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BUG/MEDIUM: peers: make "show peers" more careful about partial initialization

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Since 2.6 with commit 34e4085f8 ("MEDIUM: peers: Balance applets across
threads") the initialization of a peers appctx may be postponed with a
wakeup, causing some partially initialized appctx to be visible. The
"show peers" command used to only care about peers without appctx, but
now it must also take care of those with no stconn, otherwise it can
occasionally crash while dumping them.

This fix must be backported to 2.6. Thanks to Patrick Hemmer for
reporting the problem.
This commit is contained in:
Willy Tarreau 2023-01-12 17:09:34 +01:00
parent 6be8d09a61
commit 03926129b0
1 changed files with 8 additions and 0 deletions
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8
src/peers.c
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@ -3898,6 +3898,14 @@ static int peers_dump_peer(struct buffer *msg, struct appctx *appctx, struct pee
peer->appctx->t ? peer->appctx->t->calls : 0);
peer_cs = appctx_sc(peer->appctx);
if (!peer_cs) {
/* the appctx might exist but not yet be initialized due to
* deferred initialization used to balance applets across
* threads.
*/
goto table_info;
}
peer_s = __sc_strm(peer_cs);
chunk_appendf(&trash, " state=%s", sc_state_str(sc_opposite(peer_cs)->state));