Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f]
CPU: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.9.0-rc7-next-20240510-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: netns cleanup_net
RIP: 0010:__fib6_drop_pcpu_from+0x13e/0x270 net/ipv6/ip6_fib.c:984
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e8 f4 c8 f7 48 8b 1b 48 85 db 74 2f 48 81 c3 90 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 c3 f4 c8 f7 48 8b 03 4c 39 e0 74
RSP: 0018:ffffc90000106ce8 EFLAGS: 00010202
RAX: 0000000000000013 RBX: 0000000000000098 RCX: ffff888017283c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8ddb89e0 R08: ffffffff8a32dfda R09: 1ffffffff25f64c7
R10: dffffc0000000000 R11: fffffbfff25f64c8 R12: ffff88807de7c800
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88807de7c910
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f21420ffe00 CR3: 0000000054b62000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline]
 fib6_purge_rt+0x193/0x890 net/ipv6/ip6_fib.c:1038
 fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]
 fib6_del+0xe77/0x1600 net/ipv6/ip6_fib.c:2043
 fib6_clean_node+0x2f7/0x5e0 net/ipv6/ip6_fib.c:2205
 fib6_walk_continue+0x658/0x8f0 net/ipv6/ip6_fib.c:2127
 fib6_walk+0x168/0x2b0 net/ipv6/ip6_fib.c:2175
 fib6_clean_tree net/ipv6/ip6_fib.c:2255 [inline]
 __fib6_clean_all+0x31f/0x4b0 net/ipv6/ip6_fib.c:2271
 rt6_sync_down_dev net/ipv6/route.c:4903 [inline]
 rt6_disable_ip+0x170/0x890 net/ipv6/route.c:4908
 addrconf_ifdown+0x15d/0x1bc0 net/ipv6/addrconf.c:3855
 addrconf_notify+0x3cb/0x1020
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2031 [inline]
 call_netdevice_notifiers net/core/dev.c:2045 [inline]
 dev_close_many+0x33c/0x4c0 net/core/dev.c:1586
 unregister_netdevice_many_notify+0x544/0x16e0 net/core/dev.c:11202
 unregister_netdevice_many net/core/dev.c:11285 [inline]
 default_device_exit_batch+0xa0f/0xa90 net/core/dev.c:11768
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__fib6_drop_pcpu_from+0x13e/0x270 net/ipv6/ip6_fib.c:984
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e8 f4 c8 f7 48 8b 1b 48 85 db 74 2f 48 81 c3 90 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 c3 f4 c8 f7 48 8b 03 4c 39 e0 74
RSP: 0018:ffffc90000106ce8 EFLAGS: 00010202
RAX: 0000000000000013 RBX: 0000000000000098 RCX: ffff888017283c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8ddb89e0 R08: ffffffff8a32dfda R09: 1ffffffff25f64c7
R10: dffffc0000000000 R11: fffffbfff25f64c8 R12: ffff88807de7c800
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88807de7c910
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f21420ffe00 CR3: 0000000054b62000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	d8 48 c1             	fmuls  -0x3f(%rax)
   3:	e8 03 42 80 3c       	call   0x3c80420b
   8:	28 00                	sub    %al,(%rax)
   a:	74 08                	je     0x14
   c:	48 89 df             	mov    %rbx,%rdi
   f:	e8 e8 f4 c8 f7       	call   0xf7c8f4fc
  14:	48 8b 1b             	mov    (%rbx),%rbx
  17:	48 85 db             	test   %rbx,%rbx
  1a:	74 2f                	je     0x4b
  1c:	48 81 c3 90 00 00 00 	add    $0x90,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 c3 f4 c8 f7       	call   0xf7c8f4fc
  39:	48 8b 03             	mov    (%rbx),%rax
  3c:	4c 39 e0             	cmp    %r12,%rax
  3f:	74                   	.byte 0x74