program: sendmsg$IPSET_CMD_CREATE(0xffffffffffffffff, &(0x7f0000000040)={0x0, 0x0, &(0x7f00000044c0)={&(0x7f00000001c0)={0x28, 0x2, 0x6, 0x3, 0x0, 0x0, {0x7}, [@IPSET_ATTR_PROTOCOL={0x5, 0x1, 0x6}, @IPSET_ATTR_SETNAME={0x9, 0x2, 'syz1\x00'}]}, 0x28}, 0x1, 0x0, 0x0, 0x810}, 0x20004000) r0 = socket$nl_xfrm(0x10, 0x3, 0x6) sendmsg$nl_xfrm(r0, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000380)={&(0x7f0000000000)=ANY=[@ANYBLOB="500100001000010000000000000000007f0000010000edffffff0000000000007f00000100000000000000000000000000000000000000000200202000000000", @ANYRES32=0x0, @ANYRES32=0x0, @ANYBLOB="7f00000100000000000000000000000000be3412320000007f000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000002000000000000000000000060001200726663343130362867636d2861657329290000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000060"], 0x150}}, 0x0) sendmsg$nl_xfrm(r0, &(0x7f0000000500)={0x0, 0x0, &(0x7f0000000400)={&(0x7f0000000000)=ANY=[@ANYBLOB="940000002900010000000000000000007f00000100000000000000000000000000be3412020032007f0000020000000000000000000000007f00000100000000000000000000000000000000000000007f0000010000000000000000000000007f000001000000000000000000000000000000000000000002002020000000000000000000000000010000000000000002"], 0x94}}, 0x0) r1 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r1, 0x0, 0x0) [ 114.855183][ T4648] Bluetooth: hci0: command tx timeout [ 115.033157][ T5330] [ 115.034666][ T5330] ============================= [ 115.037323][ T5330] WARNING: suspicious RCU usage [ 115.039996][ T5330] syzkaller #0 Not tainted [ 115.041914][ T5330] ----------------------------- [ 115.044007][ T5330] net/xfrm/xfrm_user.c:1630 suspicious rcu_dereference_check() usage! [ 115.047828][ T5330] [ 115.047828][ T5330] other info that might help us debug this: [ 115.047828][ T5330] [ 115.052214][ T5330] [ 115.052214][ T5330] rcu_scheduler_active = 2, debug_locks = 1 [ 115.056130][ T5330] locks held by syz.0.0/5330: 1, last CPU#0: [ 115.059302][ T5330] #0: ffff888012f79cd0 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: xfrm_netlink_rcv+0x6a/0x90 [ 115.064439][ T5330] [ 115.064439][ T5330] stack backtrace: [ 115.067378][ T5330] CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 115.071302][ T5330] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 115.075590][ T5330] Call Trace: [ 115.077068][ T5330] [ 115.078406][ T5330] dump_stack_lvl+0xe8/0x150 [ 115.080607][ T5330] lockdep_rcu_suspicious+0x140/0x1d0 [ 115.083082][ T5330] xfrm_nlmsg_multicast+0x1d8/0x1f0 [ 115.085541][ T5330] xfrm_send_migrate_state+0x870/0xae0 [ 115.087968][ T5330] ? __pfx_xfrm_send_migrate_state+0x10/0x10 [ 115.090626][ T5330] ? xfrm_state_migrate_install+0x192/0x630 [ 115.093208][ T5330] xfrm_do_migrate_state+0x1703/0x1e50 [ 115.095641][ T5330] ? __pfx_xfrm_do_migrate_state+0x10/0x10 [ 115.098288][ T5330] ? rcu_is_watching+0x16/0xb0 [ 115.100471][ T5330] ? apparmor_capable+0x126/0x170 [ 115.102863][ T5330] ? __nla_parse+0x40/0x60 [ 115.104873][ T5330] xfrm_user_rcv_msg+0x7a8/0xf30 [ 115.107014][ T5330] ? __pfx_xfrm_user_rcv_msg+0x10/0x10 [ 115.109437][ T5330] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 115.112041][ T5330] netlink_rcv_skb+0x226/0x4a0 [ 115.114161][ T5330] ? __mutex_lock+0x5d4/0x1550 [ 115.116427][ T5330] ? __pfx_xfrm_user_rcv_msg+0x10/0x10 [ 115.119050][ T5330] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 115.121429][ T5330] ? netlink_deliver_tap+0x2e/0x1b0 [ 115.123822][ T5330] ? netlink_deliver_tap+0x2e/0x1b0 [ 115.126077][ T5330] xfrm_netlink_rcv+0x79/0x90 [ 115.128248][ T5330] netlink_unicast+0x7bd/0x940 [ 115.130445][ T5330] netlink_sendmsg+0x813/0xb40 [ 115.132590][ T5330] ? __pfx_netlink_sendmsg+0x10/0x10 [ 115.134949][ T5330] ? apparmor_socket_sendmsg+0x98/0x360 [ 115.137232][ T5330] ? __pfx_netlink_sendmsg+0x10/0x10 [ 115.139534][ T5330] sock_sendmsg_nosec+0x13a/0x180 [ 115.141768][ T5330] ____sys_sendmsg+0x54e/0x850 [ 115.143871][ T5330] ? __pfx_____sys_sendmsg+0x10/0x10 [ 115.146120][ T5330] ? import_iovec+0x73/0xa0 [ 115.148027][ T5330] ___sys_sendmsg+0x2a5/0x360 [ 115.150063][ T5330] ? __lock_acquire+0x747/0x2de0 [ 115.152140][ T5330] ? __pfx____sys_sendmsg+0x10/0x10 [ 115.154408][ T5330] ? ktime_get+0x45/0x220 [ 115.156461][ T5330] ? kvm_clock_get_cycles+0x49/0x60 [ 115.158763][ T5330] ? __fget_files+0x2a/0x420 [ 115.160776][ T5330] ? __fget_files+0x3a2/0x420 [ 115.162852][ T5330] __x64_sys_sendmsg+0x1b1/0x290 [ 115.164967][ T5330] ? __pfx___x64_sys_sendmsg+0x10/0x10 [ 115.167284][ T5330] ? kfree+0x4d/0x650 [ 115.169060][ T5330] ? __pfx_kcov_ioctl+0x10/0x10 [ 115.171268][ T5330] do_syscall_64+0x166/0x520 [ 115.173260][ T5330] ? trace_irq_disable+0x3b/0x140 [ 115.175463][ T5330] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 115.178019][ T5330] ? clear_bhb_loop+0x70/0xc0 [ 115.180152][ T5330] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 115.182782][ T5330] RIP: 0033:0x7f366bb9e159 [ 115.184763][ T5330] 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 [ 115.192635][ T5330] RSP: 002b:00007f366cb0cfe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 115.196286][ T5330] RAX: ffffffffffffffda RBX: 00007f366be26090 RCX: 00007f366bb9e159 [ 115.199857][ T5330] RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000003 [ 115.203238][ T5330] RBP: 00007f366bc3503b R08: 0000000000000000 R09: 0000000000000000 [ 115.206561][ T5330] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 115.210016][ T5330] R13: 00007f366be26128 R14: 00007f366be26090 R15: 00007ffe9352a858 [ 115.213397][ T5330]