INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-next-kasan-gce-0,10.128.15.192' (ECDSA) to the list of known hosts. 2017/08/27 12:03:28 parsed 1 programs 2017/08/27 12:03:28 executed programs: 0 syzkaller login: [ 54.759835] [ 54.761462] ====================================================== [ 54.767742] WARNING: possible circular locking dependency detected [ 54.774020] 4.13.0-rc6-next-20170825+ #9 Not tainted [ 54.779085] ------------------------------------------------------ [ 54.785367] syz-executor0/3117 is trying to acquire lock: [ 54.790867] (event_mutex){+.+.}, at: [] perf_trace_destroy+0x28/0x100 [ 54.799070] [ 54.799070] but task is already holding lock: [ 54.805002] (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x198/0x280 [ 54.813026] [ 54.813026] which lock already depends on the new lock. [ 54.813026] [ 54.821302] [ 54.821302] the existing dependency chain (in reverse order) is: [ 54.828882] [ 54.828882] -> #7 (&mm->mmap_sem){++++}: [ 54.834404] __lock_acquire+0x3286/0x4620 [ 54.839037] lock_acquire+0x1d5/0x580 [ 54.843323] __might_fault+0x13a/0x1d0 [ 54.847692] _copy_to_user+0x2c/0xc0 [ 54.851890] filldir+0x1a7/0x320 [ 54.855742] dcache_readdir+0x12d/0x5e0 [ 54.860200] iterate_dir+0x4b2/0x5d0 [ 54.864394] SyS_getdents+0x225/0x450 [ 54.868677] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 54.873911] [ 54.873911] -> #6 (&sb->s_type->i_mutex_key#5){++++}: [ 54.880549] down_write+0x87/0x120 [ 54.884576] handle_create+0x30c/0x760 [ 54.888946] devtmpfsd+0x3eb/0x520 [ 54.892970] kthread+0x39c/0x470 [ 54.896821] ret_from_fork+0x2a/0x40 [ 54.901018] [ 54.901018] -> #5 ((complete)&req.done){+.+.}: [ 54.907047] __lock_acquire+0x3286/0x4620 [ 54.911679] lock_acquire+0x1d5/0x580 [ 54.915963] wait_for_completion+0xc8/0x770 [ 54.920769] devtmpfs_create_node+0x32b/0x4a0 [ 54.925747] device_add+0x120f/0x1640 [ 54.930029] device_create_groups_vargs+0x1f3/0x250 [ 54.935529] device_create+0xda/0x110 [ 54.939817] msr_device_create+0x26/0x40 [ 54.944365] cpuhp_invoke_callback+0x256/0x14d0 [ 54.949520] cpuhp_thread_fun+0x265/0x520 [ 54.954152] smpboot_thread_fn+0x489/0x850 [ 54.958866] kthread+0x39c/0x470 [ 54.962717] ret_from_fork+0x2a/0x40 [ 54.966930] [ 54.966930] -> #4 (cpuhp_state){+.+.}: [ 54.972264] __lock_acquire+0x3286/0x4620 [ 54.976892] lock_acquire+0x1d5/0x580 [ 54.981177] cpuhp_issue_call+0x1a2/0x3e0 [ 54.985809] __cpuhp_setup_state_cpuslocked+0x2e7/0x610 [ 54.991652] __cpuhp_setup_state+0xb0/0x140 [ 54.996459] page_writeback_init+0x4d/0x71 [ 55.001177] pagecache_init+0x48/0x4f [ 55.005472] start_kernel+0x71a/0x7ad [ 55.009763] x86_64_start_reservations+0x2a/0x2c [ 55.014999] x86_64_start_kernel+0x13c/0x149 [ 55.019892] verify_cpu+0x0/0xfb [ 55.023740] [ 55.023740] -> #3 (cpuhp_state_mutex){+.+.}: [ 55.029594] __lock_acquire+0x3286/0x4620 [ 55.034223] lock_acquire+0x1d5/0x580 [ 55.038513] __mutex_lock+0x16f/0x1870 [ 55.042879] mutex_lock_nested+0x16/0x20 [ 55.047421] __cpuhp_setup_state_cpuslocked+0x5b/0x610 [ 55.053179] __cpuhp_setup_state+0xb0/0x140 [ 55.057982] kvm_guest_init+0x1f3/0x20f [ 55.062441] setup_arch+0x1899/0x1ab3 [ 55.066722] start_kernel+0xa5/0x7ad [ 55.070920] x86_64_start_reservations+0x2a/0x2c [ 55.076198] x86_64_start_kernel+0x13c/0x149 [ 55.081089] verify_cpu+0x0/0xfb [ 55.084937] [ 55.084937] -> #2 (cpu_hotplug_lock.rw_sem){++++}: [ 55.091310] __lock_acquire+0x3286/0x4620 [ 55.095942] lock_acquire+0x1d5/0x580 [ 55.100224] cpus_read_lock+0x42/0x90 [ 55.104509] static_key_slow_inc+0x9d/0x3c0 [ 55.109314] tracepoint_probe_register_prio+0x80d/0x9a0 [ 55.115157] tracepoint_probe_register+0x2a/0x40 [ 55.120399] trace_event_reg+0x167/0x320 [ 55.124941] perf_trace_init+0x504/0xab0 [ 55.129484] perf_tp_event_init+0x7d/0xf0 [ 55.134111] perf_try_init_event+0xc9/0x1f0 [ 55.138913] perf_event_alloc+0x1c5b/0x2a00 [ 55.143714] SYSC_perf_event_open+0x7f3/0x2d90 [ 55.148780] SyS_perf_event_open+0x39/0x50 [ 55.153499] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 55.158734] [ 55.158734] -> #1 (tracepoints_mutex){+.+.}: [ 55.164587] __lock_acquire+0x3286/0x4620 [ 55.169218] lock_acquire+0x1d5/0x580 [ 55.173501] __mutex_lock+0x16f/0x1870 [ 55.177870] mutex_lock_nested+0x16/0x20 [ 55.182413] tracepoint_probe_register_prio+0xa0/0x9a0 [ 55.188170] tracepoint_probe_register+0x2a/0x40 [ 55.193429] trace_event_reg+0x167/0x320 [ 55.197973] perf_trace_init+0x504/0xab0 [ 55.202516] perf_tp_event_init+0x7d/0xf0 [ 55.207147] perf_try_init_event+0xc9/0x1f0 [ 55.211952] perf_event_alloc+0x1c5b/0x2a00 [ 55.216758] SYSC_perf_event_open+0x7f3/0x2d90 [ 55.221823] SyS_perf_event_open+0x39/0x50 [ 55.226540] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 55.231777] [ 55.231777] -> #0 (event_mutex){+.+.}: [ 55.237111] check_prev_add+0x865/0x1520 [ 55.241654] __lock_acquire+0x3286/0x4620 [ 55.246284] lock_acquire+0x1d5/0x580 [ 55.250565] __mutex_lock+0x16f/0x1870 [ 55.254935] mutex_lock_nested+0x16/0x20 [ 55.259479] perf_trace_destroy+0x28/0x100 [ 55.264198] tp_perf_event_destroy+0x15/0x20 [ 55.269089] _free_event+0x401/0x1130 [ 55.273374] put_event+0x24/0x30 [ 55.277226] perf_mmap_close+0x60d/0xf90 [ 55.281774] remove_vma+0xb4/0x1b0 [ 55.285796] do_munmap+0x82a/0xdf0 [ 55.289816] mmap_region+0x59e/0x15a0 [ 55.294100] do_mmap+0x6a1/0xd50 [ 55.297949] vm_mmap_pgoff+0x1de/0x280 [ 55.302320] SyS_mmap_pgoff+0x23b/0x5f0 [ 55.306780] SyS_mmap+0x16/0x20 [ 55.310541] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 55.315778] [ 55.315778] other info that might help us debug this: [ 55.315778] [ 55.323881] Chain exists of: [ 55.323881] event_mutex --> &sb->s_type->i_mutex_key#5 --> &mm->mmap_sem [ 55.323881] [ 55.335206] Possible unsafe locking scenario: [ 55.335206] [ 55.341225] CPU0 CPU1 [ 55.345939] ---- ---- [ 55.350565] lock(&mm->mmap_sem); [ 55.354066] lock(&sb->s_type->i_mutex_key#5); [ 55.361214] lock(&mm->mmap_sem); [ 55.367236] lock(event_mutex); [ 55.370564] [ 55.370564] *** DEADLOCK *** [ 55.370564] [ 55.376581] 1 lock held by syz-executor0/3117: [ 55.381121] #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x198/0x280 [ 55.389577] [ 55.389577] stack backtrace: [ 55.394045] CPU: 1 PID: 3117 Comm: syz-executor0 Not tainted 4.13.0-rc6-next-20170825+ #9 [ 55.402319] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.411635] Call Trace: [ 55.414195] dump_stack+0x194/0x257 [ 55.417802] ? arch_local_irq_restore+0x53/0x53 [ 55.422435] print_circular_bug+0x503/0x710 [ 55.426725] ? print_circular_bug_entry+0xb0/0xb0 [ 55.431534] ? __unwind_start+0x169/0x330 [ 55.435647] check_prev_add+0x865/0x1520 [ 55.439673] ? copy_trace+0x1d0/0x1d0 [ 55.443436] ? check_usage+0xb70/0xb70 [ 55.447290] ? hlock_class+0x140/0x140 [ 55.451137] ? copy_trace+0x1d0/0x1d0 [ 55.454901] __lock_acquire+0x3286/0x4620 [ 55.459012] ? __lock_acquire+0x3286/0x4620 [ 55.463295] ? copy_trace+0x1d0/0x1d0 [ 55.467060] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 55.472216] ? __unwind_start+0x169/0x330 [ 55.476326] ? unwind_get_return_address+0x61/0xa0 [ 55.481222] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 55.487070] ? do_munmap+0x82a/0xdf0 [ 55.490753] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 55.496599] ? lock_downgrade+0x990/0x990 [ 55.500710] ? mmap_region+0x59e/0x15a0 [ 55.504648] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 55.509624] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 55.514602] ? unwind_dump+0x4c0/0x4c0 [ 55.518458] ? unwind_dump+0x4c0/0x4c0 [ 55.522306] ? unwind_dump+0x4c0/0x4c0 [ 55.526156] ? __unwind_start+0x169/0x330 [ 55.530263] ? unwind_get_return_address+0x61/0xa0 [ 55.535152] ? __save_stack_trace+0x61/0xd0 [ 55.539437] ? check_noncircular+0x20/0x20 [ 55.543632] ? do_munmap+0x82a/0xdf0 [ 55.547308] ? save_stack_trace+0x16/0x20 [ 55.551420] ? __lock_acquire+0x20f4/0x4620 [ 55.555704] ? save_stack_trace+0x16/0x20 [ 55.559811] ? __lock_acquire+0x20f4/0x4620 [ 55.564100] lock_acquire+0x1d5/0x580 [ 55.567865] ? perf_trace_destroy+0x28/0x100 [ 55.572313] ? lock_release+0xd70/0xd70 [ 55.576251] ? check_same_owner+0x320/0x320 [ 55.580555] ? preempt_notifier_dec+0x20/0x20 [ 55.585015] ? rcu_note_context_switch+0x710/0x710 [ 55.589909] ? __might_sleep+0x95/0x190 [ 55.593844] ? perf_trace_destroy+0x28/0x100 [ 55.598215] __mutex_lock+0x16f/0x1870 [ 55.602065] ? perf_trace_destroy+0x28/0x100 [ 55.606436] ? __sched_text_start+0x8/0x8 [ 55.610545] ? perf_trace_destroy+0x28/0x100 [ 55.614917] ? mutex_lock_io_nested+0x1740/0x1740 [ 55.619724] ? lock_acquire+0x1d5/0x580 [ 55.623663] ? perf_mmap_close+0x5cb/0xf90 [ 55.627862] ? check_same_owner+0x320/0x320 [ 55.632155] ? check_noncircular+0x20/0x20 [ 55.636353] ? perf_mmap_close+0x33f/0xf90 [ 55.640550] ? check_noncircular+0x20/0x20 [ 55.644745] ? check_noncircular+0x20/0x20 [ 55.648941] ? print_usage_bug+0x480/0x480 [ 55.653145] ? __mutex_lock+0x16f/0x1870 [ 55.657171] ? perf_mmap_close+0x5cb/0xf90 [ 55.661370] ? print_usage_bug+0x480/0x480 [ 55.665569] ? find_held_lock+0x39/0x1d0 [ 55.669594] ? check_noncircular+0x20/0x20 [ 55.673790] ? perf_addr_filters_splice+0x18f/0x810 [ 55.678769] ? lock_downgrade+0x990/0x990 [ 55.683221] ? free_filters_list+0x2f0/0x2f0 [ 55.687593] ? __wake_up+0x1e/0x50 [ 55.691103] ? __lock_is_held+0xbc/0x140 [ 55.695127] mutex_lock_nested+0x16/0x20 [ 55.699150] ? mutex_lock_nested+0x16/0x20 [ 55.703345] perf_trace_destroy+0x28/0x100 [ 55.707541] ? perf_tp_event_init+0xf0/0xf0 [ 55.711822] tp_perf_event_destroy+0x15/0x20 [ 55.716195] _free_event+0x401/0x1130 [ 55.719964] ? ring_buffer_attach+0x830/0x830 [ 55.724424] ? wait_for_completion+0x770/0x770 [ 55.728970] ? ring_buffer_put+0x140/0x140 [ 55.733172] ? lock_release+0xd70/0xd70 [ 55.737111] ? atomic_dec_and_mutex_lock+0x112/0x150 [ 55.742180] ? atomic_dec_and_mutex_lock+0x112/0x150 [ 55.747261] put_event+0x24/0x30 [ 55.750592] perf_mmap_close+0x60d/0xf90 [ 55.754617] ? perf_compat_ioctl+0x70/0x70 [ 55.758821] ? save_stack_trace+0x16/0x20