------------[ cut here ]------------
pgoff != vma->vm_start >> 12
WARNING: mm/vma.h:277 at assert_sane_pgoff mm/vma.h:277 [inline], CPU#1: syz.0.17/5861
WARNING: mm/vma.h:277 at vma_set_pgoff+0x246/0x2d0 mm/vma.h:283, CPU#1: syz.0.17/5861
Modules linked in:
CPU: 1 UID: 0 PID: 5861 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:assert_sane_pgoff mm/vma.h:277 [inline]
RIP: 0010:vma_set_pgoff+0x246/0x2d0 mm/vma.h:283
Code: 0b 90 e9 d5 fe ff ff e8 d8 99 9f ff 4c 89 f7 e8 30 09 00 ff c6 05 8f 7a 3b 0e 01 90 0f 0b 90 e9 fe fe ff ff e8 bb 99 9f ff 90 <0f> 0b 90 eb 9d 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c eb fd ff ff
RSP: 0018:ffffc90002697388 EFLAGS: 00010293
RAX: ffffffff82282165 RBX: 0000000000080004 RCX: ffff888035b3ddc0
RDX: 0000000000000000 RSI: 0000000000080ffe RDI: 0000000000080004
RBP: 0000000000000007 R08: ffff888076c91583 R09: 1ffff1100ed922b0
R10: dffffc0000000000 R11: ffffed100ed922b1 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff888076c91500 R15: 0000000000080ffe
FS:  0000000000000000(0000) GS:ffff888124dd9000(0063) knlGS:0000000056b6e480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7183200 CR3: 000000007bcae000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vma_add_pgoff+0x1a8/0x570 mm/vma.h:314
 __split_vma+0x89e/0xa60 mm/vma.c:607
 vms_gather_munmap_vmas+0x322/0x1370 mm/vma.c:1507
 do_vmi_align_munmap+0x2b4/0x4b0 mm/vma.c:1675
 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1732
 do_munmap+0xf5/0x160 mm/mmap.c:1082
 mremap_to+0x33a/0x8d0 mm/mremap.c:1458
 do_mremap mm/mremap.c:2008 [inline]
 __do_sys_mremap mm/mremap.c:2064 [inline]
 __se_sys_mremap+0xf59/0x12d0 mm/mremap.c:2032
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x27a/0x6a0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f730ec
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 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 58 b8
RSP: 002b:00000000fff0fedc EFLAGS: 00000206 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 0000000080ffd000 RCX: 0000000000001000
RDX: 0000000000002000 RSI: 0000000000000003 RDI: 0000000080ffe000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	85 d2                	test   %edx,%edx
   3:	74 0a                	je     0xf
   5:	89 ce                	mov    %ecx,%esi
   7:	81 e6 ff 0f 00 00    	and    $0xfff,%esi
   d:	89 32                	mov    %esi,(%rdx)
   f:	85 c0                	test   %eax,%eax
  11:	74 05                	je     0x18
  13:	c1 e9 0c             	shr    $0xc,%ecx
  16:	89 08                	mov    %ecx,(%rax)
  18:	31 c0                	xor    %eax,%eax
  1a:	5e                   	pop    %rsi
  1b:	5d                   	pop    %rbp
  1c:	c3                   	ret
  1d:	90                   	nop
  1e:	0f 1f 00             	nopl   (%rax)
  21:	51                   	push   %rcx
  22:	52                   	push   %rdx
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	ret
  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
  3e:	58                   	pop    %rax
  3f:	b8                   	.byte 0xb8