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Re: Having ten thousands of mount bind causes various processes to go into loops

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On 19/06/2024 16:27, Julien Petit wrote:
>> Does it have some logic to avoid descending into bind mounts? Maybe I am
>> wrong with my expectation that it does not use anything besides st_dev
>> from stat result. It may be promising case to demonstrate the issue in a
>> way independent of systemd and sandboxing. You can obtain command line
>> arguments. Attach to its mount namespace and inspect content of its
>> /proc/<PID>/mounts or mountinfo. The next step would be to profile or at
>> least to trace a process.
> 
> I'm not sure i understand you there.

It was intended to express my surprise that "find" is affected. I may 
expect some bugs in udisksd or PHP related to number of entries in 
"mounts" or "mountinfo" /proc files, but find is much more simple and 
likely more convenient for debugging of the issue. (Actually I am even 
more surprised by presence of udisksd on a cloud platform with sharing 
files among virtual users.)

On 20/06/2024 04:18, Julien Petit wrote:
>>> However do you need shared subtrees?
>> I'm gonna test the effect of setting them to private.
> 
> This doesn't seem to fix the problem either

Sorry, but without any details what you have actually tried, it adds 
nothing to the following kind of summary: "Despite there are enough 
projects that actively use bind mounts, some person faced some obscure 
issue. The tool might be used in a wrong way".

User and mount namespaces caused some challenges in respect to bind 
mounts. Personally I have not convinced that changes in kernel may 
contain some regression. However nowadays bind mounts perhaps should be 
treated with more care.

It seems nobody on this list is motivated enough to actively participate 
in debugging starting from the script you posted. You may ask in other 
communities.

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Re: Having ten thousands of mount bind causes various processes to go  into loops Julien Petit <julien@nethik.fr> - 2024-06-19 11:50 +0200
  Re: Having ten thousands of mount bind causes various processes to go  into loops Max Nikulin <manikulin@gmail.com> - 2024-06-22 06:20 +0200

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