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XROOTD-L  July 2020

XROOTD-L July 2020

Subject:

Re: Crash with "Attempt to free invalid pointer" in xcache for xrd5 rc4

From:

Andrew Hanushevsky <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Wed, 8 Jul 2020 15:00:07 -0700

Content-Type:

MULTIPART/MIXED

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (285 lines)

Could you try git head? There were issues in RC4. There might still be 
issues, but I never saw the one you and Nikolai tripped over.

Andy


On Wed, 8 Jul 2020, Matevz Tadel wrote:

> On 2020-07-08 14:19, Andrew Hanushevsky wrote:
>> What release? Git head?
>
> This was from Nikolai's image, 5-rc4.
>
> \m
>
>> On Wed, 8 Jul 2020, Matevz Tadel wrote:
>> 
>>> Hi Andy,
>>> 
>>> On 2020-07-08 13:49, Andrew Hanushevsky wrote:
>>>> Hi Matevz,
>>>> 
>>>> Well, what kind of authentication? Clearly, the kind we use doesn't cause 
>>>> this
>>>> problem. It could be just a random core smash but if it's random we 
>>>> should be
>>>> various effects not just a crash in this particular code path, right?
>>> 
>>> xcache without any security config, everything works smooth.
>>> 
>>> xcache with sec.protocol /usr/lib64 gsi --- trouble:
>>> 
>>> 200708 13:38:44 240995 XrootdXeq: matevz.241046:31@uaf-7 pub IPv4 login as 
>>> d0ba0e6c.0
>>> 200708 13:38:44 240995 Posix_P2L: file 
>>> /eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root 
>>> pfn2lfn 
>>> /eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root
>>> [2020-07-08 13:38:44.739012 -0700][Error  ][AsyncSock         ] 
>>> [[log in to unmask]:1094.0] Unable to connect: network is unreachable
>>> [2020-07-08 13:38:44.739092 -0700][Error  ][PostMaster        ] 
>>> [[log in to unmask]:1094] elapsed = 0, pConnectionWindow = 120 seconds.
>>> [2020-07-08 13:38:45.637583 -0700][Error  ][XRootDTransport   ] 
>>> [[log in to unmask]:1094.0] Authentication with gsi failed:
>>> [2020-07-08 13:38:45.974332 -0700][Error  ][AsyncSock         ] 
>>> [[log in to unmask]:1095.0] Unable to connect: network is 
>>> unreachable
>>> [2020-07-08 13:38:45.974400 -0700][Error  ][PostMaster        ] 
>>> [[log in to unmask]:1095] elapsed = 0, pConnectionWindow = 120 
>>> seconds.
>>> 200708 13:38:46 240995 XrdPfc_Manager: info Cache::Attach() 
>>> root:[log in to unmask] 
>>> 200708 13:38:46 240995 XrdPfc_Manager: debug Cache::GetFile 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root, io 
>>> 0xe30f50
>>> 200708 13:38:46 240995 XrdPfc_IO: debug IOEntireFile::initCachedStat get 
>>> stat from client res = 0, size = 2272072 
>>> root:[log in to unmask] 
>>> 200708 13:38:46 240995 XrdPfc_File: debug Creating new file info, data 
>>> size = 2272072 num blocks = 3 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root
>>> 200708 13:38:46 240995 XrdPfc_Manager: debug Cache::inc_ref_cnt 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root, 
>>> cnt at exit = 1
>>> 200708 13:38:46 240995 XrdPfc_File: debug File::AddIO() io = 0xe30f50 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root
>>> 200708 13:38:46 240995 XrdPfc_Manager: debug Cache::Attach() 
>>> root:[log in to unmask] 
>>> location: [log in to unmask]:1095
>>> [2020-07-08 13:38:47.022428 -0700][Error  ][AsyncSock         ] 
>>> [[log in to unmask]:1095.0] Socket error encountered: [ERROR] 
>>> Invalid arguments
>>> [2020-07-08 13:38:47.022506 -0700][Error  ][XRootD            ] 
>>> [[log in to unmask]:1095] Unable to get the response to request 
>>> kXR_read (handle: 0x00000000, offset: 0, size: 1048576)
>>> [2020-07-08 13:38:47.022625 -0700][Error  ][File              ] 
>>> [0xf0b040@root:[log in to unmask]:1094//eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root?xrdcl.requuid=6730e10b-8b40-43bf-9d0a-75da982939e8] 
>>> Fatal file state error. Message kXR_read (handle: 0x00000000, offset: 0, 
>>> size: 1048576) returned with [ERROR] Invalid arguments
>>> 200708 13:38:47 241052 XrdPfc_File: error File::ProcessBlockResponse block 
>>> 0xff3440  0 error=-22 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root
>>> 200708 13:38:47 240995 XrdPfc_File: error File::Read() io 0xe30f50, block 
>>> 0 finished with error 22 invalid argument 
>>> eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root
>>> src/tcmalloc.cc:284] Attempt to free invalid pointer 0x313262003543620a
>>> 
>>> Note that while we get all these network errors at the start, cache still 
>>> got the stat info from the server (knows the size of the file).
>>> 
>>> I must admit I never test xcache with auth on :( I'll try it out now, 
>>> well, after lunch :)
>>> 
>>> Matevz
>>> 
>>>> Andy
>>>> 
>>>> 
>>>> On Wed, 8 Jul 2020, Matevz Tadel wrote:
>>>> 
>>>>> Yay, that was a journey ... but I can reproduce it now!
>>>>> 
>>>>> It is super strange this happens with xcache with authentication on only 
>>>>> ...
>>>>> this really should have no effect. I first tried without it and it 
>>>>> worked and
>>>>> then something rang a bell that you said so in the email :).
>>>>> 
>>>>> Andy, does this ring any bells for you? It looks like interaction 
>>>>> between
>>>>> server / client usage of X509 stuffe.
>>>>> 
>>>>> Anyway, I'm digging on on the xcache side ...
>>>>> 
>>>>> Cheers,
>>>>> Matevz
>>>>> 
>>>>> 
>>>>> 
>>>>> On 2020-07-08 07:41, Nikolai Hartmann wrote:
>>>>>> Hi Matevz,
>>>>>> 
>>>>>> I might have something like a "minimal failing example". Unfortunately
>>>>>> the problem only appears when authentication is required, so the 
>>>>>> example
>>>>>> will only work on a machine that has a valid host certificate and the
>>>>>> corresponding directory has to be bind-mounted into the container.
>>>>>> 
>>>>>> I uploaded my container image here:
>>>>>> 
>>>>>> https://urldefense.com/v3/__https://cloud.physik.lmu.de/index.php/s/RFC6Q89FBxxNMXF__;!!Mih3wA!S4S4O0y7f1Z5oNAgkr2EZ2J5683bZ5LRbG55GbcoHhyJTwOzaS2lABcIifddJxDGMy-N$ 
>>>>>> 
>>>>>> 
>>>>>> and made a directory structure (tar archive attached) to bind mount 
>>>>>> into
>>>>>> the container (and containing the minimal failing xcache config and a
>>>>>> script for starting gdb inside the container)
>>>>>> 
>>>>>> To reproduce, extract the archive, enter the directory and run (as
>>>>>> non-root user)
>>>>>> 
>>>>>> singularity run -B $(pwd)/data:/data -B $(pwd)/config:/etc/xrootd:ro -B
>>>>>> <hostkey-dir>:/etc/grid-security:ro <singularity-image>
>>>>>> 
>>>>>> where <hostkey-dir> is a directory that contains
>>>>>> 
>>>>>> hostkey.pem
>>>>>> hostcert.pem
>>>>>> vomsdir (will become X509_VOMS_DIR)
>>>>>> certificates (will become X509_CERT_DIR)
>>>>>> 
>>>>>> and <singularity-image> is the path to the singularity image.
>>>>>> 
>>>>>> That should run xrootd and the log should appear in
>>>>>> data/xrd/var/log/xrootd.log
>>>>>> 
>>>>>> I used this example to produce the failure:
>>>>>> 
>>>>>> xrdcp -f
>>>>>> root://lcg-lrz-xcache0.grid.lrz.de:1094//root://eospublic.cern.ch//eos/opendata/lhcb/AntimatterMatters2017/data/PhaseSpaceSimulation.root 
>>>>>> 
>>>>>> /dev/null
>>>>>> 
>>>>>> The simplest way to run gdb seemed to directly start xrootd with gdb.
>>>>>> This can be done with the script run_xcache_debug.sh in the attached
>>>>>> archive. Instead of the command above just use
>>>>>> 
>>>>>> singularity exec -B $(pwd)/data:/data -B $(pwd)/config:/etc/xrootd:ro 
>>>>>> -B
>>>>>> <hostkey-dir>:/etc/grid-security:ro <singularity-image>
>>>>>> ./run_xcache_debug.sh
>>>>>> 
>>>>>> Note: Before restarting, best delete the content of the data directory
>>>>>> since the bug also did not seem to occur when the file was already
>>>>>> cached (e.g after testing without authentication)
>>>>>> 
>>>>>> Sorry for the overly complicated reproducing steps, but since it only
>>>>>> happened when i authentication was enabled i didn't know how to do it
>>>>>> simpler. I hope it helps.
>>>>>> 
>>>>>> Thanks,
>>>>>> Nikolai
>>>>>> 
>>>>>> On 7/7/20 8:42 PM, Matevz Tadel wrote:
>>>>>>> Thanks Nikolai, I shall continue my investigation :)
>>>>>>> 
>>>>>>> Matevz
>>>>>>> 
>>>>>>> On 2020-07-06 23:59, Nikolai Hartmann wrote:
>>>>>>>> Hi Matevz,
>>>>>>>> 
>>>>>>>> Thanks a lot for looking into this.
>>>>>>>> 
>>>>>>>> - The crash seems to happen always when i make a request
>>>>>>>> - Currently prefetching is disabled
>>>>>>>> - Yes, i think it is direct proxy mode
>>>>>>>> - stack trace is attached
>>>>>>>> 
>>>>>>>> A similar setup seems to work for Ilija without issues with the 
>>>>>>>> xcaches
>>>>>>>> using slate - i tried to mimic that setup closely. Running xrootd 
>>>>>>>> from
>>>>>>>> this container image:
>>>>>>>> 
>>>>>>>> https://urldefense.com/v3/__https://gitlab.physik.uni-muenchen.de/Nikolai.Hartmann/xcache-singularity-lrz/-/blob/51d2da52829eb6d8ea377539884f337208141aca/xcache.singularity.def__;!!Mih3wA!SJibOzmy2P3rdD8Ut7m7gYp_bah2pQX2dR2V9U6xiTq9PoQtfjb_MHHDljpOV0aWvVYj$ 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> using this config
>>>>>>>> 
>>>>>>>> https://urldefense.com/v3/__https://gitlab.physik.uni-muenchen.de/Nikolai.Hartmann/xcache-singularity-lrz/-/blob/51d2da52829eb6d8ea377539884f337208141aca/etc/xrootd/xcache.cfg__;!!Mih3wA!SJibOzmy2P3rdD8Ut7m7gYp_bah2pQX2dR2V9U6xiTq9PoQtfjb_MHHDljpOVzHQF5CU$ 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> Cheers,
>>>>>>>> Nikolai
>>>>>>>> 
>>>>>>>> On 7/7/20 1:38 AM, Matevz Tadel wrote:
>>>>>>>>> Hi Nikolai,
>>>>>>>>> 
>>>>>>>>> I tried to reproduce it with current master in nearly all ways,
>>>>>>>>> with/without prefetching and with direct/forwarding mode. Also, with 
>>>>>>>>> std
>>>>>>>>> malloc and tcmalloc. No luck :(
>>>>>>>>> 
>>>>>>>>> Backtrace or core would help a lot at this point.
>>>>>>>>> 
>>>>>>>>> Cheers,
>>>>>>>>> Matevz
>>>>>>>>> 
>>>>>>>>> On 2020-07-03 00:54, Nikolai Hartmann wrote:
>>>>>>>>>> Hi,
>>>>>>>>>> 
>>>>>>>>>> I'm trying to upgrade to xrootd5 rc4 for our xcache server to
>>>>>>>>>> mitigate a
>>>>>>>>>> problem with dCache.
>>>>>>>>>> 
>>>>>>>>>> Now when i try to read a file through xcache it crashes with
>>>>>>>>>> "Attempt to
>>>>>>>>>> free invalid pointer". I attached the corresponding part of the 
>>>>>>>>>> log.
>>>>>>>>>> Any ideas?
>>>>>>>>>> 
>>>>>>>>>> Thanks,
>>>>>>>>>> Nikolai
>>>>>>>>>> 
>>>>>>>>>> ########################################################################
>>>>>>>>>> 
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>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>> 
>>>>>>> 
>>>>> 
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