NetworkManager v1.46.0 freezes

[Beniamino Galvani]

On Tue, Jan 14, 2025 at 11:56:00AM +0100, Sven Schwermer wrote:
> Hi,
> 
> We're using NetworkManager v1.46.0 on an embedded device. Recently we
> have started to observe the NetworkManager daemon not responding to
> dbus message calls on one device, e.g. GetProperty calls will just
> hang. Similarly, just running nmcli (no options or arguments) hangs
> forever. The daemon does not log anything that would explain this (at
> INFO level) with the last message being about renewing the Ethernet
> DHCP lease. We have dumped the core of the daemon when it was in the
> hung state:
> 
> (gdb) info threads
>   Id   Target  Id               Frame
> * 1    LWP 192 "NetworkManager" __libc_do_syscall () at
> ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
>   2    LWP 208 "gdbus"          syscall () at
> ../sysdeps/unix/sysv/linux/arm/syscall.S:37
>   3    LWP 206 "pool-spawner"   syscall () at
> ../sysdeps/unix/sysv/linux/arm/syscall.S:37
>   4    LWP 205 "gmain"          __libc_do_syscall () at
> ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
> 
> I can't see anything out of the ordinary here. Is there anything else
> we can do to troubleshoot this further? For now, we have enabled
> debug-level logs and hope to reproduce the issue. Is there perhaps a
> known issue that would explain the described issue?

Hi,

it's not a known issue. I would start investigating this by analyzing
the backtrace of thread 1 in gdb, and looking at the log at "trace"
level of NM just before the freeze happens.

Beniamino
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