Date: Thu, 2 Apr 2026 05:50:40 -0700 From: David Wolfskill <david@catwhisker.org> To: current@freebsd.org Subject: Panic: "knote ... was already on knlist..." after main-n284826-d9d7b5948649 Message-ID: <ac5mIAT2mREod9OK@albert.catwhisker.org>
index | next in thread | raw e-mail
[-- Attachment #1 --] Build machine (kernel GENERIC) did not experience this. So far, 3 out of 3 laptops have (the 4th one has yet to finish the build). I snapped a photo, which is up at https://www.catwhisker.org/~david/FreeBSD/head/n284826/screen.jpg The panic occurs during the late(r) part of the transition to multi-user mode. I am happy to poke at one of the machines, given suitable clues: I tend to break stuff. The machines had previously built and run main-n284804-f3b59bf28504. All machines are amd64, and I use PORTS_MODULES in /etc/src.conf to ensure that ports-resident kernel modules get rebuilt whenever the kernel does./~david/FreeBSD/head/n284826/screen.jpg The panic occurs during the late(r) part of the transition to multi-user mode. I am happy to poke at one of the machines, given suitable clues: I tend to break stuff. A quick scan down the backtrace shows: db_trace_self_wrapper() vpanic() panic() knlist_remove() kqueue_fork_copy_list() kqueue_fork() fdcopy() do_fork() fork() sys_fork() amd64_syscall() fast_syscall_common() --- syscall KDB: enter: panic [ thread pid 1891 tld 100578 ] Stopped at xffffffffff88c177c3 = kdb_enter+0x33: movq $0,0x15f7842(%rip) db> The machines had previously built and run main-n284804-f3b59bf28504. All machines are amd64, and I use PORTS_MODULES in /etc/src.conf to ensure that ports-resident kernel modules get rebuilt whenever the kernel does. Oh -- the 4th laptop also panicked (apparently similarly). The older 3 laptops use custom kernels, but the newest one (which uses ZFS & boot environments; the oolder ones do not) uses a GENERIC kernel (as the build machine does). Peace, david -- David H. Wolfskill david@catwhisker.org See https://www.catwhisker.org/~david/publickey.gpg for my public key. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iNUEARYKAH0WIQRCec5RsK7Enudh3yGB9MJ9AwUELQUCac5mIF8UgAAAAAAuAChp c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0NDI3 OUNFNTFCMEFFQzQ5RUU3NjFERjIxODFGNEMyN0QwMzA1MDQyRAAKCRCB9MJ9AwUE LSE+AP4nXODDVhiGzAwL/jd9fE8jnp2THcVqzP5g8Iv/O4haXgEAqoGrAFw0nKia Ue3g2m6yqWu/kaszQU5wEZZ+q/D05Ao= =R5P2 -----END PGP SIGNATURE-----home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?ac5mIAT2mREod9OK>