Oops: general protection fault, probably for non-canonical address 0xdffffc001fff6000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000fffb0000-0x00000000fffb0007]
CPU: 1 UID: 0 PID: 5944 Comm: kworker/1:5 Not tainted 6.16.0-syzkaller #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+0x764/0x1670 net/ipv6/mcast.c:1967
Code: 41 01 41 89 c7 31 ff 89 c6 e8 b8 ba 9a f7 45 85 ff 0f 84 b0 00 00 00 e8 6a b6 9a f7 eb 05 e8 63 b6 9a f7 49 89 ee 49 c1 ee 03 <43> 80 3c 26 00 74 08 48 89 ef e8 8d 9d fa f7 48 8b 45 00 48 89 84
RSP: 0018:ffffc9000ae3f8f8 EFLAGS: 00010206
RAX: ffffffff8a256f56 RBX: ffff88806822cb40 RCX: ffff888030fc1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00000000fffb0000 R08: ffff888030fc1e00 R09: 0000000000000002
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000005 R14: 000000001fff6000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f305af82698 CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mld_send_cr net/ipv6/mcast.c:2155 [inline]
 mld_ifc_work+0x671/0xde0 net/ipv6/mcast.c:2702
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/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+0x764/0x1670 net/ipv6/mcast.c:1967
Code: 41 01 41 89 c7 31 ff 89 c6 e8 b8 ba 9a f7 45 85 ff 0f 84 b0 00 00 00 e8 6a b6 9a f7 eb 05 e8 63 b6 9a f7 49 89 ee 49 c1 ee 03 <43> 80 3c 26 00 74 08 48 89 ef e8 8d 9d fa f7 48 8b 45 00 48 89 84
RSP: 0018:ffffc9000ae3f8f8 EFLAGS: 00010206
RAX: ffffffff8a256f56 RBX: ffff88806822cb40 RCX: ffff888030fc1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00000000fffb0000 R08: ffff888030fc1e00 R09: 0000000000000002
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000005 R14: 000000001fff6000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2504d9 CR3: 000000000df38000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	41 89 c7             	mov    %eax,%r15d
   3:	31 ff                	xor    %edi,%edi
   5:	89 c6                	mov    %eax,%esi
   7:	e8 b8 ba 9a f7       	call   0xf79abac4
   c:	45 85 ff             	test   %r15d,%r15d
   f:	0f 84 b0 00 00 00    	je     0xc5
  15:	e8 6a b6 9a f7       	call   0xf79ab684
  1a:	eb 05                	jmp    0x21
  1c:	e8 63 b6 9a f7       	call   0xf79ab684
  21:	49 89 ee             	mov    %rbp,%r14
  24:	49 c1 ee 03          	shr    $0x3,%r14
* 28:	43 80 3c 26 00       	cmpb   $0x0,(%r14,%r12,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	48 89 ef             	mov    %rbp,%rdi
  32:	e8 8d 9d fa f7       	call   0xf7fa9dc4
  37:	48 8b 45 00          	mov    0x0(%rbp),%rax
  3b:	48                   	rex.W
  3c:	89                   	.byte 0x89
  3d:	84                   	.byte 0x84