add new classifier result

1 files changed, 99 insertions, 0 deletions

diff --git a/results/classifier/002/other/16056596 b/results/classifier/002/other/16056596
new file mode 100644
index 00000000..4891231a
--- /dev/null
+++ b/results/classifier/002/other/16056596
@@ -0,0 +1,99 @@
+other: 0.980
+semantic: 0.979
+instruction: 0.975
+boot: 0.971
+mistranslation: 0.961
+
+[BUG][powerpc] KVM Guest Boot Failure and Hang at "Booting Linux via __start()"
+
+Bug Description:
+Encountering a boot failure when launching a KVM guest with
+'qemu-system-ppc64'. The guest hangs at boot, and the QEMU monitor
+crashes.
+Reproduction Steps:
+# qemu-system-ppc64 --version
+QEMU emulator version 9.2.50 (v9.2.0-2799-g0462a32b4f)
+Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers
+# /usr/bin/qemu-system-ppc64 -name avocado-vt-vm1 -machine
+pseries,accel=kvm \
+-m 32768 -smp 32,sockets=1,cores=32,threads=1 -nographic \
+  -device virtio-scsi-pci,id=scsi \
+-drive
+file=/home/kvmci/tests/data/avocado-vt/images/rhel8.0devel-ppc64le.qcow2,if=none,id=drive0,format=qcow2
+\
+-device scsi-hd,drive=drive0,bus=scsi.0 \
+  -netdev bridge,id=net0,br=virbr0 \
+  -device virtio-net-pci,netdev=net0 \
+  -serial pty \
+  -device virtio-balloon-pci \
+  -cpu host
+QEMU 9.2.50 monitor - type 'help' for more information
+char device redirected to /dev/pts/2 (label serial0)
+(qemu)
+(qemu) qemu-system-ppc64: warning: kernel_irqchip allowed but
+unavailable: IRQ_XIVE capability must be present for KVM
+Falling back to kernel-irqchip=off
+** Qemu Hang
+
+(In another ssh session)
+# screen /dev/pts/2
+Preparing to boot Linux version 6.10.4-200.fc40.ppc64le
+(mockbuild@c23cc4e677614c34bb22d54eeea4dc1f) (gcc (GCC) 14.2.1 20240801
+(Red Hat 14.2.1-1), GNU ld version 2.41-37.fc40) #1 SMP Sun Aug 11
+15:20:17 UTC 2024
+Detected machine type: 0000000000000101
+command line:
+BOOT_IMAGE=(ieee1275/disk,msdos2)/vmlinuz-6.10.4-200.fc40.ppc64le
+root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root crashkernel=1024M
+Max number of cores passed to firmware: 2048 (NR_CPUS = 2048)
+Calling ibm,client-architecture-support... done
+memory layout at init:
+  memory_limit : 0000000000000000 (16 MB aligned)
+  alloc_bottom : 0000000008200000
+  alloc_top    : 0000000030000000
+  alloc_top_hi : 0000000800000000
+  rmo_top      : 0000000030000000
+  ram_top      : 0000000800000000
+instantiating rtas at 0x000000002fff0000... done
+prom_hold_cpus: skipped
+copying OF device tree...
+Building dt strings...
+Building dt structure...
+Device tree strings 0x0000000008210000 -> 0x0000000008210bd0
+Device tree struct  0x0000000008220000 -> 0x0000000008230000
+Quiescing Open Firmware ...
+Booting Linux via __start() @ 0x0000000000440000 ...
+** Guest Console Hang
+
+
+Git Bisect:
+Performing git bisect points to the following patch:
+# git bisect bad
+e8291ec16da80566c121c68d9112be458954d90b is the first bad commit
+commit e8291ec16da80566c121c68d9112be458954d90b (HEAD)
+Author: Nicholas Piggin <npiggin@gmail.com>
+Date:   Thu Dec 19 13:40:31 2024 +1000
+
+    target/ppc: fix timebase register reset state
+(H)DEC and PURR get reset before icount does, which causes them to
+be
+skewed and not match the init state. This can cause replay to not
+match the recorded trace exactly. For DEC and HDEC this is usually
+not
+noticable since they tend to get programmed before affecting the
+    target machine. PURR has been observed to cause replay bugs when
+    running Linux.
+
+    Fix this by resetting using a time of 0.
+
+    Message-ID: <20241219034035.1826173-2-npiggin@gmail.com>
+    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
+
+ hw/ppc/ppc.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+
+Reverting the patch helps boot the guest.
+Thanks,
+Misbah Anjum N
+