From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFBC023BF for ; Thu, 20 Oct 2022 07:44:46 +0000 (UTC) Received: by mail-pl1-f176.google.com with SMTP id k9so19127851pll.11 for ; Thu, 20 Oct 2022 00:44:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=31xLf1EgDc/7pNYCx0W1lRbF7B/2EJqpAJLAQFhU4pA=; b=hLZ4EDHn5e5XKZLeVGdrJAxjgo2nZdTH5hCZVq++yfNJpdyURRh6RvJVYPnshCuETM yzWst8Wr1L1rKs70jLRlXhn5/rW6rs6eHGj4cgRdm3N8hDycDu6O1nnAoxQJdXAHyXGj 9lvhJYF5QStHcFV1dpQAph1WG3XbUgDkrBie+PSgBxA5Qjg9BeeXtO/JPrxbu3llWV5Y J6Qr2uQeN5X05z2wvsLuDgAz41JRfA7SAAMBc8RQ/qfO/NC5xm2FdIEGPTxZlWzHaWk6 m7RMvWkJlz5vynYQ+il2NOTNduCoukyO91HcQ+NmgBqKY4iIaK3catuedAhdRLCMKhHi 08Tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=31xLf1EgDc/7pNYCx0W1lRbF7B/2EJqpAJLAQFhU4pA=; b=hDjckzhygS9dmYfsvu3SeOc62aQhoiAC+dyfxk8ALjyjX3vKcGoLDLGf1kRx9TN3rH +uQKuTBSgxaL99Xw9Zoe5mhwXxxnL5TbrR0E8DiekJy2j9D6WbyqunIlsjmyfk6ubdHa zzTUlT5IBPRZlZQbL/vNLXLi7ie0Ur2AnPc+TMCZgfwD04g8Yf6SUACJgO5vRvjJg5cR E9voihruXbDg6IJzkMQR6UJ7fRKJJy0LdAmIKh6ZvOr31roKXIWmhP22lwJUFbTwRmhY Zswjt0hP5BcWJy+arKFBP963Gdt1GabtbqKSjuusen9V0SlwCINs9rIWZLnClUZK+Dsp s2IA== X-Gm-Message-State: ACrzQf3RL3uBwzHwajh+Uea9aQZD5MzxcAPp9/LMVbEYJaevMohxvtU+ DVq0QWu5E7upJ3xhjTYMVm0= X-Google-Smtp-Source: AMsMyM7wVOs3/7Syx3s4A6kSKGsTiOR9rIICIzDAw8ID7n1gMa/+w8G6qbSELt1FYXzFqfVchbnDSA== X-Received: by 2002:a17:902:e845:b0:184:8078:be88 with SMTP id t5-20020a170902e84500b001848078be88mr12550001plg.99.1666251886432; Thu, 20 Oct 2022 00:44:46 -0700 (PDT) Received: from localhost.localdomain ([111.203.234.211]) by smtp.googlemail.com with ESMTPSA id m5-20020a17090a668500b002008d0e5cb5sm614278pjj.47.2022.10.20.00.44.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Oct 2022 00:44:46 -0700 (PDT) From: Jintao Yin To: phillip@squashfs.org.uk Cc: bagasdotme@gmail.com, hsinyi@chromium.org, linux-kernel@vger.kernel.org, marcmiltenberger@gmail.com, mirsad.todorovac@alu.unizg.hr, nicememory@gmail.com, regressions@leemhuis.info, regressions@lists.linux.dev, srw@sladewatkins.net Subject: Re: BISECT result: 6.0.0-RC kernels trigger Firefox snap bug with 6.0.0-rc3 through 6.0.0-rc7 Date: Thu, 20 Oct 2022 15:43:41 +0800 Message-Id: <20221020074341.1431-1-nicememory@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221018174157.1897-1-phillip@squashfs.org.uk> References: <20221018174157.1897-1-phillip@squashfs.org.uk> Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Ignore my before diff. I didn't notice the end_index caculation greater than file_end part. Use the following diff instead. This diff is based on Phillip's latest two patches and improves the logic to update the status of pages only if page actor touches them. Please help test and feedbacks are welcome. Thanks, Jintao diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c index e56510964b22..5efa2a9f9630 100644 --- a/fs/squashfs/file.c +++ b/fs/squashfs/file.c @@ -506,8 +506,9 @@ static int squashfs_readahead_fragment(struct page **page, squashfs_i(inode)->fragment_size); struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; unsigned int n, mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1; + int res = buffer->error; - if (buffer->error) + if (res) goto out; expected += squashfs_i(inode)->fragment_offset; @@ -529,7 +530,7 @@ static int squashfs_readahead_fragment(struct page **page, out: squashfs_cache_put(buffer); - return buffer->error; + return res; } static void squashfs_readahead(struct readahead_control *ractl) @@ -557,6 +558,7 @@ static void squashfs_readahead(struct readahead_control *ractl) int res, bsize; u64 block = 0; unsigned int expected; + int nr_used_pages; nr_pages = __readahead_batch(ractl, pages, max_pages); if (!nr_pages) @@ -593,18 +595,18 @@ static void squashfs_readahead(struct readahead_control *ractl) res = squashfs_read_data(inode->i_sb, block, bsize, NULL, actor); - squashfs_page_actor_free(actor); + nr_used_pages = squashfs_page_actor_free(actor); if (res == expected) { int bytes; /* Last page (if present) may have trailing bytes not filled */ bytes = res % PAGE_SIZE; - if (pages[nr_pages - 1]->index == file_end && bytes) - memzero_page(pages[nr_pages - 1], bytes, + if (index == file_end && bytes && nr_used_pages > 0) + memzero_page(pages[nr_used_pages - 1], bytes, PAGE_SIZE - bytes); - for (i = 0; i < nr_pages; i++) { + for (i = 0; i < nr_used_pages; i++) { flush_dcache_page(pages[i]); SetPageUptodate(pages[i]); } diff --git a/fs/squashfs/file_direct.c b/fs/squashfs/file_direct.c index f1ccad519e28..1bb0347f98b0 100644 --- a/fs/squashfs/file_direct.c +++ b/fs/squashfs/file_direct.c @@ -30,10 +30,9 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize, int mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1; int start_index = target_page->index & ~mask; int end_index = start_index | mask; - int i, n, pages, bytes, res = -ENOMEM; + int i, n, pages, used_pages, bytes, res = -ENOMEM; struct page **page; struct squashfs_page_actor *actor; - void *pageaddr; if (end_index > file_end) end_index = file_end; @@ -74,7 +73,7 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize, /* Decompress directly into the page cache buffers */ res = squashfs_read_data(inode->i_sb, block, bsize, NULL, actor); - squashfs_page_actor_free(actor); + used_pages = squashfs_page_actor_free(actor); if (res < 0) goto mark_errored; @@ -86,16 +85,18 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize, /* Last page (if present) may have trailing bytes not filled */ bytes = res % PAGE_SIZE; - if (page[pages - 1]->index == end_index && bytes) { - pageaddr = kmap_local_page(page[pages - 1]); - memset(pageaddr + bytes, 0, PAGE_SIZE - bytes); - kunmap_local(pageaddr); + if (used_pages > 0 && page[used_pages - 1]->index == end_index && + bytes) { + memzero_page(page[used_pages - 1], bytes, + PAGE_SIZE - bytes); } /* Mark pages as uptodate, unlock and release */ for (i = 0; i < pages; i++) { - flush_dcache_page(page[i]); - SetPageUptodate(page[i]); + if (i < used_pages) { + flush_dcache_page(page[i]); + SetPageUptodate(page[i]); + } unlock_page(page[i]); if (page[i] != target_page) put_page(page[i]); @@ -112,8 +113,10 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize, for (i = 0; i < pages; i++) { if (page[i] == NULL || page[i] == target_page) continue; - flush_dcache_page(page[i]); - SetPageError(page[i]); + if (i < used_pages) { + flush_dcache_page(page[i]); + SetPageError(page[i]); + } unlock_page(page[i]); put_page(page[i]); } diff --git a/fs/squashfs/page_actor.h b/fs/squashfs/page_actor.h index 95ffbb543d91..c2c5c3937ef9 100644 --- a/fs/squashfs/page_actor.h +++ b/fs/squashfs/page_actor.h @@ -29,10 +29,12 @@ extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer, extern struct squashfs_page_actor *squashfs_page_actor_init_special( struct squashfs_sb_info *msblk, struct page **page, int pages, int length); -static inline void squashfs_page_actor_free(struct squashfs_page_actor *actor) +static inline int squashfs_page_actor_free(struct squashfs_page_actor *actor) { + int res = actor->next_page; kfree(actor->tmp_buffer); kfree(actor); + return res; } static inline void *squashfs_first_page(struct squashfs_page_actor *actor) {