From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f68.google.com (mail-oi0-f68.google.com [209.85.218.68]) by dpdk.org (Postfix) with ESMTP id 42A162E81 for ; Mon, 27 Feb 2017 23:23:00 +0100 (CET) Received: by mail-oi0-f68.google.com with SMTP id f192so1586340oic.3 for ; Mon, 27 Feb 2017 14:23:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=oSevlLRAM1CL3NYeAb6DVI2U2aHu5Sq6waOeC6eUUCA=; b=iLADvDsKQ2oLkvIfaYK2BIGQoy0Ny0N+sxSFDCNtE4T6DLhv/x65mPbC3KrqTyPNdz uD0oib/nD75ZpHUARAtp4WMg9TuVu/L3vS6Z1vLkmpcc0Ry7/rDsHDmprmPA73WpPw1S Kql1NNR0HLTlyW3FFDThBXwRctcl67gTKNFiEveWAJiELH9ZNZjpWqreI1FsN9h6AWZ5 gMQGAgHwW7WtaZizuOc3Qd4sE2Oq8nY47doQpOJKS7v3Usrn7+1+y8VWgQuzvURlC+rC Ms+RQfCPSDeBzX3y6uWp4GQrTQdexnnLXYH/spO9oIMGfq1POyaWdnU199fHcxVPPLn0 U00A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=oSevlLRAM1CL3NYeAb6DVI2U2aHu5Sq6waOeC6eUUCA=; b=eHbRtPRCa6dePWmYFzbuZC8q4kGCh7nkV6ZfyiP6uBi37PyyFln+Q1AEl0zaqyvdrJ 4lsXD+GNsrQK63VyX08F9YX4BRheRxA1YhXVGtKs53FZG5rcQqq8pJ0PihuM1LLinofx JkBIqysaiZ0ipiudeFv/O9K+/zz2ZjRFr+p+fldC/jN7nktX3m7WBpHUdGbG08yw1tv3 rJEr+KD8vlhA+Ce4FTxzx147suEWR6gaRoB540ykbjJBAGRgXUf4KZuHEMD6TSwkLpbK m4GtrWtwQOyCz2AqKSJvi6sPZc3V+EJhQbMYgI57MbqLZnlGUAk17vOk39bco3l4csO/ BkKw== X-Gm-Message-State: AMke39mdgmYX26JCz/NzJuVHgxIdOyqifvr27HdYy6+GIVYTJuyFIeFeF56+Ul8+E+cB64v6GceubYnD9zzQnQ== X-Received: by 10.202.6.70 with SMTP id 67mr9120029oig.50.1488234179521; Mon, 27 Feb 2017 14:22:59 -0800 (PST) MIME-Version: 1.0 Received: by 10.182.110.38 with HTTP; Mon, 27 Feb 2017 14:22:39 -0800 (PST) In-Reply-To: <6F62EB32-671C-458D-B24B-268491C2DA1E@intel.com> References: <6F62EB32-671C-458D-B24B-268491C2DA1E@intel.com> From: Sushil Adhikari Date: Mon, 27 Feb 2017 16:22:39 -0600 Message-ID: To: "Wiles, Keith" Cc: "users@dpdk.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: Re: [dpdk-users] BUG: unable to handle kernel paging request X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Feb 2017 22:23:01 -0000 I narrowed it to location where it was failing, its coming from http://dpdk.org/browse/dpdk-stable/tree/lib/librte_eal/linuxapp/kni/kni_net= .c?h=3Dv16.07.2 line 169, I am getting the value of len to be 1358 from len=3Dkva->pkt_len; which seems right for ip packet and the memory allocation from line 157 also seems to be working fine. when I print the sizeof(*skb) or sizeof(struct sk_buff) its giving me 208, I guess I dont know whether it should be the size we allocate from line 157, which is len + 2 =3D 1360 or its fixed size structure of 208 byte. I would appreciate any insight. Linux version 4.4.20 (sushila@dev03) (gcc version 4.9.2 (crosstool-NG 1.20.0) ) #1 SMP Fri Feb 24 14:32:28 CST 2017 Thank you Sushil On Sat, Feb 25, 2017 at 10:31 AM, Wiles, Keith wrote: > > > On Feb 24, 2017, at 8:07 AM, Sushil Adhikari > wrote: > > > > Resending because of unsupported email content type > > > > > > yes hanging is the better word I guess, ctrl + c is not working to > actually stop the program. I also had display connected to the target > manchine and I have attached a picture that shows the messages in that > display that is where I saw "BUG:Unable to handle kernel paging request a= t > xxxxxx", which made me think that the program is in bad state. > > Sorry, I do not see why you are getting this message. All I can suggest i= s > to use GDB and see if you can determine why the message is happening. > > > > > info thread in gdb shows one thread running > > Id Target Id Frame > > * 1 LWP 843 "dpdkKni" 0x000000000044eaee in rte_kni_tx_burst () > > > > On Thu, Feb 23, 2017 at 5:41 PM, Wiles, Keith > wrote: > > > > > On Feb 23, 2017, at 2:38 PM, Sushil Adhikari > wrote: > > > > > > While trying to run dpdk Kni application I ran in to a problem, with > > > following error message > > > BUG: unable to handle kernel paging request at 000007ffe2b92780 > > > > > > To run the application I first unbinded the ports from kernel module > and > > > binded them to igb_uio > > >> echo 0000:05:00.1 > /sys/bus/pci/drivers/ixgbe/unbind > > >> echo 0000:05:00.0 > /sys/bus/pci/drivers/ixgbe/unbind > > >> echo 0x8086 0x1528 > /sys/bus/pci/drivers/igb_uio/new_id > > > > > > I ran the application using gdb as > > > > > > [~]$ /root/gdb dpdkKni > > > GNU gdb (crosstool-NG 1.20.0) 7.8 > > > Copyright (C) 2014 Free Software Foundation, Inc. > > > License GPLv3+: GNU GPL version 3 or later < > http://gnu.org/licenses/gpl.html > > >> > > > This is free software: you are free to change and redistribute it. > > > There is NO WARRANTY, to the extent permitted by law. Type "show > copying" > > > and "show warranty" for details. > > > This GDB was configured as "x86_64-unknown-linux-gnu". > > > Type "show configuration" for configuration details. > > > For bug reporting instructions, please see: > > > . > > > Find the GDB manual and other documentation resources online at: > > > . > > > For help, type "help". > > > Type "apropos word" to search for commands related to "word"... > > > Reading symbols from dpdkKni...(no debugging symbols found)...done. > > > (gdb) Run dpdkKni -c 0x0f -n 4 -- -P -p 0x3 --config=3D"(0,0,1),(1,2,= 3)" > > > Starting program: /root/dpdkKni dpdkKni -c 0x0f -n 4 -- -P -p 0x3 > > > --config=3D"(0,0,1),(1,2,3)" > > > warning: Could not load shared library symbols for linux-vdso.so.1. > > > Do you need "set solib-search-path" or "set sysroot"? > > > warning: Unable to find libthread_db matching inferior's thread > library, > > > thread debugging will not be available. > > > EAL: Detected 4 lcore(s) > > > EAL: Probing VFIO support... > > > EAL: PCI device 0000:05:00.0 on NUMA socket -1 > > > EAL: probe driver: 8086:1528 net_ixgbe > > > EAL: PCI device 0000:05:00.1 on NUMA socket -1 > > > EAL: probe driver: 8086:1528 net_ixgbe > > > Address of pktmbuf_pool 0x7ffff5a7dec0 > > > APP: Initialising port 0 ... > > > KNI: pci: 05:00:00 8086:1528 > > > kni created for port 0 with kni[i] address 0x7fff75638280 with i 0 > > > APP: Initialising port 1 ... > > > KNI: pci: 05:00:01 8086:1528 > > > kni created for port 1 with kni[i] address 0x7fff75629e00 with i 0 > > > APP: Lcore 1 is writing to port 0 > > > APP: Lcore 2 is reading from port 1 > > > APP: Lcore 3 is writing to port 1 > > > APP: Lcore 0 is reading from port 0 > > > ^C > > > Program received signal SIGINT, Interrupt. > > > > The program did not crash or get a segfault, but you hit control-c whic= h > stopped the application. When you ran the application you started 4 threa= ds > and this is why it would appear in different places when stopped. > > > > If the application is hanging then you can use control-C and then do > =E2=80=98info threads=E2=80=99 command to see the location of all threads= . You can use the > =E2=80=98thread X=E2=80=99 command to switch between threads. Please chec= k the command > usage here I am going from memory. > > > > I am not sure if the application has a -i option to get a command line > if so that maybe useful to enable, check the application to see if it use= d > cmdline feature. > > > > It maybe the application just sits running and you have to use other > tools or apps to send traffic on the KNI application, sorry I have not > really used the KNI example. > > > > > 0x000000000044e916 in rte_kni_tx_burst () > > > (gdb) backtrace > > > #0 0x000000000044e916 in rte_kni_tx_burst () > > > #1 0x0000000000619758 in main_loop(void*) () > > > #2 0x0000000000431183 in rte_eal_mp_remote_launch () > > > #3 0x000000000040d312 in main () > > > > > > (this is where the program crashes) > > > > > > I tried to trace the crash with gdb(I am new to gdb) > > > > > > and when I do the backtrace it ends up in different functions each > time: > > > this time it gave me rte_kni_tx_burst() > > > > > > I'm running latest dpdk version 17.02 and linux kernel is > > > Linux version 4.4.20 (tcuser@cibuild08) (gcc version 4.9.2 > (crosstool-NG > > > 1.20.0) ) #1 SMP > > > > > > I would appreciate any suggestion or insight regarding this issue. > > > > Regards, > > Keith > > > > > > > > Regards, > Keith > >