program: r0 = socket$nl_route(0x10, 0x3, 0x0) sendmsg$nl_route(r0, &(0x7f0000000900)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000540)=ANY=[@ANYBLOB="4c0000002000010000000000000000000a801400000000080c000000140001002001000000000000000000000000000114000200fc0200000000000000000000000000ff080018004e244e246ffec4d916392a7a6e2891e8abf79233117381b5776c9578aa91f225f6996e62f558043a171ee8f0f4c57f99f5f83a0728302f222775a7"], 0x4c}}, 0x40000) r1 = socket$inet6_tcp(0xa, 0x1, 0x0) r2 = socket$nl_generic(0x10, 0x3, 0x10) r3 = socket$nl_generic(0x10, 0x3, 0x10) r4 = syz_genetlink_get_family_id$smc(&(0x7f00000033c0), r3) sendmsg$SMC_PNETID_ADD(r3, &(0x7f00000034c0)={0x0, 0x0, &(0x7f0000003480)={&(0x7f0000000000)={0x34, r4, 0x1, 0x70bd28, 0x25dfdbfe, {}, [@SMC_PNETID_NAME={0x9, 0x1, 'syz1\x00'}, @SMC_PNETID_ETHNAME={0x14, 0x2, 'bridge_slave_0\x00'}]}, 0x34}, 0x1, 0x0, 0x0, 0x850c081d989709a5}, 0x40000) sendmsg$SMC_PNETID_ADD(r2, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000040)={0x34, r4, 0x1, 0x70bd2b, 0x25dfdbfd, {}, [@SMC_PNETID_NAME={0x9, 0x1, 'syz2\x00'}, @SMC_PNETID_ETHNAME={0x14, 0x2, 'ip6erspan0\x00'}]}, 0x34}}, 0x800) close(r1) socket(0x2b, 0x1, 0x1) bind$inet6(r1, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c) listen(r1, 0x0) r5 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r5, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10) sendmsg$nl_route(r0, &(0x7f0000000080)={0x0, 0x0, &(0x7f0000000500)={&(0x7f00000002c0)=@newlink={0x4c, 0x10, 0x100, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x40000, 0x5021}, [@IFLA_LINKINFO={0x2c, 0x12, 0x0, 0x1, @ipoib={{0xa}, {0x1c, 0x2, 0x0, 0x1, [@IFLA_IPOIB_PKEY={0x6, 0x1, 0x7ff}, @IFLA_IPOIB_UMCAST={0x6, 0x3, 0x1}, @IFLA_IPOIB_PKEY={0x6, 0x1, 0x8}]}}}]}, 0x4c}}, 0x0) [ 74.385434][ T44] Bluetooth: hci0: command tx timeout [ 74.448848][ T5323] smc: net device bridge_slave_0 applied user defined pnetid SYZ1 [ 74.497811][ T5322] [ 74.499003][ T5322] ====================================================== [ 74.502064][ T5322] WARNING: possible circular locking dependency detected [ 74.505408][ T5322] syzkaller #0 Not tainted [ 74.507768][ T5322] ------------------------------------------------------ [ 74.511456][ T5322] syz.0.0/5322 is trying to acquire lock: [ 74.514461][ T5322] ffff888012910a68 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 [ 74.519623][ T5322] [ 74.519623][ T5322] but task is already holding lock: [ 74.522849][ T5322] ffff888012910ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 [ 74.526832][ T5322] [ 74.526832][ T5322] which lock already depends on the new lock. [ 74.526832][ T5322] [ 74.531198][ T5322] [ 74.531198][ T5322] the existing dependency chain (in reverse order) is: [ 74.535126][ T5322] [ 74.535126][ T5322] -> #1 (sk_lock-AF_SMC/1){+.+.}-{0:0}: [ 74.538491][ T5322] lock_sock_nested+0x41/0x100 [ 74.540712][ T5322] smc_listen_out+0x109/0x3e0 [ 74.543007][ T5322] smc_listen_work+0x813/0x13f0 [ 74.545497][ T5322] process_scheduled_works+0xb5d/0x1860 [ 74.548091][ T5322] worker_thread+0xa53/0xfc0 [ 74.550457][ T5322] kthread+0x389/0x470 [ 74.552532][ T5322] ret_from_fork+0x514/0xb70 [ 74.554857][ T5322] ret_from_fork_asm+0x1a/0x30 [ 74.557256][ T5322] [ 74.557256][ T5322] -> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}: [ 74.561651][ T5322] __lock_acquire+0x15a5/0x2cf0 [ 74.563922][ T5322] lock_acquire+0x106/0x350 [ 74.565984][ T5322] __flush_work+0x700/0xc50 [ 74.568026][ T5322] __cancel_work_sync+0xbe/0x110 [ 74.570236][ T5322] smc_clcsock_release+0x60/0xf0 [ 74.572462][ T5322] __smc_release+0x66b/0x7e0 [ 74.574668][ T5322] smc_close_non_accepted+0xd5/0x1f0 [ 74.577207][ T5322] smc_close_active+0xb67/0xf10 [ 74.579386][ T5322] __smc_release+0x8d/0x7e0 [ 74.581860][ T5322] smc_release+0x2ce/0x560 [ 74.584049][ T5322] sock_close+0xc3/0x240 [ 74.586163][ T5322] __fput+0x44f/0xa60 [ 74.588179][ T5322] task_work_run+0x1d9/0x270 [ 74.590437][ T5322] exit_to_user_mode_loop+0xf3/0x4d0 [ 74.593035][ T5322] do_syscall_64+0x33e/0x560 [ 74.595277][ T5322] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.598092][ T5322] [ 74.598092][ T5322] other info that might help us debug this: [ 74.598092][ T5322] [ 74.602531][ T5322] Possible unsafe locking scenario: [ 74.602531][ T5322] [ 74.605683][ T5322] CPU0 CPU1 [ 74.607976][ T5322] ---- ---- [ 74.610316][ T5322] lock(sk_lock-AF_SMC/1); [ 74.612395][ T5322] lock((work_completion)(&new_smc->smc_listen_work)); [ 74.616523][ T5322] lock(sk_lock-AF_SMC/1); [ 74.619735][ T5322] lock((work_completion)(&new_smc->smc_listen_work)); [ 74.622948][ T5322] [ 74.622948][ T5322] *** DEADLOCK *** [ 74.622948][ T5322] [ 74.626556][ T5322] 3 locks held by syz.0.0/5322: [ 74.628622][ T5322] #0: ffff88801f03d440 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 [ 74.633190][ T5322] #1: ffff888012910ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 [ 74.637277][ T5322] #2: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 [ 74.641373][ T5322] [ 74.641373][ T5322] stack backtrace: [ 74.643833][ T5322] CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 74.643847][ T5322] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 74.643855][ T5322] Call Trace: [ 74.643862][ T5322] [ 74.643868][ T5322] dump_stack_lvl+0xe8/0x150 [ 74.643881][ T5322] print_circular_bug+0x2e1/0x300 [ 74.643900][ T5322] check_noncircular+0x12e/0x150 [ 74.643914][ T5322] __lock_acquire+0x15a5/0x2cf0 [ 74.643926][ T5322] ? do_raw_spin_lock+0x12b/0x2f0 [ 74.643942][ T5322] ? __flush_work+0x100/0xc50 [ 74.643953][ T5322] lock_acquire+0x106/0x350 [ 74.643963][ T5322] ? __flush_work+0x100/0xc50 [ 74.643975][ T5322] ? __flush_work+0x100/0xc50 [ 74.643986][ T5322] __flush_work+0x700/0xc50 [ 74.643997][ T5322] ? __flush_work+0x100/0xc50 [ 74.644009][ T5322] ? __flush_work+0x100/0xc50 [ 74.644021][ T5322] ? __pfx___flush_work+0x10/0x10 [ 74.644032][ T5322] ? __pfx_wq_barrier_func+0x10/0x10 [ 74.644046][ T5322] ? __cancel_work_sync+0x5c/0x110 [ 74.644059][ T5322] __cancel_work_sync+0xbe/0x110 [ 74.644070][ T5322] smc_clcsock_release+0x60/0xf0 [ 74.644082][ T5322] __smc_release+0x66b/0x7e0 [ 74.644097][ T5322] ? __local_bh_enable_ip+0xd0/0x130 [ 74.644108][ T5322] smc_close_non_accepted+0xd5/0x1f0 [ 74.644122][ T5322] smc_close_active+0xb67/0xf10 [ 74.644132][ T5322] ? __pfx_sock_def_readable+0x10/0x10 [ 74.644148][ T5322] __smc_release+0x8d/0x7e0 [ 74.644159][ T5322] ? __local_bh_enable_ip+0xd0/0x130 [ 74.644170][ T5322] smc_release+0x2ce/0x560 [ 74.644182][ T5322] sock_close+0xc3/0x240 [ 74.644192][ T5322] ? __pfx_sock_close+0x10/0x10 [ 74.644201][ T5322] __fput+0x44f/0xa60 [ 74.644212][ T5322] task_work_run+0x1d9/0x270 [ 74.644227][ T5322] ? __pfx_task_work_run+0x10/0x10 [ 74.644242][ T5322] exit_to_user_mode_loop+0xf3/0x4d0 [ 74.644253][ T5322] ? rcu_is_watching+0x15/0xb0 [ 74.644266][ T5322] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.644277][ T5322] do_syscall_64+0x33e/0x560 [ 74.644286][ T5322] ? trace_irq_disable+0x3b/0x140 [ 74.644302][ T5322] ? clear_bhb_loop+0x40/0x90 [ 74.644313][ T5322] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.644323][ T5322] RIP: 0033:0x7fbd5b59ce59 [ 74.644334][ T5322] 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 [ 74.644343][ T5322] RSP: 002b:00007fff17a95368 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 74.644356][ T5322] RAX: 0000000000000000 RBX: 00007fff17a95450 RCX: 00007fbd5b59ce59 [ 74.644363][ T5322] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 74.644369][ T5322] RBP: 0000000000012230 R08: 0000000000000001 R09: 0000000000000000 [ 74.644375][ T5322] R10: 00007fbd5b3ff030 R11: 0000000000000246 R12: 00007fff17a95490 [ 74.644382][ T5322] R13: 00007fbd5b815fac R14: 00000000000122a7 R15: 00007fbd5b815fa0 [ 74.644392][ T5322]