bpfilter: read fail -512 ============================= WARNING: suspicious RCU usage 4.19.0-rc5+ #31 Not tainted ----------------------------- kernel/pid.c:330 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-executor5/11273: #0: 00000000a2c7cd4d (bpfilter_lock){+.+.}, at: __bpfilter_process_sockopt+0x1d0/0x387 net/bpfilter/bpfilter_kern.c:64 stack backtrace: CPU: 1 PID: 11273 Comm: syz-executor5 Not tainted 4.19.0-rc5+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4536 pid_task+0x1ce/0x200 kernel/pid.c:329 shutdown_umh.constprop.0+0x33/0x7c net/bpfilter/bpfilter_kern.c:26 __stop_umh net/bpfilter/bpfilter_kern.c:38 [inline] __bpfilter_process_sockopt.cold.1+0x9b/0xa0 net/bpfilter/bpfilter_kern.c:78 bpfilter_mbox_request+0x4d/0xb0 net/ipv4/bpfilter/sockopt.c:25 bpfilter_ip_get_sockopt+0x6b/0x90 net/ipv4/bpfilter/sockopt.c:42 ip_getsockopt+0x23c/0x2a0 net/ipv4/ip_sockglue.c:1566 raw_getsockopt+0xe2/0x100 net/ipv4/raw.c:891 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2997 __sys_getsockopt+0x1ad/0x390 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt net/socket.c:1947 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1947 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f96056f5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007f96056f66d4 RCX: 0000000000457679 RDX: 0000000000000043 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 000000000072bfa0 R08: 0000000020000780 R09: 0000000000000000 R10: 0000000020000740 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cd430 R14: 00000000004c7228 R15: 0000000000000001 bridge0: port 3(syz_tun) entered disabled state device syz_tun left promiscuous mode bridge0: port 3(syz_tun) entered disabled state IPVS: ftp: loaded support on port[0] = 21