[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.129' (ECDSA) to the list of known hosts. syzkaller login: [ 26.152349] IPVS: ftp: loaded support on port[0] = 21 executing program [ 26.261168] [ 26.262913] ================================ [ 26.267293] WARNING: inconsistent lock state [ 26.271672] 4.14.300-syzkaller #0 Not tainted [ 26.276135] -------------------------------- [ 26.280513] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 26.286629] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 26.291872] (&(&local->client_conns_lock)->rlock){+.?.}, at: [] rxrpc_put_client_conn+0x661/0xac0 [ 26.302516] {SOFTIRQ-ON-W} state was registered at: [ 26.307513] lock_acquire+0x170/0x3f0 [ 26.311373] _raw_spin_lock+0x2a/0x40 [ 26.315235] rxrpc_connect_call+0x2bb/0x3e10 [ 26.319721] rxrpc_new_client_call+0x8f4/0x1a10 [ 26.324454] rxrpc_do_sendmsg+0x8dc/0xfb0 [ 26.328661] rxrpc_sendmsg+0x3cf/0x5f0 [ 26.332609] sock_sendmsg+0xb5/0x100 [ 26.336381] ___sys_sendmsg+0x6c8/0x800 [ 26.340411] __sys_sendmsg+0xa3/0x120 [ 26.344269] SyS_sendmsg+0x27/0x40 [ 26.347871] do_syscall_64+0x1d5/0x640 [ 26.351819] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 26.357081] irq event stamp: 92156 [ 26.360595] hardirqs last enabled at (92156): [] _raw_spin_unlock_irqrestore+0x79/0xe0 [ 26.370284] hardirqs last disabled at (92155): [] _raw_spin_lock_irqsave+0x66/0xc0 [ 26.379536] softirqs last enabled at (91800): [] irq_enter+0xbd/0xd0 [ 26.387655] softirqs last disabled at (91801): [] irq_exit+0x193/0x240 [ 26.395851] [ 26.395851] other info that might help us debug this: [ 26.402486] Possible unsafe locking scenario: [ 26.402486] [ 26.408514] CPU0 [ 26.411081] ---- [ 26.413634] lock(&(&local->client_conns_lock)->rlock); [ 26.419057] [ 26.421783] lock(&(&local->client_conns_lock)->rlock); [ 26.427376] [ 26.427376] *** DEADLOCK *** [ 26.427376] [ 26.433406] 1 lock held by swapper/1/0: [ 26.437355] #0: (rcu_callback){....}, at: [] rcu_process_callbacks+0x84e/0x1180 [ 26.446518] [ 26.446518] stack backtrace: [ 26.450986] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.300-syzkaller #0 [ 26.458055] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 26.467385] Call Trace: [ 26.469946] [ 26.472072] dump_stack+0x1b2/0x281 [ 26.475670] print_usage_bug.cold+0x42e/0x570 [ 26.480144] mark_lock+0xb4d/0x1050 [ 26.483740] ? print_irq_inversion_bug+0xd0/0xd0 [ 26.488488] __lock_acquire+0xc81/0x3f20 [ 26.492520] ? __lock_acquire+0x5fc/0x3f20 [ 26.496726] ? trace_hardirqs_on+0x10/0x10 [ 26.500932] ? lock_acquire+0x170/0x3f0 [ 26.504879] ? debug_object_deactivate+0x1da/0x2e0 [ 26.509781] ? trace_hardirqs_on+0x10/0x10 [ 26.513988] ? lock_acquire+0x170/0x3f0 [ 26.517948] ? lock_downgrade+0x740/0x740 [ 26.522079] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 26.527280] lock_acquire+0x170/0x3f0 [ 26.531062] ? rxrpc_put_client_conn+0x661/0xac0 [ 26.535794] _raw_spin_lock+0x2a/0x40 [ 26.539571] ? rxrpc_put_client_conn+0x661/0xac0 [ 26.544301] rxrpc_put_client_conn+0x661/0xac0 [ 26.548859] ? rxrpc_rcu_destroy_call+0x83/0x190 [ 26.553592] rxrpc_rcu_destroy_call+0x83/0x190 [ 26.558149] ? rxrpc_call_timer_expired+0x70/0x70 [ 26.562963] rcu_process_callbacks+0x780/0x1180 [ 26.567607] ? note_gp_changes+0x2f0/0x2f0 [ 26.571819] ? sched_clock+0x2a/0x40 [ 26.575505] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 26.580930] __do_softirq+0x24d/0x9ff [ 26.584703] ? check_preemption_disabled+0x35/0x240 [ 26.589696] irq_exit+0x193/0x240 [ 26.593121] smp_apic_timer_interrupt+0x141/0x5e0 [ 26.597935] apic_timer_interrupt+0x93/0xa0 [ 26.602225] [ 26.604435] ? native_safe_halt+0xe/0x10 [ 26.608467] ? default_idle+0x47/0x370 [ 2