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7 Commits

Author SHA1 Message Date
Rusty Russell
fd64bb114b lightningd: fix bogus memleak report. 
We do our own leak detection on a reply from a subd, but the reply
code set subd->conn to NULL (saving it temporarily, in case the subd
is freed), resulting in it being seen as a leak:

```
lightningd-2 2026-01-12T14:11:12.677Z DEBUG   0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518-channeld-chan#1: billboard perm: Reconnected, and reestablished.
lightningd-2 2026-01-12T14:11:12.677Z DEBUG   0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518-channeld-chan#1: billboard: Channel ready for use. Shutdown messages exchanged.
lightningd-1 2026-01-12T14:11:12.705Z DEBUG   022d223620a359a47ff7f7ac447c85c46c923da53389221a0054c11c1e3ca31d59-closingd-chan#1: pid 100718, msgfd 87
lightningd-1 2026-01-12T14:11:12.705Z DEBUG   022d223620a359a47ff7f7ac447c85c46c923da53389221a0054c11c1e3ca31d59-channeld-chan#1: Status closed, but not exited. Killing
...
lightningd-1 2026-01-12T14:11:32.546Z **BROKEN** lightningd: MEMLEAK: 0x55f61eb4d848
lightningd-1 2026-01-12T14:11:32.546Z **BROKEN** lightningd:   label=ccan/ccan/io/io.c:92:struct io_conn
lightningd-1 2026-01-12T14:11:32.546Z **BROKEN** lightningd:   alloc:
lightningd-1 2026-01-12T14:11:32.840Z **BROKEN** lightningd:     ccan/ccan/tal/tal.c:488 (tal_alloc_)
lightningd-1 2026-01-12T14:11:32.845Z **BROKEN** lightningd:     ccan/ccan/io/io.c:92 (io_new_conn_)
lightningd-1 2026-01-12T14:11:32.845Z **BROKEN** lightningd:     lightningd/subd.c:785 (new_subd)
lightningd-1 2026-01-12T14:11:32.845Z **BROKEN** lightningd:     lightningd/subd.c:839 (new_channel_subd_)
lightningd-1 2026-01-12T14:11:32.846Z **BROKEN** lightningd:     lightningd/channel_control.c:1714 (peer_start_channeld)
lightningd-1 2026-01-12T14:11:32.847Z **BROKEN** lightningd:     lightningd/peer_control.c:1390 (connect_activate_subd)
lightningd-1 2026-01-12T14:11:32.847Z **BROKEN** lightningd:     lightningd/peer_control.c:1516 (peer_connected_hook_final)
lightningd-1 2026-01-12T14:11:32.847Z **BROKEN** lightningd:     lightningd/plugin_hook.c:243 (hook_done)
lightningd-1 2026-01-12T14:11:32.847Z **BROKEN** lightningd:     lightningd/plugin_hook.c:343 (plugin_hook_call_next)
lightningd-1 2026-01-12T14:11:32.847Z **BROKEN** lightningd:     lightningd/plugin_hook.c:299 (plugin_hook_callback)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     lightningd/plugin.c:701 (plugin_response_handle)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     lightningd/plugin.c:790 (plugin_read_json)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     ccan/ccan/io/io.c:60 (next_plan)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     ccan/ccan/io/io.c:422 (do_plan)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     ccan/ccan/io/io.c:439 (io_ready)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     ccan/ccan/io/poll.c:470 (io_loop)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     lightningd/io_loop_with_timers.c:22 (io_loop_with_timers)
lightningd-1 2026-01-12T14:11:32.851Z **BROKEN** lightningd:     lightningd/lightningd.c:1492 (main)
lightningd-1 2026-01-12T14:11:32.852Z **BROKEN** lightningd:     ../sysdeps/nptl/libc_start_call_main.h:58 (__libc_start_call_main)
lightningd-1 2026-01-12T14:11:32.852Z **BROKEN** lightningd:     ../csu/libc-start.c:360 (__libc_start_main_impl)
lightningd-1 2026-01-12T14:11:32.852Z **BROKEN** lightningd:   parents:
lightningd-1 2026-01-12T14:11:32.852Z **BROKEN** lightningd:     lightningd/lightningd.c:108:struct lightningd
lightningd-1 2026-01-12T14:11:32.853Z DEBUG   lightningd: channel_gossip: no longer in startup mode
lightningd-1 2026-01-12T14:11:32.856Z DEBUG   hsmd: new_client: 1
```

The workaround is to do our own leak detection on a timer (making the
conn notleak() would leave us open to a real leak in future!).

We also move the `struct leak_detect` definition inside the C file
where it belongs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2026-01-14 15:41:45 +10:30
Rusty Russell
00bb6f07d7 lightningd: simplify memleak code. 
Instead of doing this weird chaining, just call them all at once and
use a reference counter.

To make it simpler, we return the subd_req so we can hang a destructor
off it which decrements after the request is complete.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2022-03-10 09:40:09 +10:30
Rusty Russell
ea30c34d82 cleanup: remove unneeded includes in header files. 
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2021-09-17 09:43:22 +09:30
Rusty Russell
1f7fb33563 common/memleak: hoist strmap helper from out of lightningd/memdump.c 
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2021-09-08 19:11:47 +02:00
Rusty Russell
e5c80f63d7 lightningd: add code to search strmaps for memleak detection. 
Didn't put this in common/memleak because only lightningd currently needs it
(as of next patch).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2019-02-07 20:33:50 +00:00
Rusty Russell
d3ea9bf8bf channeld: wire up dev_memleak. 
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2018-11-22 05:15:42 +00:00
Rusty Russell
a42c8bfb38 openingd: wire up dev_memleak. 
This is a bit different from the other cases: we need to iterate through
the peers and ask all the ones in openingd.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 2018-11-22 05:15:42 +00:00