[Bug 290039] syncache_drop() coredumps 15.0-ALPHA4-ish

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 290039] core under load 15.0-ALPHA4-ish"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 07 Oct 2025 18:26:14 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290039

--- Comment #2 from David Gilbert <dave@daveg.ca> ---
This is getting fairly annoying.  Host has real internet address.  Seems to be
required to replicate.

The code in syncache_insert says:

0cd22970019e2efa5e98ad5671c454bd420a51e1

                sc2 = TAILQ_LAST(&sch->sch_bucket, sch_head);
                sch->sch_last_overflow = time_uptime;
                syncache_drop(sc2, sch);

and sc2 ends up being 0x0.

Question: what is sch_head?

Question: why does sc2 == 0x0?

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