Public bug reported:
memory leak on Spark which is visible right after boot:
root@localhost:/sys/kernel/debug# cat kmemleak
unreferenced object 0xffff40ec0430e760 (size 32):
comm "swapper/0", pid 1, jiffies 4294667675
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc f1da05aa):
kmemleak_alloc+0xe4/0x128
__kmalloc_noprof+0x2b0/0x4b8
acpi_ut_initialize_buffer+0xbc/0x108
acpi_evaluate_object+0x31c/0x368
acpi_evaluate_dsm+0xc0/0x170
pci_acpi_preserve_config+0x88/0xf8
pci_register_host_bridge+0x2dc/0x5a8
pci_create_root_bus+0x90/0xe8
acpi_pci_root_create+0x174/0x2d0
pci_acpi_scan_root+0x198/0x2d0
acpi_pci_root_add+0x1a0/0x370
acpi_bus_attach+0x1f4/0x378
acpi_dev_for_one_check+0x54/0x80
device_for_each_child+0x70/0xe8
acpi_dev_for_each_child+0x4c/0xa0
acpi_bus_attach+0x26c/0x378
Upstream fix was introduced with https://lore.kernel.org/linux-
pci/20250825223731.GA808746@bhelgaas/T/#t
While working on it, I also realized we are missing:
1f2768b6a3ee7 PCI: Fix reference leak in pci_alloc_child_bus()
804443c1f2788 PCI: Fix reference leak in pci_register_host_bridge()
We should have above as well
** Affects: linux-nvidia-6.14 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2121450
Title:
backport: "ACPI/PCI: Fix memory leak fix in pci_acpi_preserve_config"
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