[ 21.344365][ T663] [ 21.344674][ T663] ============================= [ 21.344853][ T663] WARNING: suspicious RCU usage [ 21.345028][ T663] 6.14.0-rc6-virtme #1 Not tainted [ 21.345218][ T663] ----------------------------- [ 21.345414][ T663] ./include/net/net_namespace.h:418 suspicious rcu_dereference_check() usage! [ 21.345723][ T663] [ 21.345723][ T663] other info that might help us debug this: [ 21.345723][ T663] [ 21.346074][ T663] [ 21.346074][ T663] rcu_scheduler_active = 2, debug_locks = 1 [ 21.346338][ T663] 2 locks held by tun/663: [ 21.346517][ T663] #0: ffffffff9176f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x1f5/0x18d0 [ 21.346863][ T663] #1: ffff88800a802258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb+0x952/0x10a0 [ 21.347513][ T663] [ 21.347513][ T663] stack backtrace: [ 21.347733][ T663] CPU: 1 UID: 0 PID: 663 Comm: tun Not tainted 6.14.0-rc6-virtme #1 [ 21.347738][ T663] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 21.347740][ T663] Call Trace: [ 21.347742][ T663] [ 21.347745][ T663] dump_stack_lvl+0xb0/0xd0 [ 21.347755][ T663] lockdep_rcu_suspicious+0x1ea/0x280 [ 21.347768][ T663] dev_hard_start_xmit+0x2fc/0x3f0 [ 21.347780][ T663] sch_direct_xmit+0x212/0x11d0 [ 21.347789][ T663] ? tun_select_queue+0xf2/0x8e0 [ 21.347796][ T663] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 21.347802][ T663] ? __pfx_sch_direct_xmit+0x10/0x10 [ 21.347805][ T663] ? do_raw_spin_trylock+0xb9/0x190 [ 21.347813][ T663] ? lock_acquire+0x32/0xc0 [ 21.347815][ T663] ? __dev_xmit_skb+0x952/0x10a0 [ 21.347825][ T663] __dev_xmit_skb+0xaec/0x10a0 [ 21.347829][ T663] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 21.347836][ T663] ? __pfx___dev_xmit_skb+0x10/0x10 [ 21.347844][ T663] ? netdev_core_pick_tx+0x115/0x300 [ 21.347852][ T663] __dev_queue_xmit+0x788/0x18d0 [ 21.347865][ T663] ? sock_alloc_send_pskb+0x678/0x7f0 [ 21.347874][ T663] ? __pfx___dev_queue_xmit+0x10/0x10 [ 21.347879][ T663] ? packet_parse_headers+0x243/0x9d0 [ 21.347891][ T663] ? __pfx_sock_alloc_send_pskb+0x10/0x10 [ 21.347897][ T663] ? __pfx_packet_parse_headers+0x10/0x10 [ 21.347905][ T663] ? dev_get_by_index+0xb2/0x190 [ 21.347916][ T663] packet_snd+0xd0d/0x19c0 [ 21.347929][ T663] ? __lock_release+0x103/0x460 [ 21.347932][ T663] ? __might_fault+0x11b/0x170 [ 21.347939][ T663] ? __pfx_packet_snd+0x10/0x10 [ 21.347942][ T663] ? trace_lock_acquire+0x14c/0x1f0 [ 21.347950][ T663] ? lock_acquire+0x32/0xc0 [ 21.347956][ T663] ? __might_fault+0x11b/0x170 [ 21.347968][ T663] __sys_sendto+0x3c3/0x450 [ 21.347976][ T663] ? __pfx___sys_sendto+0x10/0x10 [ 21.347980][ T663] ? __might_fault+0x11b/0x170 [ 21.348001][ T663] ? fd_install+0x1d6/0x5a0 [ 21.348011][ T663] ? __x64_sys_openat+0x123/0x1e0 [ 21.348020][ T663] ? __pfx___x64_sys_openat+0x10/0x10 [ 21.348023][ T663] ? __pfx_ksys_write+0x10/0x10 [ 21.348032][ T663] __x64_sys_sendto+0xe0/0x1c0 [ 21.348037][ T663] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 21.348042][ T663] do_syscall_64+0xc1/0x1d0 [ 21.348051][ T663] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 21.348056][ T663] RIP: 0033:0x7fef78040a4a [ 21.348062][ T663] 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 [ 21.348065][ T663] RSP: 002b:00007fffa6285dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 21.348068][ T663] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fef78040a4a [ 21.348071][ T663] RDX: 0000000000000000 RSI: 00007fffa6285e54 RDI: 0000000000000006 [ 21.348072][ T663] RBP: 0000000000000022 R08: 00007fffa6285e20 R09: 0000000000000014 [ 21.348074][ T663] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 21.348076][ T663] R13: 000000000040a360 R14: 00007fef77ee6000 R15: 00007fef77ee6000 [ 21.348094][ T663]