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fix(v4.0.0): a node blocked at a port with no one on it is given an error, not left there

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A node writing to a node that was stuck, and was then killed, stayed
blocked for ever: killing a stuck node could cost its neighbours.  And on
the hosted and bare-metal products a write to an empty port, 5 7 PORT!,
ended the program with "the node stopped".

Now a node that can take an error, blocked writing to or reading from one
port that nothing is wired to -- nothing ever was, or what was there has
been killed or the wire cut -- has error 18, No one on that port, raised
on it and goes on.  A bare node waits as on the fabric; so does a node
whose neighbour is asleep, and one reading "any port".

test_host_unit.c: Hera kills node 14 while node 12 is blocked writing to
it.  It failed first: 12 stayed blocked.  test_fabric.c: a bare node still
waits.  hosted-check types 5 7 PORT! and goes on; it failed first too.

make -C v4 test, sanitize and hosted-check pass; amd64, aarch64 and
riscv64 boot, POST 538 of 538, dict_hash 0x5f0a949a6fc8ef2b on all six:
logs/20261007-121743, -122008, -122337.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-07 12:25:35 -04:00
co-authored by Claude Opus 5.5
parent 18adf59091
commit bc6deab3f5
17 changed files with 609 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
v4/system/boot.c
+5 -1
View File
@@ -139,13 +139,17 @@ static int run_line(const v4_boot *b, const char *text, unsigned len, char *keep
}
continue;
}
if (n->asking) return V4_BOOT_LINE_STOPPED; /* a port with nothing on it */
if (n->asking) { /* a port with no one on it: an error on the node */
if (!v4_node_port_gone(n, V4_ERROR_NO_ONE)) return V4_BOOT_LINE_STOPPED;
continue;
}
if (n->reading && !n->given) {
if (sent < out.count && (n->read_port == CONSOLE_PORT || n->read_port == V4_PORT_ANY)) {
v4_node_port_give(n, CONSOLE_PORT, out.word[sent++]); /* a word of the message to the node */
continue;
}
if (n->read_port != CONSOLE_PORT && n->read_port != KERNEL_PORT && v4_node_port_gone(n, V4_ERROR_NO_ONE)) continue; /* reading one port, with no one on it */
return V4_BOOT_LINE_STOPPED; /* waiting for what will not come */
}
if (v4_image_waiting(n, b->im)) { /* the text is reading the keyboard */