A segfault was found

[ganker-z]

A segfault was found when i run lxcfs 4.0.7 with libfuse2.9.9, the backtrace is as follows

[ganker-z]

[ganker-z]

[stgraber]

@brauner what would we need to track this one down?

[brauner]

I have one wild guess but I need the output of ldd on the lxcfs binary and the liblxcfs.so libtool module, please.

[stgraber]

@ganker-z if this is still an issue for you, can you provide that information?

[brauner]

I would expect crashes like that when e.g. lxcfs is linked against fuse 2 and liblxcfs linked against fuse `3.

[ganker-z]

The above pictrue is the ldd output of lxcfs and libfuse

[stgraber]

The second ldd should be against liblxcfs.so not libfuse.so

[ganker-z]

ldd output of liblxcfs.so

[brauner]

Ah, damn. I forgot that we don't link liblxcfs.so against fuse. @ganker-z, is it possible for you to get me the liblxcfs.so binary?

[ganker-z]

liblxcfs.zip liblxcfs.so binary file

[ganker-z]

Ah, damn. I forgot that we don't link liblxcfs.so against fuse. @ganker-z, is it possible for you to get me the liblxcfs.so binary?

Is there any progress?

[brauner]

Do you have any access to the build flags used to build this version of liblxcfs? I need to find out what fuse version it was built with.

[brauner]

This could also be a fuse bug tbh since we don't make use of double-linked lists in lxcfs.

[ganker-z]

Do you have any access to the build flags used to build this version of liblxcfs? I need to find out what fuse version it was built with. I built it according to the method in the readme yum install fuse fuse-lib fuse-devel git clone git://github.com/lxc/lxcfs cd lxcfs ./bootstrap.sh ./configure make make install

[brauner]

Right, you built it yourself?

[brauner]

Can you show me:

pkg-config --libs fuse
pkg-config --libs fuse3

please?

[ganker-z]

Can you show me:

pkg-config --libs fuse
pkg-config --libs fuse3

please?

[ganker-z]

Right, you built it yourself?

yes

[ganker-z]

This could also be a fuse bug tbh since we don't make use of double-linked lists in lxcfs.

How to understand this sentence, is it double-linked libfuse by lxcfs?

[brauner]

This could also be a fuse bug tbh since we don't make use of double-linked lists in lxcfs.

How to understand this sentence, is it double-linked libfuse by lxcfs?

No. The first picture you pasted indicates that a double-linked list data structure got corrupted. We don't use double-linked lists as a data structure in lxcfs but fuse does. So there is a chance that you version of fuse has a bug.

[ganker-z]

This is the stack information at the time of the problem, exported through gdb There are two kinds of stack information, one is abort and the other is segmentation

[ganker-z]

This could also be a fuse bug tbh since we don't make use of double-linked lists in lxcfs.

How to understand this sentence, is it double-linked libfuse by lxcfs?

No. The first picture you pasted indicates that a double-linked list data structure got corrupted. We don't use double-linked lists as a data structure in lxcfs but fuse does. So there is a chance that you version of fuse has a bug.

Please take a look at the above comment，thanks

[mihalicyn]

No movement with this since 2021. I think we can close it until next reproducer.

Most likely it was libfuse bug, not the LXCFS one.

cc @stgraber