#1829 Hang/freeze with filename length = 22 characters (including .jpg or .png extension)

[Anonymous]

I found this strange behaviour when I tried to access, through Nautilus, a folder mounted with mtp from my Samsung Android Device: if the folder contains an image file named 20180915_180351(0).jpg, Nautilus hangs, freezes, doesn't respond, and I have to unplug the phone to have it back working.

This is particularly annoying because Android sometimes creates files with name YYYYMMDD_HHMMSS(n).jpg, with n=0, 1, 2, ... when more than one photo are taken in the same 1-second time interval.

I think it is a libmtp problem and not strictly nautilus-related, because the same problem triggers if I try to browse the directory using the command line on the device storage mounted with jmtpfs.

Some trials pointed out that the problem happens with image files having a filename length of exactly 22 characters (i.e. "123456789012345678.jpg"), and a jpg or png file extension. I have not been able to reproduce the bug in other circumstances (despite I tried many). Here is the log of my tests:

• Does it depend on the "(" or ")" characters?
• 20180915_183051(0).jpg DOES NOT WORK
• Same image renamed to:
• 20180915_183051(x).jpg doesn't work
• 20180915_183051(0.jpg works
• 20180915_1830510).jpg works
• 20180915_183051(00).jpg works

• 20180915_183051().jpg works
  ...so, the answer is NO.

• Does it depend on the filename length?

• 20180915_183051(0).jpg DOES NOT WORK
• Same image renamed to:
• Test(0).jpg works.
• 1234567890(0).jpg works.
• 12345678901234567890(0).jpg works
• 12345678_012345(0).jpg DOES NOT WORK
• 123456789012345(0).jpg DOES NOT WORK
• 1234567890123456(0).jpg WORKS
• 12345678901234(0).jpg WORKS
• 123456789012345678.jpg DOES NOT WORK
• 1234567890123456789012 works

• 123456789012345678.012 works
  ...so it seems the answer is YES, but the last two's suggested me also to try:

• Does it depend on the extension itself? (not the file content type)

• 123456789012345678.txt (text file) works
• The above file renamed to .jpg does not work;
• 123456789012345678.png (image file) does not work;
• The above file renamed to .txt works;
• The above file renamed to .jpg does not work.
  ...so, it seems it does.

Other thoughts:

Does it depend on file size? Does not seem so:
2.0 MB works
2.4 MB doesn't work
5.0 MB works

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Steps to reproduce:
- On the mobile device, create a folder "test" and copy an image file "123456789012345678.jpg" inside it;
- Connect the mobile device, allow access to phone data;
- On the PC, open Nautilus and navigate to the "test" folder

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Expected behaviour:
The file is shown

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Real behaviour:
The file is not shown; Nautilus hangs/freezes until the device is unplugged. Sometimes an error pops up "libmtp error: unknown error / unmanaged error"; sometimes "could not get object handles".

Running libmtp libmtp-1.1.14 on Fedora 28 with a Samsung J7.

Of course, let me know if I may provide more info or test results.

[angus73]

Sorry, I am the reporter but reported it without loggin in first.
Someone please correct it, if it's useful (or may I report it again?)

[angus73]

Well, I created https://sourceforge.net/p/libmtp/bugs/1830/ so this one could be closed and deleted. Sorry for trouble.

[Marcus Meissner]

dup