex to rwsem	2014-12-13 12:42:45 -08:00
filemap_xip.c	mm/xip: share the i_mmap_rwsem	2014-12-13 12:42:45 -08:00
fremap.c	mm: use new helper functions around the i_mmap_mutex	2014-12-13 12:42:45 -08:00
frontswap.c	mm/frontswap.c: fix the condition in BUG_ON	2014-12-10 17:41:08 -08:00
gup.c	mm: Update generic gup implementation to handle hugepage directory	2014-11-14 17:24:21 +11:00
highmem.c
huge_memory.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2014-12-11 17:30:55 -08:00
hugetlb.c	hugetlb: hugetlb_register_all_nodes(): add __init marker	2014-12-13 12:42:47 -08:00
hugetlb_cgroup.c	mm: hugetlb_cgroup: convert to lockless page counters	2014-12-10 17:41:04 -08:00
hwpoison-inject.c
init-mm.c
internal.h	mm, compaction: always update cached scanner positions	2014-12-10 17:41:06 -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	copy_from_iter_nocache()	2014-12-08 20:25:23 -05:00
Kconfig	mm/balloon_compaction: add vmstat counters and kpageflags bit	2014-10-09 22:26:01 -04:00
Kconfig.debug	mm/debug-pagealloc: prepare boottime configurable on/off	2014-12-13 12:42:48 -08:00
kmemcheck.c	mm/slab_common: move kmem_cache definition to internal header	2014-10-09 22:25:50 -04:00
kmemleak-test.c
kmemleak.c
ksm.c	mm: ksm use pr_err instead of printk	2014-10-09 22:26:00 -04:00
list_lru.c
maccess.c
madvise.c
Makefile	mm/page_owner: keep track of page owners	2014-12-13 12:42:48 -08:00
memblock.c	mm/memblock.c: refactor functions to set/clear MEMBLOCK_HOTPLUG	2014-12-13 12:42:46 -08:00
memcontrol.c	oom: don't assume that a coredumping thread will exit soon	2014-12-13 12:42:49 -08:00
memory-failure.c	mm: vmscan: invoke slab shrinkers from shrink_zone()	2014-12-13 12:42:48 -08:00
memory.c	mm: export find_extend_vma() and handle_mm_fault() for driver use	2014-12-13 12:42:47 -08:00
memory_hotplug.c	mm, memory_hotplug/failure: drain single zone pcplists	2014-12-10 17:41:05 -08:00
mempolicy.c	mm: mempolicy: skip inaccessible VMAs when setting MPOL_MF_LAZY	2014-10-09 22:26:02 -04:00
mempool.c
migrate.c	mm: unmapped page migration avoid unmap+remap overhead	2014-12-13 12:42:49 -08:00
mincore.c	mm: mincore: add hwpoison page handle	2014-12-13 12:42:46 -08:00
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
mmap.c	mm: export find_extend_vma() and handle_mm_fault() for driver use	2014-12-13 12:42:47 -08:00
mmu_context.c
mmu_notifier.c	kvm: Fix page ageing bugs	2014-09-24 14:07:58 +02:00
mmzone.c
mprotect.c	mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared	2014-10-14 02:18:28 +02:00
mremap.c	mm: convert i_mmap_mutex to rwsem	2014-12-13 12:42:45 -08:00
msync.c
nobootmem.c	mem-hotplug: reset node managed pages when hot-adding a new pgdat	2014-11-13 16:17:06 -08:00
nommu.c	mm/nommu: use alloc_pages_exact() rather than its own implementation	2014-12-13 12:42:48 -08:00
oom_kill.c	oom: don't assume that a coredumping thread will exit soon	2014-12-13 12:42:49 -08:00
page-writeback.c	mm, memcg: fix potential undefined behaviour in page stat accounting	2014-12-10 17:41:08 -08:00
page_alloc.c	mm: remove the highmem zones' memmap in the highmem zone	2014-12-13 12:42:49 -08:00
page_counter.c	mm: memcontrol: remove obsolete kmemcg pinning tricks	2014-12-10 17:41:05 -08:00
page_ext.c	mm/page_owner: keep track of page owners	2014-12-13 12:42:48 -08:00
page_io.c
page_isolation.c	mm, page_isolation: drain single zone pcplists	2014-12-10 17:41:05 -08:00
page_owner.c	mm/page_owner: correct owner information for early allocated pages	2014-12-13 12:42:48 -08:00
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: off by one in BUG_ON()	2014-10-29 10:34:34 -04:00
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c	mm/rmap: calculate page offset when needed	2014-12-13 12:42:46 -08:00
shmem.c	shmem: support RENAME_WHITEOUT	2014-10-24 00:14:37 +02:00
slab.c	Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-12-11 18:57:19 -08:00
slab.h	memcg: use generic slab iterators for showing slabinfo	2014-12-10 17:41:07 -08:00
slab_common.c	memcg: use generic slab iterators for showing slabinfo	2014-12-10 17:41:07 -08:00
slob.c	mm/sl[ao]b: always track caller in kmalloc_(node_)track_caller()	2014-10-09 22:25:50 -04:00
slub.c	Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-12-11 18:57:19 -08:00
sparse-vmemmap.c
sparse.c
swap.c	mm: memcontrol: do not kill uncharge batching in free_pages_and_swap_cache	2014-10-09 22:25:59 -04:00
swap_cgroup.c	mm: page_cgroup: rename file to mm/swap_cgroup.c	2014-12-10 17:41:09 -08:00
swap_state.c	mm: page_cgroup: rename file to mm/swap_cgroup.c	2014-12-10 17:41:09 -08:00
swapfile.c	mm: page_cgroup: rename file to mm/swap_cgroup.c	2014-12-10 17:41:09 -08:00
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: count number of system-wide flushes	2014-12-13 12:42:48 -08:00
vmalloc.c	mm/vmalloc.c: replace printk with pr_warn	2014-12-10 17:41:05 -08:00
vmpressure.c	mm/vmpressure.c: fix race in vmpressure_work_fn()	2014-12-02 17:32:07 -08:00
vmscan.c	mm: vmscan: invoke slab shrinkers from shrink_zone()	2014-12-13 12:42:48 -08:00
vmstat.c	mm,vmacache: count number of system-wide flushes	2014-12-13 12:42:48 -08:00
workingset.c
zbud.c	Merge Linus' tree to be be to apply submitted patches to newer code than	2014-11-20 14:42:02 +01:00
zpool.c
zsmalloc.c	zsmalloc: simplify init_zspage free obj linking	2014-10-09 22:26:03 -04:00
zswap.c	Merge Linus' tree to be be to apply submitted patches to newer code than	2014-11-20 14:42:02 +01:00