====================================================== WARNING: possible circular locking dependency detected 5.14.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor391/8677 is trying to acquire lock: ffffffff8b9ed108 (event_mutex){+.+.}-{3:3}, at: perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 but task is already holding lock: ffff8880172642e8 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff8880172642e8 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x290 mm/util.c:517 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&mm->mmap_lock#2){++++}-{3:3}: down_write_killable+0x95/0x170 kernel/locking/rwsem.c:1417 mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] dup_mmap kernel/fork.c:484 [inline] dup_mm+0x12e/0x1380 kernel/fork.c:1379 copy_mm kernel/fork.c:1431 [inline] copy_process+0x71ec/0x74d0 kernel/fork.c:2119 kernel_clone+0xe7/0xac0 kernel/fork.c:2509 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (dup_mmap_sem){++++}-{0:0}: percpu_down_write+0x4f/0x3e0 kernel/locking/percpu-rwsem.c:217 register_for_each_vma+0x2c/0xc10 kernel/events/uprobes.c:1041 __uprobe_register+0x5c2/0x850 kernel/events/uprobes.c:1182 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x357/0x9f0 kernel/trace/trace_uprobe.c:1134 trace_uprobe_register+0x443/0x880 kernel/trace/trace_uprobe.c:1461 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x549/0xa20 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x16f/0x210 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xff/0x1c0 kernel/events/core.c:9875 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11192 perf_init_event kernel/events/core.c:11256 [inline] perf_event_alloc.part.0+0xf16/0x3b10 kernel/events/core.c:11547 perf_event_alloc kernel/events/core.c:11970 [inline] __do_sys_perf_event_open+0x4ae/0x3130 kernel/events/core.c:12068 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&uprobe->register_rwsem){+.+.}-{3:3}: down_write+0x92/0x150 kernel/locking/rwsem.c:1406 __uprobe_register+0x531/0x850 kernel/events/uprobes.c:1178 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x357/0x9f0 kernel/trace/trace_uprobe.c:1134 trace_uprobe_register+0x443/0x880 kernel/trace/trace_uprobe.c:1461 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x549/0xa20 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x16f/0x210 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xff/0x1c0 kernel/events/core.c:9875 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11192 perf_init_event kernel/events/core.c:11256 [inline] perf_event_alloc.part.0+0xf16/0x3b10 kernel/events/core.c:11547 perf_event_alloc kernel/events/core.c:11970 [inline] __do_sys_perf_event_open+0x4ae/0x3130 kernel/events/core.c:12068 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (event_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __mutex_lock_common kernel/locking/mutex.c:959 [inline] __mutex_lock+0x12a/0x10a0 kernel/locking/mutex.c:1104 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 _free_event+0x2ee/0x1390 kernel/events/core.c:4959 put_event kernel/events/core.c:5053 [inline] perf_mmap_close+0x540/0xe30 kernel/events/core.c:6098 remove_vma+0xae/0x170 mm/mmap.c:186 remove_vma_list mm/mmap.c:2656 [inline] __do_munmap+0x715/0x11c0 mm/mmap.c:2914 do_munmap mm/mmap.c:2922 [inline] munmap_vma_range mm/mmap.c:604 [inline] mmap_region+0x85a/0x1760 mm/mmap.c:1753 do_mmap+0x86e/0x1180 mm/mmap.c:1584 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519 ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1635 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: event_mutex --> dup_mmap_sem --> &mm->mmap_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock#2); lock(dup_mmap_sem); lock(&mm->mmap_lock#2); lock(event_mutex); *** DEADLOCK *** 1 lock held by syz-executor391/8677: #0: ffff8880172642e8 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff8880172642e8 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x290 mm/util.c:517 stack backtrace: CPU: 0 PID: 8677 Comm: syz-executor391 Not tainted 5.14.0-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+0xcd/0x134 lib/dump_stack.c:105 check_noncircular+0x25f/0x2e0 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 kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __mutex_lock_common kernel/locking/mutex.c:959 [inline] __mutex_lock+0x12a/0x10a0 kernel/locking/mutex.c:1104 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 _free_event+0x2ee/0x1390 kernel/events/core.c:4959 put_event kernel/events/core.c:5053 [inline] perf_mmap_close+0x540/0xe30 kernel/events/core.c:6098 remove_vma+0xae/0x170 mm/mmap.c:186 remove_vma_list mm/mmap.c:2656 [inline] __do_munmap+0x715/0x11c0 mm/mmap.c:2914 do_munmap mm/mmap.c:2922 [inline] munmap_vma_range mm/mmap.c:604 [inline] mmap_region+0x85a/0x1760 mm/mmap.c:1753 do_mmap+0x86e/0x1180 mm/mmap.c:1584 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519 ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1635 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x453bf9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 90 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:00007f10392621f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000004d24e8 RCX: 0000000000453bf9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 00000000004d24e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 00000000004d24ec R13: 00007ffe172fb3ef R14: 00007f1039262300 R15: 0000000000022000