[Bug 296835] kern: coredump of a process with many EVFILT_VNODE knotes hangs for hours, process unkillable (SIGKILL pending), holds fd table lock (NT_PROCSTAT_KQUEUES note generation)

[email protected] Fri, 31 Jul 2026 15:55:54 +0000

Newsgroups	gmane.os.freebsd.bugs
Message-ID	<[email protected]/bugzilla/>

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D296835

--- Comment #3 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=3Dff97443beef614a12652cb96ccebe95e9=
046e82a

commit ff97443beef614a12652cb96ccebe95e9046e82a
Author:     Abdelkader Boudih <[email protected]>
AuthorDate: 2026-07-31 15:46:38 +0000
Commit:     Adrian Chadd <[email protected]>
CommitDate: 2026-07-31 15:46:45 +0000

    kqueue: do not buffer the whole knote report when sizing it

    kern_proc_kqueues_out() reported into an intermediate sbuf and copied t=
he
    result into the caller's.

    A process that had leaked 468k kqueue descriptors wired 757 MB of M_SBUF
    while dumping core, over roughly 9M reallocations, then copied the whole
    thing again.

    Reviewed by:    adrian, markj
    Differential Revision:  https://reviews.freebsd.org/D58536
    PR: 296835
    MFC after: 1 week

 sys/kern/kern_event.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

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