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Date:	Mon, 16 Nov 2015 11:12:50 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Vitaly Kuznetsov <vkuznets@...hat.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [lkp] [panic] [ BUG: bad unlock balance detected! ]

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 08d78658f393fefaa2e6507ea052c6f8ef4002a2 ("panic: release stale console lock to always get the logbuf printed out")


+------------------------------------------------------------------+------------+------------+
|                                                                  | 7f8306429c | 08d78658f3 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 0          | 2          |
| boot_failures                                                    | 100        | 86         |
| invoked_oom-killer:gfp_mask=0x                                   | 100        | 86         |
| Mem-Info                                                         | 100        | 86         |
| Out_of_memory:Kill_process                                       | 98         | 86         |
| backtrace:vmalloc                                                | 96         | 86         |
| backtrace:init_mtdram                                            | 94         | 84         |
| backtrace:kernel_init_freeable                                   | 100        | 86         |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 80         | 86         |
| backtrace:target_register_template                               | 1          |            |
| backtrace:iscsi_target_init_module                               | 1          |            |
| backtrace:bdi_register                                           | 1          |            |
| backtrace:init_mtd                                               | 1          |            |
| backtrace:init_nandsim                                           | 2          | 2          |
| backtrace:ns_init_module                                         | 2          | 2          |
| backtrace:do_sys_open                                            | 1          |            |
| backtrace:SyS_open                                               | 1          |            |
| backtrace:populate_rootfs                                        | 2          |            |
| backtrace:vfs_write                                              | 1          |            |
| backtrace:SyS_write                                              | 1          |            |
| is_trying_to_release_lock(console_lock)at                        | 0          | 17         |
| backtrace:__pci_register_driver                                  | 0          | 1          |
| backtrace:vr_nor_pci_driver_init                                 | 0          | 1          |
+------------------------------------------------------------------+------------+------------+

The OOM is common between the parent and the child commits, but the "[
BUG: bad unlock balance detected! ]" may be related to the commit.

[   37.291597] slram: not enough parameters.
[   37.293324] Ramix PMC551 PCI Mezzanine Ram Driver. (C) 1999,2000 Nortel Networks.
[   37.297038] pmc551: not detected
[   37.329718] swapper/0 invoked oom-killer: gfp_mask=0x24002c2, order=0, oom_score_adj=0
[   37.333699] swapper/0 cpuset=/ mems_allowed=0
[   37.347987] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-08150-g08d7865 #1
[   37.350728] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   37.354583]  0000000000000000 ffff8800132bbb20 ffffffff8173760d ffff8800132bbcc8
[   37.368842]  ffff8800132bbb90 ffffffff811fb624 ffff8800132bbb40 0000000000000206
[   37.372378]  ffff8800132bbb60 ffffffff82e16747 ffffffff84081da0 0000000000000001
[   37.376098] Call Trace:
[   37.377672]  [<ffffffff8173760d>] dump_stack+0x4b/0x63
[   37.384640]  [<ffffffff811fb624>] dump_header+0x57/0x1f2
[   37.390090]  [<ffffffff82e16747>] ? _raw_spin_unlock_irqrestore+0x4d/0x59
[   37.392707]  [<ffffffff811a89f8>] oom_kill_process+0x8f/0x34b
[   37.407046]  [<ffffffff811a90da>] out_of_memory+0x3d6/0x3f1
[   37.409493]  [<ffffffff811addb5>] __alloc_pages_slowpath+0x62d/0x68d
[   37.412700]  [<ffffffff811adfab>] __alloc_pages_nodemask+0x196/0x2dc
[   37.415088]  [<ffffffff811e5b51>] alloc_page_interleave+0x37/0x7a
[   37.428457]  [<ffffffff811e6193>] alloc_pages_current+0x79/0xe2
[   37.433083]  [<ffffffff811d94fa>] __vmalloc_node_range+0x168/0x22e
[   37.435373]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.437547]  [<ffffffff811d95ee>] __vmalloc_node+0x2e/0x30
[   37.443649]  [<ffffffff8467c898>] ? init_mtdram+0x3c/0xc4
[   37.456796]  [<ffffffff811d9776>] vmalloc+0x2a/0x2c
[   37.467025]  [<ffffffff8467c898>] init_mtdram+0x3c/0xc4
[   37.470180]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.472167]  [<ffffffff81002174>] do_one_initcall+0xe7/0x173
[   37.474194]  [<ffffffff84606131>] kernel_init_freeable+0x1bf/0x24c
[   37.476341]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.493542]  [<ffffffff82e0b147>] kernel_init+0xe/0xd9
[   37.495623]  [<ffffffff82e173df>] ret_from_fork+0x3f/0x70
[   37.497707]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.515849] Mem-Info:
[   37.517074] active_anon:20 inactive_anon:0 isolated_anon:0
[   37.517074]  active_file:235 inactive_file:0 isolated_file:0
[   37.517074]  unevictable:6975 dirty:0 writeback:0 unstable:0
[   37.517074]  slab_reclaimable:40521 slab_unreclaimable:7389
[   37.517074]  mapped:248 shmem:0 pagetables:7 bounce:0
[   37.517074]  free:695 free_pcp:108 free_cma:0
[   37.537368] Node 0 DMA free:980kB min:128kB low:160kB high:192kB active_anon:4kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:1452kB slab_unreclaimable:9624kB kernel_stack:1056kB pagetables:8kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[   37.587076] lowmem_reserve[]: 0 213 213 213
[   37.589035] Node 0 DMA32 free:1800kB min:1804kB low:2252kB high:2704kB active_anon:76kB inactive_anon:0kB active_file:940kB inactive_file:0kB unevictable:27900kB isolated(anon):0kB isolated(file):0kB present:311168kB managed:218944kB mlocked:0kB dirty:0kB writeback:0kB mapped:992kB shmem:0kB slab_reclaimable:160632kB slab_unreclaimable:19932kB kernel_stack:880kB pagetables:20kB unstable:0kB bounce:0kB free_pcp:432kB local_pcp:144kB free_cma:0kB writeback_tmp:0kB pages_scanned:27928 all_unreclaimable? yes
[   37.619847] lowmem_reserve[]: 0 0 0 0
[   37.626611] Node 0 DMA: 1*4kB (U) 2*8kB (UE) 0*16kB 0*32kB 1*64kB (E) 1*128kB (U) 1*256kB (U) 1*512kB (E) 0*1024kB 0*2048kB 0*4096kB = 980kB
[   37.637092] Node 0 DMA32: 0*4kB 1*8kB (E) 2*16kB (UE) 1*32kB (E) 5*64kB (UME) 5*128kB (UME) 3*256kB (UE) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1800kB
[   37.647889] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[   37.657973] 7212 total pagecache pages
[   37.663038] 0 pages in swap cache
[   37.664748] Swap cache stats: add 0, delete 0, find 0/0
[   37.670312] Free swap  = 0kB
[   37.671896] Total swap = 0kB
[   37.676721] 81790 pages RAM
[   37.679531] 0 pages HighMem/MovableOnly
[   37.686236] 23077 pages reserved
[   37.687821] 0 pages hwpoisoned
[   37.692504] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
[   37.699413] [  127]     0   127     1115      222       7       3        0             0 v86d
[   37.706628] Out of memory: Kill process 127 (v86d) score 3 or sacrifice child
[   37.727285] Killed process 127 (v86d) total-vm:4460kB, anon-rss:88kB, file-rss:800kB
[   37.755541] v86d (127) used greatest stack depth: 13520 bytes left
[   37.758232] swapper/0 invoked oom-killer: gfp_mask=0x24002c2, order=0, oom_score_adj=0
[   37.758241] swapper/0 cpuset=/ mems_allowed=0
[   37.758249] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-08150-g08d7865 #1
[   37.758252] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   37.758263]  0000000000000000 ffff8800132bbb78 ffffffff8173760d ffff8800132bbcc8
[   37.758268]  ffff8800132bbbe8 ffffffff811fb624 ffffffff811a854c 00000001132bbbc8
[   37.758275]  0000000000000246 ffff8800132b4850 00000000004d3341 ffff8800132bbcc8
[   37.758276] Call Trace:
[   37.758296]  [<ffffffff8173760d>] dump_stack+0x4b/0x63
[   37.758303]  [<ffffffff811fb624>] dump_header+0x57/0x1f2
[   37.758309]  [<ffffffff811a854c>] ? rcu_read_unlock+0x5d/0x5f
[   37.758314]  [<ffffffff811a90a9>] out_of_memory+0x3a5/0x3f1
[   37.758320]  [<ffffffff811addb5>] __alloc_pages_slowpath+0x62d/0x68d
[   37.758326]  [<ffffffff811adfab>] __alloc_pages_nodemask+0x196/0x2dc
[   37.758334]  [<ffffffff811e5b51>] alloc_page_interleave+0x37/0x7a
[   37.758339]  [<ffffffff811e6193>] alloc_pages_current+0x79/0xe2
[   37.758345]  [<ffffffff811d94fa>] __vmalloc_node_range+0x168/0x22e
[   37.758352]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.758356]  [<ffffffff811d95ee>] __vmalloc_node+0x2e/0x30
[   37.758359]  [<ffffffff8467c898>] ? init_mtdram+0x3c/0xc4
[   37.758363]  [<ffffffff811d9776>] vmalloc+0x2a/0x2c
[   37.758367]  [<ffffffff8467c898>] init_mtdram+0x3c/0xc4
[   37.758370]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.758376]  [<ffffffff81002174>] do_one_initcall+0xe7/0x173
[   37.758383]  [<ffffffff84606131>] kernel_init_freeable+0x1bf/0x24c
[   37.758396]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.758400]  [<ffffffff82e0b147>] kernel_init+0xe/0xd9
[   37.758404]  [<ffffffff82e173df>] ret_from_fork+0x3f/0x70
[   37.758408]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.758411] Mem-Info:
[   37.758421] active_anon:10 inactive_anon:0 isolated_anon:0
[   37.758421]  active_file:17 inactive_file:0 isolated_file:0
[   37.758421]  unevictable:7189 dirty:0 writeback:0 unstable:0
[   37.758421]  slab_reclaimable:40528 slab_unreclaimable:7401
[   37.758421]  mapped:1 shmem:0 pagetables:7 bounce:0
[   37.758421]  free:722 free_pcp:115 free_cma:0
[   37.758435] Node 0 DMA free:980kB min:128kB low:160kB high:192kB active_anon:8kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:1464kB slab_unreclaimable:9644kB kernel_stack:1136kB pagetables:8kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[   37.758442] lowmem_reserve[]: 0 213 213 213
[   37.758455] Node 0 DMA32 free:1908kB min:1804kB low:2252kB high:2704kB active_anon:32kB inactive_anon:0kB active_file:68kB inactive_file:0kB unevictable:28756kB isolated(anon):0kB isolated(file):0kB present:311168kB managed:218944kB mlocked:0kB dirty:0kB writeback:0kB mapped:4kB shmem:0kB slab_reclaimable:160648kB slab_unreclaimable:19960kB kernel_stack:880kB pagetables:20kB unstable:0kB bounce:0kB free_pcp:460kB local_pcp:144kB free_cma:0kB writeback_tmp:0kB pages_scanned:724 all_unreclaimable? yes
[   37.758461] lowmem_reserve[]: 0 0 0 0
[   37.758490] Node 0 DMA: 1*4kB (U) 4*8kB (UE) 0*16kB 0*32kB 1*64kB (E) 1*128kB (U) 1*256kB (U) 1*512kB (E) 0*1024kB 0*2048kB 0*4096kB = 996kB
[   37.758516] Node 0 DMA32: 4*4kB (UM) 2*8kB (M) 2*16kB (UM) 2*32kB (UE) 6*64kB (UME) 5*128kB (UME) 3*256kB (UE) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1920kB
[   37.758520] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[   37.758522] 7212 total pagecache pages
[   37.758523] 0 pages in swap cache
[   37.758526] Swap cache stats: add 0, delete 0, find 0/0
[   37.758527] Free swap  = 0kB
[   37.758528] Total swap = 0kB
[   37.758531] 81790 pages RAM
[   37.758532] 0 pages HighMem/MovableOnly
[   37.758534] 23077 pages reserved
[   37.758535] 0 pages hwpoisoned
[   37.758537] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
[   37.758591] Kernel panic - not syncing: Out of memory and no killable processes...
[   37.758591] 
[   37.758595] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-08150-g08d7865 #1
[   37.758597] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   37.758603]  0000000000000000 ffff8800132bbb68 ffffffff8173760d ffffffff83a8ed36
[   37.758608]  ffff8800132bbbe8 ffffffff811a3c59 ffff880000000008 ffff8800132bbbf8
[   37.758614]  ffff8800132bbb90 00000001132bbbc8 0000000000002ebc 0000000000001ea0
[   37.758615] Call Trace:
[   37.758619]  [<ffffffff8173760d>] dump_stack+0x4b/0x63
[   37.758625]  [<ffffffff811a3c59>] panic+0xcc/0x213
[   37.758630]  [<ffffffff811a90b5>] out_of_memory+0x3b1/0x3f1
[   37.758635]  [<ffffffff811addb5>] __alloc_pages_slowpath+0x62d/0x68d
[   37.758641]  [<ffffffff811adfab>] __alloc_pages_nodemask+0x196/0x2dc
[   37.758647]  [<ffffffff811e5b51>] alloc_page_interleave+0x37/0x7a
[   37.758652]  [<ffffffff811e6193>] alloc_pages_current+0x79/0xe2
[   37.758657]  [<ffffffff811d94fa>] __vmalloc_node_range+0x168/0x22e
[   37.758661]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.758666]  [<ffffffff811d95ee>] __vmalloc_node+0x2e/0x30
[   37.758669]  [<ffffffff8467c898>] ? init_mtdram+0x3c/0xc4
[   37.758673]  [<ffffffff811d9776>] vmalloc+0x2a/0x2c
[   37.758677]  [<ffffffff8467c898>] init_mtdram+0x3c/0xc4
[   37.758681]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   37.758685]  [<ffffffff81002174>] do_one_initcall+0xe7/0x173
[   37.758690]  [<ffffffff84606131>] kernel_init_freeable+0x1bf/0x24c
[   37.758693]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.758697]  [<ffffffff82e0b147>] kernel_init+0xe/0xd9
[   37.758701]  [<ffffffff82e173df>] ret_from_fork+0x3f/0x70
[   37.758704]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   37.775268] Kernel Offset: disabled
[   38.408621] 
[   38.408623] =====================================
[   38.408623] [ BUG: bad unlock balance detected! ]
[   38.408627] 4.3.0-08150-g08d7865 #1 Not tainted
[   38.408627] -------------------------------------
[   38.408631] swapper/0/1 is trying to release lock (console_lock) at:
[   38.408639] [<ffffffff811a3cb1>] panic+0x124/0x213
[   38.408640] but there are no more locks to release!
[   38.408641] 
[   38.408641] other info that might help us debug this:
[   38.408642] 2 locks held by swapper/0/1:
[   38.408651]  #0:  (oom_lock){+.+...}, at: [<ffffffff811add45>] __alloc_pages_slowpath+0x5bd/0x68d
[   38.408656]  #1:  (panic_lock){......}, at: [<ffffffff811a3bd9>] panic+0x4c/0x213
[   38.408657] 
[   38.408657] stack backtrace:
[   38.408659] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-08150-g08d7865 #1
[   38.408660] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   38.408665]  0000000000000000 ffff8800132bba78 ffffffff8173760d ffff8800132b4040
[   38.408668]  ffff8800132bbaa0 ffffffff8111328c 00000000ffffffff ffff8800132b4040
[   38.408670]  ffffffff8406a080 ffff8800132bbb18 ffffffff8111626c ffffffff811139d1
[   38.408671] Call Trace:
[   38.408678]  [<ffffffff8173760d>] dump_stack+0x4b/0x63
[   38.408682]  [<ffffffff8111328c>] print_unlock_imbalance_bug+0xc7/0xd0
[   38.408685]  [<ffffffff8111626c>] lock_release+0x23f/0x41a
[   38.408686]  [<ffffffff811139d1>] ? lock_acquired+0xfc/0x2cb
[   38.408689]  [<ffffffff811a3cb1>] ? panic+0x124/0x213
[   38.408694]  [<ffffffff81123f39>] console_unlock+0x3f3/0x457
[   38.408696]  [<ffffffff811a3cb1>] panic+0x124/0x213
[   38.408699]  [<ffffffff811a90b5>] out_of_memory+0x3b1/0x3f1
[   38.408702]  [<ffffffff811addb5>] __alloc_pages_slowpath+0x62d/0x68d
[   38.408705]  [<ffffffff811adfab>] __alloc_pages_nodemask+0x196/0x2dc
[   38.408711]  [<ffffffff811e5b51>] alloc_page_interleave+0x37/0x7a
[   38.408714]  [<ffffffff811e6193>] alloc_pages_current+0x79/0xe2
[   38.408718]  [<ffffffff811d94fa>] __vmalloc_node_range+0x168/0x22e
[   38.408724]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   38.408726]  [<ffffffff811d95ee>] __vmalloc_node+0x2e/0x30
[   38.408728]  [<ffffffff8467c898>] ? init_mtdram+0x3c/0xc4
[   38.408730]  [<ffffffff811d9776>] vmalloc+0x2a/0x2c
[   38.408732]  [<ffffffff8467c898>] init_mtdram+0x3c/0xc4
[   38.408733]  [<ffffffff8467c85c>] ? init_pmc551+0x5e3/0x5e3
[   38.408738]  [<ffffffff81002174>] do_one_initcall+0xe7/0x173
[   38.408744]  [<ffffffff84606131>] kernel_init_freeable+0x1bf/0x24c
[   38.408747]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140
[   38.408749]  [<ffffffff82e0b147>] kernel_init+0xe/0xd9
[   38.408752]  [<ffffffff82e173df>] ret_from_fork+0x3f/0x70
[   38.408754]  [<ffffffff82e0b139>] ? rest_init+0x140/0x140

Elapsed time: 50
qemu-system-x86_64 -enable-kvm -cpu Nehalem -kernel /pkg/linux/x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED/gcc-5/08d78658f393fefaa2e6507ea052c6f8ef4002a2/vmlinuz-4.3.0-08150-g08d7865 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-intel12-yocto-x86_64-1/validate_boot-1-yocto-minimal-x86_64.cgz-x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED-08d78658f393fefaa2e6507ea052c6f8ef4002a2-20151114-93880-64kz11-0.yaml ARCH=x86_64 kconfig=x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED branch=linux-devel/devel-catchup-201511132213 commit=08d78658f393fefaa2e6507ea052c6f8ef4002a2 BOOT_IMAGE=/pkg/linux/x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED/gcc-5/08d78658f393fefaa2e6507ea052c6f8ef4002a2/vmlinuz-4.3.0-08150-g08d7865 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-intel12-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED/gcc-5/08d78658f393fefaa2e6507ea052c6f8ef4002a2/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-intel12-yocto-x86_64-1::dhcp drbd.minor_count=8'  -initrd /fs/KVM/initrd-vm-intel12-yocto-x86_64-1 -m 320 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/KVM/disk0-vm-intel12-yocto-x86_64-1,media=disk,if=virtio -drive file=/fs/KVM/disk1-vm-intel12-yocto-x86_64-1,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-intel12-yocto-x86_64-1 -serial file:/dev/shm/kboot/serial-vm-intel12-yocto-x86_64-1 -daemonize -display none -monitor null 





Thanks,
Ying Huang

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