[ 66.912013][ T1394] mpls_gso: MPLS GSO support [ 229.154613][ T8270] ip (8270) used greatest stack depth: 23896 bytes left [ 703.789291][T25134] [ 703.789592][T25134] ============================= [ 703.790004][T25134] WARNING: suspicious RCU usage [ 703.790201][T25134] 7.0.0-rc3-virtme #1 Not tainted [ 703.790384][T25134] ----------------------------- [ 703.790597][T25134] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 703.790843][T25134] [ 703.790843][T25134] other info that might help us debug this: [ 703.790843][T25134] [ 703.791159][T25134] [ 703.791159][T25134] rcu_scheduler_active = 2, debug_locks = 1 [ 703.791403][T25134] 1 lock held by ip/25134: [ 703.792011][T25134] #0: ffffffffb7ea2728 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 703.792304][T25134] [ 703.792304][T25134] stack backtrace: [ 703.792530][T25134] CPU: 2 UID: 0 PID: 25134 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 703.792534][T25134] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 703.792536][T25134] Call Trace: [ 703.792538][T25134] [ 703.792541][T25134] dump_stack_lvl+0x6f/0xa0 [ 703.792548][T25134] lockdep_rcu_suspicious.cold+0x4f/0xad [ 703.792553][T25134] fib6_update_sernum+0xfb/0x130 [ 703.792558][T25134] nh_rt_cache_flush+0x8d/0x380 [ 703.792562][T25134] replace_nexthop+0x347/0x6e0 [ 703.792567][T25134] insert_nexthop+0x41e/0x7a0 [ 703.792571][T25134] rtm_new_nexthop+0x3a0/0x8c0 [ 703.792575][T25134] ? insert_nexthop+0x7a0/0x7a0 [ 703.792577][T25134] ? lock_acquire.part.0+0xbc/0x260 [ 703.792580][T25134] ? find_held_lock+0x2b/0x80 [ 703.792587][T25134] ? lock_acquire.part.0+0xbc/0x260 [ 703.792588][T25134] ? find_held_lock+0x2b/0x80 [ 703.792594][T25134] ? find_held_lock+0x2b/0x80 [ 703.792596][T25134] ? insert_nexthop+0x7a0/0x7a0 [ 703.792599][T25134] ? __lock_release.isra.0+0x59/0x170 [ 703.792602][T25134] ? insert_nexthop+0x7a0/0x7a0 [ 703.792604][T25134] rtnetlink_rcv_msg+0x6fe/0xb90 [ 703.792609][T25134] ? rtnl_fdb_dump+0x620/0x620 [ 703.792612][T25134] ? __lock_acquire+0x577/0xc10 [ 703.792615][T25134] ? lock_acquire.part.0+0xbc/0x260 [ 703.792616][T25134] ? find_held_lock+0x2b/0x80 [ 703.792620][T25134] netlink_rcv_skb+0x123/0x380 [ 703.792623][T25134] ? rtnl_fdb_dump+0x620/0x620 [ 703.792626][T25134] ? netlink_ack+0xce0/0xce0 [ 703.792632][T25134] ? netlink_deliver_tap+0xc5/0x330 [ 703.792633][T25134] ? netlink_deliver_tap+0x13f/0x330 [ 703.792637][T25134] netlink_unicast+0x4a3/0x770 [ 703.792640][T25134] ? netlink_attachskb+0x810/0x810 [ 703.792641][T25134] ? __alloc_skb+0x4c4/0x5f0 [ 703.792645][T25134] ? napi_skb_cache_get+0x7a0/0x7a0 [ 703.792647][T25134] ? __lock_acquire+0x577/0xc10 [ 703.792651][T25134] netlink_sendmsg+0x735/0xc60 [ 703.792654][T25134] ? netlink_unicast+0x770/0x770 [ 703.792657][T25134] ? __might_fault+0x97/0x140 [ 703.792663][T25134] ____sys_sendmsg+0x419/0x850 [ 703.792666][T25134] ? copy_msghdr_from_user+0x270/0x430 [ 703.792668][T25134] ? get_timestamp.constprop.0+0x390/0x390 [ 703.792669][T25134] ? move_addr_to_kernel+0x40/0x40 [ 703.792673][T25134] ? lock_acquire.part.0+0xbc/0x260 [ 703.792674][T25134] ? find_held_lock+0x2b/0x80 [ 703.792678][T25134] ___sys_sendmsg+0xfd/0x180 [ 703.792681][T25134] ? copy_msghdr_from_user+0x430/0x430 [ 703.792682][T25134] ? __lock_release.isra.0+0x59/0x170 [ 703.792693][T25134] ? lock_vma_under_rcu+0x128/0x3e0 [ 703.792698][T25134] __sys_sendmsg+0x124/0x1c0 [ 703.792700][T25134] ? __sys_sendmsg_sock+0x20/0x20 [ 703.792706][T25134] ? do_user_addr_fault+0x799/0xdb0 [ 703.792710][T25134] ? rcu_is_watching+0x15/0xd0 [ 703.792713][T25134] ? rcu_is_watching+0x15/0xd0 [ 703.792716][T25134] do_syscall_64+0x117/0xfc0 [ 703.792720][T25134] ? exc_page_fault+0xaf/0xd0 [ 703.792723][T25134] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 703.792725][T25134] RIP: 0033:0x7f3efaee1c5e [ 703.792729][T25134] 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 [ 703.792731][T25134] RSP: 002b:00007ffde9ec6140 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 703.792734][T25134] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f3efaee1c5e [ 703.792736][T25134] RDX: 0000000000000000 RSI: 00007ffde9ec6200 RDI: 0000000000000005 [ 703.792737][T25134] RBP: 00007ffde9ec6150 R08: 0000000000000000 R09: 0000000000000000 [ 703.792738][T25134] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 703.792738][T25134] R13: 0000000069b99c01 R14: 000000003e799310 R15: 000000000049c620 [ 703.792745][T25134] [ 714.462904][T25611] ip (25611) used greatest stack depth: 23528 bytes left WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr