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Message-ID: <68b3a799.a00a0220.1337b0.0029.GAE@google.com>
Date: Sat, 30 Aug 2025 18:38:33 -0700
From: syzbot <syzbot+2f3c8569e4b7486452ae@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, apopple@...dia.com, byungchul@...com, 
	david@...hat.com, gourry@...rry.net, joshua.hahnjy@...il.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, matthew.brost@...el.com, 
	rakie.kim@...com, syzkaller-bugs@...glegroups.com, 
	ying.huang@...ux.alibaba.com, ziy@...dia.com
Subject: [syzbot] [mm?] WARNING in new_slab (2)

Hello,

syzbot found the following issue on:

HEAD commit:    fab1beda7597 Merge tag 'devicetree-fixes-for-6.17-1' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ad77bc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fecbb496f75d3d61
dashboard link: https://syzkaller.appspot.com/bug?extid=2f3c8569e4b7486452ae
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-fab1beda.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/813fdba24db0/vmlinux-fab1beda.xz
kernel image: https://storage.googleapis.com/syzbot-assets/12a740d2c9a6/bzImage-fab1beda.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2f3c8569e4b7486452ae@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 10417 at mm/page_alloc.c:4619 __alloc_pages_slowpath mm/page_alloc.c:4619 [inline]
WARNING: CPU: 1 PID: 10417 at mm/page_alloc.c:4619 __alloc_frozen_pages_noprof+0x1f21/0x23f0 mm/page_alloc.c:5161
Modules linked in:
CPU: 1 UID: 0 PID: 10417 Comm: syz.1.1147 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__alloc_pages_slowpath mm/page_alloc.c:4619 [inline]
RIP: 0010:__alloc_frozen_pages_noprof+0x1f21/0x23f0 mm/page_alloc.c:5161
Code: 90 0f 0b 90 e9 0d f9 ff ff e8 bb d6 0c 00 e9 43 f1 ff ff 4c 89 ff e8 ae d6 0c 00 e9 1e f1 ff ff 90 0f 0b 90 e9 3b fb ff ff 90 <0f> 0b 90 e9 24 fb ff ff 89 b4 24 90 00 00 00 48 89 54 24 50 e8 56
RSP: 0018:ffffc90003a477f8 EFLAGS: 00010202
RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffffc90003a4792c
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88803fffd9b8
RBP: 0000000000048cc0 R08: 0000000000004f8b R09: 00000000000043f1
R10: 0000000000000000 R11: ffffc90003a47920 R12: ffff88803fffbb80
R13: 1ffff92000748f14 R14: 0000000000000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880975c3000(0063) knlGS:00000000f5484b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000326f2ffc CR3: 0000000070630000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab mm/slub.c:2663 [inline]
 new_slab+0x265/0x330 mm/slub.c:2709
 ___slab_alloc+0xcf2/0x1740 mm/slub.c:3891
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4391
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 xfs_init_fs_context+0x45/0x5e0 fs/xfs/xfs_super.c:2278
 alloc_fs_context+0x54d/0x9c0 fs/fs_context.c:318
 do_new_mount fs/namespace.c:3787 [inline]
 path_mount+0xbdd/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __ia32_sys_mount+0x28b/0x310 fs/namespace.c:4324
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fa4579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f548455c EFLAGS: 00000296 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 0000000080000140 RCX: 0000000080000040
RDX: 0000000080000080 RSI: 0000000002208004 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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