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Jianpeng Chang 0849560e52 arm64: kdump: Fix elfcorehdr overlap caused by reserved memory processing reorder 
[ Upstream commit 3e8ade58b7 ]

Commit 8a6e02d0c0 ("of: reserved_mem: Restructure how the reserved
memory regions are processed") changed the processing order of reserved
memory regions, causing elfcorehdr to overlap with dynamically allocated
reserved memory regions during kdump kernel boot.

The issue occurs because:
1. kexec-tools allocates elfcorehdr in the last crashkernel reserved
   memory region and passes it to the second kernel
2. The problematic commit moved dynamic reserved memory allocation
   (like bman-fbpr) to occur during fdt_scan_reserved_mem(), before
   elfcorehdr reservation in fdt_reserve_elfcorehdr()
3. bman-fbpr with 16MB alignment requirement can get allocated at
   addresses that overlap with the elfcorehdr location
4. When fdt_reserve_elfcorehdr() tries to reserve elfcorehdr memory,
   overlap detection identifies the conflict and skips reservation
5. kdump kernel fails with "Unable to handle kernel paging request"
   because elfcorehdr memory is not properly reserved

The boot log:
Before 8a6e02d0c0:
  OF: fdt: Reserving 1 KiB of memory at 0xf4fff000 for elfcorehdr
  OF: reserved mem: 0xf3000000..0xf3ffffff bman-fbpr

After 8a6e02d0c0:
  OF: reserved mem: 0xf4000000..0xf4ffffff bman-fbpr
  OF: fdt: elfcorehdr is overlapped

Fix this by ensuring elfcorehdr reservation occurs before dynamic
reserved memory allocation.

Fixes: 8a6e02d0c0 ("of: reserved_mem: Restructure how the reserved memory regions are processed")
Signed-off-by: Jianpeng Chang <jianpeng.chang.cn@windriver.com>
Link: https://patch.msgid.link/20251205015934.700016-1-jianpeng.chang.cn@windriver.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-08 10:14:05 +01:00
arch x86/xen: Fix sparse warning in enlighten_pv.c 2026-01-08 10:14:05 +01:00
block block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock 2025-12-18 13:55:21 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id 2025-12-18 13:54:47 +01:00
Documentation docs: hwmon: fix link to g762 devicetree binding 2025-12-18 13:55:20 +01:00
drivers arm64: kdump: Fix elfcorehdr overlap caused by reserved memory processing reorder 2026-01-08 10:14:05 +01:00
fs gfs2: Fix use of bio_chain 2026-01-08 10:13:59 +01:00
include shmem: fix recovery on rename failures 2026-01-08 10:13:54 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/napi: fix io_napi_entry RCU accesses 2025-11-24 10:36:06 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel livepatch: Match old_sympos 0 and 1 in klp_find_func() 2026-01-08 10:13:56 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2025-12-18 13:54:57 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm shmem: fix recovery on rename failures 2026-01-08 10:13:54 +01:00
net net/handshake: duplicate handshake cancellations leak socket 2026-01-08 10:14:03 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples: work around glibc redefining some of our defines wrong 2025-12-12 18:37:21 +01:00
scripts kbuild: Use objtree for module signing key path 2026-01-08 10:13:56 +01:00
security ima: Handle error code returned by ima_filter_rule_match() 2025-12-18 13:55:04 +01:00
sound ASoC: codecs: nau8325: Silence uninitialized variables warnings 2025-12-18 13:55:23 +01:00
tools iommufd/selftest: Make it clearer to gcc that the access is not out of bounds 2026-01-08 10:14:02 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-24 10:36:06 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.63 2025-12-18 13:55:23 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.