====================================================== WARNING: possible circular locking dependency detected 5.12.0-rc8-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/16055 is trying to acquire lock: ffffffff8bfe2bc8 (event_mutex){+.+.}-{3:3}, at: perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 but task is already holding lock: ffff88801b887258 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff88801b887258 (&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:480 [inline] dup_mm+0x12e/0x1380 kernel/fork.c:1368 copy_mm kernel/fork.c:1424 [inline] copy_process+0x2bc8/0x71a0 kernel/fork.c:2113 kernel_clone+0xe7/0xab0 kernel/fork.c:2500 __do_sys_clone+0xc8/0x110 kernel/fork.c:2617 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (dup_mmap_sem){++++}-{0:0}: percpu_down_write+0x95/0x440 kernel/locking/percpu-rwsem.c:217 register_for_each_vma+0x2c/0xc10 kernel/events/uprobes.c:1040 __uprobe_register+0x5c2/0x850 kernel/events/uprobes.c:1181 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x357/0xa00 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:9754 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11071 perf_init_event kernel/events/core.c:11123 [inline] perf_event_alloc.part.0+0xe3b/0x3960 kernel/events/core.c:11403 perf_event_alloc kernel/events/core.c:11785 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11883 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 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:1177 trace_uprobe_enable kernel/trace/trace_uprobe.c:1065 [inline] probe_event_enable+0x357/0xa00 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:9754 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11071 perf_init_event kernel/events/core.c:11123 [inline] perf_event_alloc.part.0+0xe3b/0x3960 kernel/events/core.c:11403 perf_event_alloc kernel/events/core.c:11785 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11883 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (event_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:2937 [inline] check_prevs_add kernel/locking/lockdep.c:3060 [inline] validate_chain kernel/locking/lockdep.c:3675 [inline] __lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4901 lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 __mutex_lock_common kernel/locking/mutex.c:949 [inline] __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 _free_event+0x2ee/0x1380 kernel/events/core.c:4863 put_event kernel/events/core.c:4957 [inline] perf_mmap_close+0x572/0xe10 kernel/events/core.c:6002 remove_vma+0xae/0x170 mm/mmap.c:180 remove_vma_list mm/mmap.c:2653 [inline] __do_munmap+0x74f/0x11a0 mm/mmap.c:2909 do_munmap mm/mmap.c:2917 [inline] munmap_vma_range mm/mmap.c:598 [inline] mmap_region+0x85a/0x1730 mm/mmap.c:1750 do_mmap+0xcff/0x11d0 mm/mmap.c:1581 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519 ksys_mmap_pgoff+0x49c/0x620 mm/mmap.c:1632 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 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-executor.1/16055: #0: ffff88801b887258 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88801b887258 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x290 mm/util.c:517 stack backtrace: CPU: 2 PID: 16055 Comm: syz-executor.1 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2128 check_prev_add kernel/locking/lockdep.c:2937 [inline] check_prevs_add kernel/locking/lockdep.c:3060 [inline] validate_chain kernel/locking/lockdep.c:3675 [inline] __lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4901 lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 __mutex_lock_common kernel/locking/mutex.c:949 [inline] __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:241 _free_event+0x2ee/0x1380 kernel/events/core.c:4863 put_event kernel/events/core.c:4957 [inline] perf_mmap_close+0x572/0xe10 kernel/events/core.c:6002 remove_vma+0xae/0x170 mm/mmap.c:180 remove_vma_list mm/mmap.c:2653 [inline] __do_munmap+0x74f/0x11a0 mm/mmap.c:2909 do_munmap mm/mmap.c:2917 [inline] munmap_vma_range mm/mmap.c:598 [inline] mmap_region+0x85a/0x1730 mm/mmap.c:1750 do_mmap+0xcff/0x11d0 mm/mmap.c:1581 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519 ksys_mmap_pgoff+0x49c/0x620 mm/mmap.c:1632 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 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:00007eff7f246188 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 00000000004bf9fb R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff0b32a74f R14: 00007eff7f246300 R15: 0000000000022000