=============================
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
4 locks held by syz-executor280/3609:
 #0: ffff888073857a10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #0: ffff888073857a10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:649
 #1: ffffc900014f68e8 (&table->hash[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline]
 #1: ffffc900014f68e8 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash net/ipv4/udp.c:2014 [inline]
 #1: ffffc900014f68e8 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 net/ipv4/udp.c:2004
 #2: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline]
 #2: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 net/core/sock_reuseport.c:346
 #3: ffff88814b5eabb8 (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-executor280 Not tainted 6.0.0-rc1-next-20220818-syzkaller #0
syz-executor280[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
 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:3600
 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: 0033:0x7fb75c4166a9
Code: Unable to access opcode bytes at RIP 0x7fb75c41667f.
RSP: 002b:00007ffd688b1178 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fb75c48a270 RCX: 00007fb75c4166a9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fb75c48a270