diff --git a/.github/workflows/scripts/qemu-3-deps.sh b/.github/workflows/scripts/qemu-3-deps.sh
index 02bff954fd5b..35fa5016e9f6 100755
--- a/.github/workflows/scripts/qemu-3-deps.sh
+++ b/.github/workflows/scripts/qemu-3-deps.sh
@@ -1,222 +1,222 @@
 #!/usr/bin/env bash
 
 ######################################################################
 # 3) install dependencies for compiling and loading
 ######################################################################
 
 set -eu
 
 function archlinux() {
   echo "##[group]Running pacman -Syu"
   sudo btrfs filesystem resize max /
   sudo pacman -Syu --noconfirm
   echo "##[endgroup]"
 
   echo "##[group]Install Development Tools"
   sudo pacman -Sy --noconfirm base-devel bc cpio dhclient dkms fakeroot \
     fio gdb inetutils jq less linux linux-headers lsscsi nfs-utils parted \
     pax perf python-packaging python-setuptools qemu-guest-agent ksh samba \
     sysstat rng-tools rsync wget
   echo "##[endgroup]"
 }
 
 function debian() {
   export DEBIAN_FRONTEND="noninteractive"
 
   echo "##[group]Running apt-get update+upgrade"
   sudo apt-get update -y
   sudo apt-get upgrade -y
   echo "##[endgroup]"
 
   echo "##[group]Install Development Tools"
   sudo apt-get install -y \
     acl alien attr autoconf bc cpio curl dbench dh-python dkms fakeroot \
     fio gdb gdebi git ksh lcov isc-dhcp-client jq libacl1-dev libaio-dev \
-    libattr1-dev libblkid-dev libcurl4-openssl-dev libdevmapper-dev \
-    libelf-dev libffi-dev libmount-dev libpam0g-dev libselinux-dev \
-    libssl-dev libtool libtool-bin libudev-dev linux-headers-$(uname -r) \
+    libattr1-dev libblkid-dev libcurl4-openssl-dev libdevmapper-dev libelf-dev \
+    libffi-dev libmount-dev libpam0g-dev libselinux-dev libssl-dev libtool \
+    libtool-bin libudev-dev libunwind-dev linux-headers-$(uname -r) \
     lsscsi nfs-kernel-server pamtester parted python3 python3-all-dev \
     python3-cffi python3-dev python3-distlib python3-packaging \
     python3-setuptools python3-sphinx qemu-guest-agent rng-tools rpm2cpio \
     rsync samba sysstat uuid-dev watchdog wget xfslibs-dev zlib1g-dev
   echo "##[endgroup]"
 }
 
 function freebsd() {
   export ASSUME_ALWAYS_YES="YES"
 
   echo "##[group]Install Development Tools"
   sudo pkg install -y autoconf automake autotools base64 checkbashisms fio \
     gdb gettext gettext-runtime git gmake gsed jq ksh93 lcov libtool lscpu \
     pkgconf python python3 pamtester pamtester qemu-guest-agent rsync \
     sysutils/coreutils
   sudo pkg install -xy \
     '^samba4[[:digit:]]+$' \
     '^py3[[:digit:]]+-cffi$' \
     '^py3[[:digit:]]+-sysctl$' \
     '^py3[[:digit:]]+-packaging$'
   echo "##[endgroup]"
 }
 
 # common packages for: almalinux, centos, redhat
 function rhel() {
   echo "##[group]Running dnf update"
   echo "max_parallel_downloads=10" | sudo -E tee -a /etc/dnf/dnf.conf
   sudo dnf clean all
   sudo dnf update -y --setopt=fastestmirror=1 --refresh
   echo "##[endgroup]"
 
   echo "##[group]Install Development Tools"
   sudo dnf group install -y "Development Tools"
   sudo dnf install -y \
     acl attr bc bzip2 curl dbench dkms elfutils-libelf-devel fio gdb git \
     jq kernel-rpm-macros ksh libacl-devel libaio-devel libargon2-devel \
     libattr-devel libblkid-devel libcurl-devel libffi-devel ncompress \
     libselinux-devel libtirpc-devel libtool libudev-devel libuuid-devel \
     lsscsi mdadm nfs-utils openssl-devel pam-devel pamtester parted perf \
     python3 python3-cffi python3-devel python3-packaging kernel-devel \
     python3-setuptools qemu-guest-agent rng-tools rpcgen rpm-build rsync \
     samba sysstat systemd watchdog wget xfsprogs-devel zlib-devel
   echo "##[endgroup]"
 }
 
 function tumbleweed() {
   echo "##[group]Running zypper is TODO!"
   sleep 23456
   echo "##[endgroup]"
 }
 
 # Install dependencies
 case "$1" in
   almalinux8)
     echo "##[group]Enable epel and powertools repositories"
     sudo dnf config-manager -y --set-enabled powertools
     sudo dnf install -y epel-release
     echo "##[endgroup]"
     rhel
     echo "##[group]Install kernel-abi-whitelists"
     sudo dnf install -y kernel-abi-whitelists
     echo "##[endgroup]"
     ;;
   almalinux9|centos-stream9)
     echo "##[group]Enable epel and crb repositories"
     sudo dnf config-manager -y --set-enabled crb
     sudo dnf install -y epel-release
     echo "##[endgroup]"
     rhel
     echo "##[group]Install kernel-abi-stablelists"
     sudo dnf install -y kernel-abi-stablelists
     echo "##[endgroup]"
     ;;
   archlinux)
     archlinux
     ;;
   debian*)
     debian
     echo "##[group]Install Debian specific"
     sudo apt-get install -yq linux-perf dh-sequence-dkms
     echo "##[endgroup]"
     ;;
   fedora*)
     rhel
     ;;
   freebsd*)
     freebsd
     ;;
   tumbleweed)
     tumbleweed
     ;;
   ubuntu*)
     debian
     echo "##[group]Install Ubuntu specific"
     sudo apt-get install -yq linux-tools-common libtirpc-dev \
       linux-modules-extra-$(uname -r)
     if [ "$1" != "ubuntu20" ]; then
       sudo apt-get install -yq dh-sequence-dkms
     fi
     echo "##[endgroup]"
     echo "##[group]Delete Ubuntu OpenZFS modules"
     for i in $(find /lib/modules -name zfs -type d); do sudo rm -rvf $i; done
     echo "##[endgroup]"
     ;;
 esac
 
 # This script is used for checkstyle + zloop deps also.
 # Install only the needed packages and exit - when used this way.
 test -z "${ONLY_DEPS:-}" || exit 0
 
 # Start services
 echo "##[group]Enable services"
 case "$1" in
   freebsd*)
     # add virtio things
     echo 'virtio_load="YES"' | sudo -E tee -a /boot/loader.conf
     for i in balloon blk console random scsi; do
       echo "virtio_${i}_load=\"YES\"" | sudo -E tee -a /boot/loader.conf
     done
     echo "fdescfs /dev/fd fdescfs rw 0 0" | sudo -E tee -a /etc/fstab
     sudo -E mount /dev/fd
     sudo -E touch /etc/zfs/exports
     sudo -E sysrc mountd_flags="/etc/zfs/exports"
     echo '[global]' | sudo -E tee /usr/local/etc/smb4.conf >/dev/null
     sudo -E service nfsd enable
     sudo -E service qemu-guest-agent enable
     sudo -E service samba_server enable
     ;;
   debian*|ubuntu*)
     sudo -E systemctl enable nfs-kernel-server
     sudo -E systemctl enable qemu-guest-agent
     sudo -E systemctl enable smbd
     ;;
   *)
     # All other linux distros
     sudo -E systemctl enable nfs-server
     sudo -E systemctl enable qemu-guest-agent
     sudo -E systemctl enable smb
     ;;
 esac
 echo "##[endgroup]"
 
 # Setup Kernel cmdline
 CMDLINE="console=tty0 console=ttyS0,115200n8"
 CMDLINE="$CMDLINE selinux=0"
 CMDLINE="$CMDLINE random.trust_cpu=on"
 CMDLINE="$CMDLINE no_timer_check"
 case "$1" in
   almalinux*|centos*|fedora*)
     GRUB_CFG="/boot/grub2/grub.cfg"
     GRUB_MKCONFIG="grub2-mkconfig"
     CMDLINE="$CMDLINE biosdevname=0 net.ifnames=0"
     echo 'GRUB_SERIAL_COMMAND="serial --speed=115200"' \
       | sudo tee -a /etc/default/grub >/dev/null
     ;;
   ubuntu24)
     GRUB_CFG="/boot/grub/grub.cfg"
     GRUB_MKCONFIG="grub-mkconfig"
     echo 'GRUB_DISABLE_OS_PROBER="false"' \
       | sudo tee -a /etc/default/grub >/dev/null
     ;;
   *)
     GRUB_CFG="/boot/grub/grub.cfg"
     GRUB_MKCONFIG="grub-mkconfig"
     ;;
 esac
 
 case "$1" in
   archlinux|freebsd*)
     true
     ;;
   *)
     echo "##[group]Edit kernel cmdline"
     sudo sed -i -e '/^GRUB_CMDLINE_LINUX/d' /etc/default/grub || true
     echo "GRUB_CMDLINE_LINUX=\"$CMDLINE\"" \
       | sudo tee -a /etc/default/grub >/dev/null
     sudo $GRUB_MKCONFIG -o $GRUB_CFG
     echo "##[endgroup]"
     ;;
 esac
 
 # reset cloud-init configuration and poweroff
 sudo cloud-init clean --logs
 sleep 2 && sudo poweroff &
 exit 0
diff --git a/.github/workflows/zloop.yml b/.github/workflows/zloop.yml
index 35d8cc977af0..90d93c48e4bd 100644
--- a/.github/workflows/zloop.yml
+++ b/.github/workflows/zloop.yml
@@ -1,65 +1,77 @@
 name: zloop
 
 on:
   push:
   pull_request:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
   zloop:
     runs-on: ubuntu-24.04
     env:
       TEST_DIR: /var/tmp/zloop
     steps:
     - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Install dependencies
       run: |
         sudo apt-get purge -y snapd google-chrome-stable firefox
         ONLY_DEPS=1 .github/workflows/scripts/qemu-3-deps.sh ubuntu24
     - name: Autogen.sh
       run: |
         sed -i '/DEBUG_CFLAGS="-Werror"/s/^/#/' config/zfs-build.m4
         ./autogen.sh
     - name: Configure
       run: |
         ./configure --prefix=/usr --enable-debug --enable-debuginfo \
            --enable-asan --enable-ubsan \
            --enable-debug-kmem --enable-debug-kmem-tracking
     - name: Make
       run: |
         make -j$(nproc)
     - name: Install
       run: |
         sudo make install
         sudo depmod
         sudo modprobe zfs
     - name: Tests
       run: |
         sudo mkdir -p $TEST_DIR
         # run for 10 minutes or at most 6 iterations for a maximum runner
         # time of 60 minutes.
-        sudo /usr/share/zfs/zloop.sh -t 600 -I 6 -l -m1 -- -T 120 -P 60
+        sudo /usr/share/zfs/zloop.sh -t 600 -I 6 -l -m 1 -- -T 120 -P 60
     - name: Prepare artifacts
       if: failure()
       run: |
         sudo chmod +r -R $TEST_DIR/
+    - name: Ztest log
+      if: failure()
+      run: |
+        grep -B10 -A1000 'ASSERT' $TEST_DIR/*/ztest.out || tail -n 1000 $TEST_DIR/*/ztest.out
+    - name: Gdb log
+      if: failure()
+      run: |
+        sed -n '/Backtraces (full)/q;p' $TEST_DIR/*/ztest.gdb
+    - name: Zdb log
+      if: failure()
+      run: |
+        cat $TEST_DIR/*/ztest.zdb
     - uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: Logs
         path: |
           /var/tmp/zloop/*/
           !/var/tmp/zloop/*/vdev/
         if-no-files-found: ignore
     - uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: Pool files
         path: |
           /var/tmp/zloop/*/vdev/
         if-no-files-found: ignore