============================= WARNING: suspicious RCU usage 5.12.0-rc6-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.2/23360: #0: ffff88801ebb1008 (clock-AF_INET6){++.-}-{2:2}, at: sk_psock_drop+0x2a/0x3d0 net/core/skmsg.c:789 stack backtrace: CPU: 1 PID: 23360 Comm: syz-executor.2 Not tainted 5.12.0-rc6-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] tcp_bpf_update_proto+0x5d3/0x6c0 net/ipv4/tcp_bpf.c:504 sk_psock_restore_proto include/linux/skmsg.h:407 [inline] sk_psock_drop+0x68/0x3d0 net/core/skmsg.c:790 sk_psock_put include/linux/skmsg.h:445 [inline] tcp_bpf_recvmsg+0x42d/0x480 net/ipv4/tcp_bpf.c:208 inet6_recvmsg+0x11b/0x5d0 net/ipv6/af_inet6.c:658 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_recvmsg net/socket.c:902 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2569 ___sys_recvmsg+0x127/0x200 net/socket.c:2611 do_recvmmsg+0x24d/0x6d0 net/socket.c:2705 __sys_recvmmsg net/socket.c:2784 [inline] __do_sys_recvmmsg net/socket.c:2807 [inline] __se_sys_recvmmsg net/socket.c:2800 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2800 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:00007f835f4bd188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000001 RSI: 0000000020001a40 RDI: 0000000000000005 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffda6b7bc4f R14: 00007f835f4bd300 R15: 0000000000022000