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renepay: reduce minimum "known" if it proves incorrect.

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There's a fascinating bug report which suggests this happens on local channels,
implying spendable_msat is wrong?

See-also: #6567
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2023-08-18 17:13:25 +09:30
parent 40bb22b9ed
commit 685c413b61
1 changed files with 9 additions and 1 deletions
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10
plugins/renepay/flow.c
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@ -178,7 +178,15 @@ void chan_extra_cannot_send(
x = AMOUNT_MSAT(0); x = AMOUNT_MSAT(0);
} }
ce->half[dir].known_min = amount_msat_min(ce->half[dir].known_min,x); /* If we "knew" the capacity was at least this, we just showed we're wrong! */
if (amount_msat_less_eq(x, ce->half[dir].known_min)) {
debug_paynote(p, "Expected scid=%s, dir=%d min %s, but %s failed! Setting min to 0",
type_to_string(tmpctx,struct short_channel_id,&scid),
dir,
type_to_string(tmpctx,struct amount_msat,&ce->half[dir].known_min),
type_to_string(tmpctx,struct amount_msat,&x));
ce->half[dir].known_min = AMOUNT_MSAT(0);
}
ce->half[dir].known_max = amount_msat_min(ce->half[dir].known_max,x); ce->half[dir].known_max = amount_msat_min(ce->half[dir].known_max,x);
debug_paynote(p,"Update chan knowledge scid=%s, dir=%d: [%s,%s]", debug_paynote(p,"Update chan knowledge scid=%s, dir=%d: [%s,%s]",