From: sashiko-bot@kernel.org
To: "Wandun Chen" <chenwandun1@gmail.com>,
robh@kernel.org, baoquan.he@linux.dev, rppt@kernel.org,
m.szyprowski@samsung.com
Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com,
chenhuacai@kernel.org, kernel@xen0n.name, pjw@kernel.org,
palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr,
tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
saravanak@kernel.org, akpm@linux-foundation.org,
pasha.tatashin@soleen.com, pratyush@kernel.org,
ruirui.yang@linux.dev, robin.murphy@arm.com,
kexec@lists.infradead.org
Subject: Re: [RESEND PATCH v8 3/8] crash_core: serialize crash header preparation against hotplug
Date: Fri, 16 Oct 2026 06:33:52 +0000 [thread overview]
Message-ID: <sashiko-outbox-173869@kernel.org> (raw)
In-Reply-To: <20261016061549.4181390-4-chenwandun1@gmail.com>
> From: Wandun Chen <chenwandun@lixiang.com>
>
> crash_prepare_headers() counts memory ranges before populating the
> allocated crash_mem array. The weak implementation used by ARM64,
> RISC-V and LoongArch walks memblock.memory, while x86 performs the same
> two-pass operation over system RAM resources. Concurrent memory hotplug
> can change range source between the two walks and make the populate
> pass overflow cmem->ranges.
>
> Take device_hotplug_lock when preparing crash headers during
> kexec_file_load(). The x86/riscv memory hotplug path already takes
> device_hotplug_lock, so call __crash_prepare_headers() directly
> to avoid recursive locking.
>
> Sashiko reported this issue in [1].
>
> Fixes: 3751e728cef2 ("arm64: kexec_file: add crash dump support")
> Fixes: 1bcca8620a91 ("LoongArch: Add crash dump support for kexec_file")
> Fixes: 8acea455fafa ("RISC-V: Support for kexec_file on panic")
> Fixes: dd5f726076cc ("kexec: support for kexec on panic using new system call")
> Signed-off-by: Wandun Chen <chenwandun@lixiang.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261016061549.4181390-1-chenwandun1@gmail.com?part=3
next prev parent reply other threads:[~2026-10-16 6:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-16 6:15 [RESEND PATCH v8 0/8] kdump: reduce vmcore size and capture time Wandun Chen
2026-10-16 6:15 ` [RESEND PATCH v8 1/8] riscv: build crash_mem ranges from memblock instead of resource tree Wandun Chen
2026-10-16 6:28 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 2/8] crash_core: fold duplicated memblock arch hooks into the weak default Wandun Chen
2026-10-16 6:30 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 3/8] crash_core: serialize crash header preparation against hotplug Wandun Chen
2026-10-16 6:33 ` sashiko-bot [this message]
2026-10-16 6:15 ` [RESEND PATCH v8 4/8] crash_core: replace for_each_mem_range() with for_each_mem_region() Wandun Chen
2026-10-16 6:29 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 5/8] memblock: introduce MEMBLOCK_NODUMP flag Wandun Chen
2026-10-16 6:26 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 6/8] of: reserved_mem: add dumpable flag to opt-in vmcore Wandun Chen
2026-10-16 6:24 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 7/8] of: reserved_mem: mark /reserved-memory entries with MEMBLOCK_NODUMP Wandun Chen
2026-10-16 6:32 ` sashiko-bot
2026-10-16 6:15 ` [RESEND PATCH v8 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header Wandun Chen
2026-10-16 6:25 ` sashiko-bot
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