slab kmalloc guard patch uncovers potential issue with crypto, triggered by cryptomgr_test

[Matt]

Hi Herbert,
Hi David,
(added maintainers according to https://www.kernel.org/doc/linux/MAINTAINERS)
Hi crypto ML,
running a kernel with Mikulas Patocka's kmalloc guard patch for slab
[ 1.439704] AVX2 version of gcm_enc/dec engaged.
[ 1.444420] alg: No test for __gcm-aes-aesni (__driver-gcm-aes-aesni)
[ 1.449029] kmalloc: red zone damaged, pointer ffff8807fa48bcc0,
real_size 192, size 160, red zone ffff8807fa4fccc0
[ 1.449033] CPU: 1 PID: 127 Comm: cryptomgr_test Not tainted 3.16.2-test+ #1
[ 1.449034] Hardware name: ASUS All Series/P9D WS, BIOS 1804 04/17/2014
[ 1.449036] 0000000000000000 ffffffff829ef90e ffff8807fa48bcc0
ffffffff8218c799
[ 1.449039] ffff8807fa48bcc0 ffffffff82186d9f ffff8807fa48bcc0
ffffffff824a22aa
[ 1.449042] ffffffffffffffff 0000000000000069 000000000000008a
ffffffff824a18c3
[ 1.449048] [<ffffffff829ef90e>] ? dump_stack+0x4a/0x75
[ 1.449052] [<ffffffff8218c799>] ? ksize+0x9/0x30
[ 1.449054] [<ffffffff82186d9f>] ? kzfree+0xf/0x30
[ 1.449057] [<ffffffff824a22aa>] ? alg_test_hash+0x4a/0x90
[ 1.449059] [<ffffffff824a18c3>] ? alg_test+0x113/0x2b0
[ 1.449062] [<ffffffff8249e4d0>] ? crypto_unregister_pcomp+0x10/0x10
[ 1.449064] [<ffffffff8249e508>] ? cryptomgr_test+0x38/0x40
[ 1.449066] [<ffffffff820e864a>] ? kthread+0xca/0xe0
[ 1.449068] [<ffffffff820e8580>] ? kthread_create_on_node+0x180/0x180
[ 1.449071] [<ffffffff829f752c>] ? ret_from_fork+0x7c/0xb0
[ 1.449072] [<ffffffff820e8580>] ? kthread_create_on_node+0x180/0x180
[ 1.449074] kmalloc: red zone damaged, pointer ffff8807fa48bcc0,
real_size 192, size 160, red zone ffff8807fa4fccc0
[ 1.449077] CPU: 1 PID: 127 Comm: cryptomgr_test Not tainted 3.16.2-test+ #1
[ 1.449078] Hardware name: ASUS All Series/P9D WS, BIOS 1804 04/17/2014
[ 1.449079] 0000000000000000 ffffffff829ef90e ffff8807fa48bcc0
ffffffff821b5d7f
[ 1.449082] ffff8807fa48bcc0 0000000000000000 ffffffff82ac18b8
ffff8807fa48bc00
[ 1.449084] 0000000000000000 ffff8807fa48bc40 ffffffff824a22aa
ffffffffffffffff
[ 1.449088] [<ffffffff829ef90e>] ? dump_stack+0x4a/0x75
[ 1.449091] [<ffffffff821b5d7f>] ? kfree+0x1f/0x1d0
[ 1.449093] [<ffffffff824a22aa>] ? alg_test_hash+0x4a/0x90
[ 1.449095] [<ffffffff824a18c3>] ? alg_test+0x113/0x2b0
[ 1.449097] [<ffffffff8249e4d0>] ? crypto_unregister_pcomp+0x10/0x10
[ 1.449099] [<ffffffff8249e508>] ? cryptomgr_test+0x38/0x40
[ 1.449101] [<ffffffff820e864a>] ? kthread+0xca/0xe0
[ 1.449102] [<ffffffff820e8580>] ? kthread_create_on_node+0x180/0x180
[ 1.449104] [<ffffffff829f752c>] ? ret_from_fork+0x7c/0xb0
[ 1.449106] [<ffffffff820e8580>] ? kthread_create_on_node+0x180/0x180
[ 1.449138] sha1_ssse3: Using AVX2 optimized SHA-1 implementation
[ 1.449182] alg: No test for crc32 (crc32-pclmul)
[ 1.449188] sha256_ssse3: Using AVX2 optimized SHA-256 implementation
[ 1.449262] sha512_ssse3: Using AVX2 optimized SHA-512 implementation
link to the patch: http://marc.info/?l=linux-kernel&m=140995770121230&w=2
The kernel this appears on only has 2 reiserfs fixes, BFQ, BFS and
https://github.com/kernelOfTruth/linux/commits/linux-3.16.2-test
Kernel config is attached
Kind Regards
Matt

Adding the main Linux Kernel Mailing List for good measure