[syzbot ci] Re: Zero page->private when freeing pages

[syzbot ci]

syzbot ci has tested the following series

[v1] Zero page->private when freeing pages
https://lore.kernel.org/all/20260223032641...@nvidia.com
* [PATCH v1 01/11] relay: zero page->private when freeing pages
* [PATCH v1 02/11] mm/slub: zero page->private when freeing pages
* [PATCH v1 03/11] drm/ttm: zero page->private when freeing pages
* [PATCH v1 04/11] blk-mq: zero page->private when freeing pages
* [PATCH v1 05/11] watch_queue: zero page->private when freeing pages
* [PATCH v1 06/11] binder: zero page->private when freeing pages
* [PATCH v1 07/11] null_blk: zero page->private when freeing pages
* [PATCH v1 08/11] percpu: zero page->private when freeing pages
* [PATCH v1 09/11] erofs: zero page->private when freeing pages
* [PATCH v1 10/11] mm/huge_memory: add page->private check back in __split_folio_to_order()
* [PATCH v1 11/11] mm/page_alloc: check page->private upon page free

and found the following issue:
WARNING in __free_frozen_pages

Full report is available here:
https://ci.syzbot.org/series/10f470ac-46ac-4e38-902d-dc86ae743494

***

WARNING in __free_frozen_pages

tree: mm-new
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base: a6fdc327de4678e54b5122441c970371014117b0
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/0586347c-8ef1-427f-8a9c-7f6c08b616a9/config

Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: BNEP socket layer initialized
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Bluetooth: HIDP socket layer initialized
NET: Registered PF_RXRPC protocol family
Key type rxrpc registered
Key type rxrpc_s registered
NET: Registered PF_KCM protocol family
lec:lane_module_init: lec.c: initialized
mpoa:atm_mpoa_init: mpc.c: initialized
l2tp_core: L2TP core driver, V2.0
l2tp_ppp: PPPoL2TP kernel driver, V2.0
l2tp_ip: L2TP IP encapsulation support (L2TPv3)
l2tp_netlink: L2TP netlink interface
l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
NET: Registered PF_PHONET protocol family
8021q: 802.1Q VLAN Support v1.8
sctp: Hash tables configured (bind 32/56)
NET: Registered PF_RDS protocol family
Registered RDS/infiniband transport
Registered RDS/tcp transport
tipc: Activated (version 2.0.0)
NET: Registered PF_TIPC protocol family
tipc: Started in single node mode
smc: adding smcd device lo without pnetid
NET: Registered PF_SMC protocol family
9pnet: Installing 9P2000 support
NET: Registered PF_CAIF protocol family
NET: Registered PF_IEEE802154 protocol family
Key type dns_resolver registered
Key type ceph registered
libceph: loaded (mon/osd proto 15/24)
batman_adv: B.A.T.M.A.N. advanced 2025.5 (compatibility version 15) loaded
openvswitch: Open vSwitch switching datapath
NET: Registered PF_VSOCK protocol family
mpls_gso: MPLS GSO support
IPI shorthand broadcast: enabled
sched_clock: Marking stable (19970046340, 93374727)->(20073238384, -9817317)
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: 98092a222e11368da223b039d625e21c3e2e069c'
zswap: loaded using pool 842
Demotion targets for Node 0: null
Demotion targets for Node 1: null
debug_vm_pgtable: [debug_vm_pgtable ]: Validating architecture page table helpers
------------[ cut here ]------------
page->private
WARNING: mm/page_alloc.c:1433 at __free_frozen_pages+0x78e/0xe10, CPU#0: swapper/0/1
Modules linked in:
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 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:__free_frozen_pages+0x78e/0xe10
Code: 5f 5d e9 05 1e 00 00 48 b8 00 00 00 00 00 fc ff df 0f b6 44 05 00 84 c0 0f 85 d7 02 00 00 c7 03 ff ff ff ff e9 22 fc ff ff 90 <0f> 0b 90 e9 8d fc ff ff bd 01 00 00 00 83 f8 05 0f 85 bb fe ff ff
RSP: 0000:ffffc900000676e0 EFLAGS: 00010282
RAX: 1ffffd4000bad935 RBX: ffffea0005d6c9a8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea0005d6c9b4
RBP: ffffea0005d6c9b8 R08: ffffea0005d6c9b7 R09: 1ffffd4000bad936
R10: dffffc0000000000 R11: fffff94000bad937 R12: ffffea0005d6c980
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88818de64000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000e54c000 CR4: 00000000000006f0
Call Trace:
<TASK>
destroy_args+0x15d/0x570
debug_vm_pgtable+0x3f8/0x410
do_one_initcall+0x250/0x8d0
do_initcall_level+0x104/0x190
do_initcalls+0x59/0xa0
kernel_init_freeable+0x2a6/0x3e0
kernel_init+0x1d/0x1d0
ret_from_fork+0x51e/0xb90
ret_from_fork_asm+0x1a/0x30
</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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