[ 10.290973][ T267] [ 10.291222][ T267] ============================= [ 10.291386][ T267] WARNING: suspicious RCU usage [ 10.291547][ T267] 6.14.0-rc6-virtme #1 Not tainted [ 10.291705][ T267] ----------------------------- [ 10.291861][ T267] ./include/net/net_namespace.h:418 suspicious rcu_dereference_check() usage! [ 10.292240][ T267] [ 10.292240][ T267] other info that might help us debug this: [ 10.292240][ T267] [ 10.292539][ T267] [ 10.292539][ T267] rcu_scheduler_active = 2, debug_locks = 1 [ 10.292777][ T267] 2 locks held by tun/267: [ 10.292936][ T267] #0: ffffffffbc16f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x1f5/0x18d0 [ 10.293268][ T267] #1: ffff88800dd35258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb+0x952/0x10a0 [ 10.293634][ T267] [ 10.293634][ T267] stack backtrace: [ 10.293827][ T267] CPU: 3 UID: 0 PID: 267 Comm: tun Not tainted 6.14.0-rc6-virtme #1 [ 10.293831][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.293833][ T267] Call Trace: [ 10.293836][ T267] [ 10.293839][ T267] dump_stack_lvl+0xb0/0xd0 [ 10.293850][ T267] lockdep_rcu_suspicious+0x1ea/0x280 [ 10.293862][ T267] dev_hard_start_xmit+0x2fc/0x3f0 [ 10.293874][ T267] sch_direct_xmit+0x212/0x11d0 [ 10.293883][ T267] ? tun_select_queue+0xf2/0x8e0 [ 10.293892][ T267] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.293898][ T267] ? __pfx_sch_direct_xmit+0x10/0x10 [ 10.293901][ T267] ? do_raw_spin_trylock+0xb9/0x190 [ 10.293909][ T267] ? lock_acquire+0x32/0xc0 [ 10.293911][ T267] ? __dev_xmit_skb+0x952/0x10a0 [ 10.293921][ T267] __dev_xmit_skb+0xaec/0x10a0 [ 10.293925][ T267] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.293931][ T267] ? __pfx___dev_xmit_skb+0x10/0x10 [ 10.293939][ T267] ? netdev_core_pick_tx+0x115/0x300 [ 10.293948][ T267] __dev_queue_xmit+0x788/0x18d0 [ 10.293960][ T267] ? sock_alloc_send_pskb+0x678/0x7f0 [ 10.293969][ T267] ? __pfx___dev_queue_xmit+0x10/0x10 [ 10.293973][ T267] ? packet_parse_headers+0x243/0x9d0 [ 10.293985][ T267] ? __pfx_sock_alloc_send_pskb+0x10/0x10 [ 10.293990][ T267] ? __pfx_packet_parse_headers+0x10/0x10 [ 10.293998][ T267] ? dev_get_by_index+0xb2/0x190 [ 10.294009][ T267] packet_snd+0xd0d/0x19c0 [ 10.294022][ T267] ? __lock_release+0x103/0x460 [ 10.294024][ T267] ? __might_fault+0x11b/0x170 [ 10.294032][ T267] ? __pfx_packet_snd+0x10/0x10 [ 10.294035][ T267] ? trace_lock_acquire+0x14c/0x1f0 [ 10.294043][ T267] ? lock_acquire+0x32/0xc0 [ 10.294049][ T267] ? __might_fault+0x11b/0x170 [ 10.294062][ T267] __sys_sendto+0x3c3/0x450 [ 10.294068][ T267] ? __pfx___sys_sendto+0x10/0x10 [ 10.294073][ T267] ? __might_fault+0x11b/0x170 [ 10.294094][ T267] ? fd_install+0x1d6/0x5a0 [ 10.294104][ T267] ? __x64_sys_openat+0x123/0x1e0 [ 10.294112][ T267] ? __pfx___x64_sys_openat+0x10/0x10 [ 10.294115][ T267] ? __pfx_ksys_write+0x10/0x10 [ 10.294124][ T267] __x64_sys_sendto+0xe0/0x1c0 [ 10.294129][ T267] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.294133][ T267] do_syscall_64+0xc1/0x1d0 [ 10.294141][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.294148][ T267] RIP: 0033:0x7f9df0ec6a4a [ 10.294152][ T267] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 [ 10.294154][ T267] RSP: 002b:00007ffce33d6e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 10.294159][ T267] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9df0ec6a4a [ 10.294161][ T267] RDX: 0000000000000000 RSI: 00007ffce33d6ef4 RDI: 0000000000000006 [ 10.294163][ T267] RBP: 0000000000000022 R08: 00007ffce33d6ec0 R09: 0000000000000014 [ 10.294165][ T267] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 10.294166][ T267] R13: 000000000040a360 R14: 00007f9df0d6c000 R15: 00007f9df0d6c000 [ 10.294184][ T267]