[syzbot] kernel BUG in vmf_insert_pfn_prot

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    9004fd387338 Add linux-next specific files for 20210917
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17ecf0ad300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45d5ac72f31f29f3
dashboard link: https://syzkaller.appspot.com/bug?extid=2d4f8693f438d2bd4bdb
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2d4f8693f438d2bd4bdb@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
kernel BUG at mm/memory.c:2103!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8279 Comm: syz-executor.0 Not tainted 5.15.0-rc1-next-20210917-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vmf_insert_pfn_prot+0x248/0x450 mm/memory.c:2103
Code: 0f 0b e8 6b d0 ca ff 4d 89 f7 bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 b7 d5 ca ff 49 83 ff 20 0f 85 a5 fe ff ff e8 48 d0 ca ff <0f> 0b 49 be ff ff ff ff ff ff 0f 00 e8 37 d0 ca ff 4d 21 ee 4c 89
RSP: 0000:ffffc90005f47bd0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92000be8f7c RCX: 0000000000000000
RDX: ffff888050adb900 RSI: ffffffff81ab3e18 RDI: 0000000000000003
RBP: ffff88807e3bcc60 R08: 0000000000000020 R09: ffffc90005f47bb7
R10: ffffffff81ab3e09 R11: 1ffffffff1ebb3fc R12: 000000002001d000
R13: 0000000000145dc3 R14: 0000000008140476 R15: 0000000000000020
FS:  0000555555f1e400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005608abbf4250 CR3: 000000006e072000 CR4: 00000000001506f0
Call Trace:
 drm_gem_shmem_fault+0x1e3/0x290 drivers/gpu/drm/drm_gem_shmem_helper.c:564
 __do_fault+0x10d/0x4d0 mm/memory.c:3848
 do_cow_fault mm/memory.c:4184 [inline]
 do_fault mm/memory.c:4285 [inline]
 handle_pte_fault mm/memory.c:4541 [inline]
 __handle_mm_fault+0x370e/0x5120 mm/memory.c:4676
 handle_mm_fault+0x1c8/0x790 mm/memory.c:4774
 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0x7f1096c04d5a
Code: 30 48 8b 34 24 48 85 f6 74 17 8b 44 24 18 0f c8 89 c0 48 89 44 24 18 48 83 fe 01 0f 85 a1 01 00 00 48 8b 44 24 10 8b 74 24 18 <89> 30 e9 d2 fc ff ff 48 8b 44 24 10 8b 10 48 8b 04 24 48 85 c0 0f
RSP: 002b:00007ffd0b939970 EFLAGS: 00010246
RAX: 000000002001d000 RBX: 00007f109716c000 RCX: 0000000000000000
RDX: 182c4ff2a4394aee RSI: 0000000000000001 RDI: 0000555555f1e2f0
RBP: 00007ffd0b939a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 00000000e900f6d2 R12: 00000000001760c0
R13: 00000000000003e8 R14: 00007f1096d67f80 R15: 0000000000176064
Modules linked in:
---[ end trace 1a78047d43092735 ]---
RIP: 0010:vmf_insert_pfn_prot+0x248/0x450 mm/memory.c:2103
Code: 0f 0b e8 6b d0 ca ff 4d 89 f7 bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 b7 d5 ca ff 49 83 ff 20 0f 85 a5 fe ff ff e8 48 d0 ca ff <0f> 0b 49 be ff ff ff ff ff ff 0f 00 e8 37 d0 ca ff 4d 21 ee 4c 89
RSP: 0000:ffffc90005f47bd0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92000be8f7c RCX: 0000000000000000
RDX: ffff888050adb900 RSI: ffffffff81ab3e18 RDI: 0000000000000003
RBP: ffff88807e3bcc60 R08: 0000000000000020 R09: ffffc90005f47bb7
R10: ffffffff81ab3e09 R11: 1ffffffff1ebb3fc R12: 000000002001d000
R13: 0000000000145dc3 R14: 0000000008140476 R15: 0000000000000020
FS:  0000555555f1e400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb730a0718 CR3: 000000006e072000 CR4: 00000000001506e0


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