"mm: reparent slab memory on cgroup removal" series triggers SLUB_DEBUG errors

From: Qian Cai
Date: Tue Jun 18 2019 - 17:48:13 EST

Booting linux-next on both arm64 and powerpc triggers SLUB_DEBUG errors below. Reverted the whole series âmm: reparent slab memory on cgroup removalâ [1] fixed the issue.

[1] https://lore.kernel.org/lkml/20190611231813.3148843-1-guro@xxxxxx/

[ 151.773224][ T1650] BUG kmem_cache (Tainted: G B W ): Poison overwritten
[ 151.780969][ T1650] -----------------------------------------------------------------------------
[ 151.780969][ T1650]
[ 151.792016][ T1650] INFO: 0x000000001fd6fdef-0x0000000007f6bb36. First byte 0x0 instead of 0x6b
[ 151.800726][ T1650] INFO: Allocated in create_cache+0x6c/0x1bc age=24301 cpu=97 pid=1444
[ 151.808821][ T1650] kmem_cache_alloc+0x514/0x568
[ 151.813527][ T1650] create_cache+0x6c/0x1bc
[ 151.817800][ T1650] memcg_create_kmem_cache+0xfc/0x11c
[ 151.823028][ T1650] memcg_kmem_cache_create_func+0x40/0x170
[ 151.828691][ T1650] process_one_work+0x4e0/0xa54
[ 151.833398][ T1650] worker_thread+0x498/0x650
[ 151.837843][ T1650] kthread+0x1b8/0x1d4
[ 151.841770][ T1650] ret_from_fork+0x10/0x18
[ 151.846046][ T1650] INFO: Freed in slab_kmem_cache_release+0x3c/0x48 age=23341 cpu=28 pid=1480
[ 151.854659][ T1650] slab_kmem_cache_release+0x3c/0x48
[ 151.859799][ T1650] kmem_cache_release+0x1c/0x28
[ 151.864507][ T1650] kobject_cleanup+0x134/0x288
[ 151.869127][ T1650] kobject_put+0x5c/0x68
[ 151.873226][ T1650] sysfs_slab_release+0x2c/0x38
[ 151.877931][ T1650] shutdown_cache+0x198/0x23c
[ 151.882464][ T1650] kmemcg_cache_shutdown_fn+0x1c/0x34
[ 151.887691][ T1650] kmemcg_workfn+0x44/0x68
[ 151.891963][ T1650] process_one_work+0x4e0/0xa54
[ 151.896668][ T1650] worker_thread+0x498/0x650
[ 151.901113][ T1650] kthread+0x1b8/0x1d4
[ 151.905037][ T1650] ret_from_fork+0x10/0x18
[ 151.909324][ T1650] INFO: Slab 0x00000000406d65a6 objects=64 used=64 fp=0x000000004d988e71 flags=0x7ffffffc000200
[ 151.919596][ T1650] INFO: Object 0x0000000040f4b79e @offset=15420325124116637824 fp=0x00000000e038adbf
[ 151.919596][ T1650]
[ 151.931079][ T1650] Redzone 00000000fc4c04f0: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.941168][ T1650] Redzone 000000009a25c019: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.951256][ T1650] Redzone 000000000b05c7cc: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.961345][ T1650] Redzone 00000000a08ae38b: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.971433][ T1650] Redzone 00000000e0eccd41: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.981520][ T1650] Redzone 0000000016ee2661: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 151.991608][ T1650] Redzone 000000009364e729: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 152.001695][ T1650] Redzone 00000000f2202456: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
[ 152.011784][ T1650] Object 0000000040f4b79e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.021783][ T1650] Object 000000002df21fec: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.031779][ T1650] Object 0000000041cf0887: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.041775][ T1650] Object 00000000bfb91e8f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.051770][ T1650] Object 00000000da315b1c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.061765][ T1650] Object 00000000b362de78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.071761][ T1650] Object 00000000ad4f72bf: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.081756][ T1650] Object 00000000aa32d346: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.091751][ T1650] Object 00000000ad1cf22c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.101746][ T1650] Object 000000001cee47e4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.111741][ T1650] Object 00000000418720ed: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.121736][ T1650] Object 00000000dee1c3f2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.131731][ T1650] Object 00000000a23397c1: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.141727][ T1650] Object 000000002ed01641: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.151721][ T1650] Object 00000000915ec720: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.161716][ T1650] Object 00000000915988c1: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.171711][ T1650] Object 000000004a0cc60f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.181707][ T1650] Object 0000000054a294c9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.191701][ T1650] Object 0000000054f61682: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.201697][ T1650] Object 0000000018d04328: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.211692][ T1650] Object 00000000703cf2c7: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.221687][ T1650] Object 000000004d3ac5d5: 6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 00 00 00 00 kkkkkkkk........
[ 152.231682][ T1650] Object 00000000726ce587: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.241676][ T1650] Object 00000000c709b64e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.251672][ T1650] Object 0000000044d6a5c6: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.261667][ T1650] Object 000000009c76a6a2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.271662][ T1650] Object 0000000033d01d12: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.281657][ T1650] Object 00000000c50ff26f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.291652][ T1650] Object 00000000ebc3aaae: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.301647][ T1650] Object 00000000a2072fe3: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 152.311641][ T1650] Object 000000003d5911a3: 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkk.
[ 152.320942][ T1650] Redzone 000000009a2feac1: bb bb bb bb bb bb bb bb ........
[ 152.330330][ T1650] Padding 00000000c1b3cb8b: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
[ 152.340412][ T1650] Padding 000000003715421a: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
[ 152.350493][ T1650] Padding 0000000066b51ba7: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
[ 152.360575][ T1650] Padding 00000000ca240306: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
[ 152.370657][ T1650] Padding 0000000014a2af5d: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
[ 152.380048][ T1650] CPU: 82 PID: 1650 Comm: kworker/82:1 Tainted: G B W 5.2.0-rc5-next-20190617 #18
[ 152.390216][ T1650] Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.0.9 03/01/2019
[ 152.400741][ T1650] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func
[ 152.407786][ T1650] Call trace:
[ 152.410926][ T1650] dump_backtrace+0x0/0x268
[ 152.415280][ T1650] show_stack+0x20/0x2c
[ 152.419287][ T1650] dump_stack+0xb4/0x108
[ 152.423384][ T1650] print_trailer+0x274/0x298
[ 152.427825][ T1650] check_bytes_and_report+0xc4/0x118
[ 152.432959][ T1650] check_object+0x2fc/0x36c
[ 152.437312][ T1650] alloc_debug_processing+0x154/0x240
[ 152.442532][ T1650] ___slab_alloc+0x710/0xa68
[ 152.446972][ T1650] kmem_cache_alloc+0x514/0x568
[ 152.451672][ T1650] create_cache+0x6c/0x1bc
[ 152.455938][ T1650] memcg_create_kmem_cache+0xfc/0x11c
[ 152.461158][ T1650] memcg_kmem_cache_create_func+0x40/0x170
[ 152.466814][ T1650] process_one_work+0x4e0/0xa54
[ 152.471515][ T1650] worker_thread+0x498/0x650
[ 152.475953][ T1650] kthread+0x1b8/0x1d4
[ 152.479872][ T1650] ret_from_fork+0x10/0x18
[ 152.484139][ T1650] FIX kmem_cache: Restoring 0x000000001fd6fdef-0x0000000007f6bb36=0x6b
[ 152.484139][ T1650]
[ 152.494395][ T1650] FIX kmem_cache: Marking all objects used