[ 482.614092][ T2502] [ 482.614326][ T2502] ============================= [ 482.615301][ T2502] WARNING: suspicious RCU usage [ 482.615622][ T2502] 7.0.0-rc1-virtme #1 Not tainted [ 482.615936][ T2502] ----------------------------- [ 482.616246][ T2502] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 482.616704][ T2502] [ 482.616704][ T2502] other info that might help us debug this: [ 482.616704][ T2502] [ 482.617271][ T2502] [ 482.617271][ T2502] rcu_scheduler_active = 2, debug_locks = 1 [ 482.617738][ T2502] 1 lock held by ip/2502: [ 482.617996][ T2502] #0: ffffffffaae7e6e8 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 482.618474][ T2502] [ 482.618474][ T2502] stack backtrace: [ 482.618847][ T2502] CPU: 2 UID: 0 PID: 2502 Comm: ip Not tainted 7.0.0-rc1-virtme #1 PREEMPT(full) [ 482.618852][ T2502] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 482.618855][ T2502] Call Trace: [ 482.618857][ T2502] [ 482.618861][ T2502] dump_stack_lvl+0x6f/0xa0 [ 482.618870][ T2502] lockdep_rcu_suspicious.cold+0x4f/0xad [ 482.618879][ T2502] fib6_update_sernum+0xfb/0x130 [ 482.618886][ T2502] nh_rt_cache_flush+0x8d/0x380 [ 482.618894][ T2502] replace_nexthop+0x347/0x6e0 [ 482.618902][ T2502] insert_nexthop+0x41e/0x7a0 [ 482.618909][ T2502] rtm_new_nexthop+0x3a0/0x8c0 [ 482.618915][ T2502] ? insert_nexthop+0x7a0/0x7a0 [ 482.618917][ T2502] ? lock_acquire.part.0+0xbc/0x260 [ 482.618922][ T2502] ? find_held_lock+0x2b/0x80 [ 482.618933][ T2502] ? lock_acquire.part.0+0xbc/0x260 [ 482.618935][ T2502] ? find_held_lock+0x2b/0x80 [ 482.618946][ T2502] ? find_held_lock+0x2b/0x80 [ 482.618949][ T2502] ? insert_nexthop+0x7a0/0x7a0 [ 482.618952][ T2502] ? __lock_release.isra.0+0x59/0x170 [ 482.618959][ T2502] ? insert_nexthop+0x7a0/0x7a0 [ 482.618962][ T2502] rtnetlink_rcv_msg+0x6fe/0xb90 [ 482.618970][ T2502] ? rtnl_fdb_dump+0x620/0x620 [ 482.618974][ T2502] ? __lock_acquire+0x577/0xc10 [ 482.618981][ T2502] ? lock_acquire.part.0+0xbc/0x260 [ 482.618983][ T2502] ? find_held_lock+0x2b/0x80 [ 482.618989][ T2502] netlink_rcv_skb+0x123/0x380 [ 482.618994][ T2502] ? rtnl_fdb_dump+0x620/0x620 [ 482.618999][ T2502] ? netlink_ack+0xcc0/0xcc0 [ 482.619011][ T2502] ? netlink_deliver_tap+0xc5/0x330 [ 482.619014][ T2502] ? netlink_deliver_tap+0x13f/0x330 [ 482.619022][ T2502] netlink_unicast+0x4a3/0x770 [ 482.619029][ T2502] ? netlink_attachskb+0x810/0x810 [ 482.619031][ T2502] ? __alloc_skb+0x4cd/0x600 [ 482.619036][ T2502] ? napi_skb_cache_get+0x7a0/0x7a0 [ 482.619041][ T2502] ? __lock_acquire+0x577/0xc10 [ 482.619048][ T2502] netlink_sendmsg+0x735/0xc60 [ 482.619054][ T2502] ? netlink_unicast+0x770/0x770 [ 482.619061][ T2502] ? __might_fault+0x97/0x140 [ 482.619070][ T2502] ____sys_sendmsg+0x419/0x850 [ 482.619075][ T2502] ? copy_msghdr_from_user+0x270/0x430 [ 482.619078][ T2502] ? get_timestamp.constprop.0+0x3a0/0x3a0 [ 482.619080][ T2502] ? move_addr_to_kernel+0x40/0x40 [ 482.619088][ T2502] ? lock_acquire.part.0+0xbc/0x260 [ 482.619091][ T2502] ? find_held_lock+0x2b/0x80 [ 482.619097][ T2502] ___sys_sendmsg+0xfd/0x180 [ 482.619101][ T2502] ? copy_msghdr_from_user+0x430/0x430 [ 482.619103][ T2502] ? __lock_release.isra.0+0x59/0x170 [ 482.619125][ T2502] ? lock_vma_under_rcu+0x128/0x3e0 [ 482.619133][ T2502] __sys_sendmsg+0x124/0x1c0 [ 482.619138][ T2502] ? __sys_sendmsg_sock+0x20/0x20 [ 482.619147][ T2502] ? do_user_addr_fault+0x799/0xdb0 [ 482.619152][ T2502] ? rcu_is_watching+0x15/0xd0 [ 482.619157][ T2502] ? rcu_is_watching+0x15/0xd0 [ 482.619163][ T2502] do_syscall_64+0x117/0xfc0 [ 482.619169][ T2502] ? exc_page_fault+0xaf/0xd0 [ 482.619173][ T2502] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 482.619177][ T2502] RIP: 0033:0x7f28bc1d0c5e [ 482.619182][ T2502] 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 [ 482.619185][ T2502] RSP: 002b:00007ffdccbc94a0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 482.619190][ T2502] RAX: ffffffffffffffda RBX: 000000000048a910 RCX: 00007f28bc1d0c5e [ 482.619192][ T2502] RDX: 0000000000000000 RSI: 00007ffdccbc9560 RDI: 0000000000000005 [ 482.619194][ T2502] RBP: 00007ffdccbc94b0 R08: 0000000000000000 R09: 0000000000000000 [ 482.619195][ T2502] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 482.619196][ T2502] R13: 0000000069a4832f R14: 000000001d8ab310 R15: 000000000049b620 [ 482.619209][ T2502]