zfs deadlock

[krichy at cflinux.hu]

Dear Steven,

While I was playig with zfs, trying to reproduce the previous bug, 
accidentaly hit another one, which caused a trace I attached.

The snapshot contains directories in 2 depth, which contain files. It 
was to simulate a vmail setup, with domain/user hierarchy.

I hope it is useful for someone.

I used the attached two scripts to reproduce the ZFS bug.

It definetly crashes the system, in the last 10 minutes it is the 3rd 
time.

Regards,
2013-12-05 20:26 időpontban krichy at cflinux.hu ezt írta:
> Dear Steven,
> 
> Thanks for your reply. Do you know how to reproduce the bug? Because
> simply sending a snapshot which is mounted does not automatically
> trigger the deadlock. Some special cases needed, or what?
> How to prove that the patch fixes this?
> 
> Regards,
> 2013-12-05 19:39 időpontban Steven Hartland ezt írta:
>> Known issue you want:
>> http://svnweb.freebsd.org/changeset/base/258595
>> 
>>    Regards
>>    Steve
>> 
>> ----- Original Message ----- From: "Richard Kojedzinszky" 
>> <krichy at cflinux.hu>
>> To: <freebsd-fs at freebsd.org>
>> Sent: Thursday, December 05, 2013 2:56 PM
>> Subject: zfs deadlock
>> 
>> 
>>> Dear fs devs,
>>> 
>>> We have a freenas server, which is basicaly a freebsd. I was trying 
>>> to look at snapshots using ls .zfs/snapshot/.
>>> 
>>> When I issued it, the system entered a deadlock. An NFSD was running, 
>>> a zfs send was running when I issued the command.
>>> 
>>> I attached to command outputs while the system was in a deadlock 
>>> state. I tried to issue
>>> # reboot -q
>>> But that did not restart the system. After a while (5-10 minutes) the 
>>> system rebooted, I dont know if the deadman caused that.
>>> 
>>> Now the system is up and running.
>>> 
>>> It is basically a freebsd 9.2 kernel.
>>> 
>>> Do someone has a clue?
>>> 
>>> Kojedzinszky Richard
>> 
>> 
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>> 
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