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Diffstat (limited to 'results/classifier/gemma3:12b/kernel/1794950')
| -rw-r--r-- | results/classifier/gemma3:12b/kernel/1794950 | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/results/classifier/gemma3:12b/kernel/1794950 b/results/classifier/gemma3:12b/kernel/1794950 new file mode 100644 index 00000000..86376be3 --- /dev/null +++ b/results/classifier/gemma3:12b/kernel/1794950 @@ -0,0 +1,84 @@ + +qemu hangs when guest is using linux kernel 4.16+ + +I have been using qemu on daily basis 5+ years in order to do btrfs development and testing and it always worked perfectly, until I upgraded the linux kernel of the guests to 4.16. With 4.16+ kernels, when running all the fstests (previously called xfstests), the qemu process hangs (console unresponsive, can't ping or ssh the guest anymore, etc) and stays in a state Sl+ according to 'ps'. + +This happens on two different physical machines, one running openSUSE tumbleweed (which I don't access at the moment to check kernel version) and another running xubuntu (tried kernels 4.15.0-32-generic and vanilla 4.18.0). Using any kernel from 4.16 to 4.19-rc5 in the guests (they use different debian versions) makes qemu hang running the fstests suite (after about 30 to 40 minutes, either at test generic/299 or test generic/451). + +I tried different qemu versions, 2.11.2, 2.12.1 and 3.0.0, and it happens with all of them (all built from the sources available at https://www.qemu.org/download/#source). + +I built 3.0.0 with debug enabled, using the following parameters for 'configure': + +--prefix=/home/fdmanana/qemu-3.0.0 --enable-tools --enable-linux-aio --enable-kvm --enable-vnc --enable-vnc-png --enable-debug --extra-cflags="-O0 -g3 -fno-omit-frame-pointer" + +And captured a coredump of the qemu process, available at: + +https://www.dropbox.com/s/d1tlsimahykwhla/core_dump_debug.tar.xz?dl=0 + +the stack traces of all threads, for a quick look: + +https://friendpaste.com/zqkz2pD0WgSdeSKITHPDf + +qemu is being invoked with the following script: + +#!/bin/bash -x + +sudo modprobe tun +sudo modprobe kvm +sudo modprobe kvm-intel + +sudo tunctl -t tap5 -u fdmanana +sudo ifconfig tap5 up +sudo brctl addif br0 tap5 + +sudo umount /mnt/tmp5 +sudo mkdir -p /mnt/tmp5 +sudo mount -t tmpfs -o size=14G tmpfs /mnt/tmp5 +for ((i = 2; i <= 7; i++)); do + sudo qemu-img create -f qcow2 /mnt/tmp5/disk$i 13G +done +sudo chown fdmanana /mnt/tmp5/disk* + +qemu-system-x86_64 -m 4G \ + -device virtio-scsi-pci \ + -boot c \ +\ + -drive if=none,file=debian5.qcow2,cache=none,aio=native,cache.direct=on,format=qcow2,id=drive0,discard=on \ + -device scsi-hd,drive=drive0,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk2,cache=writeback,format=qcow2,id=drive1,discard=on \ + -device scsi-hd,drive=drive1,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk3,cache=writeback,format=qcow2,id=drive2,discard=on \ + -device scsi-hd,drive=drive2,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk4,cache=writeback,format=qcow2,id=drive3,discard=on \ + -device scsi-hd,drive=drive3,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk5,cache=writeback,format=qcow2,id=drive4,discard=on \ + -device scsi-hd,drive=drive4,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk6,cache=writeback,format=qcow2,id=drive5,discard=on \ + -device scsi-hd,drive=drive5,bus=scsi.0 \ +\ + -drive if=none,file=/mnt/tmp5/disk7,cache=writeback,format=qcow2,id=drive6,discard=on \ + -device scsi-hd,drive=drive6,bus=scsi.0 \ +\ + -drive if=none,file=disk8,cache=writeback,aio=native,cache.direct=on,format=qcow2,id=drive7,discard=on \ + -device scsi-hd,drive=drive7,bus=scsi.0 \ +\ + -drive if=none,file=disk9,cache=writeback,aio=native,cache.direct=on,format=qcow2,id=drive8,discard=on \ + -device scsi-hd,drive=drive8,bus=scsi.0 \ +\ + -drive if=none,file=disk10,cache=writeback,aio=native,cache.direct=on,format=qcow2,id=drive9,discard=on \ + -device scsi-hd,drive=drive9,bus=scsi.0 \ +\ + -net nic,macaddr=52:54:00:12:34:fa -net tap,ifname=tap5,script=no,downscript=no \ + -rtc base=localtime -enable-kvm -machine accel=kvm -smp 4 -cpu host \ + -k pt -serial tcp:127.0.0.1:9997 -display vnc=:5 + + + +Is there anything else I can provided to help debug this? + +Thanks. \ No newline at end of file |