[Bug 297791] kern: panic in inotify_log(): vp->v_pollinfo == NULL

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297791

            Bug ID: 297791
           Summary: kern: panic in inotify_log(): vp->v_pollinfo == NULL
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

FreeBSD 15.0-RELEASE releng/15.0-n280995-7aedc8de6446 GENERIC amd64
(still reproducible on later 15 kernels I rebuild myself).

Panic / page fault in inotify_log() at:

    mtx_lock(&vp->v_pollinfo->vpi_lock);

kgdb: vp->v_pollinfo == NULL.

Repro on this machine (KDE Plasma, non-root user):
- start a normal Plasma session
- click the digital clock widget, open the calendar, click around
- more likely with inotify-heavy apps running (Cursor / other Electron)

Without a local change the kernel panics within a few minutes of interactive
use.
I am not claiming a root cause. inotify_log() assumes v_pollinfo is non-NULL.
On this host the desktop session runs in a jail; I do not know whether that
matters.

Workaround only (not proposed as a correct fix). It stops the panic:

--- a/sys/kern/vfs_inotify.c
+++ b/sys/kern/vfs_inotify.c
@@ inotify_log
+       if (vp->v_pollinfo == NULL)
+               return;
        mtx_lock(&vp->v_pollinfo->vpi_lock);

I mailed freebsd-bugs@ on 2026-01-10 (Message-ID
<[email protected]>) asking whether to file a
PR; no replies. I can attach a kgdb backtrace and more vnode fields if useful.

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