ElementsProject / ElementsProject/lightning
CI Flake: `test_renepay.py::test_limits`
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Description
Looks like a memory leak inside renepay
([CI Log](https://github.com/ElementsProject/lightning/actions/runs/28180935282/job/83478094821?pr=9228))
Potentially relevant commit 580c2f78540449b3d5c13e4518391471fb1a197d
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
```
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