ci: fail workflows on kernel issues found in dmesg

Recently i wasted several hours searching bug in workflows/userspace.
Turned out in dmesg we had highly visible WARNING that we dont watch.

After each test run, dump dmesg and grep for canonical kernel-issue
markers (WARNING, BUG, Oops, kernel panic, GPF, KASAN, kernel UBSAN,
soft/hard lockup, hung tasks, bad page state, invalid opcode). Fail
the job if any are present, with a GitHub Actions error annotation.

Until now, kernel WARNs from out-of-tree drivers (e.g. vlan_mon
tripping the new ETH_P_ALL ptype_head WARN_ON in 6.6+) were silently
swallowed by the existing 'Display processes and dmesg after tests'
steps -- visible only if a human inspected the log. The check runs
with if: always() so it triggers both on test failure and on test
completion.

Applied to all four workflows that load kernel modules:
run-tests-asan-ubsan.yml, run-tests.yml (Test-in-Qemu, Test-in-Alpine,
Test-in-GH, Test-in-GH-Coverage), run-tests-32bit.yml, and
run-tests-bigendian.yml.

P.S. Some whitespace churn included.

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

1 files changed, 40 insertions, 4 deletions

diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index af7b5727..6db3574c 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -170,14 +170,23 @@ jobs:
       - name: Run tests (all)
         timeout-minutes: 5
         run: >
-          ssh -i ssh-key -p2222 user@localhost "cd accel-ppp/tests && 
+          ssh -i ssh-key -p2222 user@localhost "cd accel-ppp/tests &&
           sudo python3 -m pytest -Wall --order-dependencies -v"
       - name: Display processes and dmesg after tests
         if: ${{ always() }}
         run: >
-          ssh -i ssh-key -p2222 user@localhost "ps aux | grep accel- && 
+          ssh -i ssh-key -p2222 user@localhost "ps aux | grep accel- &&
           sudo dmesg"
 
+      - name: Check dmesg for kernel issues
+        if: ${{ always() }}
+        run: |
+          ssh -i ssh-key -p2222 user@localhost "sudo dmesg" > /tmp/dmesg.log
+          if grep -E 'WARNING:|BUG:|Oops:|kernel panic|general protection fault|KASAN|UBSAN:|soft lockup|hard LOCKUP|INFO: task .+ blocked|Bad page state|invalid opcode' /tmp/dmesg.log; then
+            echo "::error::Kernel issues detected in dmesg"
+            exit 1
+          fi
+
   Test-in-Alpine:
     #if: ${{ false }} # disable for now
     runs-on: ubuntu-24.04
@@ -299,14 +308,23 @@ jobs:
       - name: Run tests (all)
         timeout-minutes: 5
         run: >
-          ssh -i ssh-key -p2222 alpine@localhost "cd accel-ppp/tests && 
+          ssh -i ssh-key -p2222 alpine@localhost "cd accel-ppp/tests &&
           doas python3 -m pytest -Wall --order-dependencies -v -m \"not chap_secrets\""
       - name: Display processes and dmesg after tests
         if: ${{ always() }}
         run: >
-          ssh -i ssh-key -p2222 alpine@localhost "ps aux | grep accel- && 
+          ssh -i ssh-key -p2222 alpine@localhost "ps aux | grep accel- &&
           doas dmesg"
 
+      - name: Check dmesg for kernel issues
+        if: ${{ always() }}
+        run: |
+          ssh -i ssh-key -p2222 alpine@localhost "doas dmesg" > /tmp/dmesg.log
+          if grep -E 'WARNING:|BUG:|Oops:|kernel panic|general protection fault|KASAN|UBSAN:|soft lockup|hard LOCKUP|INFO: task .+ blocked|Bad page state|invalid opcode' /tmp/dmesg.log; then
+            echo "::error::Kernel issues detected in dmesg"
+            exit 1
+          fi
+
 
   Test-in-GH:
     #if: ${{ false }} # disable for now
@@ -363,6 +381,15 @@ jobs:
         working-directory: ./tests
         run: sudo python3 -m pytest -Wall --order-dependencies -v
 
+      - name: Check dmesg for kernel issues
+        if: ${{ always() }}
+        run: |
+          sudo dmesg | tee /tmp/dmesg.log
+          if grep -E 'WARNING:|BUG:|Oops:|kernel panic|general protection fault|KASAN|UBSAN:|soft lockup|hard LOCKUP|INFO: task .+ blocked|Bad page state|invalid opcode' /tmp/dmesg.log; then
+            echo "::error::Kernel issues detected in dmesg"
+            exit 1
+          fi
+
   Test-in-GH-Coverage:
     #if: ${{ false }} # disable for now
     strategy:
@@ -419,6 +446,15 @@ jobs:
         working-directory: ./tests
         run: sudo python3 -m pytest -Wall --order-dependencies -v || exit 0
 
+      - name: Check dmesg for kernel issues
+        if: ${{ always() }}
+        run: |
+          sudo dmesg | tee /tmp/dmesg.log
+          if grep -E 'WARNING:|BUG:|Oops:|kernel panic|general protection fault|KASAN|UBSAN:|soft lockup|hard LOCKUP|INFO: task .+ blocked|Bad page state|invalid opcode' /tmp/dmesg.log; then
+            echo "::error::Kernel issues detected in dmesg"
+            exit 1
+          fi
+
       - name: Generate coverage reports (default(txt), csv, html)
         run: |
           mkdir -p tests/report