Date: Tue, 26 May 2026 17:29:55 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 295614] tun_destroy() holds ifnet_detach_sxlock while sleeping on tun_cv Message-ID: <bug-295614-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295614 Bug ID: 295614 Summary: tun_destroy() holds ifnet_detach_sxlock while sleeping on tun_cv Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: olivier@freebsd.org On FreeBSD 16-CURRENT (reproduced against main-n286096-490c53e9353f), `ifconfig tunN destroy` against a tun(4) device that has an open consumer wedges the kernel's ifnet-clone subsystem indefinitely. Reproducer (three commands, no special hardware or modules): ifconfig tun create # -> tun1 sleep 99999 < /dev/tun1 & ifconfig tun1 destroy The third command never returns. From that point on, every subsequent `ifconfig <anything> destroy`, `jail -R` that touches a cloned interface, and `jls` (via the allprison cascade described below) blocks in uninterruptible-style sleep. SIGKILL on the wedged ifconfig does not break it. Only a reboot recovers. -- You are receiving this mail because: You are the assignee for the bug.home | help
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