syzbot

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kernel BUG at mm/memory.c:2230!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3549 Comm: syz-executor146 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:vmf_insert_pfn_prot+0x2b3/0x2d0 mm/memory.c:2230
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 07 0b be ff b8 02 00 00 00 eb c4 e8 fb 0a be ff 0f 0b e8 f4 0a be ff 0f 0b e8 ed 0a be ff <0f> 0b e8 c6 9b bd 08 e8 e1 0a be ff 0f 0b 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90003a0f820 EFLAGS: 00010293
RAX: ffffffff81cc7c03 RBX: 0000000000000420 RCX: ffff888028bf0000
RDX: 0000000000000000 RSI: 0000000000000420 RDI: 0000000000000420
RBP: ffffc90003a0f8e0 R08: ffffffff81cc7a4d R09: ffffffff81cc7a21
R10: 0000000000000002 R11: ffff888028bf0000 R12: ffffc90003a0f860
R13: ffff888024efb6c0 R14: 1ffff92000741f08 R15: 000000000c040471
FS:  0000555555c75480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000740 CR3: 0000000027cb2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_gem_shmem_fault+0x1d9/0x230 drivers/gpu/drm/drm_gem_shmem_helper.c:562
 __do_fault+0x136/0x4f0 mm/memory.c:4261
 do_read_fault mm/memory.c:4612 [inline]
 do_fault mm/memory.c:4741 [inline]
 handle_pte_fault mm/memory.c:5013 [inline]
 __handle_mm_fault mm/memory.c:5155 [inline]
 handle_mm_fault+0x3412/0x5340 mm/memory.c:5276
 do_user_addr_fault arch/x86/mm/fault.c:1371 [inline]
 handle_page_fault arch/x86/mm/fault.c:1462 [inline]
 exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90003a0fd50 EFLAGS: 00050202
RAX: ffffffff8437f401 RBX: 00007fffffffefb8 RCX: 0000000000000048
RDX: 0000000000000048 RSI: 0000000020000740 RDI: ffffc90003a0fdc0
RBP: ffffc90003a0fef8 R08: dffffc0000000000 R09: fffff52000741fc1
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000048
R13: 1ffff92000741fb4 R14: ffffc90003a0fdc0 R15: 0000000020000740
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0xf3/0x170 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:161 [inline]
 copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
 copy_from_bpfptr include/linux/bpfptr.h:59 [inline]
 __sys_bpf+0x226/0x6c0 kernel/bpf/syscall.c:4978
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f86b5d4ac29
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8a4a6348 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000fffff000 RCX: 00007f86b5d4ac29
RDX: 0000000000000048 RSI: 0000000020000740 RDI: 0000000000000000
RBP: 00000000fffff000 R08: 00000000fffff000 R09: 00007f86b5d1abd0
R10: 00007ffc8a4a6350 R11: 0000000000000246 R12: 00007f86b5d1a73e
R13: 00007ffc8a4a65b8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vmf_insert_pfn_prot+0x2b3/0x2d0 mm/memory.c:2230
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 07 0b be ff b8 02 00 00 00 eb c4 e8 fb 0a be ff 0f 0b e8 f4 0a be ff 0f 0b e8 ed 0a be ff <0f> 0b e8 c6 9b bd 08 e8 e1 0a be ff 0f 0b 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90003a0f820 EFLAGS: 00010293
RAX: ffffffff81cc7c03 RBX: 0000000000000420 RCX: ffff888028bf0000
RDX: 0000000000000000 RSI: 0000000000000420 RDI: 0000000000000420
RBP: ffffc90003a0f8e0 R08: ffffffff81cc7a4d R09: ffffffff81cc7a21
R10: 0000000000000002 R11: ffff888028bf0000 R12: ffffc90003a0f860
R13: ffff888024efb6c0 R14: 1ffff92000741f08 R15: 000000000c040471
FS:  0000555555c75480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000740 CR3: 0000000027cb2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff c9                	dec    %ecx
   2:	75 f2                	jne    0xfffffff6
   4:	89 d1                	mov    %edx,%ecx
   6:	c1 e9 03             	shr    $0x3,%ecx
   9:	83 e2 07             	and    $0x7,%edx
   c:	f3 48 a5             	rep movsq %ds:(%rsi),%es:(%rdi)
   f:	89 d1                	mov    %edx,%ecx
  11:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
  13:	31 c0                	xor    %eax,%eax
  15:	0f 01 ca             	clac
  18:	c3                   	ret
  19:	8d 0c ca             	lea    (%rdx,%rcx,8),%ecx
  1c:	89 ca                	mov    %ecx,%edx
  1e:	eb 20                	jmp    0x40
  20:	0f 01 cb             	stac
  23:	83 fa 40             	cmp    $0x40,%edx
  26:	72 38                	jb     0x60
  28:	89 d1                	mov    %edx,%ecx
* 2a:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
  2c:	31 c0                	xor    %eax,%eax
  2e:	0f 01 ca             	clac
  31:	c3                   	ret
  32:	89 ca                	mov    %ecx,%edx
  34:	eb 0a                	jmp    0x40
  36:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  3d:	00 00 00