ip6_append_data+0x1c4/0x380 net/ipv6/ip6_output.c:1860
 rawv6_sendmsg+0x127a/0x1820 net/ipv6/raw.c:911
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x19c/0x270 net/socket.c:729
 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
------------[ cut here ]------------
kernel BUG at mm/filemap.c:3442!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 10998 Comm: syz.4.1169 Not tainted 6.16.0-syzkaller-g260f6f4fda93 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442
Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 dd 67 29 00 e9 81 fc ff ff e8 33 85 c8 ff 48 89 df 48 c7 c6 c0 2f 94 8b e8 c4 af 0d 00 90 <0f> 0b e8 1c 85 c8 ff 48 8b 3c 24 48 c7 c6 40 36 94 8b e8 ac af 0d
RSP: 0018:ffffc900100b76e0 EFLAGS: 00010246
RAX: 879be1fa86fa8700 RBX: ffffea00017bf380 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8d968369 RDI: 00000000ffffffff
RBP: ffffc900100b7818 R08: ffffffff8f9f4a37 R09: 1ffffffff1f3e946
R10: dffffc0000000000 R11: fffffbfff1f3e947 R12: dffffc0000000000
R13: 1ffffd40002f7e71 R14: ffffea00017bf398 R15: ffffea00017bf388
FS:  00007fe0001fe6c0(0000) GS:ffff888125dad000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 000000005cf66000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __do_fault+0x135/0x390 mm/memory.c:5187
 do_shared_fault mm/memory.c:5672 [inline]
 do_fault mm/memory.c:5746 [inline]
 do_pte_missing mm/memory.c:4269 [inline]
 handle_pte_fault mm/memory.c:6087 [inline]
 __handle_mm_fault+0x198b/0x5620 mm/memory.c:6230
 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6399
 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0xd/0x20 arch/x86/lib/putuser.S:94
Code: 66 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc900100b7c98 EFLAGS: 00050206
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000000018b8
RDX: 0000000000000000 RSI: ffffffff8db54274 RDI: ffffffff8be22a00
RBP: ffffc900100b7eb0 R08: 0000000000000000 R09: ffffffff820909c0
R10: dffffc0000000000 R11: ffffed100bbb3571 R12: 0000200000001880
R13: 0000000000040000 R14: 0000200000000480 R15: 0000000000000050
 __sys_sendmmsg+0x25f/0x430 net/socket.c:2762
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe000f8e929
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:00007fe0001fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fe0011b5fa0 RCX: 00007fe000f8e929
RDX: 00000000000002e9 RSI: 0000200000000480 RDI: 0000000000000004
RBP: 00007fe001010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe0011b5fa0 R15: 00007ffdb0f0e6d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442
Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 dd 67 29 00 e9 81 fc ff ff e8 33 85 c8 ff 48 89 df 48 c7 c6 c0 2f 94 8b e8 c4 af 0d 00 90 <0f> 0b e8 1c 85 c8 ff 48 8b 3c 24 48 c7 c6 40 36 94 8b e8 ac af 0d
RSP: 0018:ffffc900100b76e0 EFLAGS: 00010246
RAX: 879be1fa86fa8700 RBX: ffffea00017bf380 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8d968369 RDI: 00000000ffffffff
RBP: ffffc900100b7818 R08: ffffffff8f9f4a37 R09: 1ffffffff1f3e946
R10: dffffc0000000000 R11: fffffbfff1f3e947 R12: dffffc0000000000
R13: 1ffffd40002f7e71 R14: ffffea00017bf398 R15: ffffea00017bf388
FS:  00007fe0001fe6c0(0000) GS:ffff888125dad000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 000000005cf66000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	66 89 01             	mov    %ax,(%rcx)
   3:	31 c9                	xor    %ecx,%ecx
   5:	0f 01 ca             	clac
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	48 89 cb             	mov    %rcx,%rbx
  20:	48 c1 fb 3f          	sar    $0x3f,%rbx
  24:	48 09 d9             	or     %rbx,%rcx
  27:	0f 01 cb             	stac
* 2a:	89 01                	mov    %eax,(%rcx) <-- trapping instruction
  2c:	31 c9                	xor    %ecx,%ecx
  2e:	0f 01 ca             	clac
  31:	c3                   	ret
  32:	cc                   	int3
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop