[ 301.292366][ T3861] [ 301.292484][ T3861] ============================= [ 301.292623][ T3861] WARNING: suspicious RCU usage [ 301.292763][ T3861] 7.0.0-rc3-virtme #1 Not tainted [ 301.292890][ T3861] ----------------------------- [ 301.293012][ T3861] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 301.293197][ T3861] [ 301.293197][ T3861] other info that might help us debug this: [ 301.293197][ T3861] [ 301.293443][ T3861] [ 301.293443][ T3861] rcu_scheduler_active = 2, debug_locks = 1 [ 301.293628][ T3861] 1 lock held by ip/3861: [ 301.293790][ T3861] #0: ffffffffa787f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 301.294032][ T3861] [ 301.294032][ T3861] stack backtrace: [ 301.294189][ T3861] CPU: 1 UID: 0 PID: 3861 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 301.294192][ T3861] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 301.294193][ T3861] Call Trace: [ 301.294195][ T3861] [ 301.294196][ T3861] dump_stack_lvl+0x6f/0xa0 [ 301.294202][ T3861] lockdep_rcu_suspicious.cold+0x4f/0xad [ 301.294208][ T3861] fib6_update_sernum+0xfb/0x130 [ 301.294212][ T3861] nh_rt_cache_flush+0x8d/0x380 [ 301.294217][ T3861] replace_nexthop+0x347/0x6e0 [ 301.294221][ T3861] insert_nexthop+0x41e/0x7a0 [ 301.294225][ T3861] rtm_new_nexthop+0x3a0/0x8c0 [ 301.294229][ T3861] ? insert_nexthop+0x7a0/0x7a0 [ 301.294230][ T3861] ? lock_acquire.part.0+0xbc/0x260 [ 301.294234][ T3861] ? find_held_lock+0x2b/0x80 [ 301.294240][ T3861] ? lock_acquire.part.0+0xbc/0x260 [ 301.294241][ T3861] ? find_held_lock+0x2b/0x80 [ 301.294247][ T3861] ? find_held_lock+0x2b/0x80 [ 301.294248][ T3861] ? insert_nexthop+0x7a0/0x7a0 [ 301.294250][ T3861] ? __lock_release.isra.0+0x59/0x170 [ 301.294254][ T3861] ? insert_nexthop+0x7a0/0x7a0 [ 301.294256][ T3861] rtnetlink_rcv_msg+0x6fe/0xb90 [ 301.294261][ T3861] ? rtnl_fdb_dump+0x620/0x620 [ 301.294263][ T3861] ? __lock_acquire+0x577/0xc10 [ 301.294267][ T3861] ? lock_acquire.part.0+0xbc/0x260 [ 301.294269][ T3861] ? find_held_lock+0x2b/0x80 [ 301.294272][ T3861] netlink_rcv_skb+0x123/0x380 [ 301.294276][ T3861] ? rtnl_fdb_dump+0x620/0x620 [ 301.294279][ T3861] ? netlink_ack+0xce0/0xce0 [ 301.294285][ T3861] ? netlink_deliver_tap+0xc5/0x330 [ 301.294287][ T3861] ? netlink_deliver_tap+0x13f/0x330 [ 301.294292][ T3861] netlink_unicast+0x4a3/0x770 [ 301.294296][ T3861] ? netlink_attachskb+0x810/0x810 [ 301.294298][ T3861] ? __alloc_skb+0x4c4/0x5f0 [ 301.294301][ T3861] ? napi_skb_cache_get+0x7a0/0x7a0 [ 301.294305][ T3861] ? __lock_acquire+0x577/0xc10 [ 301.294308][ T3861] netlink_sendmsg+0x735/0xc60 [ 301.294312][ T3861] ? netlink_unicast+0x770/0x770 [ 301.294316][ T3861] ? __might_fault+0x97/0x140 [ 301.294322][ T3861] ____sys_sendmsg+0x419/0x850 [ 301.294325][ T3861] ? copy_msghdr_from_user+0x270/0x430 [ 301.294327][ T3861] ? get_timestamp.constprop.0+0x390/0x390 [ 301.294328][ T3861] ? move_addr_to_kernel+0x40/0x40 [ 301.294332][ T3861] ? lock_acquire.part.0+0xbc/0x260 [ 301.294334][ T3861] ? find_held_lock+0x2b/0x80 [ 301.294337][ T3861] ___sys_sendmsg+0xfd/0x180 [ 301.294340][ T3861] ? copy_msghdr_from_user+0x430/0x430 [ 301.294341][ T3861] ? __lock_release.isra.0+0x59/0x170 [ 301.294352][ T3861] ? lock_vma_under_rcu+0x128/0x3e0 [ 301.294357][ T3861] __sys_sendmsg+0x124/0x1c0 [ 301.294360][ T3861] ? __sys_sendmsg_sock+0x20/0x20 [ 301.294365][ T3861] ? do_user_addr_fault+0x799/0xdb0 [ 301.294369][ T3861] ? rcu_is_watching+0x15/0xd0 [ 301.294373][ T3861] ? rcu_is_watching+0x15/0xd0 [ 301.294376][ T3861] do_syscall_64+0x117/0xfc0 [ 301.294380][ T3861] ? exc_page_fault+0xaf/0xd0 [ 301.294383][ T3861] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 301.294385][ T3861] RIP: 0033:0x7f0a0adedc5e [ 301.294389][ T3861] 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 [ 301.294390][ T3861] RSP: 002b:00007ffcffd8ecb0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 301.294393][ T3861] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f0a0adedc5e [ 301.294395][ T3861] RDX: 0000000000000000 RSI: 00007ffcffd8ed70 RDI: 0000000000000005 [ 301.294396][ T3861] RBP: 00007ffcffd8ecc0 R08: 0000000000000000 R09: 0000000000000000 [ 301.294396][ T3861] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 301.294397][ T3861] R13: 0000000069b99de4 R14: 00007ffcffd8f868 R15: 000000000049c620 [ 301.294403][ T3861]