RSP: 002b:00007fb974a6c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fb973da5fa0 RCX: 00007fb973b8d169
RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000
RBP: 00007fb974a6c090 R08: 0000200000ffa000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fb973da5fa0 R15: 00007fffdb04e728
 </TASK>
BUG: kernel NULL pointer dereference, address: 0000000000000022
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 10ef99067 P4D 10ef99067 PUD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 1 UID: 0 PID: 3530 Comm: syz.3.16 Not tainted 6.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vrm_uncharge mm/mremap.c:857 [inline]
RIP: 0010:expand_vma_in_place mm/mremap.c:1341 [inline]
RIP: 0010:expand_vma mm/mremap.c:1396 [inline]
RIP: 0010:mremap_at mm/mremap.c:1457 [inline]
RIP: 0010:do_mremap mm/mremap.c:1502 [inline]
RIP: 0010:__do_sys_mremap+0x7f2/0x840 mm/mremap.c:1559
Code: 1b 4c 8b 2c 24 4d 89 ec e9 6f fb ff ff 4c 01 bd 68 02 00 00 c6 84 24 d0 00 00 00 01 48 8b 04 24 48 89 84 24 a0 00 00 00 eb d7 <f6> 04 25 22 00 00 00 10 74 27 48 8b b4 24 e0 00 00 00 8b 15 1a a4
RSP: 0018:ffffc90001d43e00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888106bf5c80 RCX: 0000000000000027
RDX: 0000000000000000 RSI: ffffffff832682f5 RDI: 0000000000000000
RBP: ffff88810b738000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffc90001d43808 R11: ffffffff837de0a8 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888106bf5df0 R15: ffffc90001d43e80
FS:  00007fb974a6c6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000022 CR3: 0000000109796000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x6d/0x170 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb973b8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb974a6c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fb973da5fa0 RCX: 00007fb973b8d169
RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000
RBP: 00007fb974a6c090 R08: 0000200000ffa000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fb973da5fa0 R15: 00007fffdb04e728
 </TASK>
Modules linked in:
CR2: 0000000000000022
---[ end trace 0000000000000000 ]---
RIP: 0010:vrm_uncharge mm/mremap.c:857 [inline]
RIP: 0010:expand_vma_in_place mm/mremap.c:1341 [inline]
RIP: 0010:expand_vma mm/mremap.c:1396 [inline]
RIP: 0010:mremap_at mm/mremap.c:1457 [inline]
RIP: 0010:do_mremap mm/mremap.c:1502 [inline]
RIP: 0010:__do_sys_mremap+0x7f2/0x840 mm/mremap.c:1559
Code: 1b 4c 8b 2c 24 4d 89 ec e9 6f fb ff ff 4c 01 bd 68 02 00 00 c6 84 24 d0 00 00 00 01 48 8b 04 24 48 89 84 24 a0 00 00 00 eb d7 <f6> 04 25 22 00 00 00 10 74 27 48 8b b4 24 e0 00 00 00 8b 15 1a a4
RSP: 0018:ffffc90001d43e00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888106bf5c80 RCX: 0000000000000027
RDX: 0000000000000000 RSI: ffffffff832682f5 RDI: 0000000000000000
RBP: ffff88810b738000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffc90001d43808 R11: ffffffff837de0a8 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888106bf5df0 R15: ffffc90001d43e80
FS:  00007fb974a6c6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000022 CR3: 0000000109796000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	1b 4c 8b 2c          	sbb    0x2c(%rbx,%rcx,4),%ecx
   4:	24 4d                	and    $0x4d,%al
   6:	89 ec                	mov    %ebp,%esp
   8:	e9 6f fb ff ff       	jmp    0xfffffb7c
   d:	4c 01 bd 68 02 00 00 	add    %r15,0x268(%rbp)
  14:	c6 84 24 d0 00 00 00 	movb   $0x1,0xd0(%rsp)
  1b:	01
  1c:	48 8b 04 24          	mov    (%rsp),%rax
  20:	48 89 84 24 a0 00 00 	mov    %rax,0xa0(%rsp)
  27:	00
  28:	eb d7                	jmp    0x1
* 2a:	f6 04 25 22 00 00 00 	testb  $0x10,0x22 <-- trapping instruction
  31:	10
  32:	74 27                	je     0x5b
  34:	48 8b b4 24 e0 00 00 	mov    0xe0(%rsp),%rsi
  3b:	00
  3c:	8b                   	.byte 0x8b
  3d:	15                   	.byte 0x15
  3e:	1a                   	.byte 0x1a
  3f:	a4                   	movsb  %ds:(%rsi),%es:(%rdi)