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BUG/MAJOR: Revert "MEDIUM: mux-quic: add BUG_ON if sending on locally closed QCS"

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This reverts commit 235e8f1afd.

Prior to the above commit, snd_buf callback for QUIC MUX was able to
deal with data even after stream closure. The excess was simply
discarded, as no STREAM frame can be emitted after FIN/RESET_STREAM.
This code was later removed and replaced by a BUG_ON() to ensure snd_buf
is never called after stream closure.

However, this approach is too strict. Indeed, there is nothing in the
haproxy stream architecture which forbids this scheduling, in part
because QUIC MUX is the sole responsible of the stream closure. As such,
it is preferable to revert to the old code to prevent any triggering of
a BUG_ON() failure.

Note that nego_ff does not implement data draining if called after
stream closure. This will be done in a future patch.

Thanks to Mike Walker for his investigation on the subject.

This must be backported up to 2.8.
This commit is contained in:
Amaury Denoyelle 2026-02-16 16:41:50 +01:00
parent 747ff09818
commit f3003d1508
3 changed files with 27 additions and 6 deletions
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1
include/haproxy/qmux_http.h
View file

@ -13,6 +13,7 @@ int qcs_http_handle_standalone_fin(struct qcs *qcs);
size_t qcs_http_snd_buf(struct qcs *qcs, struct buffer *buf, size_t count,
char *fin);
size_t qcs_http_reset_buf(struct qcs *qcs, struct buffer *buf, size_t count);
#endif /* USE_QUIC */

12
src/mux_quic.c
View file

@ -4077,9 +4077,6 @@ static size_t qmux_strm_snd_buf(struct stconn *sc, struct buffer *buf,
TRACE_ENTER(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
/* Sending forbidden if QCS is locally closed (FIN or RESET_STREAM sent). */
BUG_ON(qcs_is_close_local(qcs) || (qcs->flags & QC_SF_TO_RESET));
/* stream layer has been detached so no transfer must occur after. */
BUG_ON_HOT(qcs->flags & QC_SF_DETACH);
@ -4090,6 +4087,12 @@ static size_t qmux_strm_snd_buf(struct stconn *sc, struct buffer *buf,
goto end;
}
/* Cannot emit data after FIN/RESET_STREAM, drain extra payload. */
if (qcs_is_close_local(qcs) || (qcs->flags & QC_SF_TO_RESET)) {
ret = qcs_http_reset_buf(qcs, buf, count);
goto end;
}
if (LIST_INLIST(&qcs->el_buf)) {
TRACE_DEVEL("leaving on no buf avail", QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
goto end;
@ -4145,9 +4148,6 @@ static size_t qmux_strm_nego_ff(struct stconn *sc, struct buffer *input,
TRACE_ENTER(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
/* Sending forbidden if QCS is locally closed (FIN or RESET_STREAM sent). */
BUG_ON(qcs_is_close_local(qcs) || (qcs->flags & QC_SF_TO_RESET));
/* stream layer has been detached so no transfer must occur after. */
BUG_ON_HOT(qcs->flags & QC_SF_DETACH);

20
src/qmux_http.c
View file

@ -102,3 +102,23 @@ size_t qcs_http_snd_buf(struct qcs *qcs, struct buffer *buf, size_t count,
return ret;
}
/* QUIC MUX snd_buf reset. HTX data stored in <buf> of length <count> will be
* cleared. This can be used when data should not be transmitted any longer.
*
* Return the size in bytes of cleared data.
*/
size_t qcs_http_reset_buf(struct qcs *qcs, struct buffer *buf, size_t count)
{
struct htx *htx;
TRACE_ENTER(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
htx = htx_from_buf(buf);
htx_reset(htx);
htx_to_buf(htx, buf);
TRACE_LEAVE(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
return count;
}