newfs silently fails if random is not ready (?)

[Lev Serebryakov]

Hello Conrad,

Tuesday, September 4, 2018, 11:37:59 PM, you wrote:

> Newfs just uses arc4random(3) to generate its FSID and generation
> numbers.  arc4random(3) is seeded from getentropy(3) -> getrandom(2)
->> read_random_uio(9), which is what produces the "random:
> read_random_uio unblock wait" messages.

> Is newfs tripping on a raise()/abort() in arc4random(3) /
> getentropy(3)?
  Nope, it is silently does nothing

>   Is your program that runs newfs checking for non-zero
> exit status?
  It is not "my" program, it is system mdmfs(8), and it checks exit
 statuses, as far as I can see from source code.

>  Do you see any newfs cores when this happens?
  It is very first step in diskless boot, so no cores are possible, but I don't
 see "core dumped" messages too.

> Thanks,
> Conrad

> On Tue, Sep 4, 2018 at 1:08 PM, Lev Serebryakov <lev at freebsd.org> wrote:
>> Hello FreeBSD,
>>
>>  I have problems with diskless install when kernel doesn't have tmpfs and
>> random device takes long time to unlock.
>>
>>  Looks like newfs used to create in-memory /etc (on /dev/md0) silently fail
>> to create FS.
>>
>>  I've added '-XL' options to mdmfs and it looks like this:
>>
>> da0: quirks=0x2<NO_6_BYTE>
>> arc4random: no preloaded entropy cache
>> arc4random: no preloaded entropy cache
>> *** Figure out our NFS root path ***
>> *** handle_remount /conf ***
>> *** templates are base default ***
>> *** handle_remount /conf/base/etc ***
>> *** handle_remount /conf/base/var ***
>> *** handle_remount /conf/default/etc ***
>> *** handle_remount /conf/default/var ***
>> *** create_md etc with size 20480 ***
>> DEBUG: running: /sbin/mdconfig -a -t swap -s 10485760B
>> DEBUG: running: /sbin/newfs -U /dev/md0
>> random: read_random_uio unblock wait
>> random: read_random_uio unblock wait
>> random: unblocking device.
>> DEBUG: running: /sbin/mount /dev/md0 /etc
>> mount: /dev/md0: No such file or directory
>> mdmfs: mount exited with error code 1
>>
>>  "/dev/md0" is here, but it is empty, without any FS.
>>
>>  I could run "/sbin/newfs -U /dev/md0" later by hands and it works.
>>
>> --
>> Best regards,
>>  Lev                          mailto:lev at FreeBSD.org
>>
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-- 
Best regards,
 Lev                            mailto:lev at FreeBSD.org