Date: Thu, 18 Jun 2020 13:00:30 -0300 From: =?utf-8?Q?Lucas_Nali_de_Magalh=C3=A3es?= <rollingbits@gmail.com> To: Carlo Strub <cs@freebsd.org> Cc: freebsd-security@freebsd.org Subject: Re: Odd ssh sessions Message-ID: <08BDD3F1-D396-49F4-8DB6-0CFDE9411F8E@gmail.com> In-Reply-To: <A3FDF16D-6B51-43AD-81B1-CA1B42124D18@gmail.com> References: <A3FDF16D-6B51-43AD-81B1-CA1B42124D18@gmail.com>
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> On Jun 12, 2020, at 7:27 PM, Lucas Nali de Magalh=C3=A3es <rollingbits@gma= il.com> wrote: >> =EF=BB=BFOn Jun 12, 2020, at 7:10 PM, Lucas Nali de Magalh=C3=A3es <rolli= ngbits@gmail.com> wrote: >>> On Jun 12, 2020, at 3:23 AM, Carlo Strub <cs@freebsd.org> wrote: >>>> On Fri, 5 Jun 2020, 20:48 Lucas Nali de Magalh=C3=A3es, <rollingbits@gm= ail.com> wrote: >>>> On Jun 5, 2020, at 3:45 PM, Lucas Nali de Magalh=C3=A3es <rollingbits@= gmail.com> wrote: >>>>>=20 >>>>> I've an old machine where I play with FreeBSD and after a while off, I= came back and noted that >>>>> sometimes when I enter an ssh session part of the text repeats. It can= be many lines or it can be >>>>> just one or even it can be none. So it also looks like I found a memor= y problem. Is it just me? >>>> And I'm going from FreeBSD 12.1-p3 to 12.1-p5 in this case. >>=20 >>> =EF=BB=BFCan you elaborate on what steps you are doing to get to such a s= tate? >>=20 >>=20 >>=20 >> I wrote in the hope it was somewhat easy, sorry. I've difficulty in repro= ducing it myself. Network is not >> very reliable in it and I first though it was the WiFi but I observed it o= ver Ethernet IPv6, too. My sessions >> have some "host not found" and "connection lost." I access from a Window= s 10 machine. I've no idea if >> the things are related or not. I hope it have no relation with my typos. T= oday it was stable and I tried to >> use the sftp but Windows (for the first time) tried to resolve the IPv6 a= ddress and didn't find the host. >> The next ssh sessions had the line duplication problem. It's a 32bit Inte= l Celeron M notebook used for >> experimentation with customized FreeBSD (with make.conf and src.conf). >>=20 >=20 >=20 > $ cat /etc/make.conf > (...) > $ cat /etc/src.conf > (...) Usually the wifi is the problem on this machine. In fact, I'm no sure if the= se things are related. A few days ago the drive caused a double fault on detach. I was turning it o= ff and it ended in=20 a kernel backtrace. Nothing was saved on disk and the part of the message I c= ould read said=20 the wifi didn't allowed the detach (or something alike). This isn't common. T= he part of the=20 dmesg that is related to it is ugen4.2: <vendor 0x0bda product 0x8187> at usbus4 urtw0 on uhub0 urtw0: <Bulk-IN,Bulk-OUT,Bulk-OUT> on usbus4 urtw0: unknown RTL8187L type: 0x8000000 urtw0: rtl8187l rf rtl8225u hwrev none uhub_reattach_port: giving up port reset - device vanished wlan0: Ethernet address: 00:15:af:XX:XX:XX uhub_reattach_port: giving up port reset - device vanished and a few more messages of unrecognized devices follows in the dmesg. It's c= omputer bought in Brazil, if that matters. --=20 rollingbits =E2=80=94 =F0=9F=93=A7 rollingbits@gmail.com =F0=9F=93=A7 rollin= gbits@terra.com.br =F0=9F=93=A7 rollingbits@yahoo.com =F0=9F=93=A7 rollingbi= ts@globo.com =F0=9F=93=A7 rollingbits@icloud.com
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