[syzbot] [mm?] WARNING in vma_merge_existing_range

[syzbot <syzbot+46423ed8fa1f1148c6e4@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    8379578b11d5 Merge tag 'for-v6.13-rc' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16113018580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d269ef41b9262400
dashboard link: https://syzkaller.appspot.com/bug?extid=46423ed8fa1f1148c6e4
compiler:       Debian clang version 15.0.6, 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: https://storage.googleapis.com/syzbot-assets/86d2e3352aff/disk-8379578b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/345570cd3573/vmlinux-8379578b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/01da37a51505/bzImage-8379578b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+46423ed8fa1f1148c6e4@syzkaller.appspotmail.com

RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 1 PID: 20504 at mm/vma.c:734 vma_merge_existing_range+0x1145/0x16f0 mm/vma.c:734
Modules linked in:
CPU: 1 UID: 0 PID: 20504 Comm: syz.6.5485 Not tainted 6.13.0-rc4-syzkaller-00069-g8379578b11d5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:vma_merge_existing_range+0x1145/0x16f0 mm/vma.c:734
Code: e8 20 24 0f 00 4d 2b 7d 00 4d 89 ec 48 8b 7c 24 38 e9 7f 01 00 00 e8 3a bc a8 ff 90 0f 0b 90 e9 a8 f1 ff ff e8 2c bc a8 ff 90 <0f> 0b 90 e9 0e f2 ff ff e8 1e bc a8 ff 90 0f 0b 90 4d 85 ed 0f 85
RSP: 0018:ffffc9000ba274a0 EFLAGS: 00010293
RAX: ffffffff81f6b804 RBX: 0000000020c25000 RCX: ffff888060ad1e00
RDX: 0000000000000000 RSI: 0000000020c25000 RDI: 0000000020c25000
RBP: ffffc9000ba275f8 R08: ffffffff81f6aa0d R09: 00000000280000fa
R10: ffffc9000ba27810 R11: fffff52001744f07 R12: 0000000020c25000
R13: ffff888069b666c8 R14: ffffc9000ba276a0 R15: ffff888068d0b1f0
FS:  0000000000000000(0000) GS:ffff8880b8700000(0063) knlGS:00000000f5116b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fa9de2c0018 CR3: 000000006b562000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vma_modify+0x41/0x330 mm/vma.c:1514
 vma_modify_flags_name+0x3a6/0x430 mm/vma.c:1563
 madvise_update_vma+0x2fe/0xc10 mm/madvise.c:159
 madvise_vma_behavior mm/madvise.c:1325 [inline]
 madvise_walk_vmas mm/madvise.c:1497 [inline]
 do_madvise+0x1e64/0x4d10 mm/madvise.c:1684
 __do_sys_madvise mm/madvise.c:1700 [inline]
 __se_sys_madvise mm/madvise.c:1698 [inline]
 __ia32_sys_madvise+0xa6/0xc0 mm/madvise.c:1698
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc2579
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 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f511655c EFLAGS: 00000206 ORIG_RAX: 00000000000000db
RAX: ffffffffffffffda RBX: 0000000020c00000 RCX: 0000000000400000
RDX: 000000000000000e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 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:	90                   	nop
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop


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