====================================================== WARNING: possible circular locking dependency detected 5.15.0-rc2-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/15152 is trying to acquire lock: ffffffff8c9a7c10 (dup_mmap_sem){++++}-{0:0}, at: register_for_each_vma+0x32/0xc50 kernel/events/uprobes.c:1041 but task is already holding lock: ffff88807d694c90 (&uprobe->register_rwsem){+.+.}-{3:3}, at: __uprobe_register+0x4fd/0x860 kernel/events/uprobes.c:1178 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&uprobe->register_rwsem){+.+.}-{3:3}: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 down_write+0x97/0x170 kernel/locking/rwsem.c:1517 __uprobe_register+0x4fd/0x860 kernel/events/uprobes.c:1178 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x399/0xbd0 kernel/trace/trace_uprobe.c:1134 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x49b/0x950 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x138/0x1a0 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xfe/0x180 kernel/events/core.c:9886 perf_try_init_event+0x13e/0x3d0 kernel/events/core.c:11193 perf_init_event kernel/events/core.c:11257 [inline] perf_event_alloc+0x1155/0x2c10 kernel/events/core.c:11548 __do_sys_perf_event_open kernel/events/core.c:12069 [inline] __se_sys_perf_event_open+0x7b2/0x4280 kernel/events/core.c:11961 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (event_mutex){+.+.}-{3:3}: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1df/0x2550 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 perf_trace_destroy+0x27/0xb0 kernel/trace/trace_event_perf.c:241 _free_event+0x874/0xe50 kernel/events/core.c:4958 put_event kernel/events/core.c:5052 [inline] perf_mmap_close+0x8dd/0xde0 kernel/events/core.c:6111 remove_vma mm/mmap.c:184 [inline] remove_vma_list mm/mmap.c:2629 [inline] __do_munmap+0x1c2f/0x1e80 mm/mmap.c:2887 do_munmap mm/mmap.c:2895 [inline] munmap_vma_range mm/mmap.c:603 [inline] mmap_region+0x9e8/0x1b60 mm/mmap.c:1742 do_mmap+0x88b/0xf30 mm/mmap.c:1575 vm_mmap_pgoff+0x1e5/0x2f0 mm/util.c:519 ksys_mmap_pgoff+0x4a4/0x740 mm/mmap.c:1624 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&mm->mmap_lock#2){++++}-{3:3}: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 down_write_killable+0xaa/0x1b0 kernel/locking/rwsem.c:1528 mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] dup_mmap+0xde/0xfd0 kernel/fork.c:499 dup_mm+0x8c/0x310 kernel/fork.c:1453 copy_mm kernel/fork.c:1505 [inline] copy_process+0x28d7/0x5c80 kernel/fork.c:2194 kernel_clone+0x230/0x7d0 kernel/fork.c:2584 __do_sys_clone kernel/fork.c:2701 [inline] __se_sys_clone kernel/fork.c:2685 [inline] __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2685 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (dup_mmap_sem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain+0x1dfb/0x8240 kernel/locking/lockdep.c:3789 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5015 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 percpu_down_write+0x52/0x2f0 kernel/locking/percpu-rwsem.c:217 register_for_each_vma+0x32/0xc50 kernel/events/uprobes.c:1041 __uprobe_register+0x5d4/0x860 kernel/events/uprobes.c:1182 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x399/0xbd0 kernel/trace/trace_uprobe.c:1134 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x49b/0x950 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x138/0x1a0 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xfe/0x180 kernel/events/core.c:9886 perf_try_init_event+0x13e/0x3d0 kernel/events/core.c:11193 perf_init_event kernel/events/core.c:11257 [inline] perf_event_alloc+0x1155/0x2c10 kernel/events/core.c:11548 __do_sys_perf_event_open kernel/events/core.c:12069 [inline] __se_sys_perf_event_open+0x7b2/0x4280 kernel/events/core.c:11961 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: dup_mmap_sem --> event_mutex --> &uprobe->register_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&uprobe->register_rwsem); lock(event_mutex); lock(&uprobe->register_rwsem); lock(dup_mmap_sem); *** DEADLOCK *** 3 locks held by syz-executor.5/15152: #0: ffffffff90984d78 (&pmus_srcu){....}-{0:0}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:267 #1: ffffffff8c96a3c8 (event_mutex){+.+.}-{3:3}, at: perf_uprobe_init+0x12d/0x1a0 kernel/trace/trace_event_perf.c:335 #2: ffff88807d694c90 (&uprobe->register_rwsem){+.+.}-{3:3}, at: __uprobe_register+0x4fd/0x860 kernel/events/uprobes.c:1178 stack backtrace: CPU: 1 PID: 15152 Comm: syz-executor.5 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain+0x1dfb/0x8240 kernel/locking/lockdep.c:3789 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5015 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 percpu_down_write+0x52/0x2f0 kernel/locking/percpu-rwsem.c:217 register_for_each_vma+0x32/0xc50 kernel/events/uprobes.c:1041 __uprobe_register+0x5d4/0x860 kernel/events/uprobes.c:1182 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x399/0xbd0 kernel/trace/trace_uprobe.c:1134 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x49b/0x950 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x138/0x1a0 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xfe/0x180 kernel/events/core.c:9886 perf_try_init_event+0x13e/0x3d0 kernel/events/core.c:11193 perf_init_event kernel/events/core.c:11257 [inline] perf_event_alloc+0x1155/0x2c10 kernel/events/core.c:11548 __do_sys_perf_event_open kernel/events/core.c:12069 [inline] __se_sys_perf_event_open+0x7b2/0x4280 kernel/events/core.c:11961 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7a6e6c4709 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7a6bbf9188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f7a6e7c90e0 RCX: 00007f7a6e6c4709 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000180 RBP: 00007f7a6e71ecb4 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2403e64f R14: 00007f7a6bbf9300 R15: 0000000000022000