Date: Fri, 9 Mar 2018 13:44:31 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-arm@freebsd.org, bob prohaska <fbsd@www.zefox.net> Subject: Re: Garbled console output on Pi3 Message-ID: <20180309214431.GA65874@www.zefox.net> In-Reply-To: <1520628270.84937.56.camel@freebsd.org> References: <20180307182117.GA55819@www.zefox.net> <1520628270.84937.56.camel@freebsd.org>
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On Fri, Mar 09, 2018 at 01:44:30PM -0700, Ian Lepore wrote: > On Wed, 2018-03-07 at 10:21 -0800, bob prohaska wrote: > > From time to time I observe garbled console output on a Pi3 running -current. > > The present revision is? > > FreeBSD 12.0-CURRENT (ZEFOX) #1 r330571: Wed Mar??7 00:58:23 PST 2018 > > but I don't think that's special; the same thing has shown up sporadically > > for the past month or so. > > > > The output looks like this: > > > > Mar??7 09:53:53 www kernel: pid 44970 (llvm-tblgen), uid 0, was killed: out of swap space > > sswawpa_spp_apgaegr:er iw:ndsaewap fii_ppnand_ieptge fiweaanrig:eti??r:teb u wfiifannidt deefebr:i fnbuiiuffontife tberwajit:e??: bu0f, bufeblfokb nj:r:o:??0,w2 b b22u3fo94aibj,tl: k??b0nosui:,z fe b1siz87erlk6:n,??o:sbi 4zue: : 202f901o669b604,? > > ????ej0sw: : > > r:ag le4,0paap9 g6_epb > > ???????inrkd: inendefifnioini:te t w1eai35t bu w2fai6t0f b,er:uf fbufoerbj: :bufo??bjs0:i , z0bl, blkeknno: 2: o16: 4260191,52 > > ?9393s7ize:,??1siz63e:84 4 > > 096 > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 210573, size: 4096 > > > > The first and last lines look normal, which seems to rule out errors in > > the serial link.? > > I can't come up with a reason for this. This was normal in the old > days, but console output is buffered these days, and the buffer size is > 128 bytes on arm[64], so if things are going to interleave it should be > in chunks of 128, not a few chars at a time like that. > > Oh... unless it's a case of userland and the kernel writing to the > terminal at the same time, independently of each other. ?Were you > running the commands that are failing from the console? > Nothing running from the console, all commands were through ssh sessions. Can you suggest any experiments that might shed light on what's going on? So far it seems -j8 buildworld and stress2 can provoke the effect. Thanks for reading! bob prohaska
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