Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts. [ 59.925414] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 60.043750] audit: type=1400 audit(1560559242.530:36): avc: denied { map } for pid=7164 comm="syz-executor584" path="/root/syz-executor584840997" 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 [ 60.071450] [ 60.073080] ====================================================== [ 60.079370] WARNING: possible circular locking dependency detected [ 60.085694] 4.14.125 #19 Not tainted [ 60.089405] ------------------------------------------------------ [ 60.095700] syz-executor584/7164 is trying to acquire lock: [ 60.101411] (&cpuctx_mutex/1){+.+.}, at: [] SYSC_perf_event_open+0x121f/0x24b0 [ 60.110411] [ 60.110411] but task is already holding lock: [ 60.116378] (&cpuctx_mutex){+.+.}, at: [] SYSC_perf_event_open+0x1212/0x24b0 [ 60.125223] [ 60.125223] which lock already depends on the new lock. [ 60.125223] [ 60.133514] [ 60.133514] the existing dependency chain (in reverse order) is: [ 60.141114] [ 60.141114] -> #5 (&cpuctx_mutex){+.+.}: [ 60.146647] lock_acquire+0x16f/0x430 [ 60.150949] __mutex_lock+0xe8/0x1470 [ 60.155248] mutex_lock_nested+0x16/0x20 [ 60.159808] perf_event_init_cpu+0xc2/0x170 [ 60.164628] perf_event_init+0x2d8/0x31a [ 60.169185] start_kernel+0x3b6/0x6fd [ 60.173486] x86_64_start_reservations+0x29/0x2b [ 60.179695] x86_64_start_kernel+0x77/0x7b [ 60.184446] secondary_startup_64+0xa5/0xb0 [ 60.189277] [ 60.189277] -> #4 (pmus_lock){+.+.}: [ 60.194452] lock_acquire+0x16f/0x430 [ 60.198751] __mutex_lock+0xe8/0x1470 [ 60.203048] mutex_lock_nested+0x16/0x20 [ 60.207609] perf_event_init_cpu+0x2f/0x170 [ 60.212447] cpuhp_invoke_callback+0x1ea/0x1ab0 [ 60.217612] _cpu_up+0x228/0x530 [ 60.221475] do_cpu_up+0x121/0x150 [ 60.225538] cpu_up+0x1b/0x20 [ 60.229158] smp_init+0x157/0x170 [ 60.233109] kernel_init_freeable+0x30b/0x532 [ 60.238125] kernel_init+0x12/0x162 [ 60.242268] ret_from_fork+0x24/0x30 [ 60.246498] [ 60.246498] -> #3 (cpu_hotplug_lock.rw_sem){++++}: [ 60.252994] lock_acquire+0x16f/0x430 [ 60.257316] cpus_read_lock+0x3d/0xc0 [ 60.261615] static_key_slow_inc+0x13/0x30 [ 60.266347] tracepoint_probe_register_prio+0x4d6/0x6d0 [ 60.272206] tracepoint_probe_register+0x2b/0x40 [ 60.277473] trace_event_reg+0x277/0x330 [ 60.282048] perf_trace_init+0x449/0xaa0 [ 60.286605] perf_tp_event_init+0x7d/0xf0 [ 60.291312] perf_try_init_event+0x164/0x200 [ 60.296218] perf_event_alloc.part.0+0xd48/0x2530 [ 60.301573] SYSC_perf_event_open+0xa2d/0x24b0 [ 60.306654] SyS_perf_event_open+0x34/0x40 [ 60.311391] do_syscall_64+0x1e8/0x640 [ 60.315781] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.321464] [ 60.321464] -> #2 (tracepoints_mutex){+.+.}: [ 60.327344] lock_acquire+0x16f/0x430 [ 60.331658] __mutex_lock+0xe8/0x1470 [ 60.335971] mutex_lock_nested+0x16/0x20 [ 60.340549] tracepoint_probe_register_prio+0x36/0x6d0 [ 60.346322] tracepoint_probe_register+0x2b/0x40 [ 60.351599] trace_event_reg+0x277/0x330 [ 60.356165] perf_trace_init+0x449/0xaa0 [ 60.360726] perf_tp_event_init+0x7d/0xf0 [ 60.365408] perf_try_init_event+0x164/0x200 [ 60.370369] perf_event_alloc.part.0+0xd48/0x2530 [ 60.375719] SYSC_perf_event_open+0xa2d/0x24b0 [ 60.380798] SyS_perf_event_open+0x34/0x40 [ 60.385528] do_syscall_64+0x1e8/0x640 [ 60.390009] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.395702] [ 60.395702] -> #1 (event_mutex){+.+.}: [ 60.401053] lock_acquire+0x16f/0x430 [ 60.405366] __mutex_lock+0xe8/0x1470 [ 60.409695] mutex_lock_nested+0x16/0x20 [ 60.414278] perf_trace_init+0x58/0xaa0 [ 60.418754] perf_tp_event_init+0x7d/0xf0 [ 60.423487] perf_try_init_event+0xe6/0x200 [ 60.428323] perf_event_alloc.part.0+0xd48/0x2530 [ 60.433767] SYSC_perf_event_open+0xa2d/0x24b0 [ 60.438847] SyS_perf_event_open+0x34/0x40 [ 60.443579] do_syscall_64+0x1e8/0x640 [ 60.447966] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.453650] [ 60.453650] -> #0 (&cpuctx_mutex/1){+.+.}: [ 60.459380] __lock_acquire+0x2c89/0x45e0 [ 60.464040] lock_acquire+0x16f/0x430 [ 60.468338] __mutex_lock+0xe8/0x1470 [ 60.472655] mutex_lock_nested+0x16/0x20 [ 60.477217] SYSC_perf_event_open+0x121f/0x24b0 [ 60.482387] SyS_perf_event_open+0x34/0x40 [ 60.487121] do_syscall_64+0x1e8/0x640 [ 60.491632] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.497337] [ 60.497337] other info that might help us debug this: [ 60.497337] [ 60.505458] Chain exists of: [ 60.505458] &cpuctx_mutex/1 --> pmus_lock --> &cpuctx_mutex [ 60.505458] [ 60.515675] Possible unsafe locking scenario: [ 60.515675] [ 60.521815] CPU0 CPU1 [ 60.526459] ---- ---- [ 60.531104] lock(&cpuctx_mutex); [ 60.534620] lock(pmus_lock); [ 60.540324] lock(&cpuctx_mutex); [ 60.548236] lock(&cpuctx_mutex/1); [ 60.551976] [ 60.551976] *** DEADLOCK *** [ 60.551976] [ 60.558035] 1 lock held by syz-executor584/7164: [ 60.562854] #0: (&cpuctx_mutex){+.+.}, at: [] SYSC_perf_event_open+0x1212/0x24b0 [ 60.572265] [ 60.572265] stack backtrace: [ 60.576743] CPU: 0 PID: 7164 Comm: syz-executor584 Not tainted 4.14.125 #19 [ 60.583826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.593179] Call Trace: [ 60.595751] dump_stack+0x138/0x19c [ 60.599361] print_circular_bug.isra.0.cold+0x1cc/0x28f [ 60.604712] __lock_acquire+0x2c89/0x45e0 [ 60.608838] ? trace_hardirqs_on+0x10/0x10 [ 60.613053] lock_acquire+0x16f/0x430 [ 60.616852] ? SYSC_perf_event_open+0x121f/0x24b0 [ 60.621672] ? SYSC_perf_event_open+0x121f/0x24b0 [ 60.626493] __mutex_lock+0xe8/0x1470 [ 60.630272] ? SYSC_perf_event_open+0x121f/0x24b0 [ 60.635090] ? lockdep_init_map+0x9/0x10 [ 60.639130] ? debug_mutex_init+0x2d/0x5a [ 60.643273] ? SYSC_perf_event_open+0x121f/0x24b0 [ 60.648193] ? __mutex_init+0xd3/0x110 [ 60.652062] ? mutex_trylock+0x1c0/0x1c0 [ 60.656109] ? find_held_lock+0x35/0x130 [ 60.660166] ? SYSC_perf_event_open+0x11b4/0x24b0 [ 60.664990] ? lock_downgrade+0x6e0/0x6e0 [ 60.669119] mutex_lock_nested+0x16/0x20 [ 60.673181] ? mutex_lock_nested+0x16/0x20 [ 60.677406] SYSC_perf_event_open+0x121f/0x24b0 [ 60.682075] ? perf_event_set_output+0x460/0x460 [ 60.686815] ? lock_downgrade+0x6e0/0x6e0 [ 60.690943] SyS_perf_event_open+0x34/0x40 [ 60.695180] ? perf_bp_event+0x170/0x170 [ 60.699222] do_syscall_64+0x1e8/0x640 [ 60.703090] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 60.707919] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.713089] RIP: 0033:0x440579 [ 60.716275] RSP: 002b:00007ffde2bf1288 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 60.723963] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440579 [ 60.731228] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000200 [ 60.738476] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 60.745725] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401e00 [ 60.752973] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000