program: r0 = socket$nl_xfrm(0x10, 0x3, 0x6) sendmsg$nl_xfrm(r0, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000380)={&(0x7f0000000000)=@newsa={0x150, 0x10, 0x1, 0x0, 0x0, {{@in=@loopback, @in=@loopback, 0x0, 0x0, 0x0, 0x0, 0x2, 0x20, 0x20}, {@in=@loopback, 0xbe3412, 0x32}, @in=@loopback, {}, {}, {}, 0x0, 0x1, 0x2}, [@algo_aead={0x60, 0x12, {{'rfc4106(gcm(aes))\x00'}, 0xa0, 0x60, "210466d38547aa140db9a200000000c538c7cb7a"}}]}, 0x150}}, 0x0) sendmsg$nl_xfrm(r0, &(0x7f0000000500)={0x0, 0x0, &(0x7f0000000400)={&(0x7f0000000000)=ANY=[@ANYBLOB="940000002900010000000000000000007f00000100000000000000000000000000be3412020032007f0000020000000000000000000000007f00000100000000000000000000000000000000000000007f0000010000000000000000000000007f000001000000000000000000000000000000000000000002002020000000000000000000000000010000000000000002000000"], 0x94}}, 0x0) [ 90.616994][ T5285] Bluetooth: hci0: command tx timeout [ 90.930607][ T5323] [ 90.932354][ T5323] ============================= [ 90.934819][ T5323] WARNING: suspicious RCU usage [ 90.936966][ T5323] syzkaller #0 Not tainted [ 90.939719][ T5323] ----------------------------- [ 90.942401][ T5323] net/xfrm/xfrm_user.c:1630 suspicious rcu_dereference_check() usage! [ 90.946990][ T5323] [ 90.946990][ T5323] other info that might help us debug this: [ 90.946990][ T5323] [ 90.951416][ T5323] [ 90.951416][ T5323] rcu_scheduler_active = 2, debug_locks = 1 [ 90.954623][ T5323] 1 lock held by syz.0.0/5323: [ 90.956774][ T5323] #0: ffff8880336c9c50 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: xfrm_netlink_rcv+0x6a/0x90 [ 90.961460][ T5323] [ 90.961460][ T5323] stack backtrace: [ 90.964366][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 90.964385][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 90.964394][ T5323] Call Trace: [ 90.964403][ T5323] [ 90.964410][ T5323] dump_stack_lvl+0xe8/0x150 [ 90.964434][ T5323] lockdep_rcu_suspicious+0x13f/0x1d0 [ 90.964455][ T5323] xfrm_nlmsg_multicast+0x1d8/0x1f0 [ 90.964479][ T5323] xfrm_send_migrate_state+0x870/0xae0 [ 90.964505][ T5323] ? __pfx_xfrm_send_migrate_state+0x10/0x10 [ 90.964525][ T5323] ? xfrm_state_migrate_install+0x192/0x630 [ 90.964545][ T5323] xfrm_do_migrate_state+0x1703/0x1e50 [ 90.964563][ T5323] ? __pfx_xfrm_do_migrate_state+0x10/0x10 [ 90.964576][ T5323] ? rcu_is_watching+0x15/0xb0 [ 90.964595][ T5323] ? apparmor_capable+0x126/0x170 [ 90.964670][ T5323] ? __nla_parse+0x40/0x60 [ 90.964687][ T5323] xfrm_user_rcv_msg+0x7a8/0xf30 [ 90.964703][ T5323] ? __pfx_xfrm_user_rcv_msg+0x10/0x10 [ 90.964740][ T5323] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 90.964760][ T5323] ? lockdep_hardirqs_on+0x7a/0x110 [ 90.964776][ T5323] netlink_rcv_skb+0x226/0x4a0 [ 90.964789][ T5323] ? __mutex_lock+0x5d4/0x1550 [ 90.964801][ T5323] ? __pfx_xfrm_user_rcv_msg+0x10/0x10 [ 90.964813][ T5323] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 90.964836][ T5323] ? netlink_deliver_tap+0x2e/0x1b0 [ 90.964849][ T5323] ? netlink_deliver_tap+0x2e/0x1b0 [ 90.964864][ T5323] xfrm_netlink_rcv+0x79/0x90 [ 90.964876][ T5323] netlink_unicast+0x7bb/0x940 [ 90.964902][ T5323] netlink_sendmsg+0x813/0xb40 [ 90.964920][ T5323] ? __pfx_netlink_sendmsg+0x10/0x10 [ 90.964931][ T5323] ? kasan_save_free_info+0x40/0x50 [ 90.964944][ T5323] ? aa_sock_msg_perm+0xf1/0x1b0 [ 90.964964][ T5323] ? __pfx_netlink_sendmsg+0x10/0x10 [ 90.964976][ T5323] sock_sendmsg_nosec+0x13a/0x180 [ 90.964995][ T5323] ____sys_sendmsg+0x54e/0x850 [ 90.965010][ T5323] ? __pfx_____sys_sendmsg+0x10/0x10 [ 90.965031][ T5323] ? import_iovec+0x73/0xa0 [ 90.965051][ T5323] ___sys_sendmsg+0x2a5/0x360 [ 90.965062][ T5323] ? __lock_acquire+0x683/0x2cf0 [ 90.965080][ T5323] ? __pfx____sys_sendmsg+0x10/0x10 [ 90.965100][ T5323] ? tomoyo_path_number_perm+0x219/0x5f0 [ 90.965136][ T5323] ? __fget_files+0x2a/0x420 [ 90.965149][ T5323] ? __fget_files+0x3a2/0x420 [ 90.965167][ T5323] __x64_sys_sendmsg+0x1b1/0x290 [ 90.965180][ T5323] ? __pfx___x64_sys_sendmsg+0x10/0x10 [ 90.965189][ T5323] ? kfree+0x4d/0x640 [ 90.965203][ T5323] ? __pfx_kcov_ioctl+0x10/0x10 [ 90.965220][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 90.965232][ T5323] do_syscall_64+0x174/0x580 [ 90.965247][ T5323] ? trace_irq_disable+0x3b/0x140 [ 90.965265][ T5323] ? clear_bhb_loop+0x40/0x90 [ 90.965278][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 90.965288][ T5323] RIP: 0033:0x7f002319de99 [ 90.965300][ T5323] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 90.965310][ T5323] RSP: 002b:00007f00240ecfe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 90.965323][ T5323] RAX: ffffffffffffffda RBX: 00007f0023426090 RCX: 00007f002319de99 [ 90.965332][ T5323] RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000003 [ 90.965339][ T5323] RBP: 00007f0023233eaf R08: 0000000000000000 R09: 0000000000000000 [ 90.965347][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 90.965354][ T5323] R13: 00007f0023426128 R14: 00007f0023426090 R15: 00007ffd708d8728 [ 90.965372][ T5323]