program: r0 = socket$kcm(0x23, 0x5, 0x0) listen(r0, 0x800) accept(r0, 0x0, 0x0) r1 = socket$kcm(0x10, 0x2, 0x0) sendmsg$inet(r1, &(0x7f0000000440)={0x0, 0x0, &(0x7f0000000f00)=[{&(0x7f0000000200)="5c00000014006b05c84e21000ab16d6e230675f811000000440002005817d30461bc24eeb556a7ef595105ea1698fa51f60a64c9f408000000e786a6d0bdbdc3d44bd70011b6c0504bb9189d9193e9bd00"/92, 0x5c}], 0x1, 0x0, 0x0, 0x1f00c00e}, 0x240040c4) r2 = socket$phonet_pipe(0x23, 0x5, 0x2) connect$phonet_pipe(r2, &(0x7f0000000040)={0x23, 0x0, 0x58}, 0x10) [ 91.889542][ T5286] Bluetooth: hci0: command tx timeout [ 92.105571][ T5324] netlink: 'syz.0.0': attribute type 2 has an invalid length. [ 92.173710][ C0] [ 92.174898][ C0] ================================ [ 92.177124][ C0] WARNING: inconsistent lock state [ 92.179199][ C0] syzkaller #0 Not tainted [ 92.181150][ C0] -------------------------------- [ 92.183419][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 92.186357][ C0] syz.0.0/5322 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 92.188960][ C0] ffff88803f623c68 (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1bf/0x9e0 [ 92.193096][ C0] {SOFTIRQ-ON-W} state was registered at: [ 92.195686][ C0] lock_acquire+0x106/0x350 [ 92.197675][ C0] _raw_spin_lock_nested+0x32/0x50 [ 92.200061][ C0] __sk_receive_skb+0x1bf/0x9e0 [ 92.202265][ C0] pep_do_rcv+0x685/0xaa0 [ 92.204232][ C0] __release_sock+0x297/0x3a0 [ 92.206092][ C0] release_sock+0x190/0x260 [ 92.208032][ C0] pep_sock_accept+0xdf5/0x12b0 [ 92.210138][ C0] pn_socket_accept+0xc9/0x2e0 [ 92.212221][ C0] do_accept+0x521/0x760 [ 92.214061][ C0] __sys_accept4+0x139/0x230 [ 92.216100][ C0] __x64_sys_accept+0x7d/0x90 [ 92.218161][ C0] do_syscall_64+0x15f/0xf80 [ 92.220141][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 92.222651][ C0] irq event stamp: 3342 [ 92.224522][ C0] hardirqs last enabled at (3342): [] _raw_spin_unlock_irq+0x23/0x50 [ 92.228584][ C0] hardirqs last disabled at (3341): [] _raw_spin_lock_irq+0x17/0x50 [ 92.232708][ C0] softirqs last enabled at (3336): [] netif_rx+0x79/0x90 [ 92.236336][ C0] softirqs last disabled at (3337): [] do_softirq+0x76/0xd0 [ 92.239859][ C0] [ 92.239859][ C0] other info that might help us debug this: [ 92.243185][ C0] Possible unsafe locking scenario: [ 92.243185][ C0] [ 92.246407][ C0] CPU0 [ 92.247909][ C0] ---- [ 92.249384][ C0] lock(slock-AF_PHONET/1); [ 92.251435][ C0] [ 92.252954][ C0] lock(slock-AF_PHONET/1); [ 92.255250][ C0] [ 92.255250][ C0] *** DEADLOCK *** [ 92.255250][ C0] [ 92.258739][ C0] 5 locks held by syz.0.0/5322: [ 92.260894][ C0] #0: ffff888046e3e640 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 [ 92.265489][ C0] #1: ffff88803f624360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x86/0x5b0 [ 92.269595][ C0] #2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 [ 92.274411][ C0] #3: ffff88803f624968 (slock-AF_PHONET){+.-.}-{3:3}, at: __sk_receive_skb+0x1f1/0x9e0 [ 92.278558][ C0] #4: ffff88803f6249e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x781/0xc40 [ 92.282674][ C0] [ 92.282674][ C0] stack backtrace: [ 92.285446][ C0] CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 92.285464][ C0] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 92.285470][ C0] Call Trace: [ 92.285478][ C0] [ 92.285484][ C0] dump_stack_lvl+0xe8/0x150 [ 92.285502][ C0] print_usage_bug+0x28b/0x2e0 [ 92.285517][ C0] mark_lock_irq+0x410/0x420 [ 92.285530][ C0] ? __udp4_lib_lookup+0x769/0xdf0 [ 92.285541][ C0] mark_lock+0x115/0x190 [ 92.285552][ C0] __lock_acquire+0x689/0x2cf0 [ 92.285564][ C0] ? sk_filter_trim_cap+0x1a7/0xe70 [ 92.285580][ C0] ? sk_filter_trim_cap+0x91e/0xe70 [ 92.285593][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 92.285603][ C0] lock_acquire+0x106/0x350 [ 92.285613][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 92.285625][ C0] _raw_spin_lock_nested+0x32/0x50 [ 92.285639][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 92.285649][ C0] __sk_receive_skb+0x1bf/0x9e0 [ 92.285670][ C0] pep_do_rcv+0x685/0xaa0 [ 92.285685][ C0] ? __pfx_pep_do_rcv+0x10/0x10 [ 92.285700][ C0] ? __pfx_pep_do_rcv+0x10/0x10 [ 92.285713][ C0] ? phonet_rcv+0x781/0xc40 [ 92.285724][ C0] __sk_receive_skb+0x962/0x9e0 [ 92.285735][ C0] phonet_rcv+0x781/0xc40 [ 92.285746][ C0] ? sock_wfree+0x28e/0x750 [ 92.285760][ C0] ? __pfx_phonet_rcv+0x10/0x10 [ 92.285773][ C0] ? process_backlog+0x3eb/0x1950 [ 92.285783][ C0] ? process_backlog+0x3eb/0x1950 [ 92.285792][ C0] ? __pfx_phonet_rcv+0x10/0x10 [ 92.285803][ C0] ? process_backlog+0x3eb/0x1950 [ 92.285813][ C0] process_backlog+0xc66/0x1950 [ 92.285859][ C0] __napi_poll+0xae/0x340 [ 92.285871][ C0] ? skb_defer_free_flush+0x233/0x260 [ 92.285882][ C0] net_rx_action+0x627/0xf70 [ 92.285892][ C0] ? lock_acquire+0x106/0x350 [ 92.285905][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 92.285920][ C0] handle_softirqs+0x22a/0x840 [ 92.285932][ C0] ? do_softirq+0x76/0xd0 [ 92.285943][ C0] ? netif_rx+0x79/0x90 [ 92.285956][ C0] do_softirq+0x76/0xd0 [ 92.285966][ C0] [ 92.285970][ C0] [ 92.285974][ C0] __local_bh_enable_ip+0xf8/0x130 [ 92.285984][ C0] netif_rx+0x83/0x90 [ 92.285996][ C0] pn_send+0x62a/0x8e0 [ 92.286009][ C0] pn_skb_send+0x218/0x510 [ 92.286021][ C0] pep_sock_close+0x2c1/0x5b0 [ 92.286034][ C0] pn_socket_release+0x9b/0xc0 [ 92.286046][ C0] sock_close+0xc3/0x240 [ 92.286061][ C0] ? __pfx_sock_close+0x10/0x10 [ 92.286075][ C0] __fput+0x44f/0xa60 [ 92.286089][ C0] task_work_run+0x1d9/0x270 [ 92.286103][ C0] ? __pfx_task_work_run+0x10/0x10 [ 92.286116][ C0] exit_to_user_mode_loop+0xf3/0x4d0 [ 92.286127][ C0] ? rcu_is_watching+0x15/0xb0 [ 92.286139][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 92.286150][ C0] do_syscall_64+0x33e/0xf80 [ 92.286165][ C0] ? trace_irq_disable+0x3b/0x140 [ 92.286180][ C0] ? clear_bhb_loop+0x40/0x90 [ 92.286191][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 92.286203][ C0] RIP: 0033:0x7feb4b59ce59 [ 92.286219][ C0] 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 [ 92.286228][ C0] RSP: 002b:00007ffe28931318 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 92.286241][ C0] RAX: 0000000000000000 RBX: 00007feb4b817da0 RCX: 00007feb4b59ce59 [ 92.286249][ C0] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 92.286255][ C0] RBP: 00007feb4b817da0 R08: 00007feb4b816038 R09: 0000000000000000 [ 92.286262][ C0] R10: 0000000000df52c4 R11: 0000000000000246 R12: 0000000000016a1e [ 92.286268][ C0] R13: 00007feb4b81609c R14: 000000000001678c R15: 00007feb4b816090 [ 92.286279][ C0]