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Mon, 21 Sep 2026 13:17:48 +0000 X-Mizu-Trace-ID: f052238703df67d5 X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Mon, 21 Sep 2026 21:17:21 +0800 Subject: [PATCH v2 1/3] mm/vmalloc: fix vmalloc_dump_obj address alignment for last-page lookups MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260921-vmalloc_dump_obj-v2-1-73fceb3ed1c8@linux.dev> References: <20260921-vmalloc_dump_obj-v2-0-73fceb3ed1c8@linux.dev> In-Reply-To: <20260921-vmalloc_dump_obj-v2-0-73fceb3ed1c8@linux.dev> To: Andrew Morton , Uladzislau Rezki , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Ye Liu X-Mailer: b4 0.14.3 X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 7EDE31C0006 X-Stat-Signature: 8hq3yaufqi1cr79iczxjcmwaj39hbrwa X-HE-Tag: 1789996669-212844 X-HE-Meta: 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 EMFJZiWE /1wDzHCwivG5E3rp229liHy3F6zueM4/U1Bzj6lZ0rnf+0qX9wC5KRDZV9zumZAuZpmzjoUB4GU3Rcv+cWKp+7ORb4kqyvhLvVxmqSmOhCPSIrrhC0UfLWOS6UrPecpL2jIUEGpwWy4zG2QqmsvcyvzSmOcrk4r0MW7VdkZUQR0sH1Z4xxljzA34+s0c4XePkpl0NxdsgPKvcW/F4gyF1wBTQWURXSutzkfrB1qUqPAiFE3z86EnIplSrLU/zRZzpc0bGB5Xew1xnBepuXRK4Sr//LDscwpu0OtLZ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu vmalloc_dump_obj() uses PAGE_ALIGN() to normalize the input address before looking it up in the per-node busy tree. PAGE_ALIGN() rounds up, which can push an address in the last page of a vmalloc allocation to va_end -- outside the [va_start, va_end) range that __find_vmap_area() searches. This causes the lookup to miss the VA and return false, degrading diagnostic output in OOM dumps and KASAN reports to the less informative "vmalloc memory" fallback. The upward alignment can also change the addr_to_node() mapping when the page boundary crosses a vmap zone boundary, causing the search to hit the wrong node entirely. Use PAGE_ALIGN_DOWN() instead, which rounds down to the page containing the address. This keeps the address within the VA range and preserves the correct node mapping. Signed-off-by: Ye Liu --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 859e6d2d57a3..df42d8a6f058 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -5277,7 +5277,7 @@ bool vmalloc_dump_obj(void *object) unsigned long addr; unsigned long nr_pages; - addr = PAGE_ALIGN((unsigned long) object); + addr = PAGE_ALIGN_DOWN((unsigned long) object); vn = addr_to_node(addr); if (!spin_trylock(&vn->busy.lock)) -- 2.25.1