============================= WARNING: suspicious RCU usage 4.14.106+ #30 Not tainted ----------------------------- net/ipv6/ip6_fib.c:1590 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor.5/2021: #0: (rtnl_mutex){+.+.}, at: [] dev_ioctl+0x260/0xca0 net/core/dev_ioctl.c:565 #1: (rcu_read_lock){....}, at: [] __fib6_clean_all+0x0/0x230 net/ipv6/ip6_fib.c:1823 #2: (&tb->tb6_lock){++--}, at: [] __fib6_clean_all+0xde/0x230 net/ipv6/ip6_fib.c:1837 stack backtrace: CPU: 0 PID: 2021 Comm: syz-executor.5 Not tainted 4.14.106+ #30 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 fib6_del+0x8c2/0xbe0 net/ipv6/ip6_fib.c:1590 fib6_clean_node+0x270/0x440 net/ipv6/ip6_fib.c:1777 fib6_walk_continue+0x3a5/0x5f0 net/ipv6/ip6_fib.c:1703 fib6_walk+0x8d/0xe0 net/ipv6/ip6_fib.c:1748 fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:1822 __fib6_clean_all+0xf5/0x230 net/ipv6/ip6_fib.c:1838 rt6_ifdown+0x90/0x5b0 net/ipv6/route.c:2868 addrconf_ifdown+0xc5/0x13b0 net/ipv6/addrconf.c:3602 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2048 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2053 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=2114 sclass=netlink_tcpdiag_socket pig=2128 comm=syz-executor.5 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=2114 sclass=netlink_tcpdiag_socket pig=2128 comm=syz-executor.5 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: security_context_str_to_sid(sysadm_u) failed for (dev bpf, type bpf) errno=-22 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=26159 sclass=netlink_route_socket pig=2264 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=26159 sclass=netlink_route_socket pig=2265 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=2311 comm=syz-executor.5 netlink: 17 bytes leftover after parsing attributes in process `syz-executor.5'.