Oops: general protection fault, probably for non-canonical address 0xdffffc001fffc000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000fffe0000-0x00000000fffe0007]
CPU: 1 UID: 0 PID: 13645 Comm: kworker/1:40 Not tainted 6.17.0-rc1-syzkaller-00127-g715c7a36d59f #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: mld mld_ifc_work
RIP: 0010:add_grec+0x79f/0x1740 net/ipv6/mcast.c:1960
Code: c6 e8 05 51 87 f7 45 85 ff 0f 84 b1 00 00 00 e8 b7 4c 87 f7 eb 05 e8 b0 4c 87 f7 4c 89 e0 48 c1 e8 03 48 89 84 24 a0 00 00 00 <42> 80 3c 30 00 74 08 4c 89 e7 e8 e2 b5 ea f7 4d 8b 3c 24 48 8b 7c
RSP: 0018:ffffc9000b50f8f8 EFLAGS: 00010206
RAX: 000000001fffc000 RBX: 0000000000000000 RCX: ffff88802f909e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802f909e00 R09: 0000000000000002
R10: 0000000000000004 R11: 0000000000000000 R12: 00000000fffe0000
R13: 0000000000000005 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a19128000 CR3: 000000004776c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mld_send_cr net/ipv6/mcast.c:2145 [inline]
 mld_ifc_work+0x676/0xd60 net/ipv6/mcast.c:2698
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:add_grec+0x79f/0x1740 net/ipv6/mcast.c:1960
Code: c6 e8 05 51 87 f7 45 85 ff 0f 84 b1 00 00 00 e8 b7 4c 87 f7 eb 05 e8 b0 4c 87 f7 4c 89 e0 48 c1 e8 03 48 89 84 24 a0 00 00 00 <42> 80 3c 30 00 74 08 4c 89 e7 e8 e2 b5 ea f7 4d 8b 3c 24 48 8b 7c
RSP: 0018:ffffc9000b50f8f8 EFLAGS: 00010206
RAX: 000000001fffc000 RBX: 0000000000000000 RCX: ffff88802f909e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802f909e00 R09: 0000000000000002
R10: 0000000000000004 R11: 0000000000000000 R12: 00000000fffe0000
R13: 0000000000000005 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555633d85c8 CR3: 000000004054e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 05 51 87 f7       	call   0xf787510a
   5:	45 85 ff             	test   %r15d,%r15d
   8:	0f 84 b1 00 00 00    	je     0xbf
   e:	e8 b7 4c 87 f7       	call   0xf7874cca
  13:	eb 05                	jmp    0x1a
  15:	e8 b0 4c 87 f7       	call   0xf7874cca
  1a:	4c 89 e0             	mov    %r12,%rax
  1d:	48 c1 e8 03          	shr    $0x3,%rax
  21:	48 89 84 24 a0 00 00 	mov    %rax,0xa0(%rsp)
  28:	00
* 29:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 e7             	mov    %r12,%rdi
  33:	e8 e2 b5 ea f7       	call   0xf7eab61a
  38:	4d 8b 3c 24          	mov    (%r12),%r15
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	7c                   	.byte 0x7c