lightningd: fix access to bcli plugin once it's freed. #8687
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``` 2025-11-13T07:47:16.5733646Z Valgrind error file: valgrind-errors.46048 2025-11-13T07:47:16.5733739Z ==46048== Invalid read of size 8 2025-11-13T07:47:16.5733869Z ==46048== at 0x2F2B47: strmap_add_ (strmap.c:69) 2025-11-13T07:47:16.5734014Z ==46048== by 0x212066: plugin_request_send (plugin.c:2509) 2025-11-13T07:47:16.5734160Z ==46048== by 0x18FA54: bitcoin_plugin_send (bitcoind.c:123) 2025-11-13T07:47:16.5734329Z ==46048== by 0x190AA7: bitcoind_getrawblockbyheight_ (bitcoind.c:537) 2025-11-13T07:47:16.5734490Z ==46048== by 0x1917E3: bitcoind_getfilteredblock_ (bitcoind.c:857) 2025-11-13T07:47:16.5734615Z ==46048== by 0x1BE2DC: get_txout (gossip_control.c:106) 2025-11-13T07:47:16.5734750Z ==46048== by 0x1BE88A: gossip_msg (gossip_control.c:212) 2025-11-13T07:47:16.5734860Z ==46048== by 0x21BD60: sd_msg_read (subd.c:560) 2025-11-13T07:47:16.5734962Z ==46048== by 0x2E416D: next_plan (io.c:60) 2025-11-13T07:47:16.5735074Z ==46048== by 0x2E4DC3: do_plan (io.c:422) 2025-11-13T07:47:16.5735175Z ==46048== by 0x2E4E2A: io_ready (io.c:439) 2025-11-13T07:47:16.5735294Z ==46048== by 0x2E727E: io_loop (poll.c:455) 2025-11-13T07:47:16.5735464Z ==46048== Address 0x5ec7518 is 216 bytes inside a block of size 288 free'd 2025-11-13T07:47:16.5735692Z ==46048== at 0x484B27F: free (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so) 2025-11-13T07:47:16.5735798Z ==46048== by 0x2F767C: del_tree (tal.c:456) 2025-11-13T07:47:16.5735902Z ==46048== by 0x2F795D: tal_free (tal.c:532) 2025-11-13T07:47:16.5736018Z ==46048== by 0x20C30D: plugin_kill (plugin.c:468) 2025-11-13T07:47:16.5736147Z ==46048== by 0x20D0EE: plugin_conn_finish (plugin.c:853) 2025-11-13T07:47:16.5736265Z ==46048== by 0x2E6AF6: destroy_conn (poll.c:246) 2025-11-13T07:47:16.5736397Z ==46048== by 0x2E6B1A: destroy_conn_close_fd (poll.c:252) 2025-11-13T07:47:16.5736504Z ==46048== by 0x2F6FC9: notify (tal.c:246) 2025-11-13T07:47:16.5736602Z ==46048== by 0x2F75AA: del_tree (tal.c:437) 2025-11-13T07:47:16.5736707Z ==46048== by 0x2F795D: tal_free (tal.c:532) 2025-11-13T07:47:16.5736812Z ==46048== by 0x2E4FF6: io_close (io.c:496) 2025-11-13T07:47:16.5736920Z ==46048== by 0x2E72A5: io_loop (poll.c:459) ``` Changelog-None: exposed by recent plugin changes. Signed-off-by: Rusty Russell <[email protected]>
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As seen in CI:
Changelog-None: exposed by recent plugin changes.