=============================
WARNING: suspicious RCU usage
5.19.0-syzkaller-14100-g0b20a133c094 #0 Not tainted
-----------------------------
include/net/sock.h:592 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
4 locks held by syz-executor.1/5389:
 #0: ffff888052d70210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:761 [inline]
 #0: ffff888052d70210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:649
 #1: ffffc900014d6778 (&table->hash[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline]
 #1: ffffc900014d6778 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash net/ipv4/udp.c:2014 [inline]
 #1: ffffc900014d6778 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 net/ipv4/udp.c:2004
 #2: ffffffff8d7bbe78 (reuseport_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline]
 #2: ffffffff8d7bbe78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 net/core/sock_reuseport.c:346
 #3: ffff88807a0727f8 (clock-AF_INET){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 kernel/bpf/reuseport_array.c:26

stack backtrace:
CPU: 1 PID: 5389 Comm: syz-executor.1 Not tainted 5.19.0-syzkaller-14100-g0b20a133c094 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 __rcu_dereference_sk_user_data_with_flags include/net/sock.h:592 [inline]
 bpf_sk_reuseport_detach+0x156/0x190 kernel/bpf/reuseport_array.c:27
 reuseport_detach_sock+0x8c/0x4a0 net/core/sock_reuseport.c:362
 udp_lib_unhash net/ipv4/udp.c:2016 [inline]
 udp_lib_unhash+0x210/0x730 net/ipv4/udp.c:2004
 sk_common_release+0xba/0x390 net/core/sock.c:3654
 inet_release+0x12e/0x270 net/ipv4/af_inet.c:428
 __sock_release+0xcd/0x280 net/socket.c:650
 sock_close+0x18/0x20 net/socket.c:1365
 __fput+0x277/0x9d0 fs/file_table.c:320
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f76de43bebb
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007fffeac77d90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f76de43bebb
RDX: 00007f76de5a02c0 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007f76de59d980 R08: 0000000000000000 R09: 00007f76de5a02c8
R10: 00007fffeac77e90 R11: 0000000000000293 R12: 0000000000028e3e
R13: 00007fffeac77e90 R14: 00007f76de59bf80 R15: 0000000000000032
 </TASK>