program: r0 = socket$inet6(0xa, 0x1, 0x100) r1 = socket$pppoe(0x18, 0x1, 0x0) getsockname(r1, 0x0, &(0x7f0000002800)) r2 = openat$tun(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0) ioctl$TUNSETIFF(r2, 0x400454ca, &(0x7f0000000040)={'syzkaller0\x00', 0x2}) r3 = openat$tun(0xffffffffffffff9c, &(0x7f0000000080), 0x100, 0x0) close(r3) recvfrom$inet6(r0, &(0x7f0000000140)=""/181, 0xb5, 0x0, &(0x7f0000000200)={0xa, 0x4e23, 0x0, @local, 0x2}, 0x1c) socket(0x400000000010, 0x3, 0x0) ioctl$SIOCSIFHWADDR(r3, 0x8922, &(0x7f0000002280)={'syzkaller0\x00', @random='\x00\t\x00'}) r4 = socket$netlink(0x10, 0x3, 0x14) sendmsg$RDMA_NLDEV_CMD_NEWLINK(r4, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000001200)={&(0x7f00000006c0)=ANY=[@ANYBLOB="380000000314010000000000000008000900020073797a310000000008004100736977001400330073797a6b616c6c657230"], 0x38}}, 0x0) syz_clone(0x42000000, 0x0, 0x0, 0x0, 0x0, 0x0) bind$inet6(r0, &(0x7f00000000c0)={0xa, 0x4e21, 0xb, @empty}, 0x1c) connect$inet6(r0, &(0x7f0000000000)={0xa, 0x4e21, 0x0, @empty}, 0x1c) [ 70.948105][ T49] Bluetooth: hci0: command tx timeout [ 71.038109][ T5327] iwpm_register_pid: Unable to send a nlmsg (client = 2) [ 71.045013][ T5327] infiniband syz1: RDMA CMA: cma_listen_on_dev, error -98 [ 71.149378][ T5327] [ 71.150400][ T5327] ====================================================== [ 71.153123][ T5327] WARNING: possible circular locking dependency detected [ 71.155780][ T5327] 6.14.0-syzkaller-10167-g93d52288679e #0 Not tainted [ 71.158367][ T5327] ------------------------------------------------------ [ 71.161092][ T5327] syz.0.0/5327 is trying to acquire lock: [ 71.163310][ T5327] ffffffff900f2fc8 (rtnl_mutex){+.+.}-{4:4}, at: smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.166985][ T5327] [ 71.166985][ T5327] but task is already holding lock: [ 71.169802][ T5327] ffff888043930258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: smc_connect+0xb7/0xde0 [ 71.173264][ T5327] [ 71.173264][ T5327] which lock already depends on the new lock. [ 71.173264][ T5327] [ 71.177258][ T5327] [ 71.177258][ T5327] the existing dependency chain (in reverse order) is: [ 71.180647][ T5327] [ 71.180647][ T5327] -> #2 (sk_lock-AF_INET6){+.+.}-{0:0}: [ 71.183682][ T5327] lock_acquire+0x116/0x2f0 [ 71.185726][ T5327] lock_sock_nested+0x48/0x100 [ 71.187750][ T5327] sock_set_reuseaddr+0x17/0x60 [ 71.189887][ T5327] siw_create_listen+0x19f/0x1250 [ 71.192059][ T5327] iw_cm_listen+0x15e/0x230 [ 71.194079][ T5327] rdma_listen+0xb51/0xe40 [ 71.196032][ T5327] cma_listen_on_dev+0x3e0/0x6f0 [ 71.198179][ T5327] cma_add_one+0x7dc/0xce0 [ 71.200175][ T5327] add_client_context+0x53e/0x8b0 [ 71.202416][ T5327] enable_device_and_get+0x1de/0x450 [ 71.204795][ T5327] ib_register_device+0x1138/0x1460 [ 71.207080][ T5327] siw_newlink+0x938/0xda0 [ 71.209069][ T5327] nldev_newlink+0x5ed/0x680 [ 71.211057][ T5327] rdma_nl_rcv+0x6e5/0x9e0 [ 71.212951][ T5327] netlink_unicast+0x7f8/0x9a0 [ 71.215037][ T5327] netlink_sendmsg+0x8c3/0xcd0 [ 71.216889][ T5327] __sock_sendmsg+0x221/0x270 [ 71.218837][ T5327] ____sys_sendmsg+0x523/0x860 [ 71.220584][ T5327] __sys_sendmsg+0x271/0x360 [ 71.222457][ T5327] do_syscall_64+0xf3/0x230 [ 71.224204][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.226510][ T5327] [ 71.226510][ T5327] -> #1 (lock#8){+.+.}-{4:4}: [ 71.229062][ T5327] lock_acquire+0x116/0x2f0 [ 71.231154][ T5327] __mutex_lock+0x1a5/0x10c0 [ 71.233647][ T5327] cma_init+0x1e/0x140 [ 71.235513][ T5327] do_one_initcall+0x24a/0x940 [ 71.237564][ T5327] do_initcall_level+0x157/0x210 [ 71.239730][ T5327] do_initcalls+0x71/0xd0 [ 71.241660][ T5327] kernel_init_freeable+0x432/0x5d0 [ 71.243878][ T5327] kernel_init+0x1d/0x2b0 [ 71.245754][ T5327] ret_from_fork+0x4b/0x80 [ 71.247686][ T5327] ret_from_fork_asm+0x1a/0x30 [ 71.249752][ T5327] [ 71.249752][ T5327] -> #0 (rtnl_mutex){+.+.}-{4:4}: [ 71.252444][ T5327] validate_chain+0xa69/0x24e0 [ 71.254555][ T5327] __lock_acquire+0xad5/0xd80 [ 71.256572][ T5327] lock_acquire+0x116/0x2f0 [ 71.258644][ T5327] __mutex_lock+0x1a5/0x10c0 [ 71.260643][ T5327] smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.262746][ T5327] __smc_connect+0x296/0x1920 [ 71.264675][ T5327] smc_connect+0x868/0xde0 [ 71.266591][ T5327] __sys_connect+0x28c/0x2d0 [ 71.268495][ T5327] __x64_sys_connect+0x7a/0x90 [ 71.270515][ T5327] do_syscall_64+0xf3/0x230 [ 71.272475][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.274992][ T5327] [ 71.274992][ T5327] other info that might help us debug this: [ 71.274992][ T5327] [ 71.278853][ T5327] Chain exists of: [ 71.278853][ T5327] rtnl_mutex --> lock#8 --> sk_lock-AF_INET6 [ 71.278853][ T5327] [ 71.283283][ T5327] Possible unsafe locking scenario: [ 71.283283][ T5327] [ 71.286209][ T5327] CPU0 CPU1 [ 71.288205][ T5327] ---- ---- [ 71.290390][ T5327] lock(sk_lock-AF_INET6); [ 71.292151][ T5327] lock(lock#8); [ 71.294547][ T5327] lock(sk_lock-AF_INET6); [ 71.297234][ T5327] lock(rtnl_mutex); [ 71.298801][ T5327] [ 71.298801][ T5327] *** DEADLOCK *** [ 71.298801][ T5327] [ 71.302188][ T5327] 1 lock held by syz.0.0/5327: [ 71.304100][ T5327] #0: ffff888043930258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: smc_connect+0xb7/0xde0 [ 71.307641][ T5327] [ 71.307641][ T5327] stack backtrace: [ 71.309855][ T5327] CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-10167-g93d52288679e #0 PREEMPT(full) [ 71.309874][ T5327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 71.309881][ T5327] Call Trace: [ 71.309888][ T5327] [ 71.309893][ T5327] dump_stack_lvl+0x241/0x360 [ 71.309914][ T5327] ? __pfx_dump_stack_lvl+0x10/0x10 [ 71.309929][ T5327] ? __pfx__printk+0x10/0x10 [ 71.309942][ T5327] ? print_lock+0x171/0x1a0 [ 71.309955][ T5327] print_circular_bug+0x2e1/0x300 [ 71.309967][ T5327] check_noncircular+0x142/0x160 [ 71.309981][ T5327] validate_chain+0xa69/0x24e0 [ 71.309998][ T5327] __lock_acquire+0xad5/0xd80 [ 71.310009][ T5327] lock_acquire+0x116/0x2f0 [ 71.310019][ T5327] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.310035][ T5327] ? kasan_save_track+0x51/0x80 [ 71.310092][ T5327] __mutex_lock+0x1a5/0x10c0 [ 71.310108][ T5327] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.310126][ T5327] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.310139][ T5327] ? __pfx___mutex_lock+0x10/0x10 [ 71.310155][ T5327] smc_vlan_by_tcpsk+0x39b/0x4f0 [ 71.310171][ T5327] ? __pfx_smc_vlan_by_tcpsk+0x10/0x10 [ 71.310185][ T5327] ? __kmalloc_cache_noprof+0x236/0x370 [ 71.310195][ T5327] ? __smc_connect+0x1c7/0x1920 [ 71.310207][ T5327] __smc_connect+0x296/0x1920 [ 71.310219][ T5327] ? do_raw_spin_unlock+0x58/0x8b0 [ 71.310234][ T5327] smc_connect+0x868/0xde0 [ 71.310246][ T5327] __sys_connect+0x28c/0x2d0 [ 71.310259][ T5327] ? __pfx___sys_connect+0x10/0x10 [ 71.310274][ T5327] __x64_sys_connect+0x7a/0x90 [ 71.310285][ T5327] do_syscall_64+0xf3/0x230 [ 71.310301][ T5327] ? clear_bhb_loop+0x45/0xa0 [ 71.310310][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.310317][ T5327] RIP: 0033:0x7f2d36d8d169 [ 71.310326][ T5327] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 [ 71.310340][ T5327] RSP: 002b:00007f2d37c5d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 71.310353][ T5327] RAX: ffffffffffffffda RBX: 00007f2d36fa5fa0 RCX: 00007f2d36d8d169 [ 71.310361][ T5327] RDX: 000000000000001c RSI: 0000200000000000 RDI: 0000000000000003 [ 71.310369][ T5327] RBP: 00007f2d36e0e2a0 R08: 0000000000000000 R09: 0000000000000000 [ 71.310376][ T5327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 71.310384][ T5327] R13: 0000000000000000 R14: 00007f2d36fa5fa0 R15: 00007fff929e12b8 [ 71.310395][ T5327]