Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A8C926A1AF for ; Mon, 15 Jun 2026 03:52:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781495536; cv=none; b=Id07JfRXENzC5HBD9W3yr1rthrH6Xp0TKtgCfTTtcey/CwA3mjvcc42UR4Jx4TPxLHkZXTNV9z6UPCrp54BVMC2shiBV5AuX00yDoy4PdzYEuk9OBJNJZlXzjnNPVPCRIGhA48s28qlXed4J314XTkSFRZ8ubTQXs8+BiCLT3Os= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781495536; c=relaxed/simple; bh=Xq7yJbnvaC5wDvUPLvFK+dFj/Bvjh++yx232yl3KQGA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=DD/4+Gnwu/onBcXMKVObZQYhjgJD4zVDV+QizKOLR3JKLjZpnsstHTftsuqXO29rXufDHJTsvZvLnpVMkR608OMIGMZVD8DM3ypMphL5wr60xJ9XtUlI2VIpX79KJ410F4ihiWkl9qn6cvE8LHJ77WmCk7sZLdf+OrzuKDZZGQY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ut34AfAE; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Ut34AfAE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C4001F000E9; Mon, 15 Jun 2026 03:52:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781495535; bh=WiTyI1dJ2PaY/HdRlPty+jeVZNcR/+rm63CXPW+lf1g=; h=Subject:To:Cc:From:Date; b=Ut34AfAETaoaPqM/ah16nyMwdoiI+YxIoTFVDshFQV8iWyMbDRKQjqvQ5Gdlht6+0 /aBZfrAEvF5vKJGrdgHo5MCnLktCldBEMgDp0B13H8uVnxLIujsHDIlG4mWb9KXTq2 ftgltTzazcH1z4iGNFv3jv54o5ONoB7FhhtJv+Fg= Subject: FAILED: patch "[PATCH] mm/memory-failure: fix hugetlb_lock AA deadlock in" failed to apply to 6.12-stable tree To: mawupeng1@huawei.com,akpm@linux-foundation.org,david@kernel.org,liam.howlett@oracle.com,linmiaohe@huawei.com,ljs@kernel.org,mhocko@suse.com,muchun.song@linux.dev,nao.horiguchi@gmail.com,osalvador@kernel.org,rppt@kernel.org,stable@vger.kernel.org,surenb@google.com,vbabka@kernel.org,wangkefeng.wang@huawei.com Cc: From: Date: Mon, 15 Jun 2026 05:51:13 +0200 Message-ID: <2026061513-catalog-deviant-3f62@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x 3c2d42b8ee345b17a4ba56b0f6492d1ff4c1178e # git commit -s git send-email --to '' --in-reply-to '2026061513-catalog-deviant-3f62@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 3c2d42b8ee345b17a4ba56b0f6492d1ff4c1178e Mon Sep 17 00:00:00 2001 From: Wupeng Ma Date: Fri, 22 May 2026 09:03:05 +0800 Subject: [PATCH] mm/memory-failure: fix hugetlb_lock AA deadlock in get_huge_page_for_hwpoison Two concurrent madvise(MADV_HWPOISON) calls on the same hugetlb page can trigger a recursive spinlock self-deadlock (AA deadlock) on hugetlb_lock when racing with a concurrent unmap: thread#0 thread#1 -------- -------- madvise(folio, MADV_HWPOISON) -> poisons the folio successfully madvise(folio, MADV_HWPOISON) unmap(folio) try_memory_failure_hugetlb get_huge_page_for_hwpoison spin_lock_irq(&hugetlb_lock) <- held __get_huge_page_for_hwpoison hugetlb_update_hwpoison() -> MF_HUGETLB_FOLIO_PRE_POISONED goto out: folio_put() refcount: 1 -> 0 free_huge_folio() spin_lock_irqsave(&hugetlb_lock) -> AA DEADLOCK! The out: path in __get_huge_page_for_hwpoison() calls folio_put() to drop the GUP reference while the hugetlb_lock is still held by the hugetlb.c wrapper get_huge_page_for_hwpoison(). If concurrent unmap has released the page table mapping reference, folio_put() drops the folio refcount to zero, triggering free_huge_folio() which attempts to re-acquire the non-recursive hugetlb_lock. Fix this by moving hugetlb_lock acquisition from the hugetlb.c wrapper into get_huge_page_for_hwpoison(). Place spin_unlock_irq() before the folio_put() at the out: label so the folio is always released outside the lock. [akpm@linux-foundation.org: fix race, rename label per Miaohe] Link: https://sashiko.dev/#/patchset/20260522010305.4099834-1-mawupeng1@huawei.com Link: https://lore.kernel.org/f39f405e-4b4b-8f79-70fe-a2b5b62114eb@huawei.com Link: https://lore.kernel.org/20260522010305.4099834-1-mawupeng1@huawei.com Fixes: 405ce051236c ("mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()") Signed-off-by: Wupeng Ma Acked-by: Oscar Salvador (SUSE) Acked-by: Muchun Song Reviewed-by: Kefeng Wang Acked-by: Miaohe Lin Cc: David Hildenbrand Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Signed-off-by: Andrew Morton diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 5957bc25efa8..2abaf99321e9 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -153,8 +153,6 @@ long hugetlb_unreserve_pages(struct inode *inode, long start, long end, long freed); bool folio_isolate_hugetlb(struct folio *folio, struct list_head *list); int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison); -int get_huge_page_for_hwpoison(unsigned long pfn, int flags, - bool *migratable_cleared); void folio_putback_hugetlb(struct folio *folio); void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason); void hugetlb_fix_reserve_counts(struct inode *inode); @@ -421,12 +419,6 @@ static inline int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, return 0; } -static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags, - bool *migratable_cleared) -{ - return 0; -} - static inline void folio_putback_hugetlb(struct folio *folio) { } diff --git a/include/linux/mm.h b/include/linux/mm.h index 06bbe9eba636..fc2acedf0b76 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4975,8 +4975,6 @@ extern int soft_offline_page(unsigned long pfn, int flags); */ extern const struct attribute_group memory_failure_attr_group; extern void memory_failure_queue(unsigned long pfn, int flags); -extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, - bool *migratable_cleared); void num_poisoned_pages_inc(unsigned long pfn); void num_poisoned_pages_sub(unsigned long pfn, long i); #else @@ -4984,12 +4982,6 @@ static inline void memory_failure_queue(unsigned long pfn, int flags) { } -static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, - bool *migratable_cleared) -{ - return 0; -} - static inline void num_poisoned_pages_inc(unsigned long pfn) { } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 1b1d4f87a3a4..c921287489de 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -7161,17 +7161,6 @@ int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison return ret; } -int get_huge_page_for_hwpoison(unsigned long pfn, int flags, - bool *migratable_cleared) -{ - int ret; - - spin_lock_irq(&hugetlb_lock); - ret = __get_huge_page_for_hwpoison(pfn, flags, migratable_cleared); - spin_unlock_irq(&hugetlb_lock); - return ret; -} - /** * folio_putback_hugetlb - unisolate a hugetlb folio * @folio: the isolated hugetlb folio diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ee42d4361309..d47aef256a32 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1966,20 +1966,19 @@ void folio_clear_hugetlb_hwpoison(struct folio *folio) folio_free_raw_hwp(folio, true); } -/* - * Called from hugetlb code with hugetlb_lock held. - */ -int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, +static int get_huge_page_for_hwpoison(unsigned long pfn, int flags, bool *migratable_cleared) { struct page *page = pfn_to_page(pfn); - struct folio *folio = page_folio(page); + struct folio *folio; bool count_increased = false; int ret, rc; + spin_lock_irq(&hugetlb_lock); + folio = page_folio(page); if (!folio_test_hugetlb(folio)) { ret = MF_HUGETLB_NON_HUGEPAGE; - goto out; + goto out_unlock; } else if (flags & MF_COUNT_INCREASED) { ret = MF_HUGETLB_IN_USED; count_increased = true; @@ -1995,13 +1994,13 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, } else { ret = MF_HUGETLB_RETRY; if (!(flags & MF_NO_RETRY)) - goto out; + goto out_unlock; } rc = hugetlb_update_hwpoison(folio, page); if (rc >= MF_HUGETLB_FOLIO_PRE_POISONED) { ret = rc; - goto out; + goto out_unlock; } /* @@ -2013,8 +2012,10 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, *migratable_cleared = true; } + spin_unlock_irq(&hugetlb_lock); return ret; -out: +out_unlock: + spin_unlock_irq(&hugetlb_lock); if (count_increased) folio_put(folio); return ret;