[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   30.729719] random: sshd: uninitialized urandom read (32 bytes read)
[   30.967925] kauditd_printk_skb: 9 callbacks suppressed
[   30.967934] audit: type=1400 audit(1571687031.064:35): avc:  denied  { map } for  pid=6867 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
[   31.010498] random: sshd: uninitialized urandom read (32 bytes read)
[   31.596904] random: sshd: uninitialized urandom read (32 bytes read)
[   47.152064] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts.
[   56.214871] random: sshd: uninitialized urandom read (32 bytes read)
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[   56.334345] audit: type=1400 audit(1571687056.434:36): avc:  denied  { map } for  pid=6881 comm="syz-executor922" path="/root/syz-executor922102549" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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[   61.048651] 
[   61.050332] ======================================================
[   61.056642] WARNING: possible circular locking dependency detected
[   61.062958] 4.14.150 #0 Not tainted
[   61.066592] ------------------------------------------------------
[   61.072922] syz-executor922/8158 is trying to acquire lock:
[   61.078641]  (event_mutex){+.+.}, at: [<ffffffff8162d678>] perf_trace_destroy+0x28/0x100
[   61.086901] 
[   61.086901] but task is already holding lock:
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[   61.092874]  (&event->child_mutex){+.+.}, at: [<ffffffff816d5867>] perf_event_release_kernel+0x207/0x880
[   61.102507] 
[   61.102507] which lock already depends on the new lock.
[   61.102507] 
[   61.110818] 
[   61.110818] the existing dependency chain (in reverse order) is:
[   61.118434] 
[   61.118434] -> #5 (&event->child_mutex){+.+.}:
[   61.124518]        lock_acquire+0x16f/0x430
[   61.128865]        __mutex_lock+0xe8/0x1470
[   61.133192]        mutex_lock_nested+0x16/0x20
[   61.137787]        perf_event_for_each_child+0x8a/0x150
[   61.143433]        perf_ioctl+0x1d9/0xdf0
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[   61.147590]        do_vfs_ioctl+0x7ae/0x1060
[   61.152009]        SyS_ioctl+0x8f/0xc0
[   61.155943]        do_syscall_64+0x1e8/0x640
[   61.160366]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.166270] 
[   61.166270] -> #4 (&cpuctx_mutex){+.+.}:
[   61.171829]        lock_acquire+0x16f/0x430
[   61.176253]        __mutex_lock+0xe8/0x1470
[   61.180590]        mutex_lock_nested+0x16/0x20
[   61.185188]        perf_event_init_cpu+0xc2/0x170
[   61.190153]        perf_event_init+0x2d8/0x31a
[   61.194852]        start_kernel+0x3b6/0x6fd
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[   61.199183]        x86_64_start_reservations+0x29/0x2b
[   61.204499]        x86_64_start_kernel+0x77/0x7b
[   61.209263]        secondary_startup_64+0xa5/0xb0
[   61.214130] 
[   61.214130] -> #3 (pmus_lock){+.+.}:
[   61.219343]        lock_acquire+0x16f/0x430
[   61.223720]        __mutex_lock+0xe8/0x1470
[   61.228057]        mutex_lock_nested+0x16/0x20
[   61.232732]        perf_event_init_cpu+0x2f/0x170
[   61.237585]        cpuhp_invoke_callback+0x1ea/0x1ab0
[   61.242787]        _cpu_up+0x228/0x530
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[   61.246691]        do_cpu_up+0x121/0x150
[   61.250770]        cpu_up+0x1b/0x20
[   61.254427]        smp_init+0x157/0x170
[   61.258415]        kernel_init_freeable+0x30b/0x532
[   61.263642]        kernel_init+0x12/0x162
[   61.267809]        ret_from_fork+0x24/0x30
[   61.272047] 
[   61.272047] -> #2 (cpu_hotplug_lock.rw_sem){++++}:
[   61.278483]        lock_acquire+0x16f/0x430
[   61.282813]        cpus_read_lock+0x3d/0xc0
[   61.287158]        static_key_slow_inc+0x13/0x30
[   61.291921]        tracepoint_probe_register_prio+0x4d6/0x6d0
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[   61.297810]        tracepoint_probe_register+0x2b/0x40
[   61.303091]        trace_event_reg+0x277/0x330
[   61.307940]        perf_trace_init+0x449/0xaa0
[   61.312526]        perf_tp_event_init+0x7d/0xf0
[   61.317226]        perf_try_init_event+0x164/0x200
[   61.322166]        perf_event_alloc.part.0+0xd90/0x25b0
[   61.327538]        SYSC_perf_event_open+0xad1/0x2690
[   61.332656]        SyS_perf_event_open+0x34/0x40
[   61.337423]        do_syscall_64+0x1e8/0x640
[   61.341855]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.347560] 
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[   61.347560] -> #1 (tracepoints_mutex){+.+.}:
[   61.353475]        lock_acquire+0x16f/0x430
[   61.357800]        __mutex_lock+0xe8/0x1470
[   61.362238]        mutex_lock_nested+0x16/0x20
[   61.366826]        tracepoint_probe_register_prio+0x36/0x6d0
[   61.372637]        tracepoint_probe_register+0x2b/0x40
[   61.377930]        trace_event_reg+0x277/0x330
[   61.382525]        perf_trace_init+0x449/0xaa0
[   61.387116]        perf_tp_event_init+0x7d/0xf0
[   61.391791]        perf_try_init_event+0x164/0x200
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[   61.396757]        perf_event_alloc.part.0+0xd90/0x25b0
[   61.402131]        SYSC_perf_event_open+0xad1/0x2690
[   61.407249]        SyS_perf_event_open+0x34/0x40
[   61.412019]        do_syscall_64+0x1e8/0x640
[   61.416633]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.422346] 
[   61.422346] -> #0 (event_mutex){+.+.}:
[   61.427729]        __lock_acquire+0x2cb3/0x4620
[   61.432452]        lock_acquire+0x16f/0x430
[   61.436809]        __mutex_lock+0xe8/0x1470
[   61.441134]        mutex_lock_nested+0x16/0x20
[   61.445732]        perf_trace_destroy+0x28/0x100
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[   61.450514]        tp_perf_event_destroy+0x16/0x20
[   61.455461]        _free_event+0x330/0xe70
[   61.459712]        free_event+0x38/0x50
[   61.463692]        perf_event_release_kernel+0x364/0x880
[   61.469193]        perf_release+0x37/0x50
[   61.473388]        __fput+0x275/0x7a0
[   61.477224]        ____fput+0x16/0x20
[   61.481037]        task_work_run+0x114/0x190
[   61.485474]        do_exit+0x7df/0x2c10
[   61.489461]        do_group_exit+0x111/0x330
[   61.493875]        get_signal+0x381/0x1cd0
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[   61.498117]        do_signal+0x86/0x19a0
[   61.502189]        exit_to_usermode_loop+0x15c/0x220
[   61.507310]        do_syscall_64+0x4bc/0x640
[   61.511985]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.517693] 
[   61.517693] other info that might help us debug this:
[   61.517693] 
[   61.525835] Chain exists of:
[   61.525835]   event_mutex --> &cpuctx_mutex --> &event->child_mutex
[   61.525835] 
[   61.536690]  Possible unsafe locking scenario:
[   61.536690] 
[   61.542753]        CPU0                    CPU1
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[   61.547419]        ----                    ----
[   61.552092]   lock(&event->child_mutex);
[   61.556151]                                lock(&cpuctx_mutex);
[   61.562216]                                lock(&event->child_mutex);
[   61.568796]   lock(event_mutex);
[   61.572159] 
[   61.572159]  *** DEADLOCK ***
[   61.572159] 
[   61.578218] 2 locks held by syz-executor922/8158:
[   61.583057]  #0:  (&ctx->mutex){+.+.}, at: [<ffffffff816d585d>] perf_event_release_kernel+0x1fd/0x880
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[   61.592777]  #1:  (&event->child_mutex){+.+.}, at: [<ffffffff816d5867>] perf_event_release_kernel+0x207/0x880
[   61.602845] 
[   61.602845] stack backtrace:
[   61.607342] CPU: 1 PID: 8158 Comm: syz-executor922 Not tainted 4.14.150 #0
[   61.614350] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.623724] Call Trace:
[   61.626319]  dump_stack+0x138/0x197
[   61.629966]  print_circular_bug.isra.0.cold+0x1cc/0x28f
[   61.635340]  __lock_acquire+0x2cb3/0x4620
[   61.639491]  ? event_function+0x28b/0x380
[   61.643646]  ? trace_hardirqs_on+0x10/0x10
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[   61.647891]  lock_acquire+0x16f/0x430
[   61.651699]  ? perf_trace_destroy+0x28/0x100
[   61.656115]  ? perf_trace_destroy+0x28/0x100
[   61.660536]  __mutex_lock+0xe8/0x1470
[   61.664345]  ? perf_trace_destroy+0x28/0x100
[   61.668757]  ? perf_trace_destroy+0x28/0x100
[   61.673167]  ? alloc_perf_context+0xf0/0xf0
[   61.677490]  ? mutex_trylock+0x1c0/0x1c0
[   61.681582]  ? save_trace+0x290/0x290
[   61.685385]  ? __mutex_lock+0x36a/0x1470
[   61.689453]  ? perf_event_release_kernel+0x1f3/0x880
[   61.694561]  ? __lock_is_held+0xb6/0x140
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[   61.698656]  ? check_preemption_disabled+0x3c/0x250
[   61.703706]  mutex_lock_nested+0x16/0x20
[   61.707781]  ? mutex_lock_nested+0x16/0x20
[   61.712063]  perf_trace_destroy+0x28/0x100
[   61.716339]  tp_perf_event_destroy+0x16/0x20
[   61.720755]  ? perf_tp_event_init+0xf0/0xf0
[   61.725109]  _free_event+0x330/0xe70
[   61.728830]  free_event+0x38/0x50
[   61.732301]  perf_event_release_kernel+0x364/0x880
[   61.737248]  ? perf_event_release_kernel+0x880/0x880
[   61.742358]  perf_release+0x37/0x50
[   61.745990]  __fput+0x275/0x7a0
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[   61.749276]  ____fput+0x16/0x20
[   61.752568]  task_work_run+0x114/0x190
[   61.756468]  do_exit+0x7df/0x2c10
[   61.760028]  ? find_held_lock+0x35/0x130
[   61.764105]  ? mm_update_next_owner+0x5d0/0x5d0
[   61.768814]  do_group_exit+0x111/0x330
[   61.772716]  get_signal+0x381/0x1cd0
[   61.776556]  ? __fd_install+0x236/0x5f0
[   61.780550]  do_signal+0x86/0x19a0
[   61.784104]  ? wait_for_completion+0x420/0x420
[   61.788702]  ? fd_install+0x4d/0x60
[   61.792338]  ? setup_sigcontext+0x7d0/0x7d0
[   61.796669]  ? SYSC_perf_event_open+0x61c/0x2690
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[   61.801462]  ? find_held_lock+0x35/0x130
[   61.805546]  ? perf_event_set_output+0x460/0x460
[   61.810369]  ? SyS_futex+0x215/0x302
[   61.814132]  ? SyS_futex+0x222/0x302
[   61.817864]  ? exit_to_usermode_loop+0x3d/0x220
[   61.822581]  exit_to_usermode_loop+0x15c/0x220
[   61.827270]  do_syscall_64+0x4bc/0x640
[   61.831164]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   61.836018]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   61.841215] RIP: 0033:0x446969
[   61.844508] RSP: 002b:00007fbdbacacdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
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[   61.852230] RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 0000000000446969
[   61.859506] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38
[   61.866779] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000
[   61.874085] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
[   61.881365] R13: 00007ffe9b26cfcf R14: 00007fbdbacad9c0 R15: 000000000000002d
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