=============================
WARNING: suspicious RCU usage
6.0.0-rc1-next-20220818-syzkaller #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
5 locks held by syz-executor319/3609:
 #0: ffff88806cc46810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #0: ffff88806cc46810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:649
 #1: ffff888026668bf0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1687 [inline]
 #1: ffff888026668bf0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: dccp_close+0x7e/0xd50 net/dccp/proto.c:980
 #2: ffff88802659e690 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
 #2: ffff88802659e690 (&h->lhash2[i].lock){+.+.}-{2:2}, at: inet_unhash+0x345/0x680 net/ipv4/inet_hashtables.c:651
 #3: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline]
 #3: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 net/core/sock_reuseport.c:346
 #4: ffff888026668e78 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 kernel/bpf/reuseport_array.c:26

stack backtrace:
CPU: 0 PID: 3609 Comm: syz-executor319 Not tainted 6.0.0-rc1-next-20220818-syzkaller #0
syz-executor319[3609] cmdline: ��a�����

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:122 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:140
 __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
 reuseport_stop_listen_sock+0x6d/0x500 net/core/sock_reuseport.c:408
 inet_unhash+0x3b1/0x680 net/ipv4/inet_hashtables.c:658
 dccp_set_state+0x2af/0x3a0 net/dccp/proto.c:100
 dccp_close+0xa23/0xd50 net/dccp/proto.c:985
 inet_release+0x12e/0x270 net/ipv4/af_inet.c:428
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:482
 __sock_release+0xcd/0x280 net/socket.c:650
 sock_close+0x18/0x20 net/socket.c:1365
 __fput+0x27c/0xa90 fs/file_table.c:320
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xc39/0x2b60 kernel/exit.c:814
 do_group_exit+0xd0/0x2a0 kernel/exit.c:944
 __do_sys_exit_group kernel/exit.c:955 [inline]
 __se_sys_exit_group kernel/exit.c:953 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:953
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f468a44e639
Code: Unable to access opcode bytes at RIP 0x7f468a44e60f.
RSP: 002b:00007ffcc541def8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: fffffffff