[ 700.772417][T11314] gre: GRE over IPv4 demultiplexer driver [ 700.784618][T11314] ip_gre: GRE over IPv4 tunneling driver [ 710.016956][T11445] [ 710.017112][T11445] ============================= [ 710.017306][T11445] WARNING: suspicious RCU usage [ 710.017492][T11445] 7.0.0-rc1-virtme #1 Not tainted [ 710.017675][T11445] ----------------------------- [ 710.017871][T11445] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 710.018119][T11445] [ 710.018119][T11445] other info that might help us debug this: [ 710.018119][T11445] [ 710.018459][T11445] [ 710.018459][T11445] rcu_scheduler_active = 2, debug_locks = 1 [ 710.018696][T11445] 1 lock held by ip/11445: [ 710.018884][T11445] #0: ffffffffba67e6e8 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 710.019176][T11445] [ 710.019176][T11445] stack backtrace: [ 710.019382][T11445] CPU: 2 UID: 0 PID: 11445 Comm: ip Not tainted 7.0.0-rc1-virtme #1 PREEMPT(full) [ 710.019386][T11445] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 710.019388][T11445] Call Trace: [ 710.019390][T11445] [ 710.019392][T11445] dump_stack_lvl+0x6f/0xa0 [ 710.019399][T11445] lockdep_rcu_suspicious.cold+0x4f/0xad [ 710.019405][T11445] fib6_update_sernum+0xfb/0x130 [ 710.019408][T11445] nh_rt_cache_flush+0x8d/0x380 [ 710.019413][T11445] replace_nexthop+0x347/0x6e0 [ 710.019418][T11445] insert_nexthop+0x41e/0x7a0 [ 710.019421][T11445] rtm_new_nexthop+0x3a0/0x8c0 [ 710.019425][T11445] ? insert_nexthop+0x7a0/0x7a0 [ 710.019426][T11445] ? lock_acquire.part.0+0xbc/0x260 [ 710.019429][T11445] ? find_held_lock+0x2b/0x80 [ 710.019435][T11445] ? lock_acquire.part.0+0xbc/0x260 [ 710.019436][T11445] ? find_held_lock+0x2b/0x80 [ 710.019442][T11445] ? find_held_lock+0x2b/0x80 [ 710.019443][T11445] ? insert_nexthop+0x7a0/0x7a0 [ 710.019445][T11445] ? __lock_release.isra.0+0x59/0x170 [ 710.019448][T11445] ? insert_nexthop+0x7a0/0x7a0 [ 710.019450][T11445] rtnetlink_rcv_msg+0x6fe/0xb90 [ 710.019455][T11445] ? rtnl_fdb_dump+0x620/0x620 [ 710.019458][T11445] ? __lock_acquire+0x577/0xc10 [ 710.019462][T11445] ? lock_acquire.part.0+0xbc/0x260 [ 710.019463][T11445] ? find_held_lock+0x2b/0x80 [ 710.019466][T11445] netlink_rcv_skb+0x123/0x380 [ 710.019470][T11445] ? rtnl_fdb_dump+0x620/0x620 [ 710.019473][T11445] ? netlink_ack+0xcc0/0xcc0 [ 710.019479][T11445] ? netlink_deliver_tap+0xc5/0x330 [ 710.019481][T11445] ? netlink_deliver_tap+0x13f/0x330 [ 710.019485][T11445] netlink_unicast+0x4a3/0x770 [ 710.019489][T11445] ? netlink_attachskb+0x810/0x810 [ 710.019491][T11445] ? __alloc_skb+0x4cd/0x600 [ 710.019494][T11445] ? napi_skb_cache_get+0x7a0/0x7a0 [ 710.019496][T11445] ? __lock_acquire+0x577/0xc10 [ 710.019500][T11445] netlink_sendmsg+0x735/0xc60 [ 710.019503][T11445] ? netlink_unicast+0x770/0x770 [ 710.019507][T11445] ? __might_fault+0x97/0x140 [ 710.019513][T11445] ____sys_sendmsg+0x419/0x850 [ 710.019515][T11445] ? copy_msghdr_from_user+0x270/0x430 [ 710.019517][T11445] ? get_timestamp.constprop.0+0x3a0/0x3a0 [ 710.019519][T11445] ? move_addr_to_kernel+0x40/0x40 [ 710.019523][T11445] ? lock_acquire.part.0+0xbc/0x260 [ 710.019524][T11445] ? find_held_lock+0x2b/0x80 [ 710.019527][T11445] ___sys_sendmsg+0xfd/0x180 [ 710.019529][T11445] ? copy_msghdr_from_user+0x430/0x430 [ 710.019531][T11445] ? __lock_release.isra.0+0x59/0x170 [ 710.019541][T11445] ? lock_vma_under_rcu+0x128/0x3e0 [ 710.019546][T11445] __sys_sendmsg+0x124/0x1c0 [ 710.019549][T11445] ? __sys_sendmsg_sock+0x20/0x20 [ 710.019554][T11445] ? do_user_addr_fault+0x799/0xdb0 [ 710.019558][T11445] ? rcu_is_watching+0x15/0xd0 [ 710.019561][T11445] ? rcu_is_watching+0x15/0xd0 [ 710.019565][T11445] do_syscall_64+0x117/0xfc0 [ 710.019569][T11445] ? exc_page_fault+0xaf/0xd0 [ 710.019572][T11445] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 710.019575][T11445] RIP: 0033:0x7f24f004cc5e [ 710.019579][T11445] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa [ 710.019580][T11445] RSP: 002b:00007ffd18664ac0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 710.019583][T11445] RAX: ffffffffffffffda RBX: 000000000048a910 RCX: 00007f24f004cc5e [ 710.019585][T11445] RDX: 0000000000000000 RSI: 00007ffd18664b80 RDI: 0000000000000005 [ 710.019586][T11445] RBP: 00007ffd18664ad0 R08: 0000000000000000 R09: 0000000000000000 [ 710.019587][T11445] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 710.019587][T11445] R13: 0000000069a4846c R14: 0000000039d26310 R15: 000000000049b620 [ 710.019593][T11445]