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) (fail_nth: 8) [ 101.992637][ T5332] netlink: 'syz.0.0': attribute type 2 has an invalid length. [ 102.006292][ T5291] Bluetooth: hci0: command tx timeout [ 102.033532][ C0] [ 102.034672][ C0] ================================ [ 102.036966][ C0] WARNING: inconsistent lock state [ 102.039212][ C0] syzkaller #0 Not tainted [ 102.041071][ C0] -------------------------------- [ 102.043289][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 102.045890][ C0] syz.0.0/5330 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 102.048183][ C0] ffff8880414fbc68 (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1bf/0x9e0 [ 102.052215][ C0] {SOFTIRQ-ON-W} state was registered at: [ 102.054718][ C0] lock_acquire+0x106/0x350 [ 102.056740][ C0] _raw_spin_lock_nested+0x32/0x50 [ 102.059058][ C0] __sk_receive_skb+0x1bf/0x9e0 [ 102.061277][ C0] pep_do_rcv+0x685/0xaa0 [ 102.063288][ C0] __release_sock+0x297/0x3a0 [ 102.065208][ C0] release_sock+0x190/0x260 [ 102.066894][ C0] pep_sock_accept+0xdf5/0x12b0 [ 102.068845][ C0] pn_socket_accept+0xc9/0x2e0 [ 102.071003][ C0] do_accept+0x521/0x760 [ 102.072874][ C0] __sys_accept4+0x139/0x230 [ 102.074671][ C0] __x64_sys_accept+0x7d/0x90 [ 102.076685][ C0] do_syscall_64+0x15f/0xf80 [ 102.078623][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.081254][ C0] irq event stamp: 2140 [ 102.083061][ C0] hardirqs last enabled at (2140): [] _raw_spin_unlock_irq+0x23/0x50 [ 102.087296][ C0] hardirqs last disabled at (2139): [] _raw_spin_lock_irq+0x17/0x50 [ 102.091391][ C0] softirqs last enabled at (2134): [] netif_rx+0x79/0x90 [ 102.095067][ C0] softirqs last disabled at (2135): [] do_softirq+0x76/0xd0 [ 102.098848][ C0] [ 102.098848][ C0] other info that might help us debug this: [ 102.102343][ C0] Possible unsafe locking scenario: [ 102.102343][ C0] [ 102.105254][ C0] CPU0 [ 102.106678][ C0] ---- [ 102.108129][ C0] lock(slock-AF_PHONET/1); [ 102.110220][ C0] [ 102.111897][ C0] lock(slock-AF_PHONET/1); [ 102.113652][ C0] [ 102.113652][ C0] *** DEADLOCK *** [ 102.113652][ C0] [ 102.116737][ C0] 5 locks held by syz.0.0/5330: [ 102.118493][ C0] #0: ffff888046e0e040 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 [ 102.122238][ C0] #1: ffff8880414fc360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x86/0x5b0 [ 102.126130][ C0] #2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 [ 102.130036][ C0] #3: ffff8880414fc968 (slock-AF_PHONET){+.-.}-{3:3}, at: __sk_receive_skb+0x1f1/0x9e0 [ 102.134182][ C0] #4: ffff8880414fc9e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x781/0xc40 [ 102.138118][ C0] [ 102.138118][ C0] stack backtrace: [ 102.140508][ C0] CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 102.140518][ C0] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 102.140522][ C0] Call Trace: [ 102.140528][ C0] [ 102.140533][ C0] dump_stack_lvl+0xe8/0x150 [ 102.140548][ C0] print_usage_bug+0x28b/0x2e0 [ 102.140561][ C0] mark_lock_irq+0x410/0x420 [ 102.140569][ C0] ? kernel_text_address+0xa5/0xe0 [ 102.140580][ C0] mark_lock+0x115/0x190 [ 102.140587][ C0] __lock_acquire+0x689/0x2cf0 [ 102.140595][ C0] ? sk_filter_trim_cap+0x1a7/0xe70 [ 102.140606][ C0] ? sk_filter_trim_cap+0x91e/0xe70 [ 102.140619][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 102.140626][ C0] lock_acquire+0x106/0x350 [ 102.140632][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 102.140640][ C0] _raw_spin_lock_nested+0x32/0x50 [ 102.140649][ C0] ? __sk_receive_skb+0x1bf/0x9e0 [ 102.140656][ C0] __sk_receive_skb+0x1bf/0x9e0 [ 102.140663][ C0] pep_do_rcv+0x685/0xaa0 [ 102.140672][ C0] ? __pfx_pep_do_rcv+0x10/0x10 [ 102.140681][ C0] ? __pfx_pep_do_rcv+0x10/0x10 [ 102.140689][ C0] ? phonet_rcv+0x781/0xc40 [ 102.140696][ C0] __sk_receive_skb+0x962/0x9e0 [ 102.140703][ C0] phonet_rcv+0x781/0xc40 [ 102.140711][ C0] ? blk_queue_exit+0x26/0x240 [ 102.140757][ C0] ? __pfx_phonet_rcv+0x10/0x10 [ 102.140765][ C0] ? process_backlog+0x3eb/0x1950 [ 102.140772][ C0] ? process_backlog+0x3eb/0x1950 [ 102.140783][ C0] ? __pfx_phonet_rcv+0x10/0x10 [ 102.140790][ C0] ? process_backlog+0x3eb/0x1950 [ 102.140796][ C0] process_backlog+0xc66/0x1950 [ 102.140806][ C0] __napi_poll+0xae/0x340 [ 102.140811][ C0] ? skb_defer_free_flush+0x233/0x260 [ 102.140818][ C0] net_rx_action+0x627/0xf70 [ 102.140824][ C0] ? lock_acquire+0x106/0x350 [ 102.140832][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 102.140842][ C0] handle_softirqs+0x22a/0x840 [ 102.140850][ C0] ? do_softirq+0x76/0xd0 [ 102.140856][ C0] ? netif_rx+0x79/0x90 [ 102.140866][ C0] do_softirq+0x76/0xd0 [ 102.140872][ C0] [ 102.140874][ C0] [ 102.140881][ C0] __local_bh_enable_ip+0xf8/0x130 [ 102.140888][ C0] netif_rx+0x83/0x90 [ 102.140899][ C0] pn_send+0x62a/0x8e0 [ 102.140908][ C0] pn_skb_send+0x218/0x510 [ 102.140916][ C0] pep_sock_close+0x2c1/0x5b0 [ 102.140924][ C0] pn_socket_release+0x9b/0xc0 [ 102.140932][ C0] sock_close+0xc3/0x240 [ 102.140941][ C0] ? __pfx_sock_close+0x10/0x10 [ 102.140954][ C0] __fput+0x44f/0xa60 [ 102.140965][ C0] task_work_run+0x1d9/0x270 [ 102.140978][ C0] ? __pfx_task_work_run+0x10/0x10 [ 102.140996][ C0] exit_to_user_mode_loop+0xf3/0x4d0 [ 102.141003][ C0] ? rcu_is_watching+0x15/0xb0 [ 102.141014][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.141021][ C0] do_syscall_64+0x33e/0xf80 [ 102.141031][ C0] ? trace_irq_disable+0x3b/0x140 [ 102.141040][ C0] ? clear_bhb_loop+0x40/0x90 [ 102.141047][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.141054][ C0] RIP: 0033:0x7f547e39ce59 [ 102.141062][ 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 [ 102.141068][ C0] RSP: 002b:00007ffdc68248f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 102.141076][ C0] RAX: 0000000000000000 RBX: 00007ffdc68249e0 RCX: 00007f547e39ce59 [ 102.141080][ C0] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 102.141084][ C0] RBP: 0000000000018d8e R08: 0000000000000001 R09: 0000000000000000 [ 102.141088][ C0] R10: 00007f547e1ff02c R11: 0000000000000246 R12: 00007ffdc6824a20 [ 102.141092][ C0] R13: 00007f547e61609c R14: 0000000000018e08 R15: 00007f547e616090 [ 102.141098][ C0]