Teardown flagged the FUSE worker pool closed but never joined it, so the
process could drop the tokio runtime while a worker was still inside a
job — which is where 2026-09-18's "A Tokio 1.x context was found, but it
is being shutdown" panic came from. `Workers::stop_and_join` now waits
for the jobs in flight, bounded at 10 s so a worker wedged on the network
cannot hold the stop the user asked for; what is still stuck is named in
the log and shutdown continues around it.
The queues stay unbounded — the only caller that could feel backpressure
is fuser's dispatch loop, and blocking that is the stall the pool exists
to avoid — but a lane now logs its depth every 256 jobs, so a queue that
keeps climbing is visible before it is reported as a slow mount.
Documents the hang as B91, with the journal evidence, what made it
undiagnosable, and the candidates the evidence does not yet separate.
On 2026-09-18 the daemon hung: 43 minutes of CPU over 20 hours, 5.2 GiB
resident, silent from 17:10 until a manual restart the next day, and no
panic. Nothing in the journal said what it had been waiting on, and
nothing in the daemon could be asked.
- The worker pool publishes per-thread state: whether the thread is busy,
how long it has been in that state, and the label of the job in hand.
Every FUSE handler that hands work to the pool now names its job
(`read`, `lookup`, `rename`), so a stuck worker is named rather than
merely counted. Queue depths and per-lane completion counts are
mirrored outside the queue lock.
- `Request::Diagnostics` / `pdfs diagnostics` reports those, plus
resident size, the control handler count against its limit, the
in-flight control requests with their ages, and the pending-op count.
- Built to answer while the daemon is wedged: atomics and `try_lock`
only, and the one field that needs the database reads it on a throwaway
thread with a 500 ms deadline.
relocate() called forget(), dropping the node's by_uid mapping, so
the re-enumeration assigned a fresh inode. The kernel had already
carried the renamed dentry onto the old one and holds it for the
entry TTL, so lookup/getattr/opendir resolved to an inode entries
no longer held and returned ENOENT — while readdir walked children
and reported the new inode. A renamed directory listed in its
parent but could not be entered until the TTL expired.
Rewrite the node in place and invalidate both parents' listings
instead. Also stops the moved node's DB row being deleted and
recreated on every move, which the B1 data-loss fix worked around
nvrl