syzbot

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kernel BUG at ./include/linux/pagemap.h:1408!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 6721 Comm: syz.1.189 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline]
RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline]
RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367
Code: 5e 41 5f e9 55 72 16 09 e8 00 35 70 ff 48 89 ef e8 68 1c ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 e4 34 70 ff 90 <0f> 0b e8 dc 34 70 ff 48 c7 c6 00 b7 a0 8b 48 89 ef e8 8d 4d ba ff
RSP: 0018:ffffc9001b8170c0 EFLAGS: 00010246
RAX: 0000000000080000 RBX: ffffc9001b817538 RCX: ffffc9000d53c000
RDX: 0000000000080000 RSI: ffffffff824cd56c RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffff52003702eab R14: 0000000000000001 R15: 1ffff92003702eab
FS:  00007f584c08f6c0(0000) GS:ffff888124b0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000030f030 CR3: 000000002500f000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 read_pages+0x1c4/0xc70 mm/readahead.c:163
 page_cache_ra_unbounded+0x66a/0xa10 mm/readahead.c:269
 do_page_cache_ra mm/readahead.c:332 [inline]
 page_cache_sync_ra+0xab3/0xbf0 mm/readahead.c:611
 do_sync_mmap_readahead mm/filemap.c:3288 [inline]
 filemap_fault+0x1fe3/0x29a0 mm/filemap.c:3489
 __do_fault+0x10d/0x490 mm/memory.c:5280
 do_read_fault mm/memory.c:5698 [inline]
 do_fault mm/memory.c:5832 [inline]
 do_pte_missing+0xf4a/0x3ba0 mm/memory.c:4361
 handle_pte_fault mm/memory.c:6177 [inline]
 __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6318
 handle_mm_fault+0x589/0xd10 mm/memory.c:6487
 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 4d 3c 04 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc9001b817a48 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 00002000002fe000 RCX: 0000000000000038
RDX: fffff52003702f5a RSI: 00002000002fe000 RDI: ffffc9001b817a98
RBP: 0000000000000038 R08: 0000000000000001 R09: fffff52003702f59
R10: ffffc9001b817acf R11: 0000000000000001 R12: 0000000000000000
R13: ffffc9001b817a98 R14: ffffc9001b817b80 R15: ffffc9001b817a98
 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
 _inline_copy_from_user include/linux/uaccess.h:178 [inline]
 _copy_from_user+0x98/0xd0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 copy_msghdr_from_user+0x98/0x160 net/socket.c:2560
 recvmsg_copy_msghdr net/socket.c:2816 [inline]
 ___sys_recvmsg+0xdb/0x1a0 net/socket.c:2888
 do_recvmmsg+0x2fe/0x750 net/socket.c:2987
 __sys_recvmmsg net/socket.c:3061 [inline]
 __do_sys_recvmmsg net/socket.c:3084 [inline]
 __se_sys_recvmmsg net/socket.c:3077 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f584b18efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f584c08f038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f584b3e6090 RCX: 00007f584b18efc9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f584b211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f584b3e6128 R14: 00007f584b3e6090 R15: 00007ffe0c28d138
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline]
RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline]
RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367
Code: 5e 41 5f e9 55 72 16 09 e8 00 35 70 ff 48 89 ef e8 68 1c ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 e4 34 70 ff 90 <0f> 0b e8 dc 34 70 ff 48 c7 c6 00 b7 a0 8b 48 89 ef e8 8d 4d ba ff
RSP: 0018:ffffc9001b8170c0 EFLAGS: 00010246
RAX: 0000000000080000 RBX: ffffc9001b817538 RCX: ffffc9000d53c000
RDX: 0000000000080000 RSI: ffffffff824cd56c RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffff52003702eab R14: 0000000000000001 R15: 1ffff92003702eab
FS:  00007f584c08f6c0(0000) GS:ffff888124b0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcee0db3ad8 CR3: 000000002500f000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	83 f9 08             	cmp    $0x8,%ecx
   3:	73 25                	jae    0x2a
   5:	85 c9                	test   %ecx,%ecx
   7:	74 0f                	je     0x18
   9:	8a 06                	mov    (%rsi),%al
   b:	88 07                	mov    %al,(%rdi)
   d:	48 ff c7             	inc    %rdi
  10:	48 ff c6             	inc    %rsi
  13:	48 ff c9             	dec    %rcx
  16:	75 f1                	jne    0x9
  18:	e9 4d 3c 04 00       	jmp    0x43c6a
  1d:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  24:	00 00 00 00
  28:	66 90                	xchg   %ax,%ax
* 2a:	48 8b 06             	mov    (%rsi),%rax <-- trapping instruction
  2d:	48 89 07             	mov    %rax,(%rdi)
  30:	48 83 c6 08          	add    $0x8,%rsi
  34:	48 83 c7 08          	add    $0x8,%rdi
  38:	83 e9 08             	sub    $0x8,%ecx
  3b:	74 db                	je     0x18
  3d:	83 f9 08             	cmp    $0x8,%ecx