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Catalin Marinas c15cdea517 mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign() 
Commit b035f5a6d8 ("mm: slab: reduce the kmalloc() minimum alignment
if DMA bouncing possible") allows architectures with non-coherent DMA to
define a small ARCH_KMALLOC_MINALIGN (e.g. sizeof(unsigned long long))
and this has been enabled on arm64. With KASAN_HW_TAGS enabled, however,
ARCH_SLAB_MINALIGN becomes 16 on arm64 (arch_slab_minalign() dynamically
selects it since commit d949a8155d ("mm: make minimum slab alignment a
runtime property")). This can lead to a situation where kmalloc-8 caches
are attempted to be created with a kmem_caches.size aligned to 16. When
the cache is mergeable, it can lead to kernel warnings like:

sysfs: cannot create duplicate filename '/kernel/slab/:d-0000016'
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc1-00001-gda98843cd306-dirty #5
Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
Call trace:
 dump_backtrace+0x90/0xe8
 show_stack+0x18/0x24
 dump_stack_lvl+0x48/0x60
 dump_stack+0x18/0x24
 sysfs_warn_dup+0x64/0x80
 sysfs_create_dir_ns+0xe8/0x108
 kobject_add_internal+0x98/0x264
 kobject_init_and_add+0x8c/0xd8
 sysfs_slab_add+0x12c/0x248
 slab_sysfs_init+0x98/0x14c
 do_one_initcall+0x6c/0x1b0
 kernel_init_freeable+0x1c0/0x288
 kernel_init+0x24/0x1e0
 ret_from_fork+0x10/0x20
kobject: kobject_add_internal failed for :d-0000016 with -EEXIST, don't try to register things with the same name in the same directory.
SLUB: Unable to add boot slab dma-kmalloc-8 to sysfs

Limit the __kmalloc_minalign() return value (used to create the
kmalloc-* caches) to arch_slab_minalign() so that kmalloc-8 caches are
skipped when KASAN_HW_TAGS is enabled (both config and runtime).

Reported-by: Mark Rutland <mark.rutland@arm.com>
Fixes: b035f5a6d8 ("mm: slab: reduce the kmalloc() minimum alignment if DMA bouncing possible")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: stable@vger.kernel.org # 6.5.x
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
2023-10-11 15:24:49 +02:00
arch Misc fixes: 2023-10-08 09:27:20 -07:00
block
certs
crypto
Documentation Devicetree fixes for v6.6, part 2: 2023-10-07 10:05:16 -07:00
drivers - Fix memory leak when freeing dm zoned target device 2023-10-07 10:17:48 -07:00
fs Six SMB3 server fixes 2023-10-08 10:10:52 -07:00
include
init
io_uring
ipc
kernel Misc fixes: 2023-10-08 09:57:59 -07:00
lib
LICENSES
mm mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign() 2023-10-11 15:24:49 +02:00
net
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samples
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MAINTAINERS - Fix memory leak when freeing dm zoned target device 2023-10-07 10:17:48 -07:00
Makefile Linux 6.6-rc5 2023-10-08 13:49:43 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.