Warning: Permanently added '10.128.0.127' (ECDSA) to the list of known hosts.
[   40.982675] random: sshd: uninitialized urandom read (32 bytes read)
[   41.106211] audit: type=1400 audit(1572331695.085:36): avc:  denied  { map } for  pid=6880 comm="syz-executor071" path="/root/syz-executor071019577" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   41.381161] IPVS: ftp: loaded support on port[0] = 21
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[   61.631339] 
[   61.633094] ======================================================
[   61.639461] WARNING: possible circular locking dependency detected
[   61.645773] 4.14.150 #0 Not tainted
[   61.649375] ------------------------------------------------------
[   61.655679] syz-executor071/7190 is trying to acquire lock:
[   61.661388]  (&event->child_mutex){+.+.}, at: [<ffffffff816bfab0>] perf_read+0x2c0/0x820
[   61.669620] 
[   61.669620] but task is already holding lock:
[   61.675576]  (&cpuctx_mutex){+.+.}, at: [<ffffffff816bd1a0>] perf_event_ctx_lock_nested+0x150/0x2c0
[   61.684745] 
[   61.684745] which lock already depends on the new lock.
[   61.684745] 
[   61.693035] 
[   61.693035] the existing dependency chain (in reverse order) is:
[   61.700629] 
[   61.700629] -> #5 (&cpuctx_mutex){+.+.}:
[   61.706376]        lock_acquire+0x16f/0x430
[   61.710679]        __mutex_lock+0xe8/0x1470
[   61.714975]        mutex_lock_nested+0x16/0x20
[   61.719536]        perf_event_init_cpu+0xc2/0x170
[   61.724357]        perf_event_init+0x2d8/0x31a
[   61.728914]        start_kernel+0x3b6/0x6fd
[   61.733214]        x86_64_start_reservations+0x29/0x2b
[   61.738465]        x86_64_start_kernel+0x77/0x7b
[   61.743226]        secondary_startup_64+0xa5/0xb0
[   61.748059] 
[   61.748059] -> #4 (pmus_lock){+.+.}:
[   61.753245]        lock_acquire+0x16f/0x430
[   61.757562]        __mutex_lock+0xe8/0x1470
[   61.761872]        mutex_lock_nested+0x16/0x20
[   61.766441]        perf_event_init_cpu+0x2f/0x170
[   61.771273]        cpuhp_invoke_callback+0x1ea/0x1ab0
[   61.776441]        _cpu_up+0x228/0x530
[   61.780310]        do_cpu_up+0x121/0x150
[   61.784343]        cpu_up+0x1b/0x20
[   61.787965]        smp_init+0x157/0x170
[   61.791915]        kernel_init_freeable+0x30b/0x532
[   61.796905]        kernel_init+0x12/0x162
[   61.801036]        ret_from_fork+0x24/0x30
[   61.805243] 
[   61.805243] -> #3 (cpu_hotplug_lock.rw_sem){++++}:
[   61.811631]        lock_acquire+0x16f/0x430
[   61.815936]        cpus_read_lock+0x3d/0xc0
[   61.820247]        static_key_slow_inc+0x13/0x30
[   61.824989]        tracepoint_probe_register_prio+0x4d6/0x6d0
[   61.830847]        tracepoint_probe_register+0x2b/0x40
[   61.836095]        trace_event_reg+0x277/0x330
[   61.840660]        perf_trace_init+0x449/0xaa0
[   61.845218]        perf_tp_event_init+0x7d/0xf0
[   61.849882]        perf_try_init_event+0x164/0x200
[   61.854786]        perf_event_alloc.part.0+0xd90/0x25b0
[   61.860122]        SYSC_perf_event_open+0xad1/0x2690
[   61.865206]        SyS_perf_event_open+0x34/0x40
[   61.869938]        do_syscall_64+0x1e8/0x640
[   61.874321]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.880001] 
[   61.880001] -> #2 (tracepoints_mutex){+.+.}:
[   61.885879]        lock_acquire+0x16f/0x430
[   61.890178]        __mutex_lock+0xe8/0x1470
[   61.894546]        mutex_lock_nested+0x16/0x20
[   61.899121]        tracepoint_probe_register_prio+0x36/0x6d0
[   61.904905]        tracepoint_probe_register+0x2b/0x40
[   61.910158]        trace_event_reg+0x277/0x330
[   61.914712]        perf_trace_init+0x449/0xaa0
[   61.919322]        perf_tp_event_init+0x7d/0xf0
[   61.923966]        perf_try_init_event+0x164/0x200
[   61.928899]        perf_event_alloc.part.0+0xd90/0x25b0
[   61.934278]        SYSC_perf_event_open+0xad1/0x2690
[   61.939352]        SyS_perf_event_open+0x34/0x40
[   61.944082]        do_syscall_64+0x1e8/0x640
[   61.948466]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.954149] 
[   61.954149] -> #1 (event_mutex){+.+.}:
[   61.959608]        lock_acquire+0x16f/0x430
[   61.963928]        __mutex_lock+0xe8/0x1470
[   61.968233]        mutex_lock_nested+0x16/0x20
[   61.972798]        perf_trace_destroy+0x28/0x100
[   61.977530]        tp_perf_event_destroy+0x16/0x20
[   61.982436]        _free_event+0x330/0xe70
[   61.986650]        free_event+0x38/0x50
[   61.990599]        perf_event_release_kernel+0x364/0x880
[   61.996020]        perf_release+0x37/0x50
[   62.000157]        __fput+0x275/0x7a0
[   62.004084]        ____fput+0x16/0x20
[   62.007860]        task_work_run+0x114/0x190
[   62.012257]        exit_to_usermode_loop+0x1da/0x220
[   62.017347]        do_syscall_64+0x4bc/0x640
[   62.021750]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   62.027448] 
[   62.027448] -> #0 (&event->child_mutex){+.+.}:
[   62.033495]        __lock_acquire+0x2cb3/0x4620
[   62.038157]        lock_acquire+0x16f/0x430
[   62.042467]        __mutex_lock+0xe8/0x1470
[   62.046769]        mutex_lock_nested+0x16/0x20
[   62.051325]        perf_read+0x2c0/0x820
[   62.055361]        do_iter_read+0x3e2/0x5b0
[   62.059655]        vfs_readv+0xd3/0x130
[   62.063602]        do_readv+0x10a/0x2d0
[   62.067550]        SyS_readv+0x28/0x30
[   62.071415]        do_syscall_64+0x1e8/0x640
[   62.075814]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   62.081517] 
[   62.081517] other info that might help us debug this:
[   62.081517] 
[   62.089633] Chain exists of:
[   62.089633]   &event->child_mutex --> pmus_lock --> &cpuctx_mutex
[   62.089633] 
[   62.100200]  Possible unsafe locking scenario:
[   62.100200] 
[   62.106256]        CPU0                    CPU1
[   62.110903]        ----                    ----
[   62.115558]   lock(&cpuctx_mutex);
[   62.119082]                                lock(pmus_lock);
[   62.124770]                                lock(&cpuctx_mutex);
[   62.130808]   lock(&event->child_mutex);
[   62.134855] 
[   62.134855]  *** DEADLOCK ***
[   62.134855] 
[   62.140890] 1 lock held by syz-executor071/7190:
[   62.146043]  #0:  (&cpuctx_mutex){+.+.}, at: [<ffffffff816bd1a0>] perf_event_ctx_lock_nested+0x150/0x2c0
[   62.155647] 
[   62.155647] stack backtrace:
[   62.160228] CPU: 0 PID: 7190 Comm: syz-executor071 Not tainted 4.14.150 #0
[   62.167214] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   62.176544] Call Trace:
[   62.179111]  dump_stack+0x138/0x197
[   62.182717]  print_circular_bug.isra.0.cold+0x1cc/0x28f
[   62.190584]  __lock_acquire+0x2cb3/0x4620
[   62.194734]  ? trace_hardirqs_on_caller+0x400/0x590
[   62.199730]  ? trace_hardirqs_on+0x10/0x10
[   62.203946]  ? save_stack+0xa9/0xd0
[   62.207550]  ? kasan_kmalloc+0xce/0xf0
[   62.211416]  ? __kmalloc+0x15d/0x7a0
[   62.215107]  ? perf_read+0x248/0x820
[   62.218804]  lock_acquire+0x16f/0x430
[   62.222580]  ? perf_read+0x2c0/0x820
[   62.226268]  ? perf_read+0x2c0/0x820
[   62.229966]  __mutex_lock+0xe8/0x1470
[   62.233740]  ? perf_read+0x2c0/0x820
[   62.237425]  ? save_trace+0x290/0x290
[   62.241210]  ? perf_read+0x2c0/0x820
[   62.244904]  ? __lock_is_held+0xb6/0x140
[   62.248940]  ? mutex_trylock+0x1c0/0x1c0
[   62.252976]  ? rcu_lockdep_current_cpu_online+0xf2/0x140
[   62.258398]  ? rcu_read_lock_sched_held+0x110/0x130
[   62.263391]  ? __kmalloc+0x376/0x7a0
[   62.267080]  ? __lock_is_held+0xb6/0x140
[   62.271116]  mutex_lock_nested+0x16/0x20
[   62.275159]  ? mutex_lock_nested+0x16/0x20
[   62.279367]  perf_read+0x2c0/0x820
[   62.282895]  ? __perf_read_group_add+0x680/0x680
[   62.287627]  ? selinux_file_permission+0x85/0x480
[   62.292457]  ? security_file_permission+0x89/0x1f0
[   62.297368]  ? rw_verify_area+0xea/0x2b0
[   62.301426]  do_iter_read+0x3e2/0x5b0
[   62.305205]  vfs_readv+0xd3/0x130
[   62.308641]  ? compat_rw_copy_check_uvector+0x310/0x310
[   62.313984]  ? __fget+0x237/0x370
[   62.317421]  ? __fget_light+0x172/0x1f0
[   62.321382]  do_readv+0x10a/0x2d0
[   62.324819]  ? vfs_readv+0x130/0x130
[   62.328508]  ? do_preadv+0x200/0x200
[   62.332197]  SyS_readv+0x28/0x30
[   62.335539]  do_syscall_64+0x1e8/0x640
[   62.339398]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   62.344219]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   62.349426] RIP: 0033:0x442489
[   62.352628] RSP: 002b:00007fff64e6bc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
[   62.360316] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442489
[   62.367569] RDX: 0000000000000001 RSI: 0000000020000200 RDI: 0000000000000004
[   62.374816] RBP: 0000000000000000 R08: 0000000000000045 R09: 0000000000000045
[   62.382061] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000099
[   62.389306] R13: 00000000004032b0 R14: 0000000000000000 R15: 0000000000000000
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