On 5/27/2010 2:45 PM, Jan Kryl wrote:
> Hi Frank,
> On 24/05/10 16:52 -0400, Frank Middleton wrote:
>> Many many moons ago, I submitted a CR into bugs about a
>> highly reproducible panic that occurs if you try to re-share
>> a lofi mounted image. That CR has AFAIK long since
>> disappeared - I even forget what it was called.
>> This server is used for doing network installs. Let's say
>> you have a 64 bit iso lofi-mounted and shared. You do the
>> install, and then wish to switch to a 32 bit iso. You unshare,
>> umount, delete the loopback, and then lofiadm the new iso,
>> mount it and then share it. Panic, every time.
>> Is this such a rare use-case that no one is interested? I have
>> the backtrace and cores if anyone wants them, although
>> such were submitted with the original CR. This is pretty
>> frustrating since you start to run out of ideas for mountpoint
>> names after a while unless you forget and get the panic.
>> FWIW (even on a freshly booted system after a panic)
>> # lofiadm zyzzy.iso /dev/lofi/1
>> # mount -F hsfs /dev/lofi/1 /mnt
>> mount: /dev/lofi/1 is already mounted or /mnt is busy
>> # mount -O -F hsfs /dev/lofi/1 /mnt
>> # share /mnt
>> If you unshare /mnt and then do this again, it will panic.
>> This has been a bug since before Open Solaris came out.
>> It doesn't happen if the iso is originally on UFS, but
>> UFS really isn't an option any more. FWIW the dataset
>> containing the isos has the sharenfs attribute set,
>> although it doesn;t have to be actually mounted by
>> any remote NFS for this panic to occur.
>> Suggestions for a workaround most welcome!
> the bug (6798273) has been closed as incomplete with following
> "I cannot reproduce any issue with the given testcase on b137."
> So you should test this with b137 or newer build. There have
> been some extensive changes going to treeclimb_* functions,
> so the bug is probably fixed or will be in near future.
> Let us know if you can still reproduce the panic on
> recent build.
I don't know if the code path is the same enough, bu you should also try
it like this:
# mount -F hsfs zyzzy.iso /mnt
For many builds now, (Open)Solaris hasn't needed the 'lofiadm' step for
ISO's (and possibly other FS's that can be guessed)
I now put ISO's (for installs just like you) directly in my /etc/vfstab.
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