Hugh Dickins f9aed62a2b mm: change nr_ptes BUG_ON to WARN_ON ...

Occasionally an isolated BUG_ON(mm->nr_ptes) gets reported, indicating
that not all the page tables allocated could be found and freed when
exit_mmap() tore down the user address space.

There's usually nothing we can say about it, beyond that it's probably a
sign of some bad memory or memory corruption; though it might still
indicate a bug in vma or page table management (and did recently reveal a
race in THP, fixed a few months ago).

But one overdue change we can make is from BUG_ON to WARN_ON.

It's fairly likely that the system will crash shortly afterwards in some
other way (for example, the BUG_ON(page_mapped(page)) in
__delete_from_page_cache(), once an inode mapped into the lost page tables
gets evicted); but might tell us more before that.

Change the BUG_ON(page_mapped) to WARN_ON too?  Later perhaps: I'm less
eager, since that one has several times led to fixes.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-08-21 16:45:02 -07:00

..

backing-dev.c

vfs: kill write_super and sync_supers

2012-08-04 01:24:44 +04:00

bootmem.c

bootmem: make ___alloc_bootmem_node_nopanic() really nopanic

2012-07-17 16:21:29 -07:00

bounce.c

bounce: allow use of bounce pool via config option

2012-07-18 16:40:35 -04:00

cleancache.c

->encode_fh() API change

2012-05-29 23:28:33 -04:00

compaction.c

mm: have order > 0 compaction start off where it left

2012-07-31 18:42:43 -07:00

debug-pagealloc.c

mm, x86: Remove debug_pagealloc_enabled

2011-12-06 09:24:07 +01:00

dmapool.c

mm: fix implicit stat.h usage in dmapool.c

2011-10-31 09:20:12 -04:00

fadvise.c

mm, fadvise: don't return -EINVAL when filesystem cannot implement fadvise()

2012-07-31 18:42:42 -07:00

failslab.c

switch debugfs to umode_t

2012-01-03 22:54:56 -05:00

filemap_xip.c

fs: Protect write paths by sb_start_write - sb_end_write

2012-07-31 09:45:47 +04:00

filemap.c

fs: Protect write paths by sb_start_write - sb_end_write

2012-07-31 09:45:47 +04:00

fremap.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

frontswap.c

mm/frontswap: cleanup doc and comment error

2012-07-23 11:16:20 -04:00

highmem.c

mm: add support for direct_IO to highmem pages

2012-07-31 18:42:47 -07:00

huge_memory.c

mm/memcg: apply add/del_page to lruvec

2012-05-29 16:22:28 -07:00

hugetlb_cgroup.c

hugetlb/cgroup: remove exclude and wakeup rmdir calls from migrate

2012-07-31 18:42:41 -07:00

hugetlb.c

mm: hugetlbfs: close race during teardown of hugetlbfs shared page tables

2012-07-31 18:42:50 -07:00

hwpoison-inject.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

init-mm.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

internal.h

netvm: allow skb allocation to use PFMEMALLOC reserves

2012-07-31 18:42:46 -07:00

Kconfig

mm: factor out memory isolate functions

2012-07-31 18:42:45 -07:00

Kconfig.debug

mm: more intensive memory corruption debugging

2012-01-10 16:30:42 -08:00

kmemcheck.c

…

kmemleak-test.c

kmemleak: remove memset by using kzalloc

2011-01-27 18:31:51 +00:00

kmemleak.c

kmemleak: Disable early logging when kmemleak is off by default

2012-01-20 16:57:05 +00:00

ksm.c

ksm: cleanup: introduce find_mergeable_vma()

2012-03-21 17:54:59 -07:00

maccess.c

mm: Map most files to use export.h instead of module.h

2011-10-31 09:20:12 -04:00

madvise.c

mm: Hold a file reference in madvise_remove

2012-07-06 10:34:38 -07:00

Makefile

mm: factor out memory isolate functions

2012-07-31 18:42:45 -07:00

memblock.c

mm/memblock.c:memblock_double_array(): cosmetic cleanups

2012-07-31 18:42:41 -07:00

memcontrol.c

memcg: add mem_cgroup_from_css() helper

2012-07-31 18:42:49 -07:00

memory_hotplug.c

mm/hotplug: free zone->pageset when a zone becomes empty

2012-07-31 18:42:44 -07:00

memory-failure.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

memory.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-08-01 10:26:23 -07:00

mempolicy.c

Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux

2012-07-30 11:32:24 -07:00

mempool.c

mempool: add @gfp_mask to mempool_create_node()

2012-06-25 11:53:47 +02:00

migrate.c

mm: memcg: fix compaction/migration failing due to memcg limits

2012-07-31 18:42:48 -07:00

mincore.c

mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode

2012-03-21 17:54:54 -07:00

mlock.c

vm: avoid using find_vma_prev() unnecessarily

2012-03-06 18:23:36 -08:00

mm_init.c

mm: Map most files to use export.h instead of module.h

2011-10-31 09:20:12 -04:00

mmap.c

mm: change nr_ptes BUG_ON to WARN_ON

2012-08-21 16:45:02 -07:00

mmu_context.c

mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()

2012-03-21 17:54:59 -07:00

mmu_notifier.c

mm: mmu_notifier: fix freed page still mapped in secondary MMU

2012-07-31 18:42:49 -07:00

mmzone.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

mprotect.c

Merge branch 'akpm' (Andrew's patch-bomb)

2012-03-22 09:04:48 -07:00

mremap.c

mm: account the total_vm in the vm_stat_account()

2012-07-31 18:42:39 -07:00

msync.c

…

nobootmem.c

memblock: free allocated memblock_reserved_regions later

2012-07-11 16:04:50 -07:00

nommu.c

nommu: fix compilation of nommu.c

2012-06-04 17:17:31 -04:00

oom_kill.c

mm, memcg: move all oom handling to memcontrol.c

2012-07-31 18:42:45 -07:00

page_alloc.c

mm: remove node_start_pfn checking in new WARN_ON for now

2012-08-02 10:37:03 -07:00

page_cgroup.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

page_io.c

mm: add support for direct_IO to highmem pages

2012-07-31 18:42:47 -07:00

page_isolation.c

memory-hotplug: fix kswapd looping forever problem

2012-07-31 18:42:45 -07:00

page-writeback.c

vfs: kill write_super and sync_supers

2012-08-04 01:24:44 +04:00

pagewalk.c

mm: fix kernel-doc warnings

2012-06-20 14:39:36 -07:00

percpu-km.c

percpu: clear memory allocated with the km allocator

2010-10-02 10:28:42 +03:00

percpu-vm.c

mm: fix kernel-doc warnings

2012-06-20 14:39:36 -07:00

percpu.c

kmemleak: Fix the kmemleak tracking of the percpu areas with !SMP

2012-05-09 10:13:29 -07:00

pgtable-generic.c

arch/tile: allow building Linux with transparent huge pages enabled

2012-05-25 12:48:21 -04:00

prio_tree.c

sanitize <linux/prefetch.h> usage

2011-05-20 12:50:29 -07:00

process_vm_access.c

aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector()

2012-05-31 17:49:32 -07:00

quicklist.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

readahead.c

mm: move readahead syscall to mm/readahead.c

2012-05-29 16:22:23 -07:00

rmap.c

mm: remove swap token code

2012-05-29 16:22:19 -07:00

shmem.c

tmpfs: distribute interleave better across nodes

2012-07-31 18:42:50 -07:00

slab_common.c

mm: Fix build warning in kmem_cache_create()

2012-07-30 13:15:40 +03:00

slab.c

mm: micro-optimise slab to avoid a function call

2012-07-31 18:42:46 -07:00

slab.h

mm, sl[aou]b: Use a common mutex definition

2012-07-09 12:13:41 +03:00

slob.c

slob: Fix early boot kernel crash

2012-07-12 10:13:22 +03:00

slub.c

mm: slub: optimise the SLUB fast path to avoid pfmemalloc checks

2012-07-31 18:42:45 -07:00

sparse-vmemmap.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

sparse.c

mm/sparse: remove index_init_lock

2012-07-31 18:42:49 -07:00

swap_state.c

mm: add support for a filesystem to activate swap files and use direct_IO for writing swap pages

2012-07-31 18:42:47 -07:00

swap.c

mm: add support for direct_IO to highmem pages

2012-07-31 18:42:47 -07:00

swapfile.c

mm: swapfile: clean up unuse_pte race handling

2012-07-31 18:42:48 -07:00

truncate.c

mm/fs: remove truncate_range

2012-05-29 16:22:23 -07:00

util.c

new helper: vm_mmap_pgoff()

2012-06-01 10:37:18 -04:00

vmalloc.c

mm: make vb_alloc() more foolproof

2012-07-31 18:42:39 -07:00

vmscan.c

memcg: gix memory accounting scalability in shrink_page_list

2012-07-31 18:42:49 -07:00

vmstat.c

mm: account for the number of times direct reclaimers get throttled

2012-07-31 18:42:46 -07:00