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([2620:15c:2c1:200:55c7:81e6:c7d8:94b]) by smtp.gmail.com with ESMTPSA id o85sm12093475pfi.105.2019.02.06.10.48.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Feb 2019 10:48:14 -0800 (PST) Subject: Re: [BUG] kernel panic 4.14.95 in kmem_cache_alloc / build_skb To: Frank Wunderlich , netdev@vger.kernel.org References: From: Eric Dumazet Message-ID: <418df4d9-1f32-b7cd-f903-ff29751e3a22@gmail.com> Date: Wed, 6 Feb 2019 10:48:13 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 02/06/2019 09:36 AM, Frank Wunderlich wrote: > Hi, > > linux-net-mailinglist for reporting bugs seems not existing anymore and i have not found out the right one..."scripts/get_maintainer.pl -f ./include/linux/skbuff.h" shows only linux-kernel as mailing list which is not specific for network, so sorry, if i'm in the wrong mailinglist. > > i've recently noticed panics on my bananapi-r2 with kernel 4.14.95, but can't locate them in detail...all is pointing to kmem_cache_alloc and build_skb, but over complete different ways. so i guess it's network-related > > i currently don't know what is triggering this crashes, so i cannot reproduce them on my test-machine :( > > it's not only an oops...the machine stays still and have to be resettet, sometimes after an half hour running > > i had kernel 4.14.78 running before, so i think it's a change between these 2 Kernel-versions and no OS-related (debian-stretch) or Hardware-issue > > currently i test with 4.14.90, if it has same behaviour...at the moment it seems stable... > > i cannot test it with another kernel-branch (4.19+), because i need to test it on my productive machine till i find a way to reproduce it....maybe you can see a hint in stacktrace to guide me...at the moment crash occours unexpectely > > i looked through git-tree but did not found anything related > > regards Frank > > here my 3 recorded crash-logs...maybe you can point me in the right direction (reproduce/debug/fix): Make sure to try 4.14.98, as I am guessing this has been fixed by : dc489ad6a2f2fcebdaecb7b8532e0d02d272ac6a Fix "net: ipv4: do not handle duplicate fragments as overlapping"