f7feb000-ff908fff: 0000000000000000
    ff909000-ff929fff: ffff8880131deb40
    ff92a000-ffffffffffffffff: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 2 PID: 23028 at mm/vma.c:768 vma_merge_existing_range+0x5d1/0x1cd0 mm/vma.c:768
Modules linked in:
CPU: 2 UID: 0 PID: 23028 Comm: syz.2.4415 Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #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:vma_merge_existing_range+0x5d1/0x1cd0 mm/vma.c:768
Code: 00 00 00 48 89 d8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 5f 02 ab ff 48 c7 c6 e0 c9 9b 8b 48 89 df e8 c0 ba f2 ff 90 <0f> 0b 90 e9 9d fc ff ff e8 42 02 ab ff 48 8b 54 24 20 48 b8 00 00
RSP: 0018:ffffc90002ed7b10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc90002ed7c70 RCX: ffffffff8b5fc713
RDX: ffff888023a80000 RSI: ffffffff820f9a90 RDI: 0000000000000006
RBP: ffff888021c892c0 R08: 0000000000000006 R09: ffffffffffffffff
R10: ffffffffffffffff R11: 0000000000000000 R12: 0000000080800000
R13: ffffc90002ed7c90 R14: ffff888021c892c0 R15: 0000000080000000
FS:  0000000000000000(0000) GS:ffff8880979ec000(0063) knlGS:00000000f510eb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f510dfac CR3: 000000006862a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vma_modify+0x87/0x510 mm/vma.c:1564
 vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
 mlock_fixup+0x27c/0xe50 mm/mlock.c:483
 apply_mlockall_flags+0x2d4/0x470 mm/mlock.c:736
 __do_sys_munlockall+0xc5/0x280 mm/mlock.c:782
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x73/0x120 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: 0023:0xf711e579
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:00000000f510e55c EFLAGS: 00000296 ORIG_RAX: 0000000000000099
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 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