[ 2100.304492][T18197] [ 2100.304859][T18197] ============================= [ 2100.305029][T18197] WARNING: suspicious RCU usage [ 2100.305353][T18197] 7.2.0-rc2-virtme #1 Not tainted [ 2100.305513][T18197] ----------------------------- [ 2100.305697][T18197] drivers/net/vxlan/vxlan_core.c:1872 suspicious rcu_dereference_check() usage! [ 2100.305940][T18197] [ 2100.305940][T18197] other info that might help us debug this: [ 2100.305940][T18197] [ 2100.306206][T18197] [ 2100.306206][T18197] rcu_scheduler_active = 2, debug_locks = 1 [ 2100.306427][T18197] 1 lock held by arping/18197: [ 2100.306615][T18197] #0: ffffffffa9591d60 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x206/0x1b70 [ 2100.306879][T18197] [ 2100.306879][T18197] stack backtrace: [ 2100.307074][T18197] CPU: 2 UID: 0 PID: 18197 Comm: arping Not tainted 7.2.0-rc2-virtme #1 PREEMPT(full) [ 2100.307078][T18197] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2100.307081][T18197] Call Trace: [ 2100.307083][T18197] [ 2100.307085][T18197] dump_stack_lvl+0x6f/0xa0 [ 2100.307092][T18197] lockdep_rcu_suspicious.cold+0x37/0x89 [ 2100.307097][T18197] arp_reduce.isra.0+0x9b9/0x1080 [vxlan] [ 2100.307105][T18197] ? mark_usage+0x61/0x170 [ 2100.307110][T18197] ? __lock_acquire+0x518/0xc20 [ 2100.307114][T18197] ? vxlan_nl2conf+0x5b30/0x5b30 [vxlan] [ 2100.307119][T18197] ? lock_acquire.part.0+0xbc/0x260 [ 2100.307121][T18197] ? find_held_lock+0x2b/0x80 [ 2100.307125][T18197] ? __lock_release.isra.0+0x6b/0x1a0 [ 2100.307128][T18197] ? vxlan_xmit+0x128b/0x1660 [vxlan] [ 2100.307133][T18197] vxlan_xmit+0x128b/0x1660 [vxlan] [ 2100.307138][T18197] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 2100.307143][T18197] dev_hard_start_xmit+0xf4/0x620 [ 2100.307146][T18197] ? validate_xmit_skb+0x72/0x9a0 [ 2100.307149][T18197] __dev_queue_xmit+0xc04/0x1b70 [ 2100.307151][T18197] ? _copy_from_iter+0x1bb/0x1810 [ 2100.307155][T18197] ? __alloc_skb+0x342/0x5f0 [ 2100.307159][T18197] ? _copy_from_iter_flushcache+0x1970/0x1970 [ 2100.307161][T18197] ? ref_tracker_alloc+0x2e7/0x430 [ 2100.307164][T18197] ? netdev_core_pick_tx+0x2c0/0x2c0 [ 2100.307168][T18197] ? packet_parse_headers+0x325/0x830 [ 2100.307171][T18197] ? __asan_memset+0x27/0x50 [ 2100.307174][T18197] ? packet_parse_headers+0x325/0x830 [ 2100.307177][T18197] ? skb_copy_datagram_from_iter+0xf3/0x6a0 [ 2100.307180][T18197] ? packet_release+0xc70/0xc70 [ 2100.307184][T18197] packet_snd+0xfad/0x1990 [ 2100.307189][T18197] ? tpacket_snd+0x19e0/0x19e0 [ 2100.307191][T18197] ? __might_fault+0x97/0x140 [ 2100.307197][T18197] ? __might_fault+0x97/0x140 [ 2100.307199][T18197] ? __might_fault+0x97/0x140 [ 2100.307203][T18197] __sys_sendto+0x2aa/0x400 [ 2100.307206][T18197] ? __ia32_sys_getpeername+0xd0/0xd0 [ 2100.307214][T18197] ? do_user_addr_fault+0x325/0xe30 [ 2100.307220][T18197] __x64_sys_sendto+0xe4/0x1f0 [ 2100.307222][T18197] ? trace_irq_enable.constprop.0+0x9b/0x160 [ 2100.307225][T18197] ? lockdep_hardirqs_on+0x8c/0x130 [ 2100.307228][T18197] ? do_syscall_64+0x82/0x590 [ 2100.307230][T18197] do_syscall_64+0x117/0x590 [ 2100.307232][T18197] ? trace_hardirqs_off+0xd/0x30 [ 2100.307234][T18197] ? exc_page_fault+0xee/0x100 [ 2100.307236][T18197] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2100.307238][T18197] RIP: 0033:0x7f21a5faf54e [ 2100.307242][T18197] Code: 4d 89 d8 e8 b4 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 03 ff ff ff 0f 1f 00 f3 0f 1e fa [ 2100.307244][T18197] RSP: 002b:00007fff3343dcc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 2100.307247][T18197] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f21a5faf54e [ 2100.307248][T18197] RDX: 000000000000001c RSI: 00007fff3343dd40 RDI: 0000000000000005 [ 2100.307249][T18197] RBP: 00007fff3343dcd0 R08: 00007fff3343e1c0 R09: 0000000000000014 [ 2100.307250][T18197] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 2100.307251][T18197] R13: 00007fff3343e0f0 R14: ffffffffffffffe8 R15: 0000000000000000 [ 2100.307257][T18197]