PANIC: remove page 0x82c39a70 from cache 0xdef6cc30: page still has mappings!

Welcome to Kernel Debugging Land...
Thread 10 "low resource manager" running on CPU 0
kdebug> bt
stack trace for thread 10 "low resource manager"
    kernel stack: 0x80fab000 to 0x80faf000
frame               caller     <image>:function + offset
 0 80fae90c (+  32) 8006de75   <kernel_x86> invoke_command_trampoline(void*: 0x80fae98c) + 0x0015
 1 80fae92c (+  12) 800e06d8   <kernel_x86>:arch_debug_call_with_fault_handler + 0x001b
 2 80fae938 (+  48) 8006bcb2   <kernel_x86>:debug_call_with_fault_handler + 0x0051
 3 80fae968 (+  64) 8006e21e   <kernel_x86>:invoke_debugger_command + 0x00bb
 4 80fae9a8 (+  48) 8006e33b   <kernel_x86> invoke_pipe_segment(debugger_command_pipe*: 0x80133622, int32: 0, char*: NULL) + 0x0083
 5 80fae9d8 (+  32) 8006e403   <kernel_x86>:invoke_debugger_command_pipe + 0x008b
 6 80fae9f8 (+ 128) 800721a2   <kernel_x86> ExpressionParser<0x80faeac8>::_ParseCommandPipe(int&: 0x80faeac4) + 0x0aae
 7 80faea78 (+  48) 8007496b   <kernel_x86> ExpressionParser<0x80faeac8>::EvaluateCommand(char const*: 0x80133620 "bt", int&: 0x80faeac4) + 0x06df
 8 80faeaa8 (+ 192) 80074ae4   <kernel_x86>:evaluate_debug_command + 0x0084
 9 80faeb68 (+  96) 8006ca85   <kernel_x86> kernel_debugger_internal(char const*: 0xdef6cc30 "®$Ä", int32: -2131039244) + 0x039a
10 80faebc8 (+  16) 8006cbdb   <kernel_x86>:kernel_debugger + 0x0019
11 80faebd8 (+ 160) 8006ccb5   <kernel_x86>:panic + 0x002a
12 80faec78 (+  80) 800d4679   <kernel_x86> VMCache<0xdef6cc30>::Delete() + 0x0085
13 80faecc8 (+  64) 800d3abd   <kernel_x86> VMCache<0xdef6cc30>::Unlock(false) + 0x0137
14 80faed08 (+  48) 800c5334   <kernel_x86> delete_area(VMAddressSpace*: 0x1147280, VMArea*: NULL, false) + 0x01ae
15 80faed38 (+  32) 800c5408   <kernel_x86>:vm_delete_area + 0x0055
16 80faed58 (+  32) 800c544e   <kernel_x86>:delete_area + 0x0018
17 80faed78 (+  48) 800bca99   <kernel_x86> MemoryManager<0xe2800000>::_FreeArea(MemoryManager::Area*: NULL, false, uint32: 0x8004b6d2) + 0x02a9
18 80faeda8 (+  64) 800bcc75   <kernel_x86> MemoryManager<0xe2800000>::_FreeChunk(MemoryManager::Area*: 0xe2800cd8, MemoryManager::MetaChunk*: 0xe2800cf4, MemoryManager::Chunk*: 0xe2b00000, uint32: 0x0 (0), false, uint32: 0x80faee38) + 0x01a5
19 80faede8 (+  80) 800bcf04   <kernel_x86> MemoryManager<0xe2b00000>::Free(void*: NULL, uint32: 0x80faee68) + 0x0172
20 80faee38 (+  48) 800bacc2   <kernel_x86> HashedObjectCache<0x8109fa10>::ReturnSlab(slab*: 0x810b8d00, uint32: 0x0 (0)) + 0x00a8
21 80faee68 (+  32) 800be136   <kernel_x86> ObjectCache<0x8109fa10>::ReturnObjectToSlab(slab*: 0x810b8d00, void*: 0xe2b47000, uint32: 0x0 (0)) + 0x00f2
22 80faee88 (+  64) 800bf374   <kernel_x86>:object_cache_free + 0x005d
23 80faeec8 (+  32) 8003b46c   <kernel_x86> block_cache<0x8182c300>::Free(void*: 0xe2b47000) + 0x001e
24 80faeee8 (+  32) 8003b4bf   <kernel_x86> block_cache<0x8182c300>::FreeBlock(cached_block*: 0xd902e480) + 0x004d
25 80faef08 (+  32) 8003b4fb   <kernel_x86> block_cache<0x8182c300>::RemoveBlock(cached_block*: 0xd902e480) + 0x0021
26 80faef28 (+  48) 8003c6df   <kernel_x86> block_cache<0x8182c300>::RemoveUnusedBlocks(int32: 2147483647, int32: 2147483647) + 0x00d9
27 80faef58 (+  48) 8003c7b0   <kernel_x86> block_cache<0x8182c300>::_LowMemoryHandler(void*: 0x2, uint32: 0x3 (3), int32: -2147169219) + 0x00bc
28 80faef88 (+  80) 8004cef0   <kernel_x86> low_resource_manager(void*: NULL) + 0x0317
29 80faefd8 (+  32) 80060980   <kernel_x86> _create_kernel_thread_kentry() + 0x0015
30 80faeff8 (+2131038216) 80064f23   <kernel_x86> thread_kthread_exit() + 0x0000