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[209.85.220.65]) by mx.google.com with SMTPS id a1sor4159867otk.120.2019.03.21.13.17.46 for (Google Transport Security); Thu, 21 Mar 2019 13:17:46 -0700 (PDT) Received-SPF: pass (google.com: domain of martin.blumenstingl@googlemail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@googlemail.com header.s=20161025 header.b=BOoXzi1T; spf=pass (google.com: domain of martin.blumenstingl@googlemail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=martin.blumenstingl@googlemail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=googlemail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=/wxyUvtToomdZ+5Q9o+FQ/M8e4o6ylXXt1G7gXDkthY=; b=BOoXzi1TLXiHBJG+1HwL+ID2AnLv3oZT6PlJ1aORSU6oRHSSgjPMihc1eXyKPMdyD/ AqFJYySnhXSr/0KJyrtQDtju9Fr248wnuBcTNenyPVOZ0PHV8QNzp2jvcn1CbBa6l+An GMsEqyRqcPt8vX6qgUAu9wZb5RYF6Ezu+PIvFDfPlByy+bkmb4Blb0cd9dqhuxowHTZn MTjTD4Bg8pQ9Q9xgazplzVmi36XlNjsp/avPctiTShRqAN8PfMdK3maZbLpXpzZCOXP9 hrNEmNbrANp5WxgBJCzg9g832X4/sb7Ijvgq0pfVeoOJ2/arzBW23a2dvX/XrfcOvwke sHqw== X-Google-Smtp-Source: APXvYqwUYsousOMTeeL8c+A2HnTXT2l2mWYx2JCiWrVy/yAmVWlPJppOWrh94pnxO/J9vbn6442DXbT8N9OeaM9xXRs= X-Received: by 2002:a9d:5614:: with SMTP id e20mr3932876oti.348.1553199465574; Thu, 21 Mar 2019 13:17:45 -0700 (PDT) MIME-Version: 1.0 From: Martin Blumenstingl Date: Thu, 21 Mar 2019 21:17:34 +0100 Message-ID: Subject: 32-bit Amlogic (ARM) SoC: kernel BUG in kfree() To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: akpm@linux-foundation.org, mhocko@suse.com, willy@infradead.org, rppt@linux.ibm.com, linux-amlogic@lists.infradead.org, liang.yang@amlogic.com, linux@armlinux.org.uk, linux-mtd@lists.infradead.org Content-Type: text/plain; charset="UTF-8" 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: Hello, I am experiencing the following crash: ------------[ cut here ]------------ kernel BUG at mm/slub.c:3950! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.1.0-rc1-00080-g37b8cb064293-dirty #4252 Hardware name: Amlogic Meson platform PC is at kfree+0x250/0x274 LR is at meson_nfc_exec_op+0x3b0/0x408 ... my goal is to add support for the 32-bit Amlogic Meson SoCs (ARM Cortex-A5 / Cortex-A9 cores) in the meson-nand driver. I have traced this crash to the kfree() in meson_nfc_read_buf(). my observation is as follows: - meson_nfc_read_buf() is called 7 times without any crash, the kzalloc() call returns 0xe9e6c600 (virtual address) / 0x29e6c600 (physical address) - the eight time meson_nfc_read_buf() is called kzalloc() call returns 0xee39a38b (virtual address) / 0x2e39a38b (physical address) and the final kfree() crashes - changing the size in the kzalloc() call from PER_INFO_BYTE (= 8) to PAGE_SIZE works around that crash - disabling the meson-nand driver makes my board boot just fine - Liang has tested the unmodified code on a 64-bit Amlogic SoC (ARM Cortex-A53 cores) and he doesn't see the crash there in case the selected SLAB allocator is relevant: CONFIG_SLUB=y the following printk statement is used to print the addresses returned by the kzalloc() call in meson_nfc_read_buf(): printk("%s 0x%px 0x%08x\n", __func__, info, virt_to_phys(info)); my questions are: - why does kzalloc() return an unaligned address 0xee39a38b (virtual address) / 0x2e39a38b (physical address)? - how can further analyze this issue? - (I don't know where to start analyzing: in mm/, arch/arm/mm, the meson-nand driver seems to work fine on the 64-bit SoCs but that doesn't fully rule it out, ...) Regards Martin