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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-48de0bd1838si12475666f8f.170.2026.10.14.10.11.16 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Oct 2026 10:11:16 -0700 (PDT) Received-SPF: pass (google.com: domain of khorenko@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b=fWyBAZmg; spf=pass (google.com: domain of khorenko@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=khorenko@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Message-Id:Content-Type:MIME-Version:Subject:Date :From; bh=ZEzdsfT/IfwmRDS5/wr7gtNbarSwKY6t220b0JCxyzM=; b=fWyBAZmgDrSSx2IkNk2 frifU708USgeIrR3EiXZaoWqesPjQMVYxyejoHYHBmPRqpV8LzdM+trdPl+Ti/eBX97BO5ujbyUeb /uI72p+H6+pdKhZPzFe2HiPDNIzKmiu7d70ooQq8bz+KHiWyMB/jbTyYCKo2qrG+oTu4Mu9qMcKBY ErjWO09WGiHIUWub+v5D/dq4DcmX0FC9hJaxs1e2+/BChHirtW3Cc44krtAhdVisyytg3ShdObtzR rdvENwE978nThIkXAHj2/hl66QP+ftSYd10Fp1nVfFip2BkK46c/WbS3xtKB5tDBGHQz5MDO+HrIu BJvWoZsURMK2J8g==; Received: from ch-demo-asa.virtuozzo.com ([130.117.225.8] helo=f0.sw.ru) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1xH2S7-0081J5-0T; Wed, 14 Oct 2026 19:11:15 +0200 From: Konstantin Khorenko Date: Wed, 14 Oct 2026 19:11:04 +0200 MIME-Version: 1.0 Message-Id: <20261014-b4-prep-khorenko-vstor-149847-2-doexec-pinned-memory-v1-1-36f1120f9b57@virtuozzo.com> References: <20261014-b4-prep-khorenko-vstor-149847-2-doexec-pinned-memory-v1-0-36f1120f9b57@virtuozzo.com> In-Reply-To: <20261014-b4-prep-khorenko-vstor-149847-2-doexec-pinned-memory-v1-0-36f1120f9b57@virtuozzo.com> To: Vasileios Almpanis , Andrey Drobyshev , Pavel Tikhomirov X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1818; i=khorenko@virtuozzo.com; h=from:subject:message-id; bh=C4EhrBZIMR+CKHSliSNQTS4rbXStp3FkrSbKph4PSCA=; b=owEBbQKS/ZANAwAKAVGWCkf5YVwqAcsmYgBqz7ev+6ovL0Slkvu1odgmc575KP6ArGlJQCByQ 4BRn6pjXX2JAjMEAAEKAB0WIQRWD23IPcXT0GO9CCxRlgpH+WFcKgUCas+3rwAKCRBRlgpH+WFc KqdwD/9NzI9rH0I86Wdl9uScJHimQ8Fe36VKAxU9jpRNMv/4MhU9UzHDqfDVFvewLidi8JJqRwC 3jzyC1uQgDGth7eIqUoZomUduNyggmSZ4h3258LaUIju6gfTmgJXbZET088L7fSR6DUofJpDe1D t9WKCqJQA0CXhnCD52/41rI2+Qg2AWXtDwbITEx4iRKImgfKlekE2p6vmnFFTNuSWDwPdJx2qph xE42BkPEyNRaLi2/HP7h7IT6fi/Z5wKWskEVukuiqaG7YG1CXprQsWnHweUlcAr6+j/HQ1eqHnD hnCUTwzF4EMZxa+gsfd7TpkLL4fP+3veihj3Uox9kQ1Owu2hddYf+pUF2lJbGIoLPyt2wxLLf6I FMAvH02JDlLLx3blWg7/iyBoyp+jZJs1iDeLTtNxlYnxYeMUoo8phWKHsnMJq9eWUsXHLfef28o Dzvy1hWoNuckraxRbNqCoKMfBRynrZsKp1CzeeyIGsC1xsGEnWXJMEim6xzl0dMXpJGWSaYZVkw 3OG8bK0RXkOmNoaH9g5VAUoetZl5Abj39XKqhGDa7fahg9qZK9XXgyGZmFExR6pNfuRRsQubJOE /adoWXnPXeNpDEzarY92vtKsVT1GY8Q6Jb7a1cpxHsv4CaZPzRfwFH3KRegYUgyBewNY8f+4Lo9 CIE1BE7RLl3Gnrg== X-Developer-Key: i=khorenko@virtuozzo.com; a=openpgp; fpr=560F6DC83DC5D3D063BD082C51960A47F9615C2A X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 1/8] oracle/mm: fix VM_BUG_ON hit when preserving memory X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org From: Anthony Yznaga copy_page_range_mt() is a stripped down version of copy_page_range(). Unlike copy_page_range(), it is called during exec with the mmap read lock held on the outgoing mm. Assert that the mmap lock is held, and hold the write on the write_protect_seq seqcount_t section. The latter is needed to avoid a VM_BUG_ON in folio_needs_cow_for_dma(). Orabug: 37588319 Signed-off-by: Anthony Yznaga Reviewed-by: Liam R. Howlett (cherry picked from commit b4c299d320c22ed30b03c7e665389c9870dd9bab) Taken from Oracle linux-uek branch uek8/u2. Applied cleanly. Same Orabug as 90339648df65 ("oracle/mm: fix vma iterator misconfiguration that triggers VM_WARN_ONs"), which we already have; this is the second half of that pair. Fixes: d674aa9506ea ("oracle/mm: use padata for copying page ranges in vma_dup()") https://virtuozzo.atlassian.net/browse/VSTOR-150231 Feature: oracle/mm: MADV_DOEXEC madvise() flag Assisted-by: LLM Signed-off-by: Konstantin Khorenko --- mm/memory.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index 5e414c68f3a9c..d4821379529bf 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1489,10 +1489,16 @@ int copy_page_range_mt(struct vm_area_struct *dst_vma, struct vm_area_struct *sr .min_chunk = max(1ul << 27, PMD_SIZE), .max_threads = 16, }; + int ret; BUG_ON(!(src_vma->vm_flags & VM_EXEC_KEEP)); - return padata_do_multithreaded(&job); + mmap_assert_locked(src_vma->vm_mm); + raw_write_seqcount_begin(&src_vma->vm_mm->write_protect_seq); + ret = padata_do_multithreaded(&job); + raw_write_seqcount_end(&src_vma->vm_mm->write_protect_seq); + + return ret; } #endif /* CONFIG_PADATA */ -- 2.43.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel