[ 40.661311] audit: type=1800 audit(1582086642.728:32): pid=7887 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 46.002265] kauditd_printk_skb: 2 callbacks suppressed [ 46.002280] audit: type=1400 audit(1582086648.148:35): avc: denied { map } for pid=8063 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. executing program [ 59.013820] audit: type=1400 audit(1582086661.168:36): avc: denied { map } for pid=8075 comm="syz-executor666" path="/root/syz-executor666265623" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 59.031080] IPVS: ftp: loaded support on port[0] = 21 [ 59.092714] [ 59.094406] ================================ [ 59.098791] WARNING: inconsistent lock state [ 59.103225] 4.19.104-syzkaller #0 Not tainted [ 59.107700] -------------------------------- [ 59.112086] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 59.118209] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 59.123469] 000000003f92b4bd (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x683/0xc20 [ 59.133690] {SOFTIRQ-ON-W} state was registered at: [ 59.138802] lock_acquire+0x16f/0x3f0 [ 59.142696] _raw_spin_lock+0x2f/0x40 [ 59.146564] rxrpc_connect_call+0x351/0x4920 [ 59.151042] rxrpc_new_client_call+0x8e7/0x1880 [ 59.155779] rxrpc_do_sendmsg+0xfc3/0x1ca3 [ 59.160093] rxrpc_sendmsg+0x4a0/0x5b0 [ 59.164061] sock_sendmsg+0xd7/0x130 [ 59.167850] ___sys_sendmsg+0x3e2/0x920 [ 59.171898] __sys_sendmmsg+0x1bf/0x4e0 [ 59.175980] __x64_sys_sendmmsg+0x9d/0x100 [ 59.180288] do_syscall_64+0xfd/0x620 [ 59.184172] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.189427] irq event stamp: 208160 [ 59.193112] hardirqs last enabled at (208160): [] _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 59.203016] hardirqs last disabled at (208159): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 59.212363] softirqs last enabled at (208052): [] _local_bh_enable+0x1c/0x30 [ 59.221197] softirqs last disabled at (208053): [] irq_exit+0x180/0x1d0 [ 59.229488] [ 59.229488] other info that might help us debug this: [ 59.236144] Possible unsafe locking scenario: [ 59.236144] [ 59.242181] CPU0 [ 59.244742] ---- [ 59.247302] lock(&(&local->client_conns_lock)->rlock); [ 59.252735] [ 59.255479] lock(&(&local->client_conns_lock)->rlock); [ 59.261095] [ 59.261095] *** DEADLOCK *** [ 59.261095] [ 59.267140] 1 lock held by swapper/0/0: [ 59.271092] #0: 00000000129c49d7 (rcu_callback){....}, at: rcu_process_callbacks+0xc79/0x1a30 [ 59.279838] [ 59.279838] stack backtrace: [ 59.284320] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.104-syzkaller #0 [ 59.291431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.300778] Call Trace: [ 59.303343] [ 59.305483] dump_stack+0x197/0x210 [ 59.309094] print_usage_bug.cold+0x330/0x42a [ 59.313581] ? save_stack_trace+0x1a/0x20 [ 59.317710] mark_lock+0xd1b/0x1370 [ 59.321332] ? check_usage_backwards+0x340/0x340 [ 59.326082] __lock_acquire+0xc62/0x49c0 [ 59.330125] ? mark_held_locks+0x100/0x100 [ 59.334356] ? save_stack+0x45/0xd0 [ 59.337983] ? __kasan_slab_free+0x102/0x150 [ 59.342393] ? kasan_slab_free+0xe/0x10 [ 59.346373] ? kfree+0xcf/0x220 [ 59.349650] ? mark_held_locks+0x100/0x100 [ 59.353908] ? find_held_lock+0x35/0x130 [ 59.357950] ? debug_object_deactivate+0x1e4/0x360 [ 59.362862] ? mark_held_locks+0x100/0x100 [ 59.367279] ? debug_object_deactivate+0x1e4/0x360 [ 59.372274] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 59.377392] ? lockdep_hardirqs_on+0x19b/0x5d0 [ 59.381972] lock_acquire+0x16f/0x3f0 [ 59.385768] ? rxrpc_put_client_conn+0x683/0xc20 [ 59.390539] _raw_spin_lock+0x2f/0x40 [ 59.394364] ? rxrpc_put_client_conn+0x683/0xc20 [ 59.399157] rxrpc_put_client_conn+0x683/0xc20 [ 59.403728] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 59.408489] ? rxrpc_process_call.cold+0x20/0x20 [ 59.413248] rxrpc_rcu_destroy_call+0xbd/0x200 [ 59.417827] rcu_process_callbacks+0xba0/0x1a30 [ 59.422478] ? __rcu_read_unlock+0x170/0x170 [ 59.426888] __do_softirq+0x25c/0x921 [ 59.430675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.436209] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.441748] irq_exit+0x180/0x1d0 [ 59.445186] smp_apic_timer_interrupt+0x13b/0x550 [ 59.450018] apic_timer_interrupt+0xf/0x20 [ 59.454235] [ 59.456455] RIP: 0010:native_safe_halt+0xe/0x10 [ 59.461106] Code: ff ff 48 89 df e8 92 f8 4d fa eb 82 e9 07 00 00 00 0f 00 2d 74 61 53 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 64 61 53 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be cc 04 fa e8 d9 [ 59.480002] RSP: 0018:ffffffff88e07cb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 59.487714] RAX: 1ffffffff11e4ad4 RBX: ffffffff88e79ec0 RCX: 0000000000000000 [ 59.494973] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff88e7a73c [ 59.502244] RBP: ffffffff88e07ce0 R08: ffffffff88e79ec0 R09: 0000000000000000 [ 59.509502] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 59.516759] R13: ffffffff88f25690 R14: 0000000000000000 R15: ffffffff88e79ec0 [ 59.524031] ? default_idle+0x4e/0x320 [ 59.527919] arch_cpu_idle+0xa/0x10 [ 59.531529] default_idle_call+0x36/0x90 [ 59.535577] do_idle+0x30c/0x4d0 [ 59.538927] ? arch_cpu_idle_exit+0x80/0x80 [ 59.543235] ? check_preemption_disabled+0x48/0x290 [ 59.548246] cpu_startup_entry+0xc8/0xe0 [ 59.552287] ? cpu_in_idle+0x20/0x20 [ 59.555986] rest_init+0x219/0x222 [ 59.559516] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 59.566002] start_kernel+0x7ec/0x825 [ 59.569798] ? mem_encrypt_init+0xb/0xb [ 59.573769] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.579845] ? x86_family+0x41/0x50 [ 59.583452] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 59.588990] x86_64_start_reservations+0x29/0x2b [ 59.593727]