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:00000000f503655c EFLAGS: 00000206 ORIG_RAX: 0000000000000003
RAX: 0000000000000020 RBX: 0000000000000003 RCX: 0000000080000140
RDX: 00000000000000ee RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
BUG: unable to handle page fault for address: fffffffffffffff4
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD e93c067 P4D e93c067 PUD e93e067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 20777 Comm: syz.9.2979 Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vma_merge_existing_range+0x310/0x1770 mm/vma.c:734
Code: ff 4d 85 ff 48 89 5c 24 30 74 47 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 80 fb 0e 00 <4d> 8b 2f 48 8b 5c 24 68 48 89 df 4c 89 ee e8 3d be a7 ff 4c 39 eb
RSP: 0018:ffffc900103cf820 EFLAGS: 00010246
RAX: 1ffffffffffffffe RBX: ffffc900103cfa40 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900103cf970 R08: ffffffff821a2356 R09: 0000000008100077
R10: 0000000000000003 R11: ffff888035773c00 R12: 0000000080ce2000
R13: ffff88804b73c5d0 R14: ffffc900103cfa20 R15: fffffffffffffff4
FS:  0000000000000000(0000) GS:ffff8880b8700000(0063) knlGS:00000000f5036b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 000000005d04a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vma_modify+0x76/0x390 mm/vma.c:1517
 vma_modify_flags_uffd+0x389/0x410 mm/vma.c:1598
 userfaultfd_clear_vma mm/userfaultfd.c:1906 [inline]
 userfaultfd_release_all+0x396/0x620 mm/userfaultfd.c:2024
 userfaultfd_release+0xe8/0x1b0 fs/userfaultfd.c:865
 __fput+0x3e9/0x9f0 fs/file_table.c:464
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 __do_fast_syscall_32+0xc4/0x110 arch/x86/entry/common.c:390
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:412
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f14579
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:00000000f503655c EFLAGS: 00000206 ORIG_RAX: 0000000000000003
RAX: 0000000000000020 RBX: 0000000000000003 RCX: 0000000080000140
RDX: 00000000000000ee RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: fffffffffffffff4
---[ end trace 0000000000000000 ]---
RIP: 0010:vma_merge_existing_range+0x310/0x1770 mm/vma.c:734
Code: ff 4d 85 ff 48 89 5c 24 30 74 47 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 80 fb 0e 00 <4d> 8b 2f 48 8b 5c 24 68 48 89 df 4c 89 ee e8 3d be a7 ff 4c 39 eb
RSP: 0018:ffffc900103cf820 EFLAGS: 00010246
RAX: 1ffffffffffffffe RBX: ffffc900103cfa40 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900103cf970 R08: ffffffff821a2356 R09: 0000000008100077
R10: 0000000000000003 R11: ffff888035773c00 R12: 0000000080ce2000
R13: ffff88804b73c5d0 R14: ffffc900103cfa20 R15: fffffffffffffff4
FS:  0000000000000000(0000) GS:ffff8880b8700000(0063) knlGS:00000000f5036b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 000000005d04a000 CR4: 00000000003526f0
----------------
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