Thanks for the follow-up. Both checks are resolved, and they narrow it to one
mechanism.
- /etc/vpnc/disconnect.d does not exist on that machine (no /etc/vpnc at all),
so the sourced-hook-exit path is ruled out.
- Your norm is a single Ctrl-C; a second press on Mar 30 can be neither
confirmed nor ruled out, and with no saved terminal output the "Failed to spawn
script" line is not checkable either.
That leaves the teardown group-signal race as the only mechanism consistent
with the record. In 9.12 the disconnect script is forked into openconnect's own
process group (no setpgid; fixed upstream by c0ed1606, merged 2025-07-26, first
released in v9.20/v9.21). A second Ctrl-C during teardown delivers SIGINT to
the group again: the plain-sh script (no traps) dies mid-restore, waitpid()
returns EINTR (no SA_RESTART), openconnect reports the script failure and
exits, and the VPN route and VPN DNS are left behind. Note the +local1
while-loop only guards del_vpngateway_route; RESTORERESOLVCONF runs after it,
so a script that failed partway would have left DNS restored. On Mar 30 both
survived, which means the script never finished: killed, not failed.
Honest caveat: since the problem has never been reproduced, I cannot prove the
second Ctrl-C happened. But it is the only mechanism that fits everything on
record, and it is fixed upstream.
Status: sid 9.21-5 already carries the fix; trixie 9.12-3+deb13u2 does not. The
backport is one small hunk (setpgid after fork in script_config_tun):
--- a/script.c
+++ b/script.c
@@ -676,7 +676,10 @@ int script_config_tun(struct openconnect_info *vpninfo,
const char *reason)
return 0;
pid = fork();
- if (!pid) {
+ if (pid == 0) {
/* Child */
+ if (setpgid(0, 0) < 0)
+ perror(_("setpgid"));
+
char *script = openconnect_utf8_to_legacy(vpninfo,
vpninfo->vpnc_script);
Adoption of openconnect is in progress (wnpp #1144686), so this can land with
the first maintainer upload; I also have an ocserv-based autopkgtest plan to
assert route+DNS restore after SIGINT. My suggestion: keep the bug open until
the backport reaches trixie. Closing fixed-upstream would also be defensible
since sid already carries the fix. Your call as reporter.
Ivo
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