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Message-ID: <66ce325b-0b02-3ac0-009b-4e24ef6114c3@linux.alibaba.com>
Date: Fri, 12 Jul 2019 21:41:01 -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 7/12/19 12:12 PM, Yang Shi wrote:
>
>
> On 7/11/19 2:07 PM, Qian Cai wrote:
>> On Wed, 2019-07-10 at 17:16 -0700, Yang Shi wrote:
>>> Hi Qian,
>>>
>>>
>>> Thanks for reporting the issue. But, I can't reproduce it on my
>>> machine.
>>> Could you please share more details about your test? How often did you
>>> run into this problem?
>> I can almost reproduce it every time on a HPE ProLiant DL385 Gen10
>> server. Here
>> is some more information.
>>
>> # cat .config
>>
>> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
>
> I tried your kernel config, but I still can't reproduce it. My
> compiler doesn't have retpoline support, so CONFIG_RETPOLINE is
> disabled in my test, but I don't think this would make any difference
> for this case.
>
> According to the bug call trace in the earlier email, it looks
> deferred _split_scan lost race with put_compound_page. The
> put_compound_page would call free_transhuge_page() which delete the
> page from the deferred split queue, but it may still appear on the
> deferred list due to some reason.
>
> Would you please try the below patch?
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index b7f709d..66bd9db 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2765,7 +2765,7 @@ int split_huge_page_to_list(struct page *page,
> struct list_head *list)
> if (!mapcount && page_ref_freeze(head, 1 + extra_pins)) {
> if (!list_empty(page_deferred_list(head))) {
> ds_queue->split_queue_len--;
> - list_del(page_deferred_list(head));
> + list_del_init(page_deferred_list(head));
This line should not be changed. Please just apply the below part.
> }
> if (mapping)
> __dec_node_page_state(page, NR_SHMEM_THPS);
> @@ -2814,7 +2814,7 @@ void free_transhuge_page(struct page *page)
> spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
> if (!list_empty(page_deferred_list(page))) {
> ds_queue->split_queue_len--;
> - list_del(page_deferred_list(page));
> + list_del_init(page_deferred_list(page));
> }
> spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
> free_compound_page(page);
>
>>
>> # numactl -H
>> available: 8 nodes (0-7)
>> node 0 cpus: 0 1 2 3 4 5 6 7 64 65 66 67 68 69 70 71
>> node 0 size: 19984 MB
>> node 0 free: 7251 MB
>> node 1 cpus: 8 9 10 11 12 13 14 15 72 73 74 75 76 77 78 79
>> node 1 size: 0 MB
>> node 1 free: 0 MB
>> node 2 cpus: 16 17 18 19 20 21 22 23 80 81 82 83 84 85 86 87
>> node 2 size: 0 MB
>> node 2 free: 0 MB
>> node 3 cpus: 24 25 26 27 28 29 30 31 88 89 90 91 92 93 94 95
>> node 3 size: 0 MB
>> node 3 free: 0 MB
>> node 4 cpus: 32 33 34 35 36 37 38 39 96 97 98 99 100 101 102 103
>> node 4 size: 31524 MB
>> node 4 free: 25165 MB
>> node 5 cpus: 40 41 42 43 44 45 46 47 104 105 106 107 108 109 110 111
>> node 5 size: 0 MB
>> node 5 free: 0 MB
>> node 6 cpus: 48 49 50 51 52 53 54 55 112 113 114 115 116 117 118 119
>> node 6 size: 0 MB
>> node 6 free: 0 MB
>> node 7 cpus: 56 57 58 59 60 61 62 63 120 121 122 123 124 125 126 127
>> node 7 size: 0 MB
>> node 7 free: 0 MB
>> node distances:
>> node 0 1 2 3 4 5 6 7
>> 0: 10 16 16 16 32 32 32 32
>> 1: 16 10 16 16 32 32 32 32
>> 2: 16 16 10 16 32 32 32 32
>> 3: 16 16 16 10 32 32 32 32
>> 4: 32 32 32 32 10 16 16 16
>> 5: 32 32 32 32 16 10 16 16
>> 6: 32 32 32 32 16 16 10 16
>> 7: 32 32 32 32 16 16 16 10
>>
>> # lscpu
>> Architecture: x86_64
>> CPU op-mode(s): 32-bit, 64-bit
>> Byte Order: Little Endian
>> CPU(s): 128
>> On-line CPU(s) list: 0-127
>> Thread(s) per core: 2
>> Core(s) per socket: 32
>> Socket(s): 2
>> NUMA node(s): 8
>> Vendor ID: AuthenticAMD
>> CPU family: 23
>> Model: 1
>> Model name: AMD EPYC 7601 32-Core Processor
>> Stepping: 2
>> CPU MHz: 2713.551
>> BogoMIPS: 4391.39
>> Virtualization: AMD-V
>> L1d cache: 32K
>> L1i cache: 64K
>> L2 cache: 512K
>> L3 cache: 8192K
>> NUMA node0 CPU(s): 0-7,64-71
>> NUMA node1 CPU(s): 8-15,72-79
>> NUMA node2 CPU(s): 16-23,80-87
>> NUMA node3 CPU(s): 24-31,88-95
>> NUMA node4 CPU(s): 32-39,96-103
>> NUMA node5 CPU(s): 40-47,104-111
>> NUMA node6 CPU(s): 48-55,112-119
>> NUMA node7 CPU(s): 56-63,120-127
>>
>> 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:
>
> 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
>>
>>>
>>> Regards,
>>>
>>> Yang
>>>
>>>
>>>
>>> On 7/10/19 2:43 PM, Qian Cai wrote:
>>>> Running LTP oom01 test case with swap triggers a crash below.
>>>> Revert the
>>>> series
>>>> "Make deferred split shrinker memcg aware" [1] seems fix the issue.
>>>>
>>>> aefde94195ca mm: thp: make deferred split shrinker memcg aware
>>>> cf402211cacc
>>>> mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2-fix
>>>> ca37e9e5f18d mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2
>>>> 5f419d89cab4 mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix
>>>> c9d49e69e887 mm: shrinker: make shrinker not depend on memcg kmem
>>>> 1c0af4b86bcf mm: move mem_cgroup_uncharge out of
>>>> __page_cache_release()
>>>> 4e050f2df876 mm: thp: extract split_queue_* into a struct
>>>>
>>>> [1]
>>>> https://lore.kernel.org/linux-mm/1561507361-59349-1-git-send-email-yang.
>>>>
>>>> shi@
>>>> linux.alibaba.com/
>>>>
>>>> [ 1145.730682][ T5764] list_del corruption, ffffea00251c8098->next is
>>>> LIST_POISON1 (dead000000000100)
>>>> [ 1145.739763][ T5764] ------------[ cut here ]------------
>>>> [ 1145.745126][ T5764] kernel BUG at lib/list_debug.c:47!
>>>> [ 1145.750320][ T5764] invalid opcode: 0000 [#1] SMP
>>>> DEBUG_PAGEALLOC KASAN
>>>> NOPTI
>>>> [ 1145.757513][ T5764] CPU: 1 PID: 5764 Comm: oom01 Tainted:
>>>> G W 5.2.0-next-20190710+ #7
>>>> [ 1145.766709][ T5764] Hardware name: HPE ProLiant DL385
>>>> Gen10/ProLiant
>>>> DL385
>>>> Gen10, BIOS A40 01/25/2019
>>>> [ 1145.776000][ T5764] RIP:
>>>> 0010:__list_del_entry_valid.cold.0+0x12/0x4a
>>>> [ 1145.782491][ T5764] Code: c7 40 5a 33 af e8 ac fe bc ff 0f 0b 48
>>>> c7 c7 80
>>>> 9e
>>>> a1 af e8 f6 4c 01 00 4c 89 ea 48 89 de 48 c7 c7 20 59 33 af e8 8c
>>>> fe bc ff
>>>> <0f>
>>>> 0b 48 c7 c7 40 9f a1 af e8 d6 4c 01 00 4c 89 e2 48 89 de 48 c7
>>>> [ 1145.802078][ T5764] RSP: 0018:ffff888514d773c0 EFLAGS: 00010082
>>>> [ 1145.808042][ T5764] RAX: 000000000000004e RBX: ffffea00251c8098
>>>> RCX:
>>>> ffffffffae95d318
>>>> [ 1145.815923][ T5764] RDX: 0000000000000000 RSI: 0000000000000008
>>>> RDI:
>>>> ffff8888440bd380
>>>> [ 1145.823806][ T5764] RBP: ffff888514d773d8 R08: ffffed1108817a71
>>>> R09:
>>>> ffffed1108817a70
>>>> [ 1145.831689][ T5764] R10: ffffed1108817a70 R11: ffff8888440bd387
>>>> R12:
>>>> dead000000000122
>>>> [ 1145.839571][ T5764] R13: dead000000000100 R14: ffffea00251c8034
>>>> R15:
>>>> dead000000000100
>>>> [ 1145.847455][ T5764] FS: 00007f765ad4d700(0000)
>>>> GS:ffff888844080000(0000)
>>>> knlGS:0000000000000000
>>>> [ 1145.856299][ T5764] CS: 0010 DS: 0000 ES: 0000 CR0:
>>>> 0000000080050033
>>>> [ 1145.862784][ T5764] CR2: 00007f8cebec7000 CR3: 0000000459338000
>>>> CR4:
>>>> 00000000001406a0
>>>> [ 1145.870664][ T5764] Call Trace:
>>>> [ 1145.873835][ T5764] deferred_split_scan+0x337/0x740
>>>> [ 1145.878835][ T5764] ? split_huge_page_to_list+0xe30/0xe30
>>>> [ 1145.884364][ T5764] ? __radix_tree_lookup+0x12d/0x1e0
>>>> [ 1145.889539][ T5764] ? node_tag_get.part.0.constprop.6+0x40/0x40
>>>> [ 1145.895592][ T5764] do_shrink_slab+0x244/0x5a0
>>>> [ 1145.900159][ T5764] shrink_slab+0x253/0x440
>>>> [ 1145.904462][ T5764] ? unregister_shrinker+0x110/0x110
>>>> [ 1145.909641][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1145.914383][ T5764] ? mem_cgroup_protected+0x20f/0x260
>>>> [ 1145.919645][ T5764] shrink_node+0x31e/0xa30
>>>> [ 1145.923949][ T5764] ? shrink_node_memcg+0x1560/0x1560
>>>> [ 1145.929126][ T5764] ? ktime_get+0x93/0x110
>>>> [ 1145.933340][ T5764] do_try_to_free_pages+0x22f/0x820
>>>> [ 1145.938429][ T5764] ? shrink_node+0xa30/0xa30
>>>> [ 1145.942906][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1145.947647][ T5764] ? check_chain_key+0x1df/0x2e0
>>>> [ 1145.952474][ T5764] try_to_free_pages+0x242/0x4d0
>>>> [ 1145.957299][ T5764] ? do_try_to_free_pages+0x820/0x820
>>>> [ 1145.962566][ T5764] __alloc_pages_nodemask+0x9ce/0x1bc0
>>>> [ 1145.967917][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1145.972657][ T5764] ? gfp_pfmemalloc_allowed+0xc0/0xc0
>>>> [ 1145.977920][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1145.982659][ T5764] ? check_chain_key+0x1df/0x2e0
>>>> [ 1145.987487][ T5764] ? do_anonymous_page+0x343/0xe30
>>>> [ 1145.992489][ T5764] ? lock_downgrade+0x390/0x390
>>>> [ 1145.997230][ T5764] ? __count_memcg_events+0x8b/0x1c0
>>>> [ 1146.002404][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1146.007145][ T5764] ? __lru_cache_add+0x122/0x160
>>>> [ 1146.011974][ T5764] alloc_pages_vma+0x89/0x2c0
>>>> [ 1146.016538][ T5764] do_anonymous_page+0x3e1/0xe30
>>>> [ 1146.021367][ T5764] ? __update_load_avg_cfs_rq+0x2c/0x490
>>>> [ 1146.026893][ T5764] ? finish_fault+0x120/0x120
>>>> [ 1146.031461][ T5764] ? call_function_interrupt+0xa/0x20
>>>> [ 1146.036724][ T5764] handle_pte_fault+0x457/0x12c0
>>>> [ 1146.041552][ T5764] __handle_mm_fault+0x79a/0xa50
>>>> [ 1146.046378][ T5764] ? vmf_insert_mixed_mkwrite+0x20/0x20
>>>> [ 1146.051817][ T5764] ? kasan_check_read+0x11/0x20
>>>> [ 1146.056557][ T5764] ? __count_memcg_events+0x8b/0x1c0
>>>> [ 1146.061732][ T5764] handle_mm_fault+0x17f/0x370
>>>> [ 1146.066386][ T5764] __do_page_fault+0x25b/0x5d0
>>>> [ 1146.071037][ T5764] do_page_fault+0x4c/0x2cf
>>>> [ 1146.075426][ T5764] ? page_fault+0x5/0x20
>>>> [ 1146.079553][ T5764] page_fault+0x1b/0x20
>>>> [ 1146.083594][ T5764] RIP: 0033:0x410be0
>>>> [ 1146.087373][ T5764] Code: 89 de e8 e3 23 ff ff 48 83 f8 ff 0f 84
>>>> 86 00 00
>>>> 00
>>>> 48 89 c5 41 83 fc 02 74 28 41 83 fc 03 74 62 e8 95 29 ff ff 31 d2
>>>> 48 98 90
>>>> <c6>
>>>> 44 15 00 07 48 01 c2 48 39 d3 7f f3 31 c0 5b 5d 41 5c c3 0f 1f
>>>> [ 1146.106959][ T5764] RSP: 002b:00007f765ad4cec0 EFLAGS: 00010206
>>>> [ 1146.112921][ T5764] RAX: 0000000000001000 RBX: 00000000c0000000
>>>> RCX:
>>>> 00007f98f2674497
>>>> [ 1146.120804][ T5764] RDX: 0000000001d95000 RSI: 00000000c0000000
>>>> RDI:
>>>> 0000000000000000
>>>> [ 1146.128687][ T5764] RBP: 00007f74d9d4c000 R08: 00000000ffffffff
>>>> R09:
>>>> 0000000000000000
>>>> [ 1146.136569][ T5764] R10: 0000000000000022 R11: 000000000[
>>>> 1147.588181][
>>>> T5764] Shutting down cpus with NMI
>>>> [ 1147.592756][ T5764] Kernel Offset: 0x2d400000 from
>>>> 0xffffffff81000000
>>>> (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
>>>> [ 1147.604414][ T5764] ---[ end Kernel panic - not syncing: Fatal
>>>> exception
>>>> ]---
>>>
>
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