5c01a25a21
Marc Gonzalez reported the following kmemleak crash:
Unable to handle kernel paging request at virtual address ffffffc021e00000
Mem abort info:
ESR = 0x96000006
Exception class = DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
swapper pgtable: 4k pages, 39-bit VAs, pgdp = (____ptrval____) [ffffffc021e00000] pgd=000000017e3ba803, pud=000000017e3ba803, pmd=0000000000000000
Internal error: Oops: 96000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 6 PID: 523 Comm: kmemleak Tainted: G S W 5.0.0-rc1 #13
Hardware name: Qualcomm Technologies, Inc. MSM8998 v1 MTP (DT)
pstate: 80000085 (Nzcv daIf -PAN -UAO)
pc : scan_block+0x70/0x190
lr : scan_block+0x6c/0x190
Process kmemleak (pid: 523, stack limit = 0x(____ptrval____))
Call trace:
scan_block+0x70/0x190
scan_gray_list+0x108/0x1c0
kmemleak_scan+0x33c/0x7c0
kmemleak_scan_thread+0x98/0xf0
kthread+0x11c/0x120
ret_from_fork+0x10/0x1c
Code: f9000fb4 d503201f 97ffffd2 35000580 (f9400260)
The crash happens when a no-map area is allocated in
early_init_dt_alloc_reserved_memory_arch(). The allocated region is
registered with kmemleak, but it is then removed from memblock using
memblock_remove() that is not kmemleak-aware.
Replacing memblock_phys_alloc_range() with memblock_find_in_range()
makes sure that the allocated memory is not added to kmemleak and then
memblock_remove()'ing this memory is safe.
As a bonus, since memblock_find_in_range() ensures the allocation in the
specified range, the bounds check can be removed.
[rppt@linux.ibm.com: of: fix parameters order for call to memblock_find_in_range()]
Link: http://lkml.kernel.org/r/20190221112619.GC32004@rapoport-lnx
Link: http://lkml.kernel.org/r/20190213181921.GB15270@rapoport-lnx
Fixes: 3f0c820664 ("drivers: of: add initialization code for dynamic reserved memory")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Prateek Patel <prpatel@nvidia.com>
Tested-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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.