Dear Sawada-san,
28.04.2026 22:27, Masahiko Sawada wrote:
On Mon, Apr 27, 2026 at 11:00 AM Alexander Lakhin <[email protected]> wrote:
I've been puzzled by a buildfarm failure [1] with such symptoms for a while
and even reproduced it locally once, but couldn't gather more information
that time. But now that you have described the scenario, I can easily
reproduce the same test failure with:
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -206,6 +206,7 @@ ProcSignalInit(const uint8 *cancel_key, int cancel_key_len)
if (cancel_key_len > 0)
memcpy(slot->pss_cancel_key, cancel_key, cancel_key_len);
slot->pss_cancel_key_len = cancel_key_len;
+pg_usleep(10000);
pg_atomic_write_u32(&slot->pss_pid, MyProcPid);
Thank you for testing this.
I've attached a patch to address the issue. I haven't verified it
across all versions yet, but I suspect it exists in the stable
branches as well...
Thank you for the fix! It works for me too.
I was wondering why is that failure the only one of this kind on buildfarm
(in last two years, at least), so I've tried to reproduce it on
REL_18_STABLE... and failed.
Then I've bisected it on the master branch and found (your) commit that
introduced this behavior: 67c20979c from 2025-12-23.
Best regards,
Alexander
