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* Mon Sep 15 2025 Miroslav Rezanina <mrezanin@redhat.com> - 10.1.0-2

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- kvm-e1000e-Prevent-crash-from-legacy-interrupt-firing-af.patch [RHEL-112882]
- Resolves: RHEL-112882
  ([DEV Task]: Assertion `core->delayed_causes == 0' failed with e1000e NIC)
This commit is contained in:
Miroslav Rezanina 2025-09-15 09:43:18 +02:00
parent a3dbefdd73
commit bc31f0ef22
2 changed files with 77 additions and 1 deletions
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69
kvm-e1000e-Prevent-crash-from-legacy-interrupt-firing-af.patch Normal file
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@ -0,0 +1,69 @@
From a2f30bafa346ef50932c359eaf71574ed3c1239d Mon Sep 17 00:00:00 2001
From: Laurent Vivier <lvivier@redhat.com>
Date: Thu, 7 Aug 2025 13:08:06 +0200
Subject: [PATCH] e1000e: Prevent crash from legacy interrupt firing after
MSI-X enable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Laurent Vivier <lvivier@redhat.com>
RH-MergeRequest: 403: e1000e: Prevent crash from legacy interrupt firing after MSI-X enable
RH-Jira: RHEL-112882
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Commit: [1/1] 8241a58b76307f27ad3d3b3b2106e00b153b7b53 (lvivier/qemu-kvm-centos)
JIRA: https://issues.redhat.com/browse/RHEL-112882
A race condition between guest driver actions and QEMU timers can lead
to an assertion failure when the guest switches the e1000e from legacy
interrupt mode to MSI-X. If a legacy interrupt delay timer (TIDV or
RDTR) is active, but the guest enables MSI-X before the timer fires,
the pending interrupt cause can trigger an assert in
e1000e_intmgr_collect_delayed_causes().
This patch removes the assertion and executes the code that clears the
pending legacy causes. This change is safe and introduces no unintended
behavioral side effects, as it only alters a state that previously led
to termination.
- when core->delayed_causes == 0 the function was already a no-op and
remains so.
- when core->delayed_causes != 0 the function would previously
crash due to the assertion failure. The patch now defines a safe
outcome by clearing the cause and returning. Since behavior after
the assertion never existed, this simply corrects the crash.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1863
Suggested-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Message-ID: <20250807110806.409065-1-lvivier@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit 8e4649cac9bcddc050d2df07908075e9e69bccc7)
---
hw/net/e1000e_core.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
index 2413858790..06657bb3ac 100644
--- a/hw/net/e1000e_core.c
+++ b/hw/net/e1000e_core.c
@@ -341,11 +341,6 @@ e1000e_intmgr_collect_delayed_causes(E1000ECore *core)
{
uint32_t res;
- if (msix_enabled(core->owner)) {
- assert(core->delayed_causes == 0);
- return 0;
- }
-
res = core->delayed_causes;
core->delayed_causes = 0;
--
2.47.3

9
qemu-kvm.spec
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@ -143,7 +143,7 @@ Obsoletes: %{name}-block-ssh <= %{epoch}:%{version} \
Summary: QEMU is a machine emulator and virtualizer
Name: qemu-kvm
Version: 10.1.0
Release: 1%{?rcrel}%{?dist}%{?cc_suffix}
Release: 2%{?rcrel}%{?dist}%{?cc_suffix}
# Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
# Epoch 15 used for RHEL 8
# Epoch 17 used for RHEL 9 (due to release versioning offset in RHEL 8.5)
@ -186,6 +186,8 @@ Patch0018: 0018-Add-support-statement-to-help-output.patch
Patch0019: 0019-Use-qemu-kvm-in-documentation-instead-of-qemu-system.patch
Patch0020: 0020-qcow2-Deprecation-warning-when-opening-v2-images-rw.patch
Patch0021: 0021-file-posix-Define-DM_MPATH_PROBE_PATHS.patch
# For RHEL-112882 - [DEV Task]: Assertion `core->delayed_causes == 0' failed with e1000e NIC
Patch22: kvm-e1000e-Prevent-crash-from-legacy-interrupt-firing-af.patch
%if %{have_clang}
BuildRequires: clang
@ -1265,6 +1267,11 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
%endif
%changelog
* Mon Sep 15 2025 Miroslav Rezanina <mrezanin@redhat.com> - 10.1.0-2
- kvm-e1000e-Prevent-crash-from-legacy-interrupt-firing-af.patch [RHEL-112882]
- Resolves: RHEL-112882
([DEV Task]: Assertion `core->delayed_causes == 0' failed with e1000e NIC)
* Fri Aug 29 2025 Miroslav Rezanina <mrezanin@redhat.com> - 10.1.0-1
- Rebase to QEMU 10.1.0 [RHEL-105035]
- Resolves: RHEL-105035