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Date: Mon, 15 Jul 2019 17:22:00 -0700
From: Yang Shi <yang.shi@...ux.alibaba.com>
To: Qian Cai <cai@....pw>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
akpm@...ux-foundation.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: list corruption in deferred_split_scan()
On 7/15/19 2:23 PM, Qian Cai wrote:
> On Fri, 2019-07-12 at 12:12 -0700, Yang Shi wrote:
>>> Another possible lead is that without reverting the those commits below,
>>> kdump
>>> kernel would always also crash in shrink_slab_memcg() at this line,
>>>
>>> map = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_map, true);
>> This looks a little bit weird. It seems nodeinfo[nid] is NULL? I didn't
>> think of where nodeinfo was freed but memcg was still online. Maybe a
>> check is needed:
> Actually, "memcg" is NULL.
It sounds weird. shrink_slab() is called in mem_cgroup_iter which does
pin the memcg. So, the memcg should not go away.
>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index a0301ed..bacda49 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -602,6 +602,9 @@ static unsigned long shrink_slab_memcg(gfp_t
>> gfp_mask, int nid,
>> if (!mem_cgroup_online(memcg))
>> return 0;
>>
>> + if (!memcg->nodeinfo[nid])
>> + return 0;
>> +
>> if (!down_read_trylock(&shrinker_rwsem))
>> return 0;
>>
>>> [ 9.072036][ T1] BUG: KASAN: null-ptr-deref in shrink_slab+0x111/0x440
>>> [ 9.072036][ T1] Read of size 8 at addr 0000000000000dc8 by task
>>> swapper/0/1
>>> [ 9.072036][ T1]
>>> [ 9.072036][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-next-
>>> 20190711+ #10
>>> [ 9.072036][ T1] Hardware name: HPE ProLiant DL385 Gen10/ProLiant
>>> DL385
>>> Gen10, BIOS A40 01/25/2019
>>> [ 9.072036][ T1] Call Trace:
>>> [ 9.072036][ T1] dump_stack+0x62/0x9a
>>> [ 9.072036][ T1] __kasan_report.cold.4+0xb0/0xb4
>>> [ 9.072036][ T1] ? unwind_get_return_address+0x40/0x50
>>> [ 9.072036][ T1] ? shrink_slab+0x111/0x440
>>> [ 9.072036][ T1] kasan_report+0xc/0xe
>>> [ 9.072036][ T1] __asan_load8+0x71/0xa0
>>> [ 9.072036][ T1] shrink_slab+0x111/0x440
>>> [ 9.072036][ T1] ? mem_cgroup_iter+0x98/0x840
>>> [ 9.072036][ T1] ? unregister_shrinker+0x110/0x110
>>> [ 9.072036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.072036][ T1] ? mem_cgroup_protected+0x39/0x260
>>> [ 9.072036][ T1] shrink_node+0x31e/0xa30
>>> [ 9.072036][ T1] ? shrink_node_memcg+0x1560/0x1560
>>> [ 9.072036][ T1] ? ktime_get+0x93/0x110
>>> [ 9.072036][ T1] do_try_to_free_pages+0x22f/0x820
>>> [ 9.072036][ T1] ? shrink_node+0xa30/0xa30
>>> [ 9.072036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.072036][ T1] ? check_chain_key+0x1df/0x2e0
>>> [ 9.072036][ T1] try_to_free_pages+0x242/0x4d0
>>> [ 9.072036][ T1] ? do_try_to_free_pages+0x820/0x820
>>> [ 9.072036][ T1] __alloc_pages_nodemask+0x9ce/0x1bc0
>>> [ 9.072036][ T1] ? gfp_pfmemalloc_allowed+0xc0/0xc0
>>> [ 9.072036][ T1] ? unwind_dump+0x260/0x260
>>> [ 9.072036][ T1] ? kernel_text_address+0x33/0xc0
>>> [ 9.072036][ T1] ? arch_stack_walk+0x8f/0xf0
>>> [ 9.072036][ T1] ? ret_from_fork+0x22/0x40
>>> [ 9.072036][ T1] alloc_page_interleave+0x18/0x130
>>> [ 9.072036][ T1] alloc_pages_current+0xf6/0x110
>>> [ 9.072036][ T1] allocate_slab+0x600/0x11f0
>>> [ 9.072036][ T1] new_slab+0x46/0x70
>>> [ 9.072036][ T1] ___slab_alloc+0x5d4/0x9c0
>>> [ 9.072036][ T1] ? create_object+0x3a/0x3e0
>>> [ 9.072036][ T1] ? fs_reclaim_acquire.part.15+0x5/0x30
>>> [ 9.072036][ T1] ? ___might_sleep+0xab/0xc0
>>> [ 9.072036][ T1] ? create_object+0x3a/0x3e0
>>> [ 9.072036][ T1] __slab_alloc+0x12/0x20
>>> [ 9.072036][ T1] ? __slab_alloc+0x12/0x20
>>> [ 9.072036][ T1] kmem_cache_alloc+0x32a/0x400
>>> [ 9.072036][ T1] create_object+0x3a/0x3e0
>>> [ 9.072036][ T1] kmemleak_alloc+0x71/0xa0
>>> [ 9.072036][ T1] kmem_cache_alloc+0x272/0x400
>>> [ 9.072036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.072036][ T1] ? do_raw_spin_unlock+0xa8/0x140
>>> [ 9.072036][ T1] acpi_ps_alloc_op+0x76/0x122
>>> [ 9.072036][ T1] acpi_ds_execute_arguments+0x2f/0x18d
>>> [ 9.072036][ T1] acpi_ds_get_package_arguments+0x7d/0x84
>>> [ 9.072036][ T1] acpi_ns_init_one_package+0x33/0x61
>>> [ 9.072036][ T1] acpi_ns_init_one_object+0xfc/0x189
>>> [ 9.072036][ T1] acpi_ns_walk_namespace+0x114/0x1f2
>>> [ 9.072036][ T1] ? acpi_ns_init_one_package+0x61/0x61
>>> [ 9.072036][ T1] ? acpi_ns_init_one_package+0x61/0x61
>>> [ 9.072036][ T1] acpi_walk_namespace+0x9e/0xcb
>>> [ 9.072036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.072036][ T1] acpi_ns_initialize_objects+0x99/0xed
>>> [ 9.072036][ T1] ? acpi_ns_find_ini_methods+0xa2/0xa2
>>> [ 9.072036][ T1] ? acpi_tb_load_namespace+0x2dc/0x2eb
>>> [ 9.072036][ T1] acpi_load_tables+0x61/0x80
>>> [ 9.072036][ T1] acpi_init+0x10d/0x44b
>>> [ 9.072036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.072036][ T1] ? bus_uevent_filter+0x16/0x30
>>> [ 9.072036][ T1] ? kobject_uevent_env+0x109/0x980
>>> [ 9.072036][ T1] ? kernfs_get+0x13/0x20
>>> [ 9.072036][ T1] ? kobject_uevent+0xb/0x10
>>> [ 9.072036][ T1] ? kset_register+0x31/0x50
>>> [ 9.072036][ T1] ? kset_create_and_add+0x9f/0xd0
>>> [ 9.072036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.072036][ T1] do_one_initcall+0xfe/0x45a
>>> [ 9.072036][ T1] ? initcall_blacklisted+0x150/0x150
>>> [ 9.072036][ T1] ? rwsem_down_read_slowpath+0x930/0x930
>>> [ 9.072036][ T1] ? kasan_check_write+0x14/0x20
>>> [ 9.072036][ T1] ? up_write+0x6b/0x190
>>> [ 9.072036][ T1] kernel_init_freeable+0x614/0x6a7
>>> [ 9.072036][ T1] ? rest_init+0x188/0x188
>>> [ 9.072036][ T1] kernel_init+0x11/0x138
>>> [ 9.072036][ T1] ? rest_init+0x188/0x188
>>> [ 9.072036][ T1] ret_from_fork+0x22/0x40
>>> [ 9.072036][ T1]
>>> ==================================================================
>>> [ 9.072036][ T1] Disabling lock debugging due to kernel taint
>>> [ 9.145712][ T1] BUG: kernel NULL pointer dereference, address:
>>> 0000000000000dc8
>>> [ 9.152036][ T1] #PF: supervisor read access in kernel mode
>>> [ 9.152036][ T1] #PF: error_code(0x0000) - not-present page
>>> [ 9.152036][ T1] PGD 0 P4D 0
>>> [ 9.152036][ T1] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
>>> [ 9.152036][ T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted:
>>> G B 5.2.0-next-20190711+ #10
>>> [ 9.152036][ T1] Hardware name: HPE ProLiant DL385 Gen10/ProLiant
>>> DL385
>>> Gen10, BIOS A40 01/25/2019
>>> [ 9.152036][ T1] RIP: 0010:shrink_slab+0x111/0x440
>>> [ 9.152036][ T1] Code: c7 20 8d 44 82 e8 7f 8b e8 ff 85 c0 0f 84 e2 02
>>> 00
>>> 00 4c 63 a5 4c ff ff ff 49 81 c4 b8 01 00 00 4b 8d 7c e6 08 e8 3f 07 0e 00
>>> <4f>
>>> 8b 64 e6 08 49 8d bc 24 20 03 00 00 e8 2d 07 0e 00 49 8b 84 24
>>> [ 9.152036][ T1] RSP: 0018:ffff88905757f100 EFLAGS: 00010282
>>> [ 9.152036][ T1] RAX: 0000000000000000 RBX: ffff88905757f1b0 RCX:
>>> ffffffff8112f288
>>> [ 9.152036][ T1] RDX: 1ffffffff049c088 RSI: dffffc0000000000 RDI:
>>> ffffffff824e0440
>>> [ 9.152036][ T1] RBP: ffff88905757f1d8 R08: fffffbfff049c089 R09:
>>> fffffbfff049c088
>>> [ 9.152036][ T1] R10: fffffbfff049c088 R11: ffffffff824e0443 R12:
>>> 00000000000001b8
>>> [ 9.152036][ T1] R13: 0000000000000000 R14: 0000000000000000 R15:
>>> ffff88905757f440
>>> [ 9.152036][ T1] FS: 0000000000000000(0000) GS:ffff889062800000(0000)
>>> knlGS:0000000000000000
>>> [ 9.152036][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 9.152036][ T1] CR2: 0000000000000dc8 CR3: 0000001070212000 CR4:
>>> 00000000001406b0
>>> [ 9.152036][ T1] Call Trace:
>>> [ 9.152036][ T1] ? mem_cgroup_iter+0x98/0x840
>>> [ 9.152036][ T1] ? unregister_shrinker+0x110/0x110
>>> [ 9.152036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.152036][ T1] ? mem_cgroup_protected+0x39/0x260
>>> [ 9.152036][ T1] shrink_node+0x31e/0xa30
>>> [ 9.152036][ T1] ? shrink_node_memcg+0x1560/0x1560
>>> [ 9.152036][ T1] ? ktime_get+0x93/0x110
>>> [ 9.152036][ T1] do_try_to_free_pages+0x22f/0x820
>>> [ 9.152036][ T1] ? shrink_node+0xa30/0xa30
>>> [ 9.152036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.152036][ T1] ? check_chain_key+0x1df/0x2e0
>>> [ 9.152036][ T1] try_to_free_pages+0x242/0x4d0
>>> [ 9.152036][ T1] ? do_try_to_free_pages+0x820/0x820
>>> [ 9.152036][ T1] __alloc_pages_nodemask+0x9ce/0x1bc0
>>> [ 9.152036][ T1] ? gfp_pfmemalloc_allowed+0xc0/0xc0
>>> [ 9.152036][ T1] ? unwind_dump+0x260/0x260
>>> [ 9.152036][ T1] ? kernel_text_address+0x33/0xc0
>>> [ 9.152036][ T1] ? arch_stack_walk+0x8f/0xf0
>>> [ 9.152036][ T1] ? ret_from_fork+0x22/0x40
>>> [ 9.152036][ T1] alloc_page_interleave+0x18/0x130
>>> [ 9.152036][ T1] alloc_pages_current+0xf6/0x110
>>> [ 9.152036][ T1] allocate_slab+0x600/0x11f0
>>> [ 9.152036][ T1] new_slab+0x46/0x70
>>> [ 9.152036][ T1] ___slab_alloc+0x5d4/0x9c0
>>> [ 9.152036][ T1] ? create_object+0x3a/0x3e0
>>> [ 9.152036][ T1] ? fs_reclaim_acquire.part.15+0x5/0x30
>>> [ 9.152036][ T1] ? ___might_sleep+0xab/0xc0
>>> [ 9.152036][ T1] ? create_object+0x3a/0x3e0
>>> [ 9.152036][ T1] __slab_alloc+0x12/0x20
>>> [ 9.152036][ T1] ? __slab_alloc+0x12/0x20
>>> [ 9.152036][ T1] kmem_cache_alloc+0x32a/0x400
>>> [ 9.152036][ T1] create_object+0x3a/0x3e0
>>> [ 9.152036][ T1] kmemleak_alloc+0x71/0xa0
>>> [ 9.152036][ T1] kmem_cache_alloc+0x272/0x400
>>> [ 9.152036][ T1] ? kasan_check_read+0x11/0x20
>>> [ 9.152036][ T1] ? do_raw_spin_unlock+0xa8/0x140
>>> [ 9.152036][ T1] acpi_ps_alloc_op+0x76/0x122
>>> [ 9.152036][ T1] acpi_ds_execute_arguments+0x2f/0x18d
>>> [ 9.152036][ T1] acpi_ds_get_package_arguments+0x7d/0x84
>>> [ 9.152036][ T1] acpi_ns_init_one_package+0x33/0x61
>>> [ 9.152036][ T1] acpi_ns_init_one_object+0xfc/0x189
>>> [ 9.152036][ T1] acpi_ns_walk_namespace+0x114/0x1f2
>>> [ 9.152036][ T1] ? acpi_ns_init_one_package+0x61/0x61
>>> [ 9.152036][ T1] ? acpi_ns_init_one_package+0x61/0x61
>>> [ 9.152036][ T1] acpi_walk_namespace+0x9e/0xcb
>>> [ 9.152036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.152036][ T1] acpi_ns_initialize_objects+0x99/0xed
>>> [ 9.152036][ T1] ? acpi_ns_find_ini_methods+0xa2/0xa2
>>> [ 9.152036][ T1] ? acpi_tb_load_namespace+0x2dc/0x2eb
>>> [ 9.152036][ T1] acpi_load_tables+0x61/0x80
>>> [ 9.152036][ T1] acpi_init+0x10d/0x44b
>>> [ 9.152036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.152036][ T1] ? bus_uevent_filter+0x16/0x30
>>> [ 9.152036][ T1] ? kobject_uevent_env+0x109/0x980
>>> [ 9.152036][ T1] ? kernfs_get+0x13/0x20
>>> [ 9.152036][ T1] ? kobject_uevent+0xb/0x10
>>> [ 9.152036][ T1] ? kset_register+0x31/0x50
>>> [ 9.152036][ T1] ? kset_create_and_add+0x9f/0xd0
>>> [ 9.152036][ T1] ? acpi_sleep_proc_init+0x36/0x36
>>> [ 9.152036][ T1] do_one_initcall+0xfe/0x45a
>>> [ 9.152036][ T1] ? initcall_blacklisted+0x150/0x150
>>> [ 9.152036][ T1] ? rwsem_down_read_slowpath+0x930/0x930
>>> [ 9.152036][ T1] ? kasan_check_write+0x14/0x20
>>> [ 9.152036][ T1] ? up_write+0x6b/0x190
>>> [ 9.152036][ T1] kernel_init_freeable+0x614/0x6a7
>>> [ 9.152036][ T1] ? rest_init+0x188/0x188
>>> [ 9.152036][ T1] kernel_init+0x11/0x138
>>> [ 9.152036][ T1] ? rest_init+0x188/0x188
>>> [ 9.152036][ T1] ret_from_fork+0x22/0x40
>>> [ 9.152036][ T1] Modules linked in:
>>> [ 9.152036][ T1] CR2: 0000000000000dc8
>>> [ 9.152036][ T1] ---[ end trace 568acce4eca01945 ]---
>>> [ 9.152036][ T1] RIP: 0010:shrink_slab+0x111/0x440
>>> [ 9.152036][ T1] Code: c7 20 8d 44 82 e8 7f 8b e8 ff 85 c0 0f 84 e2 02
>>> 00
>>> 00 4c 63 a5 4c ff ff ff 49 81 c4 b8 01 00 00 4b 8d 7c e6 08 e8 3f 07 0e 00
>>> <4f>
>>> 8b 64 e6 08 49 8d bc 24 20 03 00 00 e8 2d 07 0e 00 49 8b 84 24
>>> [ 9.152036][ T1] RSP: 0018:ffff88905757f100 EFLAGS: 00010282
>>> [ 9.152036][ T1] RAX: 0000000000000000 RBX: ffff88905757f1b0 RCX:
>>> ffffffff8112f288
>>> [ 9.152036][ T1] RDX: 1ffffffff049c088 RSI: dffffc0000000000 RDI:
>>> ffffffff824e0440
>>> [ 9.152036][ T1] RBP: ffff88905757f1d8 R08: fffffbfff049c089 R09:
>>> fffffbfff049c088
>>> [ 9.152036][ T1] R10: fffffbfff049c088 R11: ffffffff824e0443 R12:
>>> 00000000000001b8
>>> [ 9.152036][ T1] R13: 0000000000000000 R14: 0000000000000000 R15:
>>> ffff88905757f440
>>> [ 9.152036][ T1] FS: 0000000000000000(0000) GS:ffff889062800000(0000)
>>> knlGS:00000000
>>>
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