Date: Fri, 07 Nov 2025 23:12:49 +0000 From: bugzilla-noreply@freebsd.org To: testing@FreeBSD.org Subject: [Bug 289930] Booting FreeBSD 16-CURRENT on riscv64 with QEMU hangs indefinitely Message-ID: <bug-289930-32464-9VWuzCNscR@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-289930-32464@https.bugs.freebsd.org/bugzilla/> References: <bug-289930-32464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289930 --- Comment #4 from commit-hook@FreeBSD.org --- A commit in branch releng/15.0 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=69c726c150772c36854d38e51b6fd921a04caea5 commit 69c726c150772c36854d38e51b6fd921a04caea5 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2025-11-04 14:27:33 +0000 Commit: Colin Percival <cperciva@FreeBSD.org> CommitDate: 2025-11-07 23:12:02 +0000 virtio: Fix polling in virtqueue_dequeue() The access of vq->vq_ring.used->idx needs to be volatile-qualified, otherwise the compiler may optimize virtqueue_poll() into an infinite loop if there is no data available upon the first poll. Prior to commit ad17789a8569 this wasn't a problem since an external function call after each poll inhibited the optimization. Approved by: re (cperciva) PR: 289930 MFC after: 3 days Sponsored by: Klara, Inc. Fixes: ad17789a8569 ("virtio: Remove the unused poll method") (cherry picked from commit f999ffdce3813eb946f10999ccffb8275c324469) (cherry picked from commit 72c76047541ab6cc0e989a74e8de4d6e6a1a94b6) sys/dev/virtio/virtqueue.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- You are receiving this mail because: You are on the CC list for the bug.
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