============================= WARNING: suspicious RCU usage 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #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.5/20713: #0: ffff88803d06fa10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #0: ffff88803d06fa10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:649 [inline] #0: ffff88803d06fa10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x93/0x260 net/socket.c:1365 #1: ffffc900014c1c38 (&table->hash[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline] #1: ffffc900014c1c38 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x19d/0x690 net/ipv4/udp.c:2014 #2: ffffffff8dde1078 (reuseport_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:354 [inline] #2: ffffffff8dde1078 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x24/0x510 net/core/sock_reuseport.c:346 #3: ffff888076eb53b8 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x2b/0x140 kernel/bpf/reuseport_array.c:26 stack backtrace: CPU: 0 PID: 20713 Comm: syz-executor.5 Not tainted 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 __rcu_dereference_sk_user_data_with_flags include/net/sock.h:592 [inline] bpf_sk_reuseport_detach+0x13a/0x140 kernel/bpf/reuseport_array.c:27 reuseport_detach_sock+0x90/0x510 net/core/sock_reuseport.c:362 udp_lib_unhash+0x1d7/0x690 net/ipv4/udp.c:2016 sk_common_release+0x9d/0x2d0 net/core/sock.c:3600 inet_release+0x184/0x1e0 net/ipv4/af_inet.c:428 __sock_release net/socket.c:650 [inline] sock_close+0xd7/0x260 net/socket.c:1365 __fput+0x3b9/0x820 fs/file_table.c:320 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8669e3bebb 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:00007ffcec5becc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f8669e3bebb RDX: 00007f8669fa0bc0 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f8669f9d980 R08: 0000000000000000 R09: 00007f8669fa0bc8 R10: 00007ffcec5bedc0 R11: 0000000000000293 R12: 00000000000853ce R13: 00007ffcec5bedc0 R14: 00007f8669f9bf80 R15: 0000000000000032