program: r0 = socket$inet6_tcp(0xa, 0x1, 0x0) r1 = socket$nl_generic(0x10, 0x3, 0x10) r2 = socket$nl_generic(0x10, 0x3, 0x10) r3 = syz_genetlink_get_family_id$smc(&(0x7f00000033c0), r2) sendmsg$SMC_PNETID_ADD(r2, &(0x7f00000034c0)={0x0, 0x0, &(0x7f0000003480)={&(0x7f0000000000)={0x34, r3, 0x1, 0x70bd28, 0x25dfdbfe, {}, [@SMC_PNETID_NAME={0x9, 0x1, 'syz1\x00'}, @SMC_PNETID_ETHNAME={0x14, 0x2, 'bridge_slave_0\x00'}]}, 0x34}, 0x1, 0x0, 0x0, 0x850c081d989709a5}, 0x40000) r4 = bpf$BPF_PROG_RAW_TRACEPOINT_LOAD(0x5, &(0x7f0000002c80)={0x3, 0xc, &(0x7f0000000500)=ANY=[@ANYBLOB="1802000005000000000000000000000085000000870000001801000020786c2500000000002020207b1af8ff00000000bfa100000000000007010000f8ffffffb702000008000000b70300000000000085000000070000009500"], &(0x7f0000000080)='syzkaller\x00'}, 0x94) bpf$BPF_PROG_TEST_RUN(0xa, &(0x7f00000002c0)={r4, 0x2000, 0xe, 0x0, &(0x7f0000000100)="e0b9547ed387dbe9abc89b6f5bec", 0x0, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x50) sendmsg$SMC_PNETID_ADD(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000040)={0x34, r3, 0x1, 0x70bd2b, 0x25dfdbfd, {}, [@SMC_PNETID_NAME={0x9, 0x1, 'syz2\x00'}, @SMC_PNETID_ETHNAME={0x14, 0x2, 'ip6erspan0\x00'}]}, 0x34}}, 0x800) close(r0) setsockopt$SO_TIMESTAMP(r0, 0x1, 0x3f, &(0x7f0000000080)=0x2, 0x4) socket(0x2b, 0x1, 0x1) bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c) listen(r0, 0x0) r5 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r5, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10) [ 83.768224][ T44] Bluetooth: hci0: command tx timeout [ 83.860275][ T5333] smc: net device bridge_slave_0 applied user defined pnetid SYZ1 [ 84.046375][ T5332] [ 84.047489][ T5332] ====================================================== [ 84.050527][ T5332] WARNING: possible circular locking dependency detected [ 84.053529][ T5332] syzkaller #0 Not tainted [ 84.055495][ T5332] ------------------------------------------------------ [ 84.058510][ T5332] syz.0.0/5332 is trying to acquire lock: [ 84.060770][ T5332] ffff888040690a68 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 [ 84.065671][ T5332] [ 84.065671][ T5332] but task is already holding lock: [ 84.068700][ T5332] ffff888040690ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 [ 84.072366][ T5332] [ 84.072366][ T5332] which lock already depends on the new lock. [ 84.072366][ T5332] [ 84.076627][ T5332] [ 84.076627][ T5332] the existing dependency chain (in reverse order) is: [ 84.080362][ T5332] [ 84.080362][ T5332] -> #1 (sk_lock-AF_SMC/1){+.+.}-{0:0}: [ 84.083926][ T5332] lock_sock_nested+0x41/0x100 [ 84.085985][ T5332] smc_listen_out+0x109/0x3e0 [ 84.088450][ T5332] smc_listen_work+0x813/0x13f0 [ 84.091077][ T5332] process_scheduled_works+0xb5d/0x1860 [ 84.093698][ T5332] worker_thread+0xa53/0xfc0 [ 84.095801][ T5332] kthread+0x389/0x470 [ 84.097634][ T5332] ret_from_fork+0x514/0xb70 [ 84.099667][ T5332] ret_from_fork_asm+0x1a/0x30 [ 84.101567][ T5332] [ 84.101567][ T5332] -> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}: [ 84.105642][ T5332] __lock_acquire+0x15a5/0x2cf0 [ 84.107908][ T5332] lock_acquire+0x106/0x350 [ 84.110062][ T5332] __flush_work+0x700/0xc50 [ 84.112216][ T5332] __cancel_work_sync+0xbe/0x110 [ 84.114601][ T5332] smc_clcsock_release+0x60/0xf0 [ 84.117071][ T5332] __smc_release+0x66b/0x7e0 [ 84.119254][ T5332] smc_close_non_accepted+0xd5/0x1f0 [ 84.121723][ T5332] smc_close_active+0xb67/0xf10 [ 84.124021][ T5332] __smc_release+0x8d/0x7e0 [ 84.126221][ T5332] smc_release+0x2ce/0x560 [ 84.128301][ T5332] sock_close+0xc3/0x240 [ 84.130542][ T5332] __fput+0x44f/0xa60 [ 84.132537][ T5332] task_work_run+0x1d9/0x270 [ 84.134935][ T5332] exit_to_user_mode_loop+0x193/0x680 [ 84.137444][ T5332] do_syscall_64+0x353/0x580 [ 84.139463][ T5332] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.142060][ T5332] [ 84.142060][ T5332] other info that might help us debug this: [ 84.142060][ T5332] [ 84.146316][ T5332] Possible unsafe locking scenario: [ 84.146316][ T5332] [ 84.149226][ T5332] CPU0 CPU1 [ 84.151115][ T5332] ---- ---- [ 84.153316][ T5332] lock(sk_lock-AF_SMC/1); [ 84.155280][ T5332] lock((work_completion)(&new_smc->smc_listen_work)); [ 84.159225][ T5332] lock(sk_lock-AF_SMC/1); [ 84.162162][ T5332] lock((work_completion)(&new_smc->smc_listen_work)); [ 84.165274][ T5332] [ 84.165274][ T5332] *** DEADLOCK *** [ 84.165274][ T5332] [ 84.168759][ T5332] 3 locks held by syz.0.0/5332: [ 84.170924][ T5332] #0: ffff88804715bbc0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 [ 84.175234][ T5332] #1: ffff888040690ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 [ 84.179979][ T5332] #2: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 [ 84.185308][ T5332] [ 84.185308][ T5332] stack backtrace: [ 84.188219][ T5332] CPU: 0 UID: 0 PID: 5332 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 84.188236][ T5332] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 84.188243][ T5332] Call Trace: [ 84.188250][ T5332] [ 84.188256][ T5332] dump_stack_lvl+0xe8/0x150 [ 84.188274][ T5332] print_circular_bug+0x2e1/0x300 [ 84.188290][ T5332] check_noncircular+0x12e/0x150 [ 84.188303][ T5332] __lock_acquire+0x15a5/0x2cf0 [ 84.188317][ T5332] ? __pfx___schedule+0x10/0x10 [ 84.188330][ T5332] ? irqentry_exit+0x218/0x8b0 [ 84.188340][ T5332] ? irqentry_exit+0x218/0x8b0 [ 84.188348][ T5332] ? trace_irq_disable+0x3b/0x140 [ 84.188364][ T5332] ? __flush_work+0x100/0xc50 [ 84.188375][ T5332] lock_acquire+0x106/0x350 [ 84.188384][ T5332] ? __flush_work+0x100/0xc50 [ 84.188396][ T5332] ? preempt_schedule_thunk+0x16/0x30 [ 84.188411][ T5332] ? __flush_work+0x100/0xc50 [ 84.188421][ T5332] __flush_work+0x700/0xc50 [ 84.188432][ T5332] ? __flush_work+0x100/0xc50 [ 84.188443][ T5332] ? __flush_work+0x100/0xc50 [ 84.188454][ T5332] ? __pfx___flush_work+0x10/0x10 [ 84.188466][ T5332] ? __pfx_wq_barrier_func+0x10/0x10 [ 84.188480][ T5332] ? __cancel_work_sync+0x5c/0x110 [ 84.188492][ T5332] __cancel_work_sync+0xbe/0x110 [ 84.188504][ T5332] smc_clcsock_release+0x60/0xf0 [ 84.188516][ T5332] __smc_release+0x66b/0x7e0 [ 84.188530][ T5332] ? __local_bh_enable_ip+0xd0/0x130 [ 84.188541][ T5332] smc_close_non_accepted+0xd5/0x1f0 [ 84.188556][ T5332] smc_close_active+0xb67/0xf10 [ 84.188567][ T5332] ? __pfx_sock_def_readable+0x10/0x10 [ 84.188578][ T5332] __smc_release+0x8d/0x7e0 [ 84.188591][ T5332] ? __local_bh_enable_ip+0xd0/0x130 [ 84.188602][ T5332] smc_release+0x2ce/0x560 [ 84.188615][ T5332] sock_close+0xc3/0x240 [ 84.188625][ T5332] ? __pfx_sock_close+0x10/0x10 [ 84.188635][ T5332] __fput+0x44f/0xa60 [ 84.188648][ T5332] task_work_run+0x1d9/0x270 [ 84.188662][ T5332] ? __pfx_task_work_run+0x10/0x10 [ 84.188678][ T5332] exit_to_user_mode_loop+0x193/0x680 [ 84.188689][ T5332] ? rcu_is_watching+0x15/0xb0 [ 84.188701][ T5332] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.188712][ T5332] do_syscall_64+0x353/0x580 [ 84.188722][ T5332] ? clear_bhb_loop+0x40/0x90 [ 84.188733][ T5332] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.188743][ T5332] RIP: 0033:0x7fa78379ce59 [ 84.188754][ T5332] 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 [ 84.188762][ T5332] RSP: 002b:00007ffea62c1218 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 84.188774][ T5332] RAX: 0000000000000000 RBX: 00007fa783a17da0 RCX: 00007fa78379ce59 [ 84.188781][ T5332] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 84.188787][ T5332] RBP: 00007fa783a17da0 R08: 00007fa783a16038 R09: 0000000000000000 [ 84.188793][ T5332] R10: 0000000000deecf8 R11: 0000000000000246 R12: 0000000000014a24 [ 84.188799][ T5332] R13: 00007fa783a15fac R14: 0000000000014786 R15: 00007ffea62c1320 [ 84.188809][ T5332]