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Subject[BUG -next 20181008] list corruption with "mm/slub: remove useless condition in deactivate_slab"
Hello,

with linux-next for 20181008 I can reliably crash my system with lot's of
debugging options enabled on s390. List debugging triggers the list
corruption below, which I could bisect down to this commit:

fde06e07750477f049f12d7d471ffa505338a3e7 is the first bad commit
commit fde06e07750477f049f12d7d471ffa505338a3e7
Author: Pingfan Liu <kernelfans@gmail.com>
Date: Thu Oct 4 07:43:01 2018 +1000

mm/slub: remove useless condition in deactivate_slab

The var l should be used to reflect the original list, on which the page
should be. But c->page is not on any list. Furthermore, the current code
does not update the value of l. Hence remove the related logic

Link: http://lkml.kernel.org/r/1537941430-16217-1-git-send-email-kernelfans@gmail.com
Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

list_add double add: new=000003d1029ecc08, prev=000000008ff846d0,next=000003d1029ecc08.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
illegal operation: 0001 ilc:1 [#1] PREEMPT SMP
Modules linked in:
CPU: 3 PID: 106 Comm: (sd-executor) Not tainted 4.19.0-rc6-00291-gfde06e077504 #21
Hardware name: IBM 2964 NC9 702 (z/VM 6.4.0)
Krnl PSW : (____ptrval____) (____ptrval____) (__list_add_valid+0x98/0xa8)
R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3
Krnl GPRS: 0000000074311fdf 0000000080000001 0000000000000058 0000000000e7b8b2
0000000000000000 0000000075438c64 00000000a7b31928 001c007b00000000
000000008fe99d00 00000000a7b31b40 000003d1029ecc08 00000000a7c03a80
000003d1029ecc08 000000008ff84680 00000000007b5674 00000000a7c03960
Krnl Code: 00000000007b5668: c0200034734a larl %r2,e43cfc
00000000007b566e: c0e5ffd0cf51 brasl %r14,1cf510
#00000000007b5674: a7f40001 brc 15,7b5676
>00000000007b5678: a7290001 lghi %r2,1
00000000007b567c: ebcff0a00004 lmg %r12,%r15,160(%r15)
00000000007b5682: 07fe bcr 15,%r14
00000000007b5684: 0707 bcr 0,%r7
00000000007b5686: 0707 bcr 0,%r7
Call Trace:
([<00000000007b5674>] __list_add_valid+0x94/0xa8)
[<000000000037d30e>] deactivate_slab.isra.15+0x45e/0x810
[<000000000037ede4>] ___slab_alloc+0x76c/0x7c0
[<000000000037eeb0>] __slab_alloc.isra.16+0x78/0xa8
[<00000000003808c8>] kmem_cache_alloc+0x160/0x458
[<0000000000141a3a>] vm_area_dup+0x3a/0x60
[<0000000000142f0a>] copy_process+0xd72/0x2100
[<000000000014449a>] _do_fork+0xba/0x688
[<0000000000144bb0>] sys_clone+0x48/0x50
[<0000000000b8faf0>] system_call+0xd8/0x2d0
INFO: lockdep is turned off.
Last Breaking-Event-Address:
[<00000000007b5674>] __list_add_valid+0x94/0xa8

Kernel panic - not syncing: Fatal exception: panic_on_oops

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