Oops: general protection fault, probably for non-canonical address 0xdffffc000000002b: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000158-0x000000000000015f]
CPU: 0 UID: 0 PID: 20889 Comm: kworker/u8:35 Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_dst include/linux/skbuff.h:1144 [inline]
RIP: 0010:ip6_output+0x3a/0x3c0 net/ipv6/ip6_output.c:235
Code: ec 30 49 89 d6 48 89 74 24 08 49 89 fc 48 bb 00 00 00 00 00 fc ff df e8 04 5d 31 f7 4d 8d 7e 58 4d 89 fd 49 c1 ed 03 48 89 dd <41> 80 7c 1d 00 00 74 08 4c 89 ff e8 66 d8 97 f7 49 8b 1f 89 de 83
RSP: 0018:ffffc900000077f8 EFLAGS: 00010206
RAX: ffffffff8a8dc71c RBX: dffffc0000000000 RCX: ffff888026131e00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88806accdc80
RBP: dffffc0000000000 R08: ffffffff8a8fa478 R09: 1ffffffff203563e
R10: dffffc0000000000 R11: ffffffff8a8dc6f0 R12: ffff88806accdc80
R13: 000000000000002b R14: 0000000000000100 R15: 0000000000000158
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe3f951c7f CR3: 0000000064d7a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5672 [inline]
__netif_receive_skb+0x1ea/0x650 net/core/dev.c:5785
process_backlog+0x662/0x15b0 net/core/dev.c:6117
__napi_poll+0xcb/0x490 net/core/dev.c:6883
napi_poll net/core/dev.c:6952 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:7074
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
do_softirq+0x11b/0x1e0 kernel/softirq.c:462
</IRQ>
<TASK>
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:389
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]
__dev_queue_xmit+0x1775/0x3f50 net/core/dev.c:4461
dev_queue_xmit include/linux/netdevice.h:3212 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip6_finish_output2+0x1263/0x1780 net/ipv6/ip6_output.c:141
ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226
NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314
mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1860
ipv6_mc_dad_complete+0x88/0x490 net/ipv6/mcast.c:2286
addrconf_dad_completed+0x712/0xcd0 net/ipv6/addrconf.c:4361
addrconf_dad_work+0xdc2/0x16f0
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_dst include/linux/skbuff.h:1144 [inline]
RIP: 0010:ip6_output+0x3a/0x3c0 net/ipv6/ip6_output.c:235
Code: ec 30 49 89 d6 48 89 74 24 08 49 89 fc 48 bb 00 00 00 00 00 fc ff df e8 04 5d 31 f7 4d 8d 7e 58 4d 89 fd 49 c1 ed 03 48 89 dd <41> 80 7c 1d 00 00 74 08 4c 89 ff e8 66 d8 97 f7 49 8b 1f 89 de 83
RSP: 0018:ffffc900000077f8 EFLAGS: 00010206
RAX: ffffffff8a8dc71c RBX: dffffc0000000000 RCX: ffff888026131e00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88806accdc80
RBP: dffffc0000000000 R08: ffffffff8a8fa478 R09: 1ffffffff203563e
R10: dffffc0000000000 R11: ffffffff8a8dc6f0 R12: ffff88806accdc80
R13: 000000000000002b R14: 0000000000000100 R15: 0000000000000158
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe3f951c7f CR3: 0000000064d7a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 49 89 d6 mov %rdx,%r14
3: 48 89 74 24 08 mov %rsi,0x8(%rsp)
8: 49 89 fc mov %rdi,%r12
b: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
12: fc ff df
15: e8 04 5d 31 f7 call 0xf7315d1e
1a: 4d 8d 7e 58 lea 0x58(%r14),%r15
1e: 4d 89 fd mov %r15,%r13
21: 49 c1 ed 03 shr $0x3,%r13
25: 48 89 dd mov %rbx,%rbp
* 28: 41 80 7c 1d 00 00 cmpb $0x0,0x0(%r13,%rbx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ff mov %r15,%rdi
33: e8 66 d8 97 f7 call 0xf797d89e
38: 49 8b 1f mov (%r15),%rbx
3b: 89 de mov %ebx,%esi
3d: 83 .byte 0x83