============================= WARNING: suspicious RCU usage 5.12.0-rc4-syzkaller #0 Not tainted ----------------------------- include/linux/skmsg.h:286 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.4/4554: #0: ffff88801b86d0c8 (clock-AF_INET){++..}-{2:2}, at: sk_psock_drop+0x2c/0x460 net/core/skmsg.c:788 stack backtrace: CPU: 0 PID: 4554 Comm: syz-executor.4 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 sk_psock include/linux/skmsg.h:286 [inline] udp_bpf_update_proto+0x244/0x3c0 net/ipv4/udp_bpf.c:109 sk_psock_restore_proto include/linux/skmsg.h:408 [inline] sk_psock_drop+0xdf/0x460 net/core/skmsg.c:789 sk_psock_put include/linux/skmsg.h:446 [inline] udp_bpf_recvmsg+0x607/0x770 net/ipv4/udp_bpf.c:66 inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:852 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_recvmsg net/socket.c:902 [inline] sock_read_iter+0x33c/0x470 net/socket.c:979 call_read_iter include/linux/fs.h:1971 [inline] do_iter_readv_writev+0x56a/0x740 fs/read_write.c:738 do_iter_read+0x285/0x6e0 fs/read_write.c:801 vfs_readv+0xe5/0x150 fs/read_write.c:921 do_readv+0x27f/0x300 fs/read_write.c:958 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe5dbc1b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000001 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc458fa60f R14: 00007fe5dbc1b300 R15: 0000000000022000