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Steven Miao e020d5bd8a mm: nommu: per-thread vma cache fix 
mm could be removed from current task struct, using previous vma->vm_mm

It will crash on blackfin after updated to Linux 3.15.  The commit "mm:
per-thread vma caching" caused the crash.  mm could be removed from
current task struct before

  mmput()->
    exit_mmap()->
      delete_vma_from_mm()

the detailed fault information:

    NULL pointer access
    Kernel OOPS in progress
    Deferred Exception context
    CURRENT PROCESS:
    COMM=modprobe PID=278  CPU=0
    invalid mm
    return address: [0x000531de]; contents of:
    0x000531b0:  c727  acea  0c42  181d  0000  0000  0000  a0a8
    0x000531c0:  b090  acaa  0c42  1806  0000  0000  0000  a0e8
    0x000531d0:  b0d0  e801  0000  05b3  0010  e522  0046 [a090]
    0x000531e0:  6408  b090  0c00  17cc  3042  e3ff  f37b  2fc8

    CPU: 0 PID: 278 Comm: modprobe Not tainted 3.15.0-ADI-2014R1-pre-00345-gea9f446 #25
    task: 0572b720 ti: 0569e000 task.ti: 0569e000
    Compiled for cpu family 0x27fe (Rev 0), but running on:0x0000 (Rev 0)
    ADSP-BF609-0.0 500(MHz CCLK) 125(MHz SCLK) (mpu off)
    Linux version 3.15.0-ADI-2014R1-pre-00345-gea9f446 (steven@steven-OptiPlex-390) (gcc version 4.3.5 (ADI-trunk/svn-5962) ) #25 Tue Jun 10 17:47:46 CST 2014

    SEQUENCER STATUS:		Not tainted
     SEQSTAT: 00000027  IPEND: 8008  IMASK: ffff  SYSCFG: 2806
      EXCAUSE   : 0x27
      physical IVG3 asserted : <0xffa00744> { _trap + 0x0 }
      physical IVG15 asserted : <0xffa00d68> { _evt_system_call + 0x0 }
      logical irq   6 mapped  : <0xffa003bc> { _bfin_coretmr_interrupt + 0x0 }
      logical irq   7 mapped  : <0x00008828> { _bfin_fault_routine + 0x0 }
      logical irq  11 mapped  : <0x00007724> { _l2_ecc_err + 0x0 }
      logical irq  13 mapped  : <0x00008828> { _bfin_fault_routine + 0x0 }
      logical irq  39 mapped  : <0x00150788> { _bfin_twi_interrupt_entry + 0x0 }
      logical irq  40 mapped  : <0x00150788> { _bfin_twi_interrupt_entry + 0x0 }
     RETE: <0x00000000> /* Maybe null pointer? */
     RETN: <0x0569fe50> /* kernel dynamic memory (maybe user-space) */
     RETX: <0x00000480> /* Maybe fixed code section */
     RETS: <0x00053384> { _exit_mmap + 0x28 }
     PC  : <0x000531de> { _delete_vma_from_mm + 0x92 }
    DCPLB_FAULT_ADDR: <0x00000008> /* Maybe null pointer? */
    ICPLB_FAULT_ADDR: <0x000531de> { _delete_vma_from_mm + 0x92 }
    PROCESSOR STATE:
     R0 : 00000004    R1 : 0569e000    R2 : 00bf3db4    R3 : 00000000
     R4 : 057f9800    R5 : 00000001    R6 : 0569ddd0    R7 : 0572b720
     P0 : 0572b854    P1 : 00000004    P2 : 00000000    P3 : 0569dda0
     P4 : 0572b720    P5 : 0566c368    FP : 0569fe5c    SP : 0569fd74
     LB0: 057f523f    LT0: 057f523e    LC0: 00000000
     LB1: 0005317c    LT1: 00053172    LC1: 00000002
     B0 : 00000000    L0 : 00000000    M0 : 0566f5bc    I0 : 00000000
     B1 : 00000000    L1 : 00000000    M1 : 00000000    I1 : ffffffff
     B2 : 00000001    L2 : 00000000    M2 : 00000000    I2 : 00000000
     B3 : 00000000    L3 : 00000000    M3 : 00000000    I3 : 057f8000
    A0.w: 00000000   A0.x: 00000000   A1.w: 00000000   A1.x: 00000000
    USP : 056ffcf8  ASTAT: 02003024

    Hardware Trace:
       0 Target : <0x00003fb8> { _trap_c + 0x0 }
         Source : <0xffa006d8> { _exception_to_level5 + 0xa0 } JUMP.L
       1 Target : <0xffa00638> { _exception_to_level5 + 0x0 }
         Source : <0xffa004f2> { _bfin_return_from_exception + 0x6 } RTX
       2 Target : <0xffa004ec> { _bfin_return_from_exception + 0x0 }
         Source : <0xffa00590> { _ex_trap_c + 0x70 } JUMP.S
       3 Target : <0xffa00520> { _ex_trap_c + 0x0 }
         Source : <0xffa0076e> { _trap + 0x2a } JUMP (P4)
       4 Target : <0xffa00744> { _trap + 0x0 }
          FAULT : <0x000531de> { _delete_vma_from_mm + 0x92 } P0 = W[P2 + 2]
         Source : <0x000531da> { _delete_vma_from_mm + 0x8e } P2 = [P4 + 0x18]
       5 Target : <0x000531da> { _delete_vma_from_mm + 0x8e }
         Source : <0x00053176> { _delete_vma_from_mm + 0x2a } IF CC JUMP pcrel
       6 Target : <0x0005314c> { _delete_vma_from_mm + 0x0 }
         Source : <0x00053380> { _exit_mmap + 0x24 } JUMP.L
       7 Target : <0x00053378> { _exit_mmap + 0x1c }
         Source : <0x00053394> { _exit_mmap + 0x38 } IF !CC JUMP pcrel (BP)
       8 Target : <0x00053390> { _exit_mmap + 0x34 }
         Source : <0xffa020e0> { __cond_resched + 0x20 } RTS
       9 Target : <0xffa020c0> { __cond_resched + 0x0 }
         Source : <0x0005338c> { _exit_mmap + 0x30 } JUMP.L
      10 Target : <0x0005338c> { _exit_mmap + 0x30 }
         Source : <0x0005333a> { _delete_vma + 0xb2 } RTS
      11 Target : <0x00053334> { _delete_vma + 0xac }
         Source : <0x0005507a> { _kmem_cache_free + 0xba } RTS
      12 Target : <0x00055068> { _kmem_cache_free + 0xa8 }
         Source : <0x0005505e> { _kmem_cache_free + 0x9e } IF !CC JUMP pcrel (BP)
      13 Target : <0x00055052> { _kmem_cache_free + 0x92 }
         Source : <0x0005501a> { _kmem_cache_free + 0x5a } IF CC JUMP pcrel
      14 Target : <0x00054ff4> { _kmem_cache_free + 0x34 }
         Source : <0x00054fce> { _kmem_cache_free + 0xe } IF CC JUMP pcrel (BP)
      15 Target : <0x00054fc0> { _kmem_cache_free + 0x0 }
         Source : <0x00053330> { _delete_vma + 0xa8 } JUMP.L
    Kernel Stack
    Stack info:
     SP: [0x0569ff24] <0x0569ff24> /* kernel dynamic memory (maybe user-space) */
     Memory from 0x0569ff20 to 056a0000
    0569ff20: 00000001 [04e8da5a] 00008000  00000000  00000000  056a0000  04e8da5a  04e8da5a
    0569ff40: 04eb9eea  ffa00dce  02003025  04ea09c5  057f523f  04ea09c4  057f523e  00000000
    0569ff60: 00000000  00000000  00000000  00000000  00000000  00000000  00000001  00000000
    0569ff80: 00000000  00000000  00000000  00000000  00000000  00000000  00000000  00000000
    0569ffa0: 0566f5bc  057f8000  057f8000  00000001  04ec0170  056ffcf8  056ffd04  057f9800
    0569ffc0: 04d1d498  057f9800  057f8fe4  057f8ef0  00000001  057f928c  00000001  00000001
    0569ffe0: 057f9800  00000000  00000008  00000007  00000001  00000001  00000001 <00002806>
    Return addresses in stack:
        address : <0x00002806> { _show_cpuinfo + 0x2d2 }
    Modules linked in:
    Kernel panic - not syncing: Kernel exception
    [ end Kernel panic - not syncing: Kernel exception

Signed-off-by: Steven Miao <realmz6@gmail.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org>	[3.15.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-23 16:47:43 -07:00
..
backing-dev.c arch: Mass conversion of smp_mb__*() 2014-04-18 14:20:48 +02:00
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
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, compaction: properly signal and act upon lock and need_sched() contention 2014-06-04 16:54:11 -07:00
debug-pagealloc.c
dmapool.c mm/dmapool.c: reuse devres_release() to free resources 2014-06-04 16:54:08 -07:00
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.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
filemap_xip.c seqcount: Add lockdep functionality to seqcount/seqlock structures 2013-11-06 12:40:26 +01:00
fremap.c mm: mark remap_file_pages() syscall as deprecated 2014-06-06 16:08:17 -07:00
frontswap.c swap: change swap_list_head to plist, add swap_avail_head 2014-06-04 16:54:07 -07:00
gup.c mm: cleanup __get_user_pages() 2014-06-04 16:54:05 -07:00
highmem.c
huge_memory.c mm/huge_memory.c: complete conversion to pr_foo() 2014-06-04 16:53:58 -07:00
hugetlb.c hugetlb: rename hugepage_migration_support() to ..._supported() 2014-06-04 16:54:12 -07:00
hugetlb_cgroup.c cgroup: remove css_parent() 2014-05-16 13:22:48 -04:00
hwpoison-inject.c mm/hwpoison: add '#' to hwpoison_inject 2014-01-21 16:19:48 -08:00
init-mm.c
internal.h mm, compaction: properly signal and act upon lock and need_sched() contention 2014-06-04 16:54:11 -07:00
interval_tree.c
iov_iter.c bio_vec-backed iov_iter 2014-05-06 17:39:45 -04:00
Kconfig mm/zsmalloc: make zsmalloc module-buildable 2014-06-04 16:54:14 -07:00
Kconfig.debug
kmemcheck.c
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: close PageTail race 2014-03-04 07:55:47 -08:00
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: madvise: fix MADV_WILLNEED on shmem swapouts 2014-05-23 09:37:29 -07:00
Makefile mm: move get_user_pages()-related code to separate file 2014-06-04 16:54:04 -07:00
memblock.c mm/memblock.c: call kmemleak directly from memblock_(alloc|free) 2014-06-06 16:08:17 -07:00
memcontrol.c Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2014-06-09 15:03:33 -07:00
memory-failure.c mm/memory-failure.c: support use of a dedicated thread to handle SIGBUS(BUS_MCEERR_AO) 2014-06-04 16:54:13 -07:00
memory.c mm: document do_fault_around() feature 2014-06-04 16:54:12 -07:00
memory_hotplug.c mm, migration: add destination page freeing callback 2014-06-04 16:54:06 -07:00
mempolicy.c Merge branch 'next' (accumulated 3.16 merge window patches) into master 2014-06-08 11:31:16 -07:00
mempool.c mm/mempool.c: update the kmemleak stack trace for mempool allocations 2014-06-06 16:08:17 -07:00
migrate.c hugetlb: rename hugepage_migration_support() to ..._supported() 2014-06-04 16:54:12 -07:00
mincore.c mm + fs: prepare for non-page entries in page cache radix trees 2014-04-03 16:21:00 -07:00
mlock.c mm: try_to_unmap_cluster() should lock_page() before mlocking 2014-04-07 16:35:57 -07:00
mm_init.c mm: bring back /sys/kernel/mm 2014-01-27 21:02:39 -08:00
mmap.c mm: convert some level-less printks to pr_* 2014-06-06 16:08:18 -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 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: move mmu notifier call from change_protection to change_pmd_range 2014-04-07 16:35:50 -07:00
mremap.c mm, thp: close race between mremap() and split_huge_page() 2014-05-11 17:55:48 +09:00
msync.c mm/msync.c: sync only the requested range in msync() 2014-06-04 16:54:11 -07:00
nobootmem.c mm/memblock.c: call kmemleak directly from memblock_(alloc|free) 2014-06-06 16:08:17 -07:00
nommu.c mm: nommu: per-thread vma cache fix 2014-06-23 16:47:43 -07:00
oom_kill.c mm, oom: base root bonus on current usage 2014-01-30 16:56:56 -08:00
page-writeback.c Clean ups and miscellaneous bug fixes, in particular for the new 2014-06-08 13:03:35 -07:00
page_alloc.c mm: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:16 -07:00
page_cgroup.c mm/page_cgroup.c: mark functions as static 2014-04-03 16:21:02 -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: memory-hotplug: enable memory hotplug to handle hugepage 2013-09-11 15:57:48 -07:00
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
percpu.c percpu: make pcpu_alloc_chunk() use pcpu_mem_free() instead of kfree() 2014-04-14 16:18:06 -04:00
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 start adding the tag to iov_iter 2014-05-06 17:32:49 -04:00
quicklist.c
readahead.c mm/readahead.c: inline ra_submit 2014-04-07 16:35:58 -07:00
rmap.c Merge branch 'next' (accumulated 3.16 merge window patches) into master 2014-06-08 11:31:16 -07:00
shmem.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
slab.c memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab 2014-06-04 16:54:01 -07:00
slab.h memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab 2014-06-04 16:54:01 -07:00
slab_common.c slab: delete cache from list after __kmem_cache_shutdown succeeds 2014-06-04 16:54:08 -07:00
slob.c slab: get_online_mems for kmem_cache_{create,destroy,shrink} 2014-06-04 16:53:59 -07:00
slub.c slub: search partial list on numa_mem_id(), instead of numa_node_id() 2014-06-06 16:08:06 -07:00
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.c mm: non-atomically mark page accessed during page cache allocation where possible 2014-06-04 16:54:10 -07:00
swap_state.c mm: page_alloc: convert hot/cold parameter and immediate callers to bool 2014-06-04 16:54:09 -07:00
swapfile.c mm/swapfile.c: delete the "last_in_cluster < scan_base" loop in the body of scan_swap_map() 2014-06-04 16:54:12 -07:00
truncate.c mm: filemap: update find_get_pages_tag() to deal with shadow entries 2014-05-06 13:04:59 -07:00
util.c nick kvfree() from apparmor 2014-05-06 14:02:53 -04:00
vmacache.c mm,vmacache: optimize overflow system-wide flushing 2014-06-04 16:53:57 -07:00
vmalloc.c mm/vmalloc.c: export unmap_kernel_range() 2014-06-04 16:54:14 -07:00
vmpressure.c arm, pm, vmpressure: add missing slab.h includes 2014-02-03 13:24:01 -05:00
vmscan.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
vmstat.c mm: use the light version __mod_zone_page_state in mlocked_vma_newpage() 2014-06-04 16:54:07 -07:00
workingset.c mm: keep page cache radix tree nodes in check 2014-04-03 16:21:01 -07:00
zbud.c mm/zbud.c: make size unsigned like unique callsite 2014-06-04 16:54:13 -07:00
zsmalloc.c zsmalloc: fixup trivial zs size classes value in comments 2014-06-04 16:54:13 -07:00
zswap.c mm/zswap: NUMA aware allocation for zswap_dstmem 2014-06-04 16:54:14 -07:00