[Pkg-rust-maintainers] Bug#1144050: virtiofsd crashes with SIGSYS (seccomp) on ther first request after a client connects

[Michael Tokarev]

On 8/10/26 12:49, Jonas Andradas wrote:
> Package: virtiofsd
> Version: 1.14.0-2
> Severity: normal
> X-Debbugs-Cc: j.andradas at gmail.com
> 
> Dear Maintainer,
> 
> virtiofsd crashes with SIGSYS (seccomp) on the first request after a
> client connects, making any VM with a virtiofs share fail to start.
> This has been 100% reproducible on my host, standalone, with no libvirt
> involved.
> 
> virtiofsd accepts the vhost-user socket connection successfully, then
> is killed by its own seccomp filter (SIGSYS) apparently while calling
> getsockopt(2) (syscall 55) — likely a SO_PEERCRED check on the newly
> accepted socket, immediately after "Client connected, servicing
> requests".

Do you have kernel message(s) about the issue?  It should report which
syscall it disliked.

The issue is most likely not due to virtiofsd itself but due to a
recompile with more recent rustc or other crates, which now use more
syscalls when virtiofsd originally planned for.  I mean, it is very
likely that a rebuild of 1.14.0-1 in current environment will also
be buggy.

Thanks,

/mjt