------------[ cut here ]------------
pgoff != vma->vm_start >> 12
WARNING: mm/vma.h:277 at assert_sane_pgoff mm/vma.h:277 [inline], CPU#0: syz.1.186/7144
WARNING: mm/vma.h:277 at vma_set_pgoff mm/vma.h:283 [inline], CPU#0: syz.1.186/7144
WARNING: mm/vma.h:277 at vma_add_pgoff mm/vma.h:314 [inline], CPU#0: syz.1.186/7144
WARNING: mm/vma.h:277 at __split_vma+0x162b/0x1de0 mm/vma.c:607, CPU#0: syz.1.186/7144
Modules linked in:
CPU: 0 UID: 0 PID: 7144 Comm: syz.1.186 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:assert_sane_pgoff mm/vma.h:277 [inline]
RIP: 0010:vma_set_pgoff mm/vma.h:283 [inline]
RIP: 0010:vma_add_pgoff mm/vma.h:314 [inline]
RIP: 0010:__split_vma+0x162b/0x1de0 mm/vma.c:607
Code: 3c 02 00 0f 85 b1 07 00 00 4d 8b 27 48 89 ef 49 c1 ec 0c 4c 89 e6 e8 e4 1c 9e ff 4c 39 e5 0f 84 63 fc ff ff e8 f6 22 9e ff 90 <0f> 0b 90 e9 55 fc ff ff e8 e8 22 9e ff 48 8b 54 24 30 48 b8 00 00
RSP: 0018:ffffc90003ecf690 EFLAGS: 00010287
RAX: 000000000000021e RBX: ffff88804a00ab90 RCX: ffffc90006301000
RDX: 0000000000080000 RSI: ffffffff826dcd1a RDI: ffff88802b31a580
RBP: 0000000200000004 R08: 0000000000000006 R09: 0000000200000004
R10: 0000000200000ffe R11: 0000000000000000 R12: 0000000200000ffe
R13: ffff88804a00abc0 R14: ffffc90003ecfd58 R15: ffff88804a00ab40
FS:  00007f82507ce6c0(0000) GS:ffff8880d5b61000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33923ffc CR3: 000000005acc3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 split_vma mm/vma.c:643 [inline]
 vma_modify+0x1ef4/0x29b0 mm/vma.c:1771
 vma_modify_flags+0x2c3/0x460 mm/vma.c:1799
 mprotect_fixup+0x27a/0xe00 mm/mprotect.c:824
 do_mprotect_pkey+0xa51/0xdd0 mm/mprotect.c:1002
 __do_sys_mprotect mm/mprotect.c:1023 [inline]
 __se_sys_mprotect mm/mprotect.c:1020 [inline]
 __x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:1020
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f824f99e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f82507ce028 EFLAGS: 00000246 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f824fc25fa0 RCX: 00007f824f99e159
RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000200000ffe000
RBP: 00007f824fa35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f824fc26038 R14: 00007f824fc25fa0 R15: 00007ffe2e258d38
 </TASK>