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sk-inet: add message how to disable MPTCP in Go

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With Go version 1.24, ListenConfig now uses MPTCP by default [1].
Checkpoint/restore for this protocol is not currently supported
and adding support requires kernel changes that are not trivial
to implement. As a result, checkpointing of many containers that
run Go programs is likely to fail with the following error [2]:

(00.026522) Error (criu/sk-inet.c:130): inet: Unsupported proto 262 for socket 2f9bc5

This patch adds a message with suggested workaround for this problem.

[1] https://go.dev/doc/go1.24#netpkgnet
[2] https://github.com/checkpoint-restore/criu/issues/2655

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
This commit is contained in:
Radostin Stoyanov 2025-05-07 14:06:55 +01:00 committed by Andrei Vagin
parent 69f990d88b
commit 0e9d0767fb
1 changed files with 2 additions and 0 deletions
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criu/sk-inet.c
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@ -128,6 +128,8 @@ static int can_dump_ipproto(unsigned int ino, int proto, int type)
break;
default:
pr_err("Unsupported proto %d for socket %x\n", proto, ino);
if (proto == IPPROTO_MPTCP)
pr_err("For Go programs, consider using \"GODEBUG=multipathtcp=0\" to disable MPTCP\n");
return 0;
}