=============================
WARNING: suspicious RCU usage
5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0 Not tainted
-----------------------------
net/ipv6/addrconf.c:5175 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor.2/19540:
 #0: ffffffff8dbbf4a8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xd0/0xc40 net/netlink/af_netlink.c:2223

stack backtrace:
CPU: 0 PID: 19540 Comm: syz-executor.2 Not tainted 5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 in6_dump_addrs+0x18af/0x1bd0 net/ipv6/addrconf.c:5175
 inet6_dump_addr+0x1428/0x1540 net/ipv6/addrconf.c:5300
 netlink_dump+0x608/0xc40 net/netlink/af_netlink.c:2275
 __netlink_dump_start+0x542/0x710 net/netlink/af_netlink.c:2380
 netlink_dump_start include/linux/netlink.h:245 [inline]
 rtnetlink_rcv_msg+0xc07/0xea0 net/core/rtnetlink.c:6046
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2501
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x597/0x8e0 net/socket.c:2492
 ___sys_sendmsg net/socket.c:2546 [inline]
 __sys_sendmsg+0x284/0x370 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8bf6089109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8bf717a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8bf619bf60 RCX: 00007f8bf6089109
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f8bf60e305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffece58ef4f R14: 00007f8bf717a300 R15: 0000000000022000
 </TASK>

=============================
WARNING: suspicious RCU usage
5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0 Not tainted
-----------------------------
net/ipv6/addrconf.c:5177 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor.2/19540:
 #0: ffffffff8dbbf4a8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xd0/0xc40 net/netlink/af_netlink.c:2223

stack backtrace:
CPU: 1 PID: 19540 Comm: syz-executor.2 Not tainted 5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 in6_dump_addrs+0x128f/0x1bd0 net/ipv6/addrconf.c:5177
 inet6_dump_addr+0x1428/0x1540 net/ipv6/addrconf.c:5300
 netlink_dump+0x608/0xc40 net/netlink/af_netlink.c:2275
 __netlink_dump_start+0x542/0x710 net/netlink/af_netlink.c:2380
 netlink_dump_start include/linux/netlink.h:245 [inline]
 rtnetlink_rcv_msg+0xc07/0xea0 net/core/rtnetlink.c:6046
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2501
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x597/0x8e0 net/socket.c:2492
 ___sys_sendmsg net/socket.c:2546 [inline]
 __sys_sendmsg+0x284/0x370 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8bf6089109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8bf717a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8bf619bf60 RCX: 00007f8bf6089109
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f8bf60e305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffece58ef4f R14: 00007f8bf717a300 R15: 0000000000022000
 </TASK>