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Date: Mon, 16 Mar 2015 09:21:38 +0000 From: "fugang.duan@...escale.com" <fugang.duan@...escale.com> To: Панов Андрей <rockford@...dex.ru>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org> Subject: RE: Bug in drivers/net/ethernet/freescale/fec_main.c, TX is broken. In 4.0.0-rc3 From: Панов Андрей <rockford@...dex.ru> Sent: Wednesday, March 11, 2015 4:12 AM > To: Duan Fugang-B38611; netdev@...r.kernel.org; linux-arm-kernel > Subject: Re: Bug in drivers/net/ethernet/freescale/fec_main.c, TX is > broken. In 4.0.0-rc3 > > Hello! > Adding lakml to cc: > > > Commit 2b995f63987013bacde99168218f9c7b252bdcf1 in 4.0.0-rc3 introduces > a nasty bug in transmit, corrupting packets. > > > > To reproduce: > > > > $ dd if=/dev/zero of=zeros bs=1M count=20 $ md5sum -b zeros > > 8f4e33f3dc3e414ff94e5fb6905cba8c *zeros > > > > This checksum is correct. > > > > Copy file "zeros" to another host with NFS, and it gets corrupted, > checksum is changed. > > File should be big, small amounts of transmit isn't affected. > > > > I use an i.MX6 Quad board. > > > > If this commit is reverted, all works fine. > > 3.19 works fine too. > And it is not random corruption, when copying all-zero file this is > received on NFS host: > $ hd zeros | head -16 > 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |................| > * > 0052c0f0 00 00 00 00 00 00 00 00 1c f0 9f e5 1c f0 9f e5 > |................| > 0052c100 1c f0 9f e5 1c f0 9f e5 1c f0 9f e5 1c f0 9f e5 > |................| > 0052c110 1c f0 9f e5 1c f0 9f e5 1c f0 9f e5 74 fb 00 00 > |............t...| > 0052c120 bc ff 93 00 c0 ff 93 00 c4 ff 93 00 c8 ff 93 00 > |................| > 0052c130 cc ff 93 00 d0 ff 93 00 d4 ff 93 00 d8 ff 93 00 > |................| > 0052c140 13 00 00 00 28 63 29 20 43 6f 70 79 72 69 67 68 |....(c) > Copyrigh| > 0052c150 74 20 32 30 30 37 2d 32 30 31 32 2c 20 46 72 65 |t 2007-2012, > Fre| > 0052c160 65 73 63 61 6c 65 20 53 65 6d 69 63 6f 6e 64 75 |escale > Semicondu| > 0052c170 63 74 6f 72 2e 20 41 6c 6c 20 72 69 67 68 74 73 |ctor. All > rights| > 0052c180 20 72 65 73 65 72 76 65 64 2e 00 00 dd 00 2c 41 | > reserved.....,A| > 0052c190 11 73 00 00 d3 74 00 00 3d 75 00 00 a9 78 00 00 > |.s...t..=u...x..| > 0052c1a0 4f 78 00 00 75 77 00 00 07 76 00 00 c3 79 00 00 > |Ox..uw...v...y..| > 0052c1b0 09 7a 00 00 75 7a 00 00 97 22 00 00 49 1f 00 00 > |.z..uz..."..I...| > 0052c1c0 b9 21 00 00 ff 70 00 00 90 21 90 00 23 4a 52 f8 > |.!...p...!..#JR.| > > Looks like zero page with vectors at beginning. > Freescale i.MX6 Quad-based Embedsky E9 board. > Hi, I try your case on i.MX6q sabresd board with net tree kernel. root@...escale ~$ uname -r 4.0.0-rc3-11071-gf00bbd2 With below test steps for 10 time, the zero file size range from 20M to 300M bytes, compare the md5sum checksum between i.MX6q and i.MX6q/PC host, the checksum is the same. root@...escale ~$ rm zeros root@...escale ~$ dd if=/dev/zero of=zeros bs=1M count=300 300+0 records in 300+0 records out 314572800 bytes (300.0MB) copied, 1.811459 seconds, 165.6MB/s root@...escale ~$ md5sum -b zeros 0d97a9cd8bbd7ce75a2a76bb06258915 zeros root@...escale ~$ cp zeros /mnt/nfs/ -f root@...escale ~$ rm zeros root@...escale ~$ cp /mnt/nfs/zeros ./ root@...escale ~$ md5sum -b zeros 0d97a9cd8bbd7ce75a2a76bb06258915 zeros Do you have any lost for reproduce the issue ? Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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