Date: Sun, 2 Nov 2014 21:49:23 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Ian Lepore <ian@FreeBSD.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, Adrian Chadd <adrian@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Mark R V Murray <mark@grondar.org> Subject: Re: svn commit: r273958 - head/sys/dev/random Message-ID: <20141102194922.GD53947@kib.kiev.ua> In-Reply-To: <1414955700.1200.6.camel@revolution.hippie.lan> References: <201411020201.sA221unt091493@svn.freebsd.org> <720EB74E-094A-43F3-8B1C-47BC7F6FECC3@grondar.org> <1414934579.17308.248.camel@revolution.hippie.lan> <6FB65828-6A79-4BDE-A9F7-BC472BA538CE@grondar.org> <CAJ-VmomeOwE3LOpehhJ__G=FCoBDRXrrn%2BSfjwPFODts6YYHNQ@mail.gmail.com> <1414955700.1200.6.camel@revolution.hippie.lan>
index | next in thread | previous in thread | raw e-mail
On Sun, Nov 02, 2014 at 12:15:00PM -0700, Ian Lepore wrote: > On Sun, 2014-11-02 at 11:05 -0800, Adrian Chadd wrote: > > [snip all the conversation] > > > > Ok. There's still a problem that I can trigger by trying to Ctrl-C a > > process that's blocked reading for randomness. I'll try to chase up > > more details about and file a PR about it. > > > > The unfortunate part is that the kernel side stack trace of the > > offending / hung process isn't currently helpful. :( > > > > > > > > > > -adrian > > Possibly related... when I had the boot time save-entropy stuff stuck in > a read yesterday I tried ^T and it first reported the hung process in a > "block" wait. Any subsequent ^T showed the process as runnable and the > cpu usage as 100%. This is on a single-core arm. > Yes, this is because error from tsleep() in random_adaptor_read() does not abort the loop. But next loop iteration calls tsleep() which returns immediately since there is still pending signal. The process continues indefinitely.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20141102194922.GD53947>