[ 96.770488][ T27] audit: type=1800 audit(1581073201.743:25): pid=9772 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 97.772417][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 97.772429][ T27] audit: type=1800 audit(1581073202.743:29): pid=9772 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 97.798963][ T27] audit: type=1800 audit(1581073202.743:30): pid=9772 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.82' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 105.302607][ T9928] IPVS: ftp: loaded support on port[0] = 21 [ 105.358138][ C0] [ 105.360494][ C0] ================================ [ 105.365576][ C0] WARNING: inconsistent lock state [ 105.370752][ C0] 5.5.0-syzkaller #0 Not tainted [ 105.375662][ C0] -------------------------------- [ 105.380775][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 105.387601][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 105.393556][ C0] ffff8880a2c4b9c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 105.404486][ C0] {SOFTIRQ-ON-W} state was registered at: [ 105.410200][ C0] lock_acquire+0x190/0x410 [ 105.414767][ C0] _raw_spin_lock+0x2f/0x40 [ 105.419347][ C0] rxrpc_connect_call+0x358/0x4e30 [ 105.424537][ C0] rxrpc_new_client_call+0x9c0/0x1ad0 [ 105.429973][ C0] rxrpc_do_sendmsg+0xffa/0x1d5f [ 105.434984][ C0] rxrpc_sendmsg+0x4d6/0x5f0 [ 105.439655][ C0] sock_sendmsg+0xd7/0x130 [ 105.444133][ C0] ____sys_sendmsg+0x358/0x880 [ 105.448965][ C0] ___sys_sendmsg+0x100/0x170 [ 105.453709][ C0] __sys_sendmmsg+0x1bf/0x4d0 [ 105.458527][ C0] __x64_sys_sendmmsg+0x9d/0x100 [ 105.463568][ C0] do_syscall_64+0xfa/0x790 [ 105.468143][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.474092][ C0] irq event stamp: 164994 [ 105.478402][ C0] hardirqs last enabled at (164994): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 105.489000][ C0] hardirqs last disabled at (164993): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 105.499475][ C0] softirqs last enabled at (164914): [] _local_bh_enable+0x1c/0x30 [ 105.509018][ C0] softirqs last disabled at (164915): [] irq_exit+0x19b/0x1e0 [ 105.518123][ C0] [ 105.518123][ C0] other info that might help us debug this: [ 105.526164][ C0] Possible unsafe locking scenario: [ 105.526164][ C0] [ 105.533586][ C0] CPU0 [ 105.536841][ C0] ---- [ 105.540094][ C0] lock(&(&local->client_conns_lock)->rlock); [ 105.546227][ C0] [ 105.549660][ C0] lock(&(&local->client_conns_lock)->rlock); [ 105.556009][ C0] [ 105.556009][ C0] *** DEADLOCK *** [ 105.556009][ C0] [ 105.564138][ C0] 1 lock held by swapper/0/0: [ 105.568785][ C0] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 105.577101][ C0] [ 105.577101][ C0] stack backtrace: [ 105.582975][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-syzkaller #0 [ 105.590552][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.601431][ C0] Call Trace: [ 105.604706][ C0] [ 105.607569][ C0] dump_stack+0x197/0x210 [ 105.611906][ C0] print_usage_bug.cold+0x327/0x378 [ 105.617227][ C0] mark_lock+0xbb4/0x1220 [ 105.621540][ C0] ? kfree+0x10a/0x2c0 [ 105.625588][ C0] ? check_usage_backwards+0x330/0x330 [ 105.631048][ C0] ? __nf_hook_entries_free+0x31/0x40 [ 105.636398][ C0] __lock_acquire+0x1e8e/0x4a00 [ 105.641235][ C0] ? find_held_lock+0x35/0x130 [ 105.645977][ C0] ? __kasan_check_read+0x11/0x20 [ 105.650984][ C0] ? mark_lock+0xc2/0x1220 [ 105.655385][ C0] ? mark_held_locks+0xf0/0xf0 [ 105.660136][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 105.665915][ C0] lock_acquire+0x190/0x410 [ 105.670394][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 105.675840][ C0] _raw_spin_lock+0x2f/0x40 [ 105.680333][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 105.685814][ C0] rxrpc_put_client_conn+0x6ed/0xc90 [ 105.691092][ C0] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 105.696533][ C0] rxrpc_rcu_destroy_call+0xbd/0x200 [ 105.702257][ C0] rcu_core+0x5e1/0x1390 [ 105.706483][ C0] ? __rcu_read_unlock+0x700/0x700 [ 105.711587][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 105.717128][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 105.723101][ C0] ? run_rebalance_domains+0x227/0x2d0 [ 105.728544][ C0] rcu_core_si+0x9/0x10 [ 105.732681][ C0] __do_softirq+0x262/0x98c [ 105.737161][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 105.741992][ C0] irq_exit+0x19b/0x1e0 [ 105.746129][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 105.751649][ C0] apic_timer_interrupt+0xf/0x20 [ 105.756556][ C0] [ 105.759474][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 105.764820][ C0] Code: 48 70 c7 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 44 d3 5b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 34 d3 5b 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 7e 2f 76 f9 e8 19 [ 105.784401][ C0] RSP: 0018:ffffffff89a07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 105.792787][ C0] RAX: 1ffffffff1367612 RBX: ffffffff89a7a440 RCX: 0000000000000000 [ 105.800796][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff89a7acd4 [ 105.808757][ C0] RBP: ffffffff89a07d18 R08: ffffffff89a7a440 R09: 0000000000000000 [ 105.816829][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 105.824873][ C0] R13: ffffffff8aa522c0 R14: 0000000000000000 R15: 0000000000000000 [ 105.832841][ C0] ? default_idle+0x4e/0x360 [ 105.837422][ C0] arch_cpu_idle+0xa/0x10 [ 105.841729][ C0] default_idle_call+0x84/0xb0 [ 105.846481][ C0] do_idle+0x3c8/0x6e0 [ 105.850531][ C0] ? retint_kernel+0x2b/0x2b [ 105.855111][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 105.860121][ C0] ? do_idle+0x398/0x6e0 [ 105.864345][ C0] cpu_startup_entry+0x1b/0x20 [ 105.869090][ C0] rest_init+0x23b/0x371 [ 105.873365][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 105.879594][ C0] arch_call_rest_init+0xe/0x1b [ 105.884422][ C0] start_kernel+0x886/0x8c5 [ 105.888923][ C0] ? mem_encrypt_init+0xb/0xb [ 105.893643][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 105.899921][ C0] ? x86_family+0x41/0x50 [ 105.904756][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20