syzbot

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kernel BUG at mm/memory.c:2237!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 5074 Comm: syz-executor168 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:vmf_insert_pfn_prot+0x24e/0x710 mm/memory.c:2237
Code: 0b e8 46 62 ba ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 42 5d ba ff 49 83 ff 20 0f 85 a4 fe ff ff e8 23 62 ba ff 90 <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 11 62 ba ff 4c 89 f6 48 89
RSP: 0018:ffffc900041d7708 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802d725d00 RCX: ffffffff81d3d9fe
RDX: ffff88801fc08000 RSI: ffffffff81d3da0d RDI: 0000000000000007
RBP: 000000000c040474 R08: 0000000000000007 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000009 R12: 0000000020ffd000
R13: 1ffff9200083aee2 R14: 00000000000798b7 R15: 0000000000000020
FS:  00005555820d2480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ffd000 CR3: 0000000076184000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 drm_gem_shmem_fault+0x207/0x410 drivers/gpu/drm/drm_gem_shmem_helper.c:531
 __do_fault+0x10d/0x4a0 mm/memory.c:4396
 do_read_fault mm/memory.c:4758 [inline]
 do_fault mm/memory.c:4888 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5164 [inline]
 __handle_mm_fault+0x32c2/0x4920 mm/memory.c:5305
 handle_mm_fault+0x476/0xa00 mm/memory.c:5470
 do_user_addr_fault+0x2e5/0x1080 arch/x86/mm/fault.c:1413
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x5b/0x70 arch/x86/lib/copy_user_64.S:80
Code: 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 eb 05 e9 0f 3d 10 00 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 af e9 f7 3c 10 00 48 8d 0c c8 eb a4 90 90
RSP: 0018:ffffc900041d7b10 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000020ffd000 RCX: 0000000000000200
RDX: 0000000000000000 RSI: 0000000020ffd000 RDI: ffff888021bbc000
RBP: 0000000000001000 R08: 0000000000000001 R09: ffffed10043779ff
R10: ffff888021bbcfff R11: 0000000000000000 R12: 0000000020ffe000
R13: ffff888021bbc000 R14: 0000000000000000 R15: 0000000020ffd000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:125 [inline]
 _copy_from_user+0xc6/0xf0 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:183 [inline]
 snd_rawmidi_kernel_write1+0x4f9/0x880 sound/core/rawmidi.c:1555
 snd_rawmidi_write+0x26d/0xc00 sound/core/rawmidi.c:1624
 vfs_write+0x29b/0x1100 fs/read_write.c:588
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f9b07dfe4b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc12a03518 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9b07dfe4b9
RDX: 00000000fffffd2c RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 00007ffc12a03560 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vmf_insert_pfn_prot+0x24e/0x710 mm/memory.c:2237
Code: 0b e8 46 62 ba ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 42 5d ba ff 49 83 ff 20 0f 85 a4 fe ff ff e8 23 62 ba ff 90 <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 11 62 ba ff 4c 89 f6 48 89
RSP: 0018:ffffc900041d7708 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802d725d00 RCX: ffffffff81d3d9fe
RDX: ffff88801fc08000 RSI: ffffffff81d3da0d RDI: 0000000000000007
RBP: 000000000c040474 R08: 0000000000000007 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000009 R12: 0000000020ffd000
R13: 1ffff9200083aee2 R14: 00000000000798b7 R15: 0000000000000020
FS:  00005555820d2480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ffd000 CR3: 0000000076184000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	8b 06                	mov    (%rsi),%eax
   2:	48 89 07             	mov    %rax,(%rdi)
   5:	48 83 c6 08          	add    $0x8,%rsi
   9:	48 83 c7 08          	add    $0x8,%rdi
   d:	83 e9 08             	sub    $0x8,%ecx
  10:	74 df                	je     0xfffffff1
  12:	83 f9 08             	cmp    $0x8,%ecx
  15:	73 e8                	jae    0xffffffff
  17:	eb c9                	jmp    0xffffffe2
  19:	eb 05                	jmp    0x20
  1b:	e9 0f 3d 10 00       	jmp    0x103d2f
  20:	48 89 c8             	mov    %rcx,%rax
  23:	48 c1 e9 03          	shr    $0x3,%rcx
  27:	83 e0 07             	and    $0x7,%eax
* 2a:	f3 48 a5             	rep movsq %ds:(%rsi),%es:(%rdi) <-- trapping instruction
  2d:	89 c1                	mov    %eax,%ecx
  2f:	85 c9                	test   %ecx,%ecx
  31:	75 af                	jne    0xffffffe2
  33:	e9 f7 3c 10 00       	jmp    0x103d2f
  38:	48 8d 0c c8          	lea    (%rax,%rcx,8),%rcx
  3c:	eb a4                	jmp    0xffffffe2
  3e:	90                   	nop
  3f:	90                   	nop