====================================================== WARNING: possible circular locking dependency detected 4.14.198-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/11062 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_read_group kernel/events/core.c:4541 [inline] (&event->child_mutex){+.+.}, at: [] __perf_read kernel/events/core.c:4623 [inline] (&event->child_mutex){+.+.}, at: [] perf_read+0x2a2/0x7c0 kernel/events/core.c:4638 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&cpuctx_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_event_init_cpu+0xb7/0x170 kernel/events/core.c:11249 perf_event_init+0x2cc/0x308 kernel/events/core.c:11296 start_kernel+0x46a/0x770 init/main.c:620 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #4 (pmus_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11243 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:572 [inline] _cpu_up+0x219/0x500 kernel/cpu.c:1140 do_cpu_up+0x9a/0x160 kernel/cpu.c:1175 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x3f4/0x619 init/main.c:1068 kernel_init+0xd/0x15b init/main.c:1000 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #3 (cpu_hotplug_lock.rw_sem){++++}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x39/0xc0 kernel/cpu.c:295 static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123 tracepoint_add_func+0x517/0x750 kernel/tracepoint.c:223 tracepoint_probe_register_prio kernel/tracepoint.c:283 [inline] tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:304 trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x424/0xa30 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8132 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9368 perf_init_event kernel/events/core.c:9406 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9666 perf_event_alloc kernel/events/core.c:10019 [inline] SYSC_perf_event_open kernel/events/core.c:10123 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10009 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (tracepoints_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 tracepoint_probe_register_prio kernel/tracepoint.c:279 [inline] tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:304 trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x424/0xa30 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8132 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9368 perf_init_event kernel/events/core.c:9406 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9666 perf_event_alloc kernel/events/core.c:10019 [inline] SYSC_perf_event_open kernel/events/core.c:10123 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10009 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (event_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234 _free_event+0x321/0xe20 kernel/events/core.c:4243 free_event+0x32/0x40 kernel/events/core.c:4270 perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4414 perf_release+0x33/0x40 kernel/events/core.c:4440 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&event->child_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_read_group kernel/events/core.c:4541 [inline] __perf_read kernel/events/core.c:4623 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4638 __vfs_read+0xe4/0x620 fs/read_write.c:411 vfs_read+0x139/0x340 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xf2/0x210 fs/read_write.c:567 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &event->child_mutex --> pmus_lock --> &cpuctx_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex); lock(pmus_lock); lock(&cpuctx_mutex); lock(&event->child_mutex); *** DEADLOCK *** 1 lock held by syz-executor.3/11062: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240 stack backtrace: CPU: 0 PID: 11062 Comm: syz-executor.3 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_read_group kernel/events/core.c:4541 [inline] __perf_read kernel/events/core.c:4623 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4638 __vfs_read+0xe4/0x620 fs/read_write.c:411 vfs_read+0x139/0x340 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xf2/0x210 fs/read_write.c:567 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45de59 RSP: 002b:00007f7c609d9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000026500 RCX: 000000000045de59 RDX: 00000000000005e3 RSI: 0000000020003140 RDI: 0000000000000005 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffff143dc3f R14: 00007f7c609da9c0 R15: 000000000118bf2c usb usb7: usbfs: process 11091 (syz-executor.0) did not claim interface 0 before use usb usb7: usbfs: process 11111 (syz-executor.0) did not claim interface 0 before use Unknown ioctl 21508 Unknown ioctl 44544 IPVS: ftp: loaded support on port[0] = 21 Unknown ioctl 44544 Unknown ioctl 21508 libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' usb usb7: usbfs: process 11135 (syz-executor.0) did not claim interface 0 before use *** Guest State *** usb usb7: usbfs: process 11167 (syz-executor.0) did not claim interface 0 before use CR0: actual=0x0000000000000030, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. CR3 = 0x00000000fffbc000 RSP = 0x00000080000000f7 RIP = 0x0000000000000000 RFLAGS=0x00008602 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0xf000, attr=0x0009b, limit=0x0000ffff, base=0x00000000ffff0000 DS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 IPVS: ftp: loaded support on port[0] = 21 GDTR: limit=0x0000ffff, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000 IDTR: limit=0x0000ffff, base=0x0000000000000000 TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff8116622e RSP = 0xffff88804c6a79c8 libceph: resolve '6d' (ret=-3): failed CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f4f80d05700 GSBase=ffff8880aea00000 TRBase=fffffe0000003000 GDTBase=fffffe0000001000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=000000004d8ef000 CR4=00000000001426f0 Sysenter RSP=fffffe0000003000 CS:RIP=0010:ffffffff866018c0 EFER = 0x0000000000000d01 PAT = 0x0407050600070106 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000e2 EntryControls=0000d1ff ExitControls=002fefff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 usb usb7: usbfs: process 11235 (syz-executor.0) did not claim interface 0 before use IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xfffffea143a57699 EPT pointer = 0x000000002f3ee01e Virtual processor ID = 0x0001 *** Guest State *** CR0: actual=0x0000000000000030, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x00000080000000f7 RIP = 0x0000000000000000 RFLAGS=0x00008602 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0xf000, attr=0x0009b, limit=0x0000ffff, base=0x00000000ffff0000 DS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GDTR: limit=0x0000ffff, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000 IDTR: limit=0x0000ffff, base=0x0000000000000000 TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff8116622e RSP = 0xffff88804fbff9c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f4f80ce3700 GSBase=ffff8880aea00000 TRBase=fffffe0000003000 GDTBase=fffffe0000001000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=000000004d8ef000 CR4=00000000001426f0 Sysenter RSP=fffffe0000003000 CS:RIP=0010:ffffffff866018c0 EFER = 0x0000000000000d01 PAT = 0x0407050600070106 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000e2 EntryControls=0000d1ff ExitControls=002fefff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xfffffea143a57699 EPT pointer = 0x000000002f3ee01e Virtual processor ID = 0x0001 libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' libceph: parse_ips bad ip '6d' libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' usb usb7: usbfs: process 11259 (syz-executor.0) did not claim interface 0 before use ceph: device name is missing path (no : separator in 6d:ÝQu!*s^ŒsA/„ÔT¯\¿òQ¸Ä5hÜÑ/â‚¥Û;mD¶ó²Š^) ceph: device name is missing path (no : separator in 6d:ÝQu!*s^ŒsA/„ÔT¯\¿òQ¸Ä5hÜÑ/â‚¥Û;mD¶ó²Š^) libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' libceph: resolve '6d' (ret=-3): failed libceph: parse_ips bad ip '6d' libceph: resolve '6d' (ret=-3): failed usb usb7: usbfs: process 11361 (syz-executor.0) did not claim interface 0 before use libceph: parse_ips bad ip '6d' usb usb7: usbfs: process 11425 (syz-executor.0) did not claim interface 0 before use usb usb7: usbfs: process 11428 (syz-executor.0) did not claim interface 0 before use