[syzbot ci] Re: mm/memcontrol: introduce per-tier memory accounting and control

[syzbot ci]

syzbot ci has tested the following series

[v1] mm/memcontrol: introduce per-tier memory accounting and control
https://lore.kernel.org/all/20260818023121....@kylinos.cn
* [RFC PATCH 1/8] mm/memory-tiers: add node_to_tier_id and tier_id_to_nodemask
* [RFC PATCH 2/8] mm/vmscan: add try_to_free_mem_cgroup_pages_nodemask
* [RFC PATCH 3/8] mm/memcontrol: add per-tier page counter infrastructure and lifecycle
* [RFC PATCH 4/8] mm/memcontrol: add per-tier charge and uncharge
* [RFC PATCH 5/8] mm/memcontrol: add per-cpu stock for tier charge/uncharge
* [RFC PATCH 6/8] mm/memcontrol: add memory.tier control file
* [RFC PATCH 7/8] mm/memcontrol: auto-derive tier high/max from memory.high/max
* [RFC PATCH 8/8] cgroup: add memory_tiered_limits cgroup mount option

and found the following issue:
WARNING in uncharge_folio

Full report is available here:
https://ci.syzbot.org/series/9db711d8-d389-45d1-b245-7e8b316a8432

***

WARNING in uncharge_folio

tree: torvalds
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base: dcacab904fe78d60840ba947a104993ee9ded887
arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
config: https://ci.syzbot.org/builds/bf213e6f-1b40-41fa-a938-385807688eec/config

------------[ cut here ]------------
debug_locks && !(rcu_read_lock_held() || lock_is_held(&(&cgroup_mutex)->dep_map))
WARNING: ./include/linux/memcontrol.h:391 at uncharge_folio+0x459/0x5b0, CPU#1: udevd/5681
Modules linked in:
CPU: 1 UID: 0 PID: 5681 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:uncharge_folio+0x459/0x5b0
Code: c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8b 3c 24 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 88 79 00 00 90 <0f> 0b 90 e9 c9 fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 fc
RSP: 0018:ffffc90004ff7210 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90004ff72a0 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e4a6d0d RDI: ffffffff8c4bb280
RBP: ffffc90004ff72a8 R08: ffffea0006e7a7c7 R09: 1ffffd4000dcf4f8
R10: dffffc0000000000 R11: fffff94000dcf4f9 R12: ffffea0006e7a7f8
R13: 1ffffd4000dcf4f8 R14: 0000000000000001 R15: ffffea0006e7a7c0
FS: 00007f1ec7ce0c80(0000) GS:ffff8882a8f6a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0cdf670000 CR3: 000000017358a000 CR4: 00000000000006f0
Call Trace:
<TASK>
__mem_cgroup_uncharge_folios+0xfd/0x1d0
folio_batch_move_lru+0x86f/0xa60
lru_add_drain_cpu+0xbc/0x750
lru_add_drain+0x121/0x3e0
__folio_batch_release+0x48/0x90
shmem_undo_range+0x4e6/0x15d0
shmem_evict_inode+0x280/0xa80
evict+0x624/0xb50
dentry_kill+0x1b9/0x880
finish_dput+0x1a/0x260
filename_renameat2+0x61b/0x9a0
__se_sys_rename+0x55/0x2c0
do_syscall_64+0x174/0x580
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ec789a93b
Code: 48 8b 15 f0 64 15 00 83 c8 ff 64 83 3a 15 75 0e 48 8b 7c 24 08 e8 d5 d4 07 00 f7 d8 19 c0 48 83 c4 18 c3 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 be 64 15 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffcb336cd08 EFLAGS: 00000202 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1ec789a93b
RDX: 0000558c622ea032 RSI: 00007ffcb336cd28 RDI: 00007ffcb336d128
RBP: 000055893abc0910 R08: 0000000000000006 R09: f80f8ce6f311cb22
R10: 00000000000001b6 R11: 0000000000000202 R12: 000055893aba2730
R13: 00007ffcb336cd28 R14: 00007ffcb336d128 R15: 0000558926efb160
</TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com

---
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