Aneesh Kumar K.V 69e044dd75 powerpc: Fix possible deadlock on page fault ...

stack_grow_into/14082 is trying to acquire lock:
  (&mm->mmap_sem){++++++}, at: [<c000000000206d28>] .might_fault+0x78/0xe0

 but task is already holding lock:
  (&mm->mmap_sem){++++++}, at: [<c0000000007ffd8c>] .do_page_fault+0x24c/0x910

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(&mm->mmap_sem);
   lock(&mm->mmap_sem);

  *** DEADLOCK ***

  May be due to missing lock nesting notation

 1 lock held by stack_grow_into/14082:
  #0:  (&mm->mmap_sem){++++++}, at: [<c0000000007ffd8c>] .do_page_fault+0x24c/0x910

 stack backtrace:
 CPU: 21 PID: 14082 Comm: stack_grow_into Not tainted 3.10.0-10.el7.ppc64.debug #1
 Call Trace:
 [c0000003d396b850] [c000000000016e7c] .show_stack+0x7c/0x1f0 (unreliable)
 [c0000003d396b920] [c000000000813fc8] .dump_stack+0x28/0x3c
 [c0000003d396b990] [c000000000124b90] .__lock_acquire+0x1640/0x1800
 [c0000003d396bab0] [c00000000012570c] .lock_acquire+0xac/0x250
 [c0000003d396bb80] [c000000000206d54] .might_fault+0xa4/0xe0
 [c0000003d396bbf0] [c0000000007ffe2c] .do_page_fault+0x2ec/0x910
 [c0000003d396be30] [c0000000000092e8] handle_page_fault+0x10/0x30

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2013-09-11 11:39:37 +10:00

..

40x_mmu.c

memblock: Remove rmo_size, burry it in arch/powerpc where it belongs

2010-08-05 12:56:08 +10:00

44x_mmu.c

powerpc: Delete __cpuinit usage from all users

2013-07-01 11:10:36 +10:00

dma-noncoherent.c

powerpc: remove the second argument of k[un]map_atomic()

2012-03-20 21:48:14 +08:00

fault.c

powerpc: Fix possible deadlock on page fault

2013-09-11 11:39:37 +10:00

fsl_booke_mmu.c

powerpc/fsl-booke: Fixup calc_cam_sz to support MMU v2

2012-03-15 12:12:19 -05:00

gup.c

powerpc: Implement __get_user_pages_fast()

2013-08-14 14:57:14 +10:00

hash_low_32.S

powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly

2012-07-11 14:18:22 +10:00

hash_low_64.S

powerpc/mm: handle hugepage size correctly when invalidating hpte entries

2013-06-21 16:01:52 +10:00

hash_native_64.c

powerpc/mm: Use the correct SLB(LLP) encoding in tlbie instruction

2013-07-24 14:42:24 +10:00

hash_utils_64.c

powerpc: Fix a number of sparse warnings

2013-08-14 11:50:24 +10:00

highmem.c

mm: fix race in kunmap_atomic()

2010-10-27 18:03:05 -07:00

hugepage-hash64.c

powerpc: Make linux pagetable walk safe with THP enabled

2013-06-21 16:01:56 +10:00

hugetlbpage-book3e.c

powerpc/book3e: Change hugetlb preload to take vma argument

2011-12-07 16:26:24 +11:00

hugetlbpage-hash64.c

powerpc/mm: handle hugepage size correctly when invalidating hpte entries

2013-06-21 16:01:52 +10:00

hugetlbpage.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2013-07-04 10:29:23 -07:00

icswx_pid.c

powerpc: Split ICSWX ACOP and PID processing

2011-11-25 14:11:27 +11:00

icswx.c

powerpc: Fix typo "CONFIG_ICSWX_PID"

2013-04-18 13:03:54 +10:00

icswx.h

powerpc/icswx: Fix race condition with IPI setting ACOP

2012-03-07 17:06:09 +11:00

init_32.c

ppc: init_32: Fix error typo "CONFIG_START_KERNEL"

2013-08-20 13:07:31 +02:00

init_64.c

powerpc/THP: Double the PMD table size for THP

2013-06-21 16:01:53 +10:00

Makefile

powerpc/THP: Add code to handle HPTE faults for hugepages

2013-06-21 16:01:56 +10:00

mem.c

powerpc/mm: Mark Memory Resources as busy

2013-08-27 14:35:11 +10:00

mmap.c

mm: remove free_area_cache

2013-07-10 18:11:34 -07:00

mmu_context_hash32.c

powerpc: include export.h for files using EXPORT_SYMBOL/THIS_MODULE

2011-10-31 19:30:38 -04:00

mmu_context_hash64.c

powerpc: Reduce PTE table memory wastage

2013-04-30 16:00:07 +10:00

mmu_context_nohash.c

powerpc: Delete __cpuinit usage from all users

2013-07-01 11:10:36 +10:00

mmu_decl.h

powerpc/fsl-booke: Fix setup_initial_memory_limit to not blindly map

2011-10-11 23:30:41 -05:00

numa.c

powerpc: Make NUMA device node code endian safe

2013-08-14 15:33:33 +10:00

pgtable_32.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

pgtable_64.c

powerpc: Optimize hugepage invalidate

2013-06-21 16:01:58 +10:00

pgtable.c

powerpc: disable assert_pte_locked for collapse_huge_page

2013-06-21 16:01:57 +10:00

ppc_mmu_32.c

memblock: Remove rmo_size, burry it in arch/powerpc where it belongs

2010-08-05 12:56:08 +10:00

slb_low.S

powerpc: Rename USER_ESID_BITS* to ESID_BITS*

2013-03-17 12:45:44 +11:00

slb.c

powerpc: Fix little endian lppaca, slb_shadow and dtl_entry

2013-08-14 15:33:35 +10:00

slice.c

mm: use vm_unmapped_area() on powerpc architecture

2013-04-30 11:05:17 +10:00

stab.c

powerpc/mm: Remove uses of abs_to_virt() and virt_to_abs()

2012-09-05 15:19:31 +10:00

subpage-prot.c

powerpc: Fix a number of sparse warnings

2013-08-14 11:50:24 +10:00

tlb_hash32.c

powerpc: include export.h for files using EXPORT_SYMBOL/THIS_MODULE

2011-10-31 19:30:38 -04:00

tlb_hash64.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2013-07-04 10:29:23 -07:00

tlb_low_64e.S

powerpc/booke64: Use SPRG0/3 scratch for bolted TLB miss & crit int

2012-09-05 15:35:52 +10:00

tlb_nohash_low.S

powerpc/47x: Use the new ppc-opcode infrastructure

2012-11-15 12:59:24 +11:00

tlb_nohash.c

powerpc: Delete __cpuinit usage from all users

2013-07-01 11:10:36 +10:00