NetBSD Problem Report #48028

From www@NetBSD.org  Mon Jul  8 02:58:24 2013
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Date: Mon,  8 Jul 2013 02:58:23 +0000 (UTC)
From: aran@100acres.us
Reply-To: aran@100acres.us
To: gnats-bugs@NetBSD.org
Subject: Read from /dev/random hangs
X-Send-Pr-Version: www-1.0

>Number:         48028
>Category:       kern
>Synopsis:       Read from /dev/random hangs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    riastradh
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 08 03:00:01 +0000 2013
>Closed-Date:    Sun Jul 21 23:03:11 +0000 2013
>Last-Modified:  Sun Jul 21 23:03:11 +0000 2013
>Originator:     Aran Clauson
>Release:        6.99.23
>Organization:
>Environment:
NetBSD sanders 6.99.23 NetBSD 6.99.23 (GENERIC) #7: Sun Jul  7 19:08:24 PDT 2013  aran@sanders:/home/NetBSD/obj/sys/arch/amd64/compile/GENERIC amd64
>Description:
At boot, cgdconfig hangs when configuring randomly keyed device.  The hang occurs when reading from /dev/random.  I've chased this into sys/kern/subr_cprng.c line 197 in the call to cv_wait_sig.  
>How-To-Repeat:
Compiler source from July 2, 2013, boot, read from /dev/random while initializing the system.
>Fix:

>Release-Note:

>Audit-Trail:
From: Taylor R Campbell <riastradh@NetBSD.org>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Tue, 9 Jul 2013 23:22:44 +0000

 Did it hang before a kernel update?  If so, when was your previous
 kernel from?

 Does banging on the keyboard like a monkey unwedge the system?

 What entropy sources do you have on your system (rndctl -l)?

 Is this in the usual /etc/rc.d/cgd -- that is, for a device listed in
 /etc/cgd/cgd.conf?  If not, how are you invoking cgdconfig?

 Did you have an entropy file (/var/db/entropy-file)?  (Note that
 /etc/rc.d/rndctl will delete it on boot, and recreate it on shutdown
 -- if shutdown is clean.)

 Can you try using a kernel with options RND_DEBUG and RND_VERBOSE?

From: Aran Clauson <aran@otsys.com>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Wed, 10 Jul 2013 09:05:46 -0700 (PDT)

 >  Did it hang before a kernel update?  If so, when was your previous
 >  kernel from?
 >  
 >  Does banging on the keyboard like a monkey unwedge the system?
 >  
 >  What entropy sources do you have on your system (rndctl -l)?
 >  
 >  Is this in the usual /etc/rc.d/cgd -- that is, for a device listed in
 >  /etc/cgd/cgd.conf?  If not, how are you invoking cgdconfig?
 >  
 >  Did you have an entropy file (/var/db/entropy-file)?  (Note that
 >  /etc/rc.d/rndctl will delete it on boot, and recreate it on shutdown
 >  -- if shutdown is clean.)
 >  
 >  Can you try using a kernel with options RND_DEBUG and RND_VERBOSE?
 >  
 The kernel build from 

 $ cvs -q up -dP -D '07/01/2013' 

 works just fine.  Kernel build from 

 $ cvs -q up -dP -D '07/02/2013' 

 hangs on cgdconfig at boot.  My current kernel source is from 07/07/2013 with
 the same behavior as 07/02. 

 I am trying to read from /dev/random while I write this email.  I'm still
 waiting...  It took 1m25.524s.  

 $ rndctl -l 

 Source                 Bits Type      Flags
 cd0                       0 disk estimate, collect
 wd0                   15816 disk estimate, collect
 cpu3                    545 vm   estimate, collect
 cpu2                    165 vm   estimate, collect
 cpu1                    154 vm   estimate, collect
 cpu0                   1926 vm   estimate, collect
 coretemp1-cpu2          839 env  estimate, collect
 coretemp0-cpu0          718 env  estimate, collect
 wm0                       0 net  
 pms0                  36559 tty  estimate, collect
 pckbd0                 4317 tty  estimate, collect
 acpitz0-cpu0/cp          12 env  estimate, collect
 thinkpad0-fan-s          21 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe           0 env  estimate, collect
 thinkpad0-tempe          51 env  estimate, collect
 acpibat0-discha           0 env  estimate, collect
 acpibat0-charge           0 env  estimate, collect
 system-power              1 power estimate, collect
 callout                   0 skew collect


 I have to cgd devices.  One has a fixed key and contains my normal file systems.
 The other uses a random key and contains my swap space.  Basically I followed
 the how to in the cgd manual.  

 I'm not sure how to check if I have an entropy-file.  This, however, may be the
 problem.  /var is one of the cgd filesystems.  

 I will build a new kernel with these two options and report back.


 Aran

From: Taylor R Campbell <riastradh@NetBSD.org>
To: Aran Clauson <aran@otsys.com>
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Thu, 11 Jul 2013 23:30:02 +0000

    Date: Wed, 10 Jul 2013 16:10:01 +0000
    From: Aran Clauson <aran@otsys.com>

    The kernel build from 

    $ cvs -q up -dP -D '07/01/2013' 

    works just fine.  Kernel build from 

    $ cvs -q up -dP -D '07/02/2013' 

    hangs on cgdconfig at boot.  My current kernel source is from
    07/07/2013 with the same behavior as 07/02.

 OK, chances are it was triggered (if not caused) by
 <https://mail-index.netbsd.org/source-changes/2013/07/01/msg045202.html>.

    I am trying to read from /dev/random while I write this email.  I'm still
    waiting...  It took 1m25.524s.  

 Does banging on the keyboard or trackpad like a monkey affect that?

    I have to cgd devices.  One has a fixed key and contains my normal
    file systems.  The other uses a random key and contains my swap
    space.  Basically I followed the how to in the cgd manual.

    I'm not sure how to check if I have an entropy-file.  This,
    however, may be the problem.  /var is one of the cgd filesystems.

 In that case, /etc/rc.d/random_seed (which I mistakenly referred to as
 /etc/rc.d/rndctl in my last message) won't be able to load it after
 /var is mounted but before the swap cgd is randomkey-configured.

 As an alternative, if your root file system is unencrypted and
 persistently writable, you could store the entropy file in the root:

 1. Set random_file=/entropy in /etc/rc.conf.
 2. Add the command `rndseed /entropy' to your /boot.cfg file.

 That way, /etc/rc.d/random_seed will save entropy to /entropy on
 shutdown, and the boot loader (not /etc/rc) will load it early on
 boot, well before /etc/rc.d/cgd runs.

 However, while this might work around the problem, it doesn't explain
 why the problem recently arose.

    I will build a new kernel with these two options and report back.

 OK, thanks.  If that doesn't reveal anything, I can try putting more
 debugging messages in.


 As an aside, we really ought to do encrypted swap another way, not by
 configuring a cgd.  Encrypted swap ought to have zero administrative
 hassle (and be on by default...).

From: Aran Clauson <aran@otsys.com>
To: riastradh@NetBSD.org
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Thu, 18 Jul 2013 20:38:46 -0700 (PDT)

 Taylor,

 I'm running a kernel built from sources as of this morning (7/18/2013) with the
 debugging options you specified.  Sixteen byte reads from /dev/random are still
 taking a long time (3:35, 1:02, 1:47).  

 The rnd message are as follows:

 $ dmesg | grep rnd
 rnd: callout attached as an entropy source (collecting without estimation)
 rnd: initialised (4096) with counter
 rnd: WARNING! initial entropy low (3).
 rnd: starting statistical RNG test, entropy = 4.
 rnd: statistical RNG test done, entropy = 4.
 rnd: WARNING! initial entropy low (0).
 rnd: system-power attached as an entropy source (collecting)
 rnd: WARNING! initial entropy low (1).
 rnd: WARNING! initial entropy low (0).
 rnd: acpibat0-charge attached as an entropy source (collecting)
 rnd: acpibat0-discha attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-fan-s attached as an entropy source (collecting)
 rnd: acpitz0-cpu0/cp attached as an entropy source (collecting)
 rnd: pckbd0 attached as an entropy source (collecting)
 rnd: pms0 attached as an entropy source (collecting)
 rnd: wm0 attached as an entropy source (off)
 rnd: coretemp0-cpu0 attached as an entropy source (collecting)
 rnd: coretemp1-cpu2 attached as an entropy source (collecting)
 rnd: cpu0 attached as an entropy source (collecting)
 rnd: cpu1 attached as an entropy source (collecting)
 rnd: cpu2 attached as an entropy source (collecting)
 rnd: cpu3 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: wd0 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: cd0 attached as an entropy source (collecting)
 rnd: empty, asking for 508 bits
 rnd: WARNING! initial entropy low (28).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: WARNING! initial entropy low (6).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: have initial entropy (84)
 rnd: source wd0 is fast (1 samples at once, 188 bits in 6 seconds), processing samples in bulk.
 rnd: source pms0 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source pckbd0 is fast (1 samples at once, 72 bits in 156 seconds), processing samples in bulk.
 rnd: source coretemp1-cpu2 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source coretemp0-cpu0 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source thinkpad0-tempe is fast (1 samples at once, 21 bits in 205 seconds), processing samples in bulk.
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: source thinkpad0-fan-s is fast (1 samples at once, 40 bits in 383 seconds), processing samples in bulk.
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 502 bits



 Aran

From: Aran Clauson <aran@otsys.com>
To: riastradh@NetBSD.org
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Thu, 18 Jul 2013 22:07:56 -0700 (PDT)

 Taylor,

 With sources from 7/1 I see the following:

 $ dmesg | grep rnd
 rnd: pms0 attached as an entropy source (collecting)
 rnd: wm0 attached as an entropy source (off)
 rnd: coretemp0-cpu0 attached as an entropy source (collecting)
 rnd: coretemp1-cpu2 attached as an entropy source (collecting)
 rnd: cpu0 attached as an entropy source (collecting)
 rnd: cpu1 attached as an entropy source (collecting)
 rnd: cpu2 attached as an entropy source (collecting)
 rnd: cpu3 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: wd0 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: cd0 attached as an entropy source (collecting)
 rnd: empty, asking for 508 bits
 rnd: WARNING! initial entropy low (28).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: WARNING! initial entropy low (6).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: have initial entropy (84)
 rnd: source wd0 is fast (1 samples at once, 188 bits in 6 seconds), processing samples in bulk.
 rnd: source pms0 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source pckbd0 is fast (1 samples at once, 72 bits in 156 seconds), processing samples in bulk.
 rnd: source coretemp1-cpu2 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source coretemp0-cpu0 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source thinkpad0-tempe is fast (1 samples at once, 21 bits in 205 seconds), processing samples in bulk.
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: source thinkpad0-fan-s is fast (1 samples at once, 40 bits in 383 seconds), processing samples in bulk.
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: callout attached as an entropy source (collecting without estimation)
 rnd: initialised (4096) with counter
 rnd: WARNING! initial entropy low (3).
 rnd: starting statistical RNG test, entropy = 4.
 rnd: statistical RNG test done, entropy = 4.
 rnd: WARNING! initial entropy low (0).
 rnd: system-power attached as an entropy source (collecting)
 rnd: WARNING! initial entropy low (1).
 rnd: WARNING! initial entropy low (0).
 rnd: acpibat0-charge attached as an entropy source (collecting)
 rnd: acpibat0-discha attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-tempe attached as an entropy source (collecting)
 rnd: thinkpad0-fan-s attached as an entropy source (collecting)
 rnd: acpitz0-cpu0/cp attached as an entropy source (collecting)
 rnd: pckbd0 attached as an entropy source (collecting)
 rnd: pms0 attached as an entropy source (collecting)
 rnd: wm0 attached as an entropy source (off)
 rnd: coretemp0-cpu0 attached as an entropy source (collecting)
 rnd: coretemp1-cpu2 attached as an entropy source (collecting)
 rnd: cpu0 attached as an entropy source (collecting)
 rnd: cpu1 attached as an entropy source (collecting)
 rnd: cpu2 attached as an entropy source (collecting)
 rnd: cpu3 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: wd0 attached as an entropy source (collecting)
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: cd0 attached as an entropy source (collecting)
 rnd: empty, asking for 508 bits
 rnd: WARNING! initial entropy low (28).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: WARNING! initial entropy low (6).
 rnd: WARNING! initial entropy low (0).
 rnd: empty, asking for 512 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 511 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 510 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 509 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 508 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 507 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 506 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 505 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 504 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 503 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: empty, asking for 502 bits
 rnd: have initial entropy (84)
 rnd: source wd0 is fast (1 samples at once, 188 bits in 6 seconds), processing samples in bulk.
 rnd: source pckbd0 is fast (1 samples at once, 20 bits in 11 seconds), processing samples in bulk.
 rnd: hard, want = 16, strength = 16, bytesonkey = 0
 rnd: new bytesonkey 0
 rnd: hard, want = 16, strength = 16, bytesonkey = 0
 rnd: new bytesonkey 0
 rnd: source coretemp1-cpu2 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source pms0 is fast (1 samples at once, 16 bits in 156 seconds), processing samples in bulk.
 rnd: source coretemp0-cpu0 is fast (1 samples at once, 16 bits in 158 seconds), processing samples in bulk.
 rnd: source thinkpad0-fan-s is fast (1 samples at once, 20 bits in 179 seconds), processing samples in bulk.
 rnd: source thinkpad0-tempe is fast (1 samples at once, 28 bits in 267 seconds), processing samples in bulk.
 rnd: hard, want = 512, strength = 16, bytesonkey = 0
 rnd: new bytesonkey 0


 Aran

From: Taylor R Campbell <riastradh@NetBSD.org>
To: Aran Clauson <aran@otsys.com>
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Fri, 19 Jul 2013 14:33:46 +0000

 This is a multi-part message in MIME format.
 --=_EVwwZEfBOLU3b7fuOMOrvjPV5u43+fi5

 Thanks!  Can you please try the attached patch?  Apply with

    patch -d /path/to/netbsd/src -p1 < rndread.patch

 --=_EVwwZEfBOLU3b7fuOMOrvjPV5u43+fi5
 Content-Type: application/octet-stream; name="rndread"
 Content-Transfer-Encoding: base64
 Content-Disposition: attachment; filename="rndread.patch"

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 --=_EVwwZEfBOLU3b7fuOMOrvjPV5u43+fi5--

From: Taylor R Campbell <riastradh@NetBSD.org>
To: Aran Clauson <aran@otsys.com>
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Fri, 19 Jul 2013 14:37:34 +0000

 This is a multi-part message in MIME format.
 --=_0QJpMfQBgNj0ADmREqdCYuq5HuebiW27

 Oops, there was a stray brace in that version of the patch, sorry.
 Let's try that again:

 --=_0QJpMfQBgNj0ADmREqdCYuq5HuebiW27
 Content-Type: application/octet-stream; name="rndread"
 Content-Transfer-Encoding: base64
 Content-Disposition: attachment; filename="rndread.patch"

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From: Aran Clauson <aran@otsys.com>
To: riastradh@NetBSD.org
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/48028: Read from /dev/random hangs
Date: Sun, 21 Jul 2013 10:03:25 -0700 (PDT)

 Taylor,

 That patch fixed it!  I've changed by cgd-swap configuration back to /dev/random
 and the system start normally.  Thanks.

 Aran

From: "Taylor R Campbell" <riastradh@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/48028 CVS commit: src/sys/dev
Date: Sun, 21 Jul 2013 22:30:19 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sun Jul 21 22:30:19 UTC 2013

 Modified Files:
 	src/sys/dev: rndpseudo.c

 Log Message:
 When reading from /dev/random, block at most once in cprng_strong.

 We are not obligated to return exactly as many bytes as requested,
 and many applications -- notably those that use stdio or otherwise
 buffered I/O to read from /dev/random -- try to read many more than
 32 bytes at a time from /dev/random even if all they are about to use
 is 32 bytes.

 In this case, blocking until we have enough entropy to fill a large
 buffer causes needless application delays, e.g. causing cgdconfig
 (which reads from /dev/random with stdio) to hang at boot when trying
 to configure a random-keyed device for swap.

 Patch tested by Aran Clauson.  Fixes PR kern/48028.


 To generate a diff of this commit:
 cvs rdiff -u -r1.15 -r1.16 src/sys/dev/rndpseudo.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

Responsible-Changed-From-To: kern-bug-people->riastradh
Responsible-Changed-By: riastradh@NetBSD.org
Responsible-Changed-When: Sun, 21 Jul 2013 23:03:11 +0000
Responsible-Changed-Why:
mine


State-Changed-From-To: open->closed
State-Changed-By: riastradh@NetBSD.org
State-Changed-When: Sun, 21 Jul 2013 23:03:11 +0000
State-Changed-Why:
fixed


>Unformatted:

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