zfs deadlock

[Steven Hartland]

Thats correct it unmounts the mounted snapshot.

    Regards
    Steve

----- Original Message ----- 
From: <krichy at cflinux.hu>
To: "Steven Hartland" <killing at multiplay.co.uk>
Cc: <freebsd-fs at freebsd.org>
Sent: Friday, December 06, 2013 8:50 AM
Subject: Re: zfs deadlock


> What is strange also, when a zfs send finishes, the paralell running find command issues errors:
>
> find: ./e/Chuje: No such file or directory
> find: ./e/singe: No such file or directory
> find: ./e/joree: No such file or directory
> find: ./e/fore: No such file or directory
> find: fts_read: No such file or directory
> Fri Dec  6 09:46:04 CET 2013 2
>
> Seems if the filesystem got unmounted meanwhile. But the script is changed its working directory to the snapshot dir.
>
> Regards,
>
> 2013-12-06 09:03 időpontban krichy at cflinux.hu ezt írta:
>> 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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