Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

[Andy Shevchenko]

On Tue, 2015-10-27 at 17:46 +0200, Aaro Koskinen wrote:
> Hi,
> 
> With 4.3-rc7 and slub_debug=FZUP, I get the below when reading
> /sys/kernel/debug/kmemleak with a large number of reported entries.
> It's pretty repeatable. HW is MIPS64.
> 
> With the SLUB debugging disabled, box crashes randomly in
> kmem_cache_free
> or kmem_cache_alloc when the kmemleak file is read on a running
> system.
> 
> Seems to start with 6fc37c490076 ("kmemleak: use seq_hex_dump() to
> dump buffers").

So, you mean reverting it does help?

Btw, we have kmemleak test suite. Any suggestion how can it be
reproducible with it?

> 
> A.
> 
> ---8<---
> 
> [ÂÂÂ77.706850]
> =====================================================================
> ========
> [ÂÂÂ77.706871] BUG kmalloc-4096 (Not tainted): Redzone overwritten
> [ÂÂÂ77.706877] ------------------------------------------------------
> -----------------------
> [ÂÂÂ77.706877] 
> [ÂÂÂ77.706885] Disabling lock debugging due to kernel taint
> [ÂÂÂ77.706894] INFO: 0x800000002e939000-0x800000002e939000. First
> byte 0x0 instead of 0xcc
> [ÂÂÂ77.706914] INFO: Allocated in seq_buf_alloc+0x24/0x58 age=452
> cpu=2 pid=587
> [ÂÂÂ77.706928]Â	__slab_alloc.isra.72.constprop.75+0x4a4/0x508
> [ÂÂÂ77.706938]Â	__kmalloc+0x30c/0x3f0
> [ÂÂÂ77.706947]Â	seq_buf_alloc+0x24/0x58
> [ÂÂÂ77.706956]Â	seq_read+0x304/0x4a0
> [ÂÂÂ77.706968]Â	__vfs_read+0x3c/0x100
> [ÂÂÂ77.706977]Â	vfs_read+0x8c/0x138
> [ÂÂÂ77.706987]Â	SyS_read+0x64/0xe8
> [ÂÂÂ77.707000]Â	syscall_common+0x34/0x58
> [ÂÂÂ77.707012] INFO: Freed in seq_release+0x24/0x40 age=3450 cpu=3
> pid=584
> [ÂÂÂ77.707023]Â	__slab_free+0x340/0x4f0
> [ÂÂÂ77.707032]Â	seq_release+0x24/0x40
> [ÂÂÂ77.707044]Â	kernfs_fop_release+0x50/0x80
> [ÂÂÂ77.707055]Â	__fput+0xa4/0x218
> [ÂÂÂ77.707066]Â	task_work_run+0xb0/0x108
> [ÂÂÂ77.707078]Â	work_notifysig+0x10/0x18
> [ÂÂÂ77.707087] INFO: Slab 0x8000000003ec4440 objects=7 used=1
> fp=0x800000002e93e7b0 flags=0x200000004081
> [ÂÂÂ77.707095] INFO: Object 0x800000002e938000 @offset=0
> fp=0x800000002e939148
> [ÂÂÂ77.707095] 
> [ÂÂÂ77.707108] Object 800000002e938000: 75 6e 72 65 66 65 72 65 6e 63
> 65 64 20 6f 62 6aÂÂunreferenced obj
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> 30 30 30 30 32 66ÂÂect 0x800000002f
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> 7a 65 20 32 30 34ÂÂ372e68 (size 204
> [ÂÂÂ77.707138] Object 800000002e938030: 38 29 3a 0a 20 20 63 6f 6d 6d
> 20 22 73 77 61 70ÂÂ8):.ÂÂcomm "swap
> [ÂÂÂ77.707148] Object 800000002e938040: 70 65 72 2f 30 22 2c 20 70 69
> 64 20 31 2c 20 6aÂÂper/0", pid 1, j
> [ÂÂÂ77.707158] Object 800000002e938050: 69 66 66 69 65 73 20 34 32 39
> 34 39 33 38 30 35ÂÂiffies 429493805
> [ÂÂÂ77.707168] Object 800000002e938060: 31 20 28 61 67 65 20 34 31 2e
> 35 37 30 73 29 0aÂÂ1 (age 41.570s).
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> 20 28 66 69 72 73ÂÂÂÂhex dump (firs
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> [ÂÂÂ77.707784] Object 800000002e938440: 35 37 30 73 29 0a 20 20 68 65
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> [ÂÂÂ77.708390] Object 800000002e938810: 67 65 20 34 31 2e 35 37 30 73
> 29 0a 20 20 68 65ÂÂge 41.570s).ÂÂhe
> [ÂÂÂ77.708400] Object 800000002e938820: 78 20 64 75 6d 70 20 28 66 69
> 72 73 74 20 33 32ÂÂx dump (first 32
> [ÂÂÂ77.708410] Object 800000002e938830: 20 62 79 74 65 73 29 3a 0a 20
> 20 20 20 36 62 20ÂÂÂbytes):.ÂÂÂÂ6b 
> [ÂÂÂ77.708420] Object 800000002e938840: 36 62 20 36 62 20 36 62 20 36
> 62 20 36 62 20 36ÂÂ6b 6b 6b 6b 6b 6
> [ÂÂÂ77.708430] Object 800000002e938850: 62 20 36 62 20 36 62 20 36 62
> 20 36 62 20 36 62ÂÂb 6b 6b 6b 6b 6b
> [ÂÂÂ77.708440] Object 800000002e938860: 20 36 62 20 36 62 20 36 62 20
> 36 62 20 20 6b 6bÂÂÂ6b 6b 6b 6bÂÂkk
> [ÂÂÂ77.708450] Object 800000002e938870: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b 6b 6b 6b 0a 20ÂÂkkkkkkkkkkkkkk. 
> [ÂÂÂ77.708460] Object 800000002e938880: 20 20 20 36 62 20 36 62 20 36
> 62 20 36 62 20 36ÂÂÂÂÂ6b 6b 6b 6b 6
> [ÂÂÂ77.708470] Object 800000002e938890: 62 20 36 62 20 36 62 20 36 62
> 20 36 62 20 36 62ÂÂb 6b 6b 6b 6b 6b
> [ÂÂÂ77.708480] Object 800000002e9388a0: 20 36 62 20 36 62 20 36 62 20
> 36 62 20 36 62 20ÂÂÂ6b 6b 6b 6b 6b 
> [ÂÂÂ77.708490] Object 800000002e9388b0: 36 62 20 20 6b 6b 6b 6b 6b 6b
> 6b 6b 6b 6b 6b 6bÂÂ6bÂÂkkkkkkkkkkkk
> [ÂÂÂ77.708500] Object 800000002e9388c0: 6b 6b 6b 6b 0a 20 20 62 61 63
> 6b 74 72 61 63 65ÂÂkkkk.ÂÂbacktrace
> [ÂÂÂ77.708510] Object 800000002e9388d0: 3a 0a 20 20 20 20 5b 3c 66 66
> 66 66 66 66 66 66ÂÂ:.ÂÂÂÂ[<ffffffff
> [ÂÂÂ77.708520] Object 800000002e9388e0: 38 31 32 36 63 39 62 38 3e 5d
> 20 5f 5f 6b 6d 61ÂÂ8126c9b8>] __kma
> [ÂÂÂ77.708530] Object 800000002e9388f0: 6c 6c 6f 63 2b 30 78 31 62 38
> 2f 30 78 33 66 30ÂÂlloc+0x1b8/0x3f0
> [ÂÂÂ77.708540] Object 800000002e938900: 0a 20 20 20 20 5b 3c 66 66 66
> 66 66 66 66 66 38ÂÂ.ÂÂÂÂ[<ffffffff8
> [ÂÂÂ77.708549] Object 800000002e938910: 31 34 65 31 31 62 38 3e 5d 20
> 63 76 6d 5f 6f 63ÂÂ14e11b8>] cvm_oc
> [ÂÂÂ77.708559] Object 800000002e938920: 74 5f 6d 65 6d 5f 66 69 6c 6c
> 5f 66 70 61 2b 30ÂÂt_mem_fill_fpa+0
> [ÂÂÂ77.708569] Object 800000002e938930: 78 37 38 2f 30 78 31 64 38 0a
> 20 20 20 20 5b 3cÂÂx78/0x1d8.ÂÂÂÂ[<
> [ÂÂÂ77.708579] Object 800000002e938940: 66 66 66 66 66 66 66 66 38 31
> 34 64 66 64 33 38ÂÂffffffff814dfd38
> [ÂÂÂ77.708589] Object 800000002e938950: 3e 5d 20 63 76 6d 5f 6f 63 74
> 5f 70 72 6f 62 65ÂÂ>] cvm_oct_probe
> [ÂÂÂ77.708599] Object 800000002e938960: 2b 30 78 66 38 2f 30 78 37 62
> 30 0a 20 20 20 20ÂÂ+0xf8/0x7b0.ÂÂÂÂ
> [ÂÂÂ77.708609] Object 800000002e938970: 5b 3c 66 66 66 66 66 66 66 66
> 38 31 34 35 32 37ÂÂ[<ffffffff814527
> [ÂÂÂ77.708619] Object 800000002e938980: 61 38 3e 5d 20 70 6c 61 74 66
> 6f 72 6d 5f 64 72ÂÂa8>] platform_dr
> [ÂÂÂ77.708629] Object 800000002e938990: 76 5f 70 72 6f 62 65 2b 30 78
> 34 38 2f 30 78 64ÂÂv_probe+0x48/0xd
> [ÂÂÂ77.708639] Object 800000002e9389a0: 38 0a 20 20 20 20 5b 3c 66 66
> 66 66 66 66 66 66ÂÂ8.ÂÂÂÂ[<ffffffff
> [ÂÂÂ77.708649] Object 800000002e9389b0: 38 31 34 35 30 31 34 63 3e 5d
> 20 64 72 69 76 65ÂÂ8145014c>] drive
> [ÂÂÂ77.708659] Object 800000002e9389c0: 72 5f 70 72 6f 62 65 5f 64 65
> 76 69 63 65 2b 30ÂÂr_probe_device+0
> [ÂÂÂ77.708669] Object 800000002e9389d0: 78 32 39 63 2f 30 78 33 35 30
> 0a 20 20 20 20 5bÂÂx29c/0x350.ÂÂÂÂ[
> [ÂÂÂ77.708679] Object 800000002e9389e0: 3c 66 66 66 66 66 66 66 66 38
> 31 34 35 30 32 64ÂÂ<ffffffff814502d
> [ÂÂÂ77.708689] Object 800000002e9389f0: 30 3e 5d 20 5f 5f 64 72 69 76
> 65 72 5f 61 74 74ÂÂ0>] __driver_att
> [ÂÂÂ77.708699] Object 800000002e938a00: 61 63 68 2b 30 78 64 30 2f 30
> 78 64 38 0a 20 20ÂÂach+0xd0/0xd8.ÂÂ
> [ÂÂÂ77.708709] Object 800000002e938a10: 20 20 5b 3c 66 66 66 66 66 66
> 66 66 38 31 34 34ÂÂÂÂ[<ffffffff8144
> [ÂÂÂ77.708718] Object 800000002e938a20: 64 63 32 34 3e 5d 20 62 75 73
> 5f 66 6f 72 5f 65ÂÂdc24>] bus_for_e
> [ÂÂÂ77.708728] Object 800000002e938a30: 61 63 68 5f 64 65 76 2b 30 78
> 37 34 2f 30 78 63ÂÂach_dev+0x74/0xc
> [ÂÂÂ77.708738] Object 800000002e938a40: 30 0a 20 20 20 20 5b 3c 66 66
> 66 66 66 66 66 66ÂÂ0.ÂÂÂÂ[<ffffffff
> [ÂÂÂ77.708748] Object 800000002e938a50: 38 31 34 34 66 35 39 38 3e 5d
> 20 62 75 73 5f 61ÂÂ8144f598>] bus_a
> [ÂÂÂ77.708758] Object 800000002e938a60: 64 64 5f 64 72 69 76 65 72 2b
> 30 78 32 30 38 2fÂÂdd_driver+0x208/
> [ÂÂÂ77.708768] Object 800000002e938a70: 30 78 32 38 30 0a 20 20 20 20
> 5b 3c 66 66 66 66ÂÂ0x280.ÂÂÂÂ[<ffff
> [ÂÂÂ77.708778] Object 800000002e938a80: 66 66 66 66 38 31 34 35 31 30
> 30 30 3e 5d 20 64ÂÂffff81451000>] d
> [ÂÂÂ77.708788] Object 800000002e938a90: 72 69 76 65 72 5f 72 65 67 69
> 73 74 65 72 2b 30ÂÂriver_register+0
> [ÂÂÂ77.708798] Object 800000002e938aa0: 78 39 30 2f 30 78 31 33 38 0a
> 20 20 20 20 5b 3cÂÂx90/0x138.ÂÂÂÂ[<
> [ÂÂÂ77.708808] Object 800000002e938ab0: 66 66 66 66 66 66 66 66 38 31
> 31 30 30 35 35 30ÂÂffffffff81100550
> [ÂÂÂ77.708818] Object 800000002e938ac0: 3e 5d 20 64 6f 5f 6f 6e 65 5f
> 69 6e 69 74 63 61ÂÂ>] do_one_initca
> [ÂÂÂ77.708828] Object 800000002e938ad0: 6c 6c 2b 30 78 61 30 2f 30 78
> 31 63 30 0a 20 20ÂÂll+0xa0/0x1c0.ÂÂ
> [ÂÂÂ77.708838] Object 800000002e938ae0: 20 20 5b 3c 66 66 66 66 66 66
> 66 66 38 31 38 33ÂÂÂÂ[<ffffffff8183
> [ÂÂÂ77.708848] Object 800000002e938af0: 63 65 31 34 3e 5d 20 6b 65 72
> 6e 65 6c 5f 69 6eÂÂce14>] kernel_in
> [ÂÂÂ77.708858] Object 800000002e938b00: 69 74 5f 66 72 65 65 61 62 6c
> 65 2b 30 78 31 38ÂÂit_freeable+0x18
> [ÂÂÂ77.708868] Object 800000002e938b10: 38 2f 30 78 32 34 34 0a 20 20
> 20 20 5b 3c 66 66ÂÂ8/0x244.ÂÂÂÂ[<ff
> [ÂÂÂ77.708878] Object 800000002e938b20: 66 66 66 66 66 66 38 31 36 31
> 61 30 31 38 3e 5dÂÂffffff8161a018>]
> [ÂÂÂ77.708888] Object 800000002e938b30: 20 6b 65 72 6e 65 6c 5f 69 6e
> 69 74 2b 30 78 32ÂÂÂkernel_init+0x2
> [ÂÂÂ77.708897] Object 800000002e938b40: 30 2f 30 78 31 31 38 0a 20 20
> 20 20 5b 3c 66 66ÂÂ0/0x118.ÂÂÂÂ[<ff
> [ÂÂÂ77.708907] Object 800000002e938b50: 66 66 66 66 66 66 38 31 31 32
> 30 61 36 63 3e 5dÂÂffffff81120a6c>]
> [ÂÂÂ77.708917] Object 800000002e938b60: 20 72 65 74 5f 66 72 6f 6d 5f
> 6b 65 72 6e 65 6cÂÂÂret_from_kernel
> [ÂÂÂ77.708927] Object 800000002e938b70: 5f 74 68 72 65 61 64 2b 30 78
> 31 34 2f 30 78 31ÂÂ_thread+0x14/0x1
> [ÂÂÂ77.708937] Object 800000002e938b80: 63 0a 75 6e 72 65 66 65 72 65
> 6e 63 65 64 20 6fÂÂc.unreferenced o
> [ÂÂÂ77.708947] Object 800000002e938b90: 62 6a 65 63 74 20 30 78 38 30
> 30 30 30 30 30 30ÂÂbject 0x80000000
> [ÂÂÂ77.708957] Object 800000002e938ba0: 32 66 33 37 34 61 34 30 20 28
> 73 69 7a 65 20 32ÂÂ2f374a40 (size 2
> [ÂÂÂ77.708967] Object 800000002e938bb0: 30 34 38 29 3a 0a 20 20 63 6f
> 6d 6d 20 22 73 77ÂÂ048):.ÂÂcomm "sw
> [ÂÂÂ77.708977] Object 800000002e938bc0: 61 70 70 65 72 2f 30 22 2c 20
> 70 69 64 20 31 2cÂÂapper/0", pid 1,
> [ÂÂÂ77.708987] Object 800000002e938bd0: 20 6a 69 66 66 69 65 73 20 34
> 32 39 34 39 33 38ÂÂÂjiffies 4294938
> [ÂÂÂ77.708997] Object 800000002e938be0: 30 35 31 20 28 61 67 65 20 34
> 31 2e 35 37 30 73ÂÂ051 (age 41.570s
> [ÂÂÂ77.709007] Object 800000002e938bf0: 29 0a 20 20 68 65 78 20 64 75
> 6d 70 20 28 66 69ÂÂ).ÂÂhex dump (fi
> [ÂÂÂ77.709017] Object 800000002e938c00: 72 73 74 20 33 32 20 62 79 74
> 65 73 29 3a 0a 20ÂÂrst 32 bytes):. 
> [ÂÂÂ77.709027] Object 800000002e938c10: 20 20 20 36 62 20 36 62 20 36
> 62 20 36 62 20 36ÂÂÂÂÂ6b 6b 6b 6b 6
> [ÂÂÂ77.709037] Object 800000002e938c20: 62 20 36 62 20 36 62 20 36 62
> 20 36 62 20 36 62ÂÂb 6b 6b 6b 6b 6b
> [ÂÂÂ77.709047] Object 800000002e938c30: 20 36 62 20 36 62 20 36 62 20
> 36 62 20 36 62 20ÂÂÂ6b 6b 6b 6b 6b 
> [ÂÂÂ77.709056] Object 800000002e938c40: 36 62 20 20 6b 6b 6b 6b 6b 6b
> 6b 6b 6b 6b 6b 6bÂÂ6bÂÂkkkkkkkkkkkk
> [ÂÂÂ77.709066] Object 800000002e938c50: 6b 6b 6b 6b 0a 20 20 20 20 36
> 62 20 36 62 20 36ÂÂkkkk.ÂÂÂÂ6b 6b 6
> [ÂÂÂ77.709076] Object 800000002e938c60: 62 20 36 62 20 36 62 20 36 62
> 20 36 62 20 36 62ÂÂb 6b 6b 6b 6b 6b
> [ÂÂÂ77.709086] Object 800000002e938c70: 20 36 62 20 36 62 20 36 62 20
> 36 62 20 36 62 20ÂÂÂ6b 6b 6b 6b 6b 
> [ÂÂÂ77.709096] Object 800000002e938c80: 36 62 20 36 62 20 36 62 20 20
> 6b 6b 6b 6b 6b 6bÂÂ6b 6b 6bÂÂkkkkkk
> [ÂÂÂ77.709106] Object 800000002e938c90: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 0a 20 20 62 61 63ÂÂkkkkkkkkkk.ÂÂbac
> [ÂÂÂ77.709116] Object 800000002e938ca0: 6b 74 72 61 63 65 3a 0a 20 20
> 20 20 5b 3c 66 66ÂÂktrace:.ÂÂÂÂ[<ff
> [ÂÂÂ77.709126] Object 800000002e938cb0: 66 66 66 66 66 66 38 31 32 36
> 63 39 62 38 3e 5dÂÂffffff8126c9b8>]
> [ÂÂÂ77.709136] Object 800000002e938cc0: 20 5f 5f 6b 6d 61 6c 6c 6f 63
> 2b 30 78 31 62 38ÂÂÂ__kmalloc+0x1b8
> [ÂÂÂ77.709146] Object 800000002e938cd0: 2f 30 78 33 66 30 0a 20 20 20
> 20 5b 3c 66 66 66ÂÂ/0x3f0.ÂÂÂÂ[<fff
> [ÂÂÂ77.709156] Object 800000002e938ce0: 66 66 66 66 66 38 31 34 65 31
> 31 62 38 3e 5d 20ÂÂfffff814e11b8>] 
> [ÂÂÂ77.709166] Object 800000002e938cf0: 63 76 6d 5f 6f 63 74 5f 6d 65
> 6d 5f 66 69 6c 6cÂÂcvm_oct_mem_fill
> [ÂÂÂ77.709176] Object 800000002e938d00: 5f 66 70 61 2b 30 78 37 38 2f
> 30 78 31 64 38 0aÂÂ_fpa+0x78/0x1d8.
> [ÂÂÂ77.709186] Object 800000002e938d10: 20 20 20 20 5b 3c 66 66 66 66
> 66 66 66 66 38 31ÂÂÂÂÂÂ[<ffffffff81
> [ÂÂÂ77.709196] Object 800000002e938d20: 34 64 66 64 33 38 3e 5d 20 63
> 76 6d 5f 6f 63 74ÂÂ4dfd38>] cvm_oct
> [ÂÂÂ77.709206] Object 800000002e938d30: 5f 70 72 6f 62 65 2b 30 78 66
> 38 2f 30 78 37 62ÂÂ_probe+0xf8/0x7b
> [ÂÂÂ77.709216] Object 800000002e938d40: 30 0a 20 20 20 20 5b 3c 66 66
> 66 66 66 66 66 66ÂÂ0.ÂÂÂÂ[<ffffffff
> [ÂÂÂ77.709225] Object 800000002e938d50: 38 31 34 35 32 37 61 38 3e 5d
> 20 70 6c 61 74 66ÂÂ814527a8>] platf
> [ÂÂÂ77.709235] Object 800000002e938d60: 6f 72 6d 5f 64 72 76 5f 70 72
> 6f 62 65 2b 30 78ÂÂorm_drv_probe+0x
> [ÂÂÂ77.709245] Object 800000002e938d70: 34 38 2f 30 78 64 38 0a 20 20
> 20 20 5b 3c 66 66ÂÂ48/0xd8.ÂÂÂÂ[<ff
> [ÂÂÂ77.709255] Object 800000002e938d80: 66 66 66 66 66 66 38 31 34 35
> 30 31 34 63 3e 5dÂÂffffff8145014c>]
> [ÂÂÂ77.709265] Object 800000002e938d90: 20 64 72 69 76 65 72 5f 70 72
> 6f 62 65 5f 64 65ÂÂÂdriver_probe_de
> [ÂÂÂ77.709275] Object 800000002e938da0: 76 69 63 65 2b 30 78 32 39 63
> 2f 30 78 33 35 30ÂÂvice+0x29c/0x350
> [ÂÂÂ77.709285] Object 800000002e938db0: 0a 20 20 20 20 5b 3c 66 66 66
> 66 66 66 66 66 38ÂÂ.ÂÂÂÂ[<ffffffff8
> [ÂÂÂ77.709295] Object 800000002e938dc0: 31 34 35 30 32 64 30 3e 5d 20
> 5f 5f 64 72 69 76ÂÂ14502d0>] __driv
> [ÂÂÂ77.709305] Object 800000002e938dd0: 65 72 5f 61 74 74 61 63 68 2b
> 30 78 64 30 2f 30ÂÂer_attach+0xd0/0
> [ÂÂÂ77.709315] Object 800000002e938de0: 78 64 38 0a 20 20 20 20 5b 3c
> 66 66 66 66 66 66ÂÂxd8.ÂÂÂÂ[<ffffff
> [ÂÂÂ77.709325] Object 800000002e938df0: 66 66 38 31 34 34 64 63 32 34
> 3e 5d 20 62 75 73ÂÂff8144dc24>] bus
> [ÂÂÂ77.709335] Object 800000002e938e00: 5f 66 6f 72 5f 65 61 63 68 5f
> 64 65 76 2b 30 78ÂÂ_for_each_dev+0x
> [ÂÂÂ77.709345] Object 800000002e938e10: 37 34 2f 30 78 63 30 0a 20 20
> 20 20 5b 3c 66 66ÂÂ74/0xc0.ÂÂÂÂ[<ff
> [ÂÂÂ77.709355] Object 800000002e938e20: 66 66 66 66 66 66 38 31 34 34
> 66 35 39 38 3e 5dÂÂffffff8144f598>]
> [ÂÂÂ77.709365] Object 800000002e938e30: 20 62 75 73 5f 61 64 64 5f 64
> 72 69 76 65 72 2bÂÂÂbus_add_driver+
> [ÂÂÂ77.709375] Object 800000002e938e40: 30 78 32 30 38 2f 30 78 32 38
> 30 0a 20 20 20 20ÂÂ0x208/0x280.ÂÂÂÂ
> [ÂÂÂ77.709385] Object 800000002e938e50: 5b 3c 66 66 66 66 66 66 66 66
> 38 31 34 35 31 30ÂÂ[<ffffffff814510
> [ÂÂÂ77.709394] Object 800000002e938e60: 30 30 3e 5d 20 64 72 69 76 65
> 72 5f 72 65 67 69ÂÂ00>] driver_regi
> [ÂÂÂ77.709404] Object 800000002e938e70: 73 74 65 72 2b 30 78 39 30 2f
> 30 78 31 33 38 0aÂÂster+0x90/0x138.
> [ÂÂÂ77.709414] Object 800000002e938e80: 20 20 20 20 5b 3c 66 66 66 66
> 66 66 66 66 38 31ÂÂÂÂÂÂ[<ffffffff81
> [ÂÂÂ77.709424] Object 800000002e938e90: 31 30 30 35 35 30 3e 5d 20 64
> 6f 5f 6f 6e 65 5fÂÂ100550>] do_one_
> [ÂÂÂ77.709434] Object 800000002e938ea0: 69 6e 69 74 63 61 6c 6c 2b 30
> 78 61 30 2f 30 78ÂÂinitcall+0xa0/0x
> [ÂÂÂ77.709444] Object 800000002e938eb0: 31 63 30 0a 20 20 20 20 5b 3c
> 66 66 66 66 66 66ÂÂ1c0.ÂÂÂÂ[<ffffff
> [ÂÂÂ77.709454] Object 800000002e938ec0: 66 66 38 31 38 33 63 65 31 34
> 3e 5d 20 6b 65 72ÂÂff8183ce14>] ker
> [ÂÂÂ77.709464] Object 800000002e938ed0: 6e 65 6c 5f 69 6e 69 74 5f 66
> 72 65 65 61 62 6cÂÂnel_init_freeabl
> [ÂÂÂ77.709474] Object 800000002e938ee0: 65 2b 30 78 31 38 38 2f 30 78
> 32 34 34 0a 20 20ÂÂe+0x188/0x244.ÂÂ
> [ÂÂÂ77.709484] Object 800000002e938ef0: 20 20 5b 3c 66 66 66 66 66 66
> 66 66 38 31 36 31ÂÂÂÂ[<ffffffff8161
> [ÂÂÂ77.709494] Object 800000002e938f00: 61 30 31 38 3e 5d 20 6b 65 72
> 6e 65 6c 5f 69 6eÂÂa018>] kernel_in
> [ÂÂÂ77.709504] Object 800000002e938f10: 69 74 2b 30 78 32 30 2f 30 78
> 31 31 38 0a 20 20ÂÂit+0x20/0x118.ÂÂ
> [ÂÂÂ77.709514] Object 800000002e938f20: 20 20 5b 3c 66 66 66 66 66 66
> 66 66 38 31 31 32ÂÂÂÂ[<ffffffff8112
> [ÂÂÂ77.709524] Object 800000002e938f30: 30 61 36 63 3e 5d 20 72 65 74
> 5f 66 72 6f 6d 5fÂÂ0a6c>] ret_from_
> [ÂÂÂ77.709534] Object 800000002e938f40: 6b 65 72 6e 65 6c 5f 74 68 72
> 65 61 64 2b 30 78ÂÂkernel_thread+0x
> [ÂÂÂ77.709544] Object 800000002e938f50: 31 34 2f 30 78 31 63 0a 75 6e
> 72 65 66 65 72 65ÂÂ14/0x1c.unrefere
> [ÂÂÂ77.709553] Object 800000002e938f60: 6e 63 65 64 20 6f 62 6a 65 63
> 74 20 30 78 38 30ÂÂnced object 0x80
> [ÂÂÂ77.709563] Object 800000002e938f70: 30 30 30 30 30 30 32 66 33 37
> 32 65 36 38 20 28ÂÂ0000002f372e68 (
> [ÂÂÂ77.709573] Object 800000002e938f80: 73 69 7a 65 20 32 30 34 38 29
> 3a 0a 20 20 63 6fÂÂsize 2048):.ÂÂco
> [ÂÂÂ77.709583] Object 800000002e938f90: 6d 6d 20 22 73 77 61 70 70 65
> 72 2f 30 22 2c 20ÂÂmm "swapper/0", 
> [ÂÂÂ77.709593] Object 800000002e938fa0: 70 69 64 20 31 2c 20 6a 69 66
> 66 69 65 73 20 34ÂÂpid 1, jiffies 4
> [ÂÂÂ77.709603] Object 800000002e938fb0: 32 39 34 39 33 38 30 35 31 20
> 28 61 67 65 20 34ÂÂ294938051 (age 4
> [ÂÂÂ77.709613] Object 800000002e938fc0: 31 2e 35 37 30 73 29 0a 20 20
> 68 65 78 20 64 75ÂÂ1.570s).ÂÂhex du
> [ÂÂÂ77.709623] Object 800000002e938fd0: 6d 70 20 28 66 69 72 73 74 20
> 33 32 20 62 79 74ÂÂmp (first 32 byt
> [ÂÂÂ77.709633] Object 800000002e938fe0: 65 73 29 3a 0a 20 20 20 20 36
> 62 20 36 62 20 36ÂÂes):.ÂÂÂÂ6b 6b 6
> [ÂÂÂ77.709643] Object 800000002e938ff0: 62 20 36 62 20 36 62 20 36 62
> 20 36 62 20 00 20ÂÂb 6b 6b 6b 6b . 
> [ÂÂÂ77.709653] Redzone 800000002e939000: 00 cc cc cc cc cc cc
> ccÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ........
> [ÂÂÂ77.709663] Padding 800000002e939140: 5a 5a 5a 5a 5a 5a 5a
> 5aÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂZZZZZZZZ
> [ÂÂÂ77.709675] CPU: 2 PID: 587 Comm: wc Tainted:
> GÂÂÂÂBÂÂÂÂÂÂÂÂÂÂÂ4.3.0-rc7-octeon-distro.git-v1.14-dirty #1
> [ÂÂÂ77.709682] Stack : 0000000000000000 ffffffff817c0000
> ffffffff81f50000 ffffffff817c6c18
> [ÂÂÂ77.709682]Â	ÂÂ0000000000000002 0000000000000004
> ffffffff817c0000 0000000000000000
> [ÂÂÂ77.709682]Â	ÂÂffffffff81f50000 0000000000000002
> 0000000000000004 0000000000000002
> [ÂÂÂ77.709682]Â	ÂÂ0000000000000004 ffffffff81199a4c
> 0000000000000000 0000000000000000
> [ÂÂÂ77.709682]Â	ÂÂffffffff81f50000 0000000000000009
> ffffffff816f2990 ffffffff81199eb8
> [ÂÂÂ77.709682]Â	ÂÂ800000002fad0e48 ffffffff81f47bf8
> 000000000000024b 0000000000000002
> [ÂÂÂ77.709682]Â	ÂÂ8000000003ec4440 ffffffff816ffc20
> 000000000003c400 ffffffff8121641c
> [ÂÂÂ77.709682]Â	ÂÂ800000002f8bbb98 800000002f8bba80
> 8000000003ec4440 ffffffff813c41e0
> [ÂÂÂ77.709682]Â	ÂÂffffffff816eb028 ffffffff8119ab9c
> 000000000000005a ffffffff816eb028
> [ÂÂÂ77.709682]Â	ÂÂ0000000000000002 ffffffff81127020
> 0000000000000000 0000000000000000
> [ÂÂÂ77.709682]Â	ÂÂ...
> [ÂÂÂ77.709819] Call Trace:
> [ÂÂÂ77.709829] [<ffffffff81127020>] show_stack+0x98/0xb8
> [ÂÂÂ77.709843] [<ffffffff813c41e0>] dump_stack+0x80/0xd0
> [ÂÂÂ77.709856] [<ffffffff81268450>]
> check_bytes_and_report+0x118/0x150
> [ÂÂÂ77.709867] [<ffffffff812686a0>] check_object+0x218/0x2e8
> [ÂÂÂ77.709879] [<ffffffff81269e04>] free_debug_processing+0x1e4/0x3f8
> [ÂÂÂ77.709890] [<ffffffff8126cf30>] __slab_free+0x340/0x4f0
> [ÂÂÂ77.709901] [<ffffffff812a68b4>] seq_release+0x24/0x40
> [ÂÂÂ77.709912] [<ffffffff8127f02c>] __fput+0xa4/0x218
> [ÂÂÂ77.709924] [<ffffffff81167678>] task_work_run+0xb0/0x108
> [ÂÂÂ77.709935] [<ffffffff81120c88>] work_notifysig+0x10/0x18
> [ÂÂÂ77.709943] 
> [ÂÂÂ77.709951] FIX kmalloc-4096: Restoring 0x800000002e939000-
> 0x800000002e939000=0xcc
> [ÂÂÂ77.709951] 

-- 
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy

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