netdev - [PATCH net-next v11 08/13] selftests/vsock: add vm_dmesg_{warn,oops}

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Message-Id: <20251120-vsock-vmtest-v11-8-55cbc80249a7@meta.com>
Date: Thu, 20 Nov 2025 21:44:40 -0800
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Stefan Hajnoczi <stefanha@...hat.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 "K. Y. Srinivasan" <kys@...rosoft.com>, 
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
 Dexuan Cui <decui@...rosoft.com>, Bryan Tan <bryan-bt.tan@...adcom.com>, 
 Vishnu Dasa <vishnu.dasa@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, 
 netdev@...r.kernel.org, kvm@...r.kernel.org, linux-hyperv@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, berrange@...hat.com, 
 Sargun Dhillon <sargun@...gun.me>, Bobby Eshleman <bobbyeshleman@...il.com>, 
 Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH net-next v11 08/13] selftests/vsock: add
 vm_dmesg_{warn,oops}_count() helpers

From: Bobby Eshleman <bobbyeshleman@...a.com>

These functions are reused by the VM tests to collect and compare dmesg
warnings and oops counts. The future VM-specific tests use them heavily.
This patches relies on vm_ssh() already supporting namespaces.

Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
Changes in v11:
- break these out into an earlier patch so that they can be used
  directly in new patches (instead of causing churn by adding this
  later)
---
 tools/testing/selftests/vsock/vmtest.sh | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index 4da91828a6a0..1623e4da15e2 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -389,6 +389,17 @@ host_wait_for_listener() {
 	fi
 }

+vm_dmesg_oops_count() {
+	local ns=$1
+
+	vm_ssh "${ns}" -- dmesg 2>/dev/null | grep -c -i 'Oops'
+}
+
+vm_dmesg_warn_count() {
+	local ns=$1
+
+	vm_ssh "${ns}" -- dmesg --level=warn 2>/dev/null | grep -c -i 'vsock'
+}

 vm_vsock_test() {
 	local ns=$1
@@ -596,8 +607,8 @@ run_shared_vm_test() {

 	host_oops_cnt_before=$(dmesg | grep -c -i 'Oops')
 	host_warn_cnt_before=$(dmesg --level=warn | grep -c -i 'vsock')
-	vm_oops_cnt_before=$(vm_ssh -- dmesg | grep -c -i 'Oops')
-	vm_warn_cnt_before=$(vm_ssh -- dmesg --level=warn | grep -c -i 'vsock')
+	vm_oops_cnt_before=$(vm_dmesg_oops_count "init_ns")
+	vm_warn_cnt_before=$(vm_dmesg_warn_count "init_ns")

 	name=$(echo "${1}" | awk '{ print $1 }')
 	eval test_"${name}"
@@ -615,13 +626,13 @@ run_shared_vm_test() {
 		rc=$KSFT_FAIL
 	fi

-	vm_oops_cnt_after=$(vm_ssh -- dmesg | grep -i 'Oops' | wc -l)
+	vm_oops_cnt_after=$(vm_dmesg_oops_count "init_ns")
 	if [[ ${vm_oops_cnt_after} -gt ${vm_oops_cnt_before} ]]; then
 		echo "FAIL: kernel oops detected on vm" | log_host
 		rc=$KSFT_FAIL
 	fi

-	vm_warn_cnt_after=$(vm_ssh -- dmesg --level=warn | grep -c -i 'vsock')
+	vm_warn_cnt_after=$(vm_dmesg_warn_count "init_ns")
 	if [[ ${vm_warn_cnt_after} -gt ${vm_warn_cnt_before} ]]; then
 		echo "FAIL: kernel warning detected on vm" | log_host
 		rc=$KSFT_FAIL

-- 
2.47.3