Hi Christophe, On Sun, Aug 17, 2025 at 05:54:27PM +0200, Christophe Leroy wrote: > Le 17/08/2025 à 01:33, Phil Sutter a écrit : > > [Vous ne recevez pas souvent de courriers de p...@nwl.cc. D?couvrez > > pourquoi ceci est important ? https://aka.ms/LearnAboutSenderIdentification > > ] > > > > Hi, > > > > I admittedly didn't fully analyze the cause, but on my system a call to: > > > > # insmod /lib/module/$(uname -r)/kernel/net/netfilter/nf_conntrack_ftp.ko > > > > fails with -EEXIST (due to a previous call to 'nfct add helper ftp inet > > tcp'). A call to: > > > > # modprobe nf_conntrack_ftp > > > > though returns 0 even though module loading fails. Is there a bug in > > modprobe error status handling? > > > > Read the man page : https://linux.die.net/man/8/modprobe > > In the man page I see: > > Normally, modprobe will succeed (and do nothing) if told to > insert a module which is already present or to remove a module which > isn't present.
This is not a case of already inserted module, it is not loaded before the call to modprobe. It is the module_init callback nf_conntrack_ftp_init() which returns -EEXIST it received from nf_conntrack_helpers_register(). Can't user space distinguish the two causes of -EEXIST? Or in other words, is use of -EEXIST in module_init callbacks problematic? Cheers, Phil
