====================================================== WARNING: possible circular locking dependency detected 5.6.0-rc3-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor374/8758 is trying to acquire lock: ffffffff892c9f18 (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec+0x14/0x90 kernel/jump_label.c:254 but task is already holding lock: ffff88808438c7d8 (&mm->mmap_sem#2){++++}, at: vm_mmap_pgoff+0xf6/0x1d0 mm/util.c:504 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_sem#2){++++}: lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 down_write+0x57/0x140 kernel/locking/rwsem.c:1534 mpol_rebind_mm+0x37/0x210 mm/mempolicy.c:382 cpuset_attach+0x35f/0x4c0 kernel/cgroup/cpuset.c:2203 cgroup_migrate_execute+0x7ac/0xff0 kernel/cgroup/cgroup.c:2445 cgroup_migrate+0x181/0x190 kernel/cgroup/cgroup.c:2701 cgroup_attach_task+0x786/0xa10 kernel/cgroup/cgroup.c:2738 __cgroup1_procs_write+0x257/0x390 kernel/cgroup/cgroup-v1.c:521 cgroup1_procs_write+0x2a/0x40 kernel/cgroup/cgroup-v1.c:534 cgroup_file_write+0x223/0x5f0 kernel/cgroup/cgroup.c:3695 kernfs_fop_write+0x3f0/0x4f0 fs/kernfs/file.c:315 __vfs_write+0xb8/0x740 fs/read_write.c:494 vfs_write+0x270/0x580 fs/read_write.c:558 ksys_write+0x117/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:620 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&cpuset_rwsem){++++}: lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 percpu_down_read include/linux/percpu-rwsem.h:40 [inline] cpuset_read_lock+0x3e/0x130 kernel/cgroup/cpuset.c:340 __sched_setscheduler+0x624/0x1b00 kernel/sched/core.c:4869 _sched_setscheduler kernel/sched/core.c:5041 [inline] sched_setscheduler_nocheck+0x125/0x240 kernel/sched/core.c:5087 __kthread_create_on_node+0x2eb/0x3b0 kernel/kthread.c:349 kthread_create_on_node+0x72/0xa0 kernel/kthread.c:388 create_worker+0x396/0x890 kernel/workqueue.c:1924 workqueue_prepare_cpu+0x98/0x110 kernel/workqueue.c:5024 cpuhp_invoke_callback+0x4c9/0x8b0 kernel/cpu.c:172 cpuhp_up_callbacks kernel/cpu.c:599 [inline] _cpu_up+0x307/0x550 kernel/cpu.c:1165 do_cpu_up+0x159/0x1a0 kernel/cpu.c:1200 cpu_up+0x18/0x20 kernel/cpu.c:1208 smp_init+0x107/0x29a kernel/smp.c:604 kernel_init_freeable+0x2f2/0x429 init/main.c:1432 kernel_init+0x11/0x290 init/main.c:1346 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 -> #0 (cpu_hotplug_lock.rw_sem){++++}: check_prev_add kernel/locking/lockdep.c:2475 [inline] check_prevs_add kernel/locking/lockdep.c:2580 [inline] validate_chain+0x1507/0x7be0 kernel/locking/lockdep.c:2970 __lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 percpu_down_read include/linux/percpu-rwsem.h:40 [inline] cpus_read_lock+0x3e/0x130 kernel/cpu.c:292 __static_key_slow_dec+0x14/0x90 kernel/jump_label.c:254 static_key_slow_dec+0x50/0xa0 kernel/jump_label.c:270 sw_perf_event_destroy+0x78/0x170 kernel/events/core.c:8840 _free_event+0x825/0xdc0 kernel/events/core.c:4616 put_event kernel/events/core.c:4710 [inline] perf_mmap_close+0xc04/0xea0 kernel/events/core.c:5754 remove_vma mm/mmap.c:177 [inline] remove_vma_list mm/mmap.c:2568 [inline] __do_munmap+0x1006/0x14b0 mm/mmap.c:2812 do_munmap mm/mmap.c:2820 [inline] mmap_region+0x8c8/0x1c40 mm/mmap.c:1713 do_mmap+0xa8f/0x1100 mm/mmap.c:1543 do_mmap_pgoff include/linux/mm.h:2334 [inline] vm_mmap_pgoff+0x13d/0x1d0 mm/util.c:506 ksys_mmap_pgoff+0x45b/0x540 mm/mmap.c:1593 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:90 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: cpu_hotplug_lock.rw_sem --> &cpuset_rwsem --> &mm->mmap_sem#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_sem#2); lock(&cpuset_rwsem); lock(&mm->mmap_sem#2); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor374/8758: #0: ffff88808438c7d8 (&mm->mmap_sem#2){++++}, at: vm_mmap_pgoff+0xf6/0x1d0 mm/util.c:504 stack backtrace: CPU: 1 PID: 8758 Comm: syz-executor374 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 print_circular_bug+0xc3f/0xe70 kernel/locking/lockdep.c:1684 check_noncircular+0x206/0x3a0 kernel/locking/lockdep.c:1808 check_prev_add kernel/locking/lockdep.c:2475 [inline] check_prevs_add kernel/locking/lockdep.c:2580 [inline] validate_chain+0x1507/0x7be0 kernel/locking/lockdep.c:2970 __lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 percpu_down_read include/linux/percpu-rwsem.h:40 [inline] cpus_read_lock+0x3e/0x130 kernel/cpu.c:292 __static_key_slow_dec+0x14/0x90 kernel/jump_label.c:254 static_key_slow_dec+0x50/0xa0 kernel/jump_label.c:270 sw_perf_event_destroy+0x78/0x170 kernel/events/core.c:8840 _free_event+0x825/0xdc0 kernel/events/core.c:4616 put_event kernel/events/core.c:4710 [inline] perf_mmap_close+0xc04/0xea0 kernel/events/core.c:5754 remove_vma mm/mmap.c:177 [inline] remove_vma_list mm/mmap.c:2568 [inline] __do_munmap+0x1006/0x14b0 mm/mmap.c:2812 do_munmap mm/mmap.c:2820 [inline] mmap_region+0x8c8/0x1c40 mm/mmap.c:1713 do_mmap+0xa8f/0x1100 mm/mmap.c:1543 do_mmap_pgoff include/linux/mm.h:2334 [inline] vm_mmap_pgoff+0x13d/0x1d0 mm/util.c:506 ksys_mmap_pgoff+0x45b/0x540 mm/mmap.c:1593 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:90 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4473b9 Code: e8 4c bb 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0272a71da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dcc38 RCX: 00000000004473b9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 00000000006dcc30 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 00000000006dcc3c R13: 00007ffcae9c6f0f R14: 00007f0272a729c0 R15: 0000000000000000