[ 740.210951][ T8323] veth7: left promiscuous mode [ 748.831034][ T8441] [ 748.831149][ T8441] ============================= [ 748.831283][ T8441] WARNING: suspicious RCU usage [ 748.831411][ T8441] 7.0.0-rc3-virtme #1 Not tainted [ 748.831538][ T8441] ----------------------------- [ 748.831664][ T8441] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 748.831854][ T8441] [ 748.831854][ T8441] other info that might help us debug this: [ 748.831854][ T8441] [ 748.832524][ T8441] [ 748.832524][ T8441] rcu_scheduler_active = 2, debug_locks = 1 [ 748.832713][ T8441] 1 lock held by ip/8441: [ 748.832817][ T8441] #0: ffffffffb947f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 748.833062][ T8441] [ 748.833062][ T8441] stack backtrace: [ 748.833220][ T8441] CPU: 0 UID: 0 PID: 8441 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 748.833223][ T8441] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 748.833225][ T8441] Call Trace: [ 748.833226][ T8441] [ 748.833228][ T8441] dump_stack_lvl+0x6f/0xa0 [ 748.833234][ T8441] lockdep_rcu_suspicious.cold+0x4f/0xad [ 748.833240][ T8441] fib6_update_sernum+0xfb/0x130 [ 748.833243][ T8441] nh_rt_cache_flush+0x8d/0x380 [ 748.833248][ T8441] replace_nexthop+0x347/0x6e0 [ 748.833253][ T8441] insert_nexthop+0x41e/0x7a0 [ 748.833256][ T8441] rtm_new_nexthop+0x3a0/0x8c0 [ 748.833260][ T8441] ? insert_nexthop+0x7a0/0x7a0 [ 748.833261][ T8441] ? lock_acquire.part.0+0xbc/0x260 [ 748.833265][ T8441] ? find_held_lock+0x2b/0x80 [ 748.833270][ T8441] ? lock_acquire.part.0+0xbc/0x260 [ 748.833272][ T8441] ? find_held_lock+0x2b/0x80 [ 748.833277][ T8441] ? find_held_lock+0x2b/0x80 [ 748.833278][ T8441] ? insert_nexthop+0x7a0/0x7a0 [ 748.833280][ T8441] ? __lock_release.isra.0+0x59/0x170 [ 748.833284][ T8441] ? insert_nexthop+0x7a0/0x7a0 [ 748.833286][ T8441] rtnetlink_rcv_msg+0x6fe/0xb90 [ 748.833290][ T8441] ? rtnl_fdb_dump+0x620/0x620 [ 748.833293][ T8441] ? __lock_acquire+0x577/0xc10 [ 748.833296][ T8441] ? lock_acquire.part.0+0xbc/0x260 [ 748.833298][ T8441] ? find_held_lock+0x2b/0x80 [ 748.833301][ T8441] netlink_rcv_skb+0x123/0x380 [ 748.833304][ T8441] ? rtnl_fdb_dump+0x620/0x620 [ 748.833308][ T8441] ? netlink_ack+0xce0/0xce0 [ 748.833314][ T8441] ? netlink_deliver_tap+0xc5/0x330 [ 748.833316][ T8441] ? netlink_deliver_tap+0x13f/0x330 [ 748.833320][ T8441] netlink_unicast+0x4a3/0x770 [ 748.833324][ T8441] ? netlink_attachskb+0x810/0x810 [ 748.833326][ T8441] ? __alloc_skb+0x4c4/0x5f0 [ 748.833329][ T8441] ? napi_skb_cache_get+0x7a0/0x7a0 [ 748.833332][ T8441] ? __lock_acquire+0x577/0xc10 [ 748.833336][ T8441] netlink_sendmsg+0x735/0xc60 [ 748.833340][ T8441] ? netlink_unicast+0x770/0x770 [ 748.833344][ T8441] ? __might_fault+0x97/0x140 [ 748.833349][ T8441] ____sys_sendmsg+0x419/0x850 [ 748.833352][ T8441] ? copy_msghdr_from_user+0x270/0x430 [ 748.833354][ T8441] ? get_timestamp.constprop.0+0x390/0x390 [ 748.833355][ T8441] ? move_addr_to_kernel+0x40/0x40 [ 748.833359][ T8441] ? lock_acquire.part.0+0xbc/0x260 [ 748.833361][ T8441] ? find_held_lock+0x2b/0x80 [ 748.833364][ T8441] ___sys_sendmsg+0xfd/0x180 [ 748.833366][ T8441] ? copy_msghdr_from_user+0x430/0x430 [ 748.833367][ T8441] ? __lock_release.isra.0+0x59/0x170 [ 748.833378][ T8441] ? lock_vma_under_rcu+0x128/0x3e0 [ 748.833383][ T8441] __sys_sendmsg+0x124/0x1c0 [ 748.833385][ T8441] ? __sys_sendmsg_sock+0x20/0x20 [ 748.833390][ T8441] ? do_user_addr_fault+0x799/0xdb0 [ 748.833394][ T8441] ? rcu_is_watching+0x15/0xd0 [ 748.833398][ T8441] ? rcu_is_watching+0x15/0xd0 [ 748.833401][ T8441] do_syscall_64+0x117/0xfc0 [ 748.833406][ T8441] ? exc_page_fault+0xaf/0xd0 [ 748.833409][ T8441] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 748.833411][ T8441] RIP: 0033:0x7f231e55ac5e [ 748.833415][ T8441] 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 [ 748.833416][ T8441] RSP: 002b:00007fffa6c318d0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 748.833419][ T8441] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f231e55ac5e [ 748.833420][ T8441] RDX: 0000000000000000 RSI: 00007fffa6c31990 RDI: 0000000000000005 [ 748.833421][ T8441] RBP: 00007fffa6c318e0 R08: 0000000000000000 R09: 0000000000000000 [ 748.833422][ T8441] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 748.833423][ T8441] R13: 0000000069b99de0 R14: 00007fffa6c32498 R15: 000000000049c620 [ 748.833429][ T8441]