syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 1 UID: 0 PID: 26245 Comm: kworker/u8:0 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593
Code: ff ff ff e8 a3 b7 41 01 89 c5 31 ff 89 c6 e8 f8 95 91 f7 85 ed 74 45 e8 af 91 91 f7 eb 05 e8 a8 91 91 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 72 b3 f4 f7 49 8b 2c 24 49 8d 7c
RSP: 0018:ffffc900000e7098 EFLAGS: 00010216
RAX: 000000001fffe000 RBX: 1ffff1100fc27982 RCX: ffff88802eeb1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8fa08df7 R09: 1ffffffff1f411be
R10: dffffc0000000000 R11: fffffbfff1f411bf R12: 00000000ffff0000
R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88807e13cc10
FS:  0000000000000000(0000) GS:ffff888125d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000003c000 CR3: 0000000024b83000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __ipv6_dev_mc_dec+0x2e4/0x330 net/ipv6/mcast.c:1009
 addrconf_leave_solict net/ipv6/addrconf.c:2257 [inline]
 __ipv6_ifa_notify+0x43d/0xac0 net/ipv6/addrconf.c:6299
 addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3977
 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 netif_close_many+0x29c/0x410 net/core/dev.c:1784
 unregister_netdevice_many_notify+0x7b9/0x1ff0 net/core/dev.c:12126
 unregister_netdevice_many net/core/dev.c:12219 [inline]
 default_device_exit_batch+0x819/0x890 net/core/dev.c:12723
 ops_exit_list net/core/net_namespace.c:204 [inline]
 ops_undo_list+0x525/0x990 net/core/net_namespace.c:251
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 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:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593
Code: ff ff ff e8 a3 b7 41 01 89 c5 31 ff 89 c6 e8 f8 95 91 f7 85 ed 74 45 e8 af 91 91 f7 eb 05 e8 a8 91 91 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 72 b3 f4 f7 49 8b 2c 24 49 8d 7c
RSP: 0018:ffffc900000e7098 EFLAGS: 00010216
RAX: 000000001fffe000 RBX: 1ffff1100fc27982 RCX: ffff88802eeb1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8fa08df7 R09: 1ffffffff1f411be
R10: dffffc0000000000 R11: fffffbfff1f411bf R12: 00000000ffff0000
R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88807e13cc10
FS:  0000000000000000(0000) GS:ffff888125c7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c333952 CR3: 00000000276f0000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e8 a3 b7 41 01       	call   0x141b7a8
   5:	89 c5                	mov    %eax,%ebp
   7:	31 ff                	xor    %edi,%edi
   9:	89 c6                	mov    %eax,%esi
   b:	e8 f8 95 91 f7       	call   0xf7919608
  10:	85 ed                	test   %ebp,%ebp
  12:	74 45                	je     0x59
  14:	e8 af 91 91 f7       	call   0xf79191c8
  19:	eb 05                	jmp    0x20
  1b:	e8 a8 91 91 f7       	call   0xf79191c8
  20:	4c 89 e0             	mov    %r12,%rax
  23:	48 c1 e8 03          	shr    $0x3,%rax
* 27:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2c:	74 08                	je     0x36
  2e:	4c 89 e7             	mov    %r12,%rdi
  31:	e8 72 b3 f4 f7       	call   0xf7f4b3a8
  36:	49 8b 2c 24          	mov    (%r12),%rbp
  3a:	49                   	rex.WB
  3b:	8d                   	.byte 0x8d
  3c:	7c                   	.byte 0x7c