syzbot

------------[ cut here ]------------
kernel BUG at mm/memory.c:2218!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3608 Comm: syz-executor941 Not tainted 6.0.0-syzkaller-05118-g833477fce7a1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:vmf_insert_pfn_prot+0x248/0x460 mm/memory.c:2218
Code: 0f 0b e8 8b 9d c6 ff 4d 89 f7 bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 57 9a c6 ff 49 83 ff 20 0f 85 a5 fe ff ff e8 68 9d c6 ff <0f> 0b 49 be ff ff ff ff ff ff 0f 00 e8 57 9d c6 ff 4d 21 ee 4c 89
RSP: 0018:ffffc900030ef8e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200061df1f RCX: 0000000000000000
RDX: ffff88807e59c140 RSI: ffffffff81b3a3f8 RDI: 0000000000000007
RBP: ffff88802125a528 R08: 0000000000000007 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: 0000000020000000
R13: 000000000001e9f3 R14: 000000000c040474 R15: 0000000000000020
FS:  0000555556f243c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000240 CR3: 000000001e965000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_gem_shmem_fault+0x1e3/0x290 drivers/gpu/drm/drm_gem_shmem_helper.c:562
 __do_fault+0x10d/0x610 mm/memory.c:4173
 do_read_fault mm/memory.c:4524 [inline]
 do_fault mm/memory.c:4653 [inline]
 handle_pte_fault mm/memory.c:4917 [inline]
 __handle_mm_fault+0x2130/0x39b0 mm/memory.c:5059
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5157
 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1407
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0x1bd/0x3c0 lib/strncpy_from_user.c:139
Code: ed 08 4d 89 74 1d 00 bf 07 00 00 00 48 83 c3 08 48 89 ee e8 c5 79 5a fd 48 83 fd 07 0f 86 c0 01 00 00 e8 d6 7c 5a fd 45 31 ff <49> 8b 04 1c 31 ff 44 89 fe 49 89 c6 e8 82 79 5a fd 45 85 ff 0f 84
RSP: 0018:ffffc900030efd08 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88807e59c140 RSI: ffffffff841fc48a RDI: 0000000000000007
RBP: 0000000000000fe0 R08: 0000000000000007 R09: 0000000000000007
R10: 0000000000000fe0 R11: 0000000000000000 R12: 0000000020000240
R13: ffff88807e37a9a0 R14: ffff88807e37a9a0 R15: 0000000000000000
 getname_flags.part.0+0x95/0x4f0 fs/namei.c:150
 getname_flags include/linux/audit.h:320 [inline]
 getname+0x8e/0xd0 fs/namei.c:218
 do_sys_openat2+0xf5/0x4c0 fs/open.c:1307
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_openat fs/open.c:1345 [inline]
 __se_sys_openat fs/open.c:1340 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6f30426159
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffde672f708 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffde672f718 RCX: 00007f6f30426159
RDX: 000000000000275a RSI: 0000000020000240 RDI: 00000000ffffff9c
RBP: 00007ffde672f710 R08: 00007ffde672f710 R09: 00007f6f303e9020
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vmf_insert_pfn_prot+0x248/0x460 mm/memory.c:2218
Code: 0f 0b e8 8b 9d c6 ff 4d 89 f7 bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 57 9a c6 ff 49 83 ff 20 0f 85 a5 fe ff ff e8 68 9d c6 ff <0f> 0b 49 be ff ff ff ff ff ff 0f 00 e8 57 9d c6 ff 4d 21 ee 4c 89
RSP: 0018:ffffc900030ef8e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200061df1f RCX: 0000000000000000
RDX: ffff88807e59c140 RSI: ffffffff81b3a3f8 RDI: 0000000000000007
RBP: ffff88802125a528 R08: 0000000000000007 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: 0000000020000000
R13: 000000000001e9f3 R14: 000000000c040474 R15: 0000000000000020
FS:  0000555556f243c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000240 CR3: 000000001e965000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ed                   	in     (%dx),%eax
   1:	08 4d 89             	or     %cl,-0x77(%rbp)
   4:	74 1d                	je     0x23
   6:	00 bf 07 00 00 00    	add    %bh,0x7(%rdi)
   c:	48 83 c3 08          	add    $0x8,%rbx
  10:	48 89 ee             	mov    %rbp,%rsi
  13:	e8 c5 79 5a fd       	callq  0xfd5a79dd
  18:	48 83 fd 07          	cmp    $0x7,%rbp
  1c:	0f 86 c0 01 00 00    	jbe    0x1e2
  22:	e8 d6 7c 5a fd       	callq  0xfd5a7cfd
  27:	45 31 ff             	xor    %r15d,%r15d
* 2a:	49 8b 04 1c          	mov    (%r12,%rbx,1),%rax <-- trapping instruction
  2e:	31 ff                	xor    %edi,%edi
  30:	44 89 fe             	mov    %r15d,%esi
  33:	49 89 c6             	mov    %rax,%r14
  36:	e8 82 79 5a fd       	callq  0xfd5a79bd
  3b:	45 85 ff             	test   %r15d,%r15d
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84