CI Flake: `test_renepay.py::test_limits`

[ddustin]

Looks like a memory leak inside renepay

(CI Log)

Potentially relevant commit 580c2f7
Potentially relevant PR #8798

lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay: MEMLEAK: 0x55c92426bfc8
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:   label=u8[]
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:   alloc:
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ccan/ccan/tal/tal.c:488 (tal_alloc_)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     common/sphinx.c:183 (serialize_onionpacket)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/renepay/routetracker.c:353 (create_onion)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/renepay/routetracker.c:410 (route_sendpay_request)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/renepay/mods.c:792 (waitblockheight_done)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/libplugin.c:1095 (handle_rpc_reply)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/libplugin.c:1398 (rpc_conn_read_response)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ccan/ccan/io/io.c:60 (next_plan)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ccan/ccan/io/io.c:422 (do_plan)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ccan/ccan/io/io.c:439 (io_ready)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ccan/ccan/io/poll.c:470 (io_loop)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/libplugin.c:2481 (plugin_main)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     plugins/renepay/main.c:477 (main)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ../sysdeps/nptl/libc_start_call_main.h:58 (__libc_start_call_main)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     ../csu/libc-start.c:360 (__libc_start_main_impl)
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:   parents:
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     struct route
lightningd-1 2026-06-25T16:51:08.373Z **BROKEN** plugin-cln-renepay:     struct pay_plugin

[ddustin]

@Lagrang3 this one looks like it's in your section of the codebase. Got any ideas or insights on this one?