BUG: MAX_LOCKDEP_ENTRIES too low!
turning off the locking correctness validator.
CPU: 0 PID: 14439 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
 alloc_list_entry kernel/locking/lockdep.c:1353 [inline]
 add_lock_to_list.constprop.0.cold+0x11/0x18 kernel/locking/lockdep.c:1374
 check_prev_add kernel/locking/lockdep.c:3007 [inline]
 check_prevs_add kernel/locking/lockdep.c:3060 [inline]
 validate_chain kernel/locking/lockdep.c:3675 [inline]
 __lock_acquire+0x2f37/0x54c0 kernel/locking/lockdep.c:4901
 lock_acquire kernel/locking/lockdep.c:5511 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:354 [inline]
 pgd_dtor arch/x86/mm/pgtable.c:148 [inline]
 pgd_free+0x1e/0x1a0 arch/x86/mm/pgtable.c:474
 mm_free_pgd kernel/fork.c:632 [inline]
 __mmdrop+0xcb/0x400 kernel/fork.c:683
 mmdrop include/linux/sched/mm.h:49 [inline]
 finish_task_switch.isra.0+0x51b/0x810 kernel/sched/core.c:4218
 context_switch kernel/sched/core.c:4325 [inline]
 __schedule+0x919/0x21b0 kernel/sched/core.c:5073
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5233
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
 smp_call_function_single+0x419/0x4b0 kernel/smp.c:518
 task_function_call+0xd9/0x160 kernel/events/core.c:119
 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2902
 __do_sys_perf_event_open+0x1c18/0x2e60 kernel/events/core.c:12169
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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:00007f4b91c15188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665f9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffe52c18cbf R14: 00007f4b91c15300 R15: 0000000000022000