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mx.google.com; spf=pass (google.com: domain of miles.chen@mediatek.com designates 210.61.82.183 as permitted sender) smtp.mailfrom=miles.chen@mediatek.com Received: from mailgw01.mediatek.com ([210.61.82.183]) by mx.google.com with ESMTPS id e69si11679964pfg.137.2019.01.21.01.38.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Jan 2019 01:38:23 -0800 (PST) Received-SPF: pass (google.com: domain of miles.chen@mediatek.com designates 210.61.82.183 as permitted sender) client-ip=210.61.82.183; Authentication-Results: mx.google.com; spf=pass (google.com: domain of miles.chen@mediatek.com designates 210.61.82.183 as permitted sender) smtp.mailfrom=miles.chen@mediatek.com X-UUID: e39555a8435f4724bbf3fb08b876d1b3-20190121 X-UUID: e39555a8435f4724bbf3fb08b876d1b3-20190121 Received: from mtkexhb01.mediatek.inc [(172.21.101.102)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1215981584; Mon, 21 Jan 2019 17:38:14 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 21 Jan 2019 17:38:12 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Mon, 21 Jan 2019 17:38:12 +0800 From: To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton CC: , , , Miles Chen Subject: [PATCH] mm/slub: use WARN_ON() for some slab errors Date: Mon, 21 Jan 2019 17:38:10 +0800 Message-ID: <1548063490-545-1-git-send-email-miles.chen@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-TM-SNTS-SMTP: 22854B56D5FA26CFEBB0D7CFF0AD17A8FEB7B10791F002CBBB518968530C57542000:8 X-MTK: N X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP From: Miles Chen When debugging with slub.c, sometimes we have to trigger a panic in order to get the coredump file. To do that, we have to modify slub.c and rebuild kernel. To make debugging easier, use WARN_ON() for these slab errors so we can dump stack trace by default or set panic_on_warn to trigger a panic. Signed-off-by: Miles Chen --- mm/slub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 1e3d0ec4e200..e48c3bb30c93 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -684,7 +684,7 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) print_section(KERN_ERR, "Padding ", p + off, size_from_object(s) - off); - dump_stack(); + WARN_ON(1); } void object_err(struct kmem_cache *s, struct page *page, @@ -705,7 +705,7 @@ static __printf(3, 4) void slab_err(struct kmem_cache *s, struct page *page, va_end(args); slab_bug(s, "%s", buf); print_page_info(page); - dump_stack(); + WARN_ON(1); } static void init_object(struct kmem_cache *s, void *object, u8 val) @@ -1690,7 +1690,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) flags &= ~GFP_SLAB_BUG_MASK; pr_warn("Unexpected gfp: %#x (%pGg). Fixing up to gfp: %#x (%pGg). Fix your code!\n", invalid_mask, &invalid_mask, flags, &flags); - dump_stack(); + WARN_ON(1); } return allocate_slab(s,