[syzbot ci] Re: Eliminate Dying Memory Cgroup

[syzbot ci <syzbot+cie7d8f1fc805fcd7a@syzkaller.appspotmail.com>]

syzbot ci has tested the following series

[v1] Eliminate Dying Memory Cgroup
https://lore.kernel.org/all/cover.1761658310.git.zhengqi.arch@bytedance.com
* [PATCH v1 01/26] mm: memcontrol: remove dead code of checking parent memory cgroup
* [PATCH v1 02/26] mm: workingset: use folio_lruvec() in workingset_refault()
* [PATCH v1 03/26] mm: rename unlock_page_lruvec_irq and its variants
* [PATCH v1 04/26] mm: vmscan: refactor move_folios_to_lru()
* [PATCH v1 05/26] mm: memcontrol: allocate object cgroup for non-kmem case
* [PATCH v1 06/26] mm: memcontrol: return root object cgroup for root memory cgroup
* [PATCH v1 07/26] mm: memcontrol: prevent memory cgroup release in get_mem_cgroup_from_folio()
* [PATCH v1 08/26] buffer: prevent memory cgroup release in folio_alloc_buffers()
* [PATCH v1 09/26] writeback: prevent memory cgroup release in writeback module
* [PATCH v1 10/26] mm: memcontrol: prevent memory cgroup release in count_memcg_folio_events()
* [PATCH v1 11/26] mm: page_io: prevent memory cgroup release in page_io module
* [PATCH v1 12/26] mm: migrate: prevent memory cgroup release in folio_migrate_mapping()
* [PATCH v1 13/26] mm: mglru: prevent memory cgroup release in mglru
* [PATCH v1 14/26] mm: memcontrol: prevent memory cgroup release in mem_cgroup_swap_full()
* [PATCH v1 15/26] mm: workingset: prevent memory cgroup release in lru_gen_eviction()
* [PATCH v1 16/26] mm: thp: prevent memory cgroup release in folio_split_queue_lock{_irqsave}()
* [PATCH v1 17/26] mm: workingset: prevent lruvec release in workingset_refault()
* [PATCH v1 18/26] mm: zswap: prevent lruvec release in zswap_folio_swapin()
* [PATCH v1 19/26] mm: swap: prevent lruvec release in swap module
* [PATCH v1 20/26] mm: workingset: prevent lruvec release in workingset_activation()
* [PATCH v1 21/26] mm: memcontrol: prepare for reparenting LRU pages for lruvec lock
* [PATCH v1 22/26] mm: vmscan: prepare for reparenting traditional LRU folios
* [PATCH v1 23/26] mm: vmscan: prepare for reparenting MGLRU folios
* [PATCH v1 24/26] mm: memcontrol: refactor memcg_reparent_objcgs()
* [PATCH v1 25/26] mm: memcontrol: eliminate the problem of dying memory cgroup for LRU folios
* [PATCH v1 26/26] mm: lru: add VM_WARN_ON_ONCE_FOLIO to lru maintenance helpers

and found the following issue:
WARNING in folio_memcg

Full report is available here:
https://ci.syzbot.org/series/0d48a77a-fb4f-485d-9fd6-086afd6fb650

***

WARNING in folio_memcg

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      b227c04932039bccc21a0a89cd6df50fa57e4716
arch:      amd64
compiler:  Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config:    https://ci.syzbot.org/builds/503d7034-ae99-44d1-8fb2-62e7ef5e1c7c/config
C repro:   https://ci.syzbot.org/findings/880c374a-1b49-436e-9be2-63d5e2c6b6ab/c_repro
syz repro: https://ci.syzbot.org/findings/880c374a-1b49-436e-9be2-63d5e2c6b6ab/syz_repro

exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0xe5674ec2, utbl_chksum : 0xe619d30d)
exFAT-fs (loop0): failed to load alloc-bitmap
exFAT-fs (loop0): failed to recognize exfat type
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5965 at ./include/linux/memcontrol.h:380 obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
WARNING: CPU: 1 PID: 5965 at ./include/linux/memcontrol.h:380 folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:434
Modules linked in:
CPU: 1 UID: 0 PID: 5965 Comm: syz.0.17 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:obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
RIP: 0010:folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:434
Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 5f c8 06 00 48 8b 03 5b 41 5c 41 5e 41 5f 5d e9 cf 89 2a 09 cc e8 a9 bb a0 ff 90 <0f> 0b 90 eb ca 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff ff
RSP: 0018:ffffc90003ec66b0 EFLAGS: 00010293
RAX: ffffffff821f4b57 RBX: ffff888108b31480 RCX: ffff88816be91d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88816be91d00 R09: 0000000000000002
R10: 00000000fffffff0 R11: 0000000000000000 R12: dffffc0000000000
R13: 00000000ffffffe4 R14: ffffea0006d5f840 R15: ffffea0006d5f870
FS:  000055555db87500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ee63fff CR3: 000000010c308000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 zswap_compress mm/zswap.c:900 [inline]
 zswap_store_page mm/zswap.c:1430 [inline]
 zswap_store+0xfa2/0x1f80 mm/zswap.c:1541
 swap_writeout+0x6e8/0xf20 mm/page_io.c:275
 writeout mm/vmscan.c:651 [inline]
 pageout mm/vmscan.c:699 [inline]
 shrink_folio_list+0x34ec/0x4c40 mm/vmscan.c:1418
 reclaim_folio_list+0xeb/0x500 mm/vmscan.c:2196
 reclaim_pages+0x454/0x520 mm/vmscan.c:2233
 madvise_cold_or_pageout_pte_range+0x1974/0x1d00 mm/madvise.c:565
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:224 [inline]
 walk_p4d_range mm/pagewalk.c:262 [inline]
 walk_pgd_range+0xfe9/0x1d40 mm/pagewalk.c:303
 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410
 walk_page_range_vma+0x393/0x440 mm/pagewalk.c:717
 madvise_pageout_page_range mm/madvise.c:624 [inline]
 madvise_pageout mm/madvise.c:649 [inline]
 madvise_vma_behavior+0x311f/0x3a10 mm/madvise.c:1352
 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1669
 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1885
 do_madvise+0x1bc/0x270 mm/madvise.c:1978
 __do_sys_madvise mm/madvise.c:1987 [inline]
 __se_sys_madvise mm/madvise.c:1985 [inline]
 __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fccac38efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd9cc58708 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fccac5e5fa0 RCX: 00007fccac38efc9
RDX: 0000000000000015 RSI: 7fffffffffffffff RDI: 0000200000000000
RBP: 00007fccac411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fccac5e5fa0 R14: 00007fccac5e5fa0 R15: 0000000000000003
 </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: syzbot@syzkaller.appspotmail.com

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