kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing) [RPi CM4]

[Will Deacon]

[+kfence folks as kfence_alloc_pool() is starting the stacktrace]

On Mon, Aug 15, 2022 at 11:52:05AM +0200, Max Schulze wrote:
> Hello,
> 
> I get these messages when booting 5.19.0 on RaspberryPi CM4.
> 
> Full boot log is at https://pastebin.ubuntu.com/p/mVhgBwxqPj/
> 
> Anyone seen this? What can I do ?
> 
> Thanks,
> 
> Max
> 
> 
> [0.087630] kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> [0.087756] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-v8-0815+ #5
> [0.087836] Hardware name: Raspberry Pi Compute Module 4 Rev 1.0 (DT)
> [0.087901] Call trace:
> [0.087941]  dump_backtrace.part.0+0x1dc/0x1ec
> [0.088029]  show_stack+0x24/0x80
> [0.088089]  dump_stack_lvl+0x8c/0xb8
> [0.088161]  dump_stack+0x1c/0x38
> [0.088224]  create_object.isra.0+0x490/0x4b0
> [0.088298]  kmemleak_alloc+0x3c/0x50
> [0.088365]  kmem_cache_alloc+0x2f8/0x450
> [0.088435]  __proc_create+0x18c/0x400
> [0.088509]  proc_create_reg+0x54/0xd0
> [0.088569]  proc_create_seq_private+0x94/0x120
> [0.088634]  init_mm_internals+0x1d8/0x248
> [0.088704]  kernel_init_freeable+0x188/0x388
> [0.088776]  kernel_init+0x30/0x150
> [0.088837]  ret_from_fork+0x10/0x20
> [0.088903] kmemleak: Kernel memory leak detector disabled
> [0.088958] kmemleak: Object 0xffffff806e24d000 (size 2097152):
> [0.089021] kmemleak:   comm "swapper", pid 0, jiffies 4294892296
> [0.089085] kmemleak:   min_count = -1
> [0.089131] kmemleak:   count = 0
> [0.089174] kmemleak:   flags = 0x5
> [0.089219] kmemleak:   checksum = 0
> [0.089264] kmemleak:   backtrace:
> [0.089306]  kmemleak_alloc_phys+0x94/0xb0
> [0.089379]  memblock_alloc_range_nid+0x1c0/0x20c
> [0.089460]  memblock_alloc_internal+0x88/0x100
> [0.089532]  memblock_alloc_try_nid+0x148/0x1ac
> [0.089604]  kfence_alloc_pool+0x44/0x6c
> [0.089674]  mm_init+0x28/0x98
> [0.089733]  start_kernel+0x178/0x3e8
> [0.089797]  __primary_switched+0xc4/0xcc
> [0.090185] cblist_init_generic: Setting adjustable number of callback queues.
> 
> 
> early_memtest reports no problems, 
> 
> 
> [0.000000] Zone ranges:
> [0.000000]   DMA  [mem 0x0000000000000000-0x000000003fffffff]
> [0.000000]   DMA32[mem 0x0000000040000000-0x000000007fffffff]
> [0.000000]   Normal   empty
> [0.000000] Movable zone start for each node
> [0.000000] Early memory node ranges
> [0.000000]   node   0: [mem 0x0000000000000000-0x0000000037ffffff]
> [0.000000]   node   0: [mem 0x0000000040000000-0x000000007fffffff]
> [0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000007fffffff]
> 
> 
> The Address differs a bit across reboots, but callstack looks always the same, and "Object is always 0xffffff806e24d000 (size 2097152)" 
> 
> 
> Aug 15 03:42:44 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 03:50:37 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 03:50:37 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 06:58:14 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 07:04:01 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 07:04:01 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 07:27:40 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 07:36:10 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 07:41:57 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 07:47:43 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 07:53:29 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 07:59:18 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:05:06 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:13:00 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:21:47 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:27:36 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:33:23 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 08:39:13 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:45:03 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 08:50:51 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 08:56:40 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 09:02:27 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 09:08:16 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 09:23:45 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 09:32:34 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 09:38:23 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 09:44:09 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 09:49:55 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 09:55:40 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 10:01:27 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 10:07:19 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 10:15:13 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 10:24:00 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 10:28:56 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 10:34:44 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 10:42:45 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 10:51:32 kernel:kmemleak: Cannot insert 0xffffff806e24ff40 into the object search tree (overlaps existing)
> Aug 15 11:03:53 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)
> Aug 15 11:14:55 kernel:kmemleak: Cannot insert 0xffffff806e24f000 into the object search tree (overlaps existing)