Re: [Qemu-devel] Crash when booting KDE Neon using qxl-vga

[Leonardo Soares Müller]

I can confirm this, KDE Neon using the command line similar to yours
crashes QEMU to me too. I will test with Mageia 7 later to see if it
behaves differently.

But this is a completely different crash. This crash is happening
earlier, what I reported first is a crash when the login screen should
load, this is happening earlier on boot.

The command line I used this time:

qemu-system-x86_64 -M pc,accel=kvm -smp 3 -m 4G -drive
if=virtio,file=neonbroken.qcow2 -vga qxl -bios /usr/share/ovmf/OVMF.fd

The backtrace:

(gdb) bt
#0  0x00007ffff0371e97 in __GI_raise (address@hidden) at
../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff0373801 in __GI_abort () at abort.c:79
#2  0x000055555589eac9 in kvm_mem_ioeventfd_add
(listener=0x555556a1fdc8, section=0x7fffc7ffba90, match_data=false,
data=0, e=0x5555578c7fc8) at
/home/usuario/Documentos/qemu/accel/kvm/kvm-all.c:866
#3  0x000055555588300a in address_space_add_del_ioeventfds
(as=0x5555567e5a00 <address_space_memory>, fds_new=0x7fffbc000d30,
fds_new_nb=1, fds_old=0x0, fds_old_nb=0) at
/home/usuario/Documentos/qemu/memory.c:793
#4  0x00005555558832f4 in address_space_update_ioeventfds
(as=0x5555567e5a00 <address_space_memory>) at
/home/usuario/Documentos/qemu/memory.c:843
#5  0x000055555588415b in memory_region_transaction_commit () at
/home/usuario/Documentos/qemu/memory.c:1094
#6  0x00005555558871c8 in memory_region_add_eventfd (mr=0x5555578b6420,
addr=0, size=0, match_data=false, data=0, e=0x5555578c7fc8) at
/home/usuario/Documentos/qemu/memory.c:2303
#7  0x0000555555c26cd0 in virtio_pci_ioeventfd_assign (d=0x5555578b5750,
notifier=0x5555578c7fc8, n=0, assign=true) at hw/virtio/virtio-pci.c:243
#8  0x0000555555c24dd5 in virtio_bus_set_host_notifier
(bus=0x5555578bd848, n=0, assign=true) at hw/virtio/virtio-bus.c:283
#9  0x00005555558ce648 in virtio_blk_data_plane_start
(vdev=0x5555578bd8c0) at
/home/usuario/Documentos/qemu/hw/block/dataplane/virtio-blk.c:200
#10 0x0000555555c24af2 in virtio_bus_start_ioeventfd
(bus=0x5555578bd848) at hw/virtio/virtio-bus.c:223
#11 0x0000555555c26e57 in virtio_pci_start_ioeventfd
(proxy=0x5555578b5750) at hw/virtio/virtio-pci.c:282
#12 0x0000555555c29285 in virtio_pci_common_write
(opaque=0x5555578b5750, addr=20, val=15, size=1) at
hw/virtio/virtio-pci.c:1233
#13 0x0000555555881ebd in memory_region_write_accessor
(mr=0x5555578b6120, addr=20, value=0x7fffc7ffbf38, size=1, shift=0,
mask=255, attrs=...) at /home/usuario/Documentos/qemu/memory.c:502
#14 0x00005555558820cd in access_with_adjusted_size (addr=20,
value=0x7fffc7ffbf38, size=1, access_size_min=1, access_size_max=4,
access_fn=0x555555881dd4 <memory_region_write_accessor>,
mr=0x5555578b6120, attrs=...) at /home/usuario/Documentos/qemu/memory.c:568
#15 0x0000555555885100 in memory_region_dispatch_write
(mr=0x5555578b6120, addr=20, data=15, size=1, attrs=...) at
/home/usuario/Documentos/qemu/memory.c:1499
#16 0x000055555581bca9 in flatview_write_continue (fv=0x7fffcc50f4f0,
addr=34359738388, attrs=..., buf=0x7ffff7fee028 "\017", len=1, addr1=20,
l=1, mr=0x5555578b6120) at /home/usuario/Documentos/qemu/exec.c:3234
#17 0x000055555581bdf3 in flatview_write (fv=0x7fffcc50f4f0,
addr=34359738388, attrs=..., buf=0x7ffff7fee028 "\017", len=1) at
/home/usuario/Documentos/qemu/exec.c:3273
#18 0x000055555581c0f9 in address_space_write (as=0x5555567e5a00
<address_space_memory>, addr=34359738388, attrs=..., buf=0x7ffff7fee028
"\017", len=1) at /home/usuario/Documentos/qemu/exec.c:3363
#19 0x000055555581c14a in address_space_rw (as=0x5555567e5a00
<address_space_memory>, addr=34359738388, attrs=..., buf=0x7ffff7fee028
"\017", len=1, is_write=true) at /home/usuario/Documentos/qemu/exec.c:3374
#20 0x00005555558a146f in kvm_cpu_exec (cpu=0x555556afe140) at
/home/usuario/Documentos/qemu/accel/kvm/kvm-all.c:2031
#21 0x0000555555865a3e in qemu_kvm_cpu_thread_fn (arg=0x555556afe140) at
/home/usuario/Documentos/qemu/cpus.c:1281
#22 0x0000555555e1ba02 in qemu_thread_start (args=0x555556b20440) at
util/qemu-thread-posix.c:502
#23 0x00007ffff072b6db in start_thread (arg=0x7fffc7fff700) at
pthread_create.c:463
#24 0x00007ffff045488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95


Às 11:36 de 01/02/2019, Dr. David Alan Gilbert escreveu:
> 
> Hmm, I'm also getting a crash, but I think it's very different from
> yours:
> 
> ./x86_64-softmmu/qemu-system-x86_64 -M pc,accel=kvm -smp 3 -m 8G -cdrom 
> /home/vmimages/neon-useredition-current.iso -drive 
> if=virtio,file=/home/vmimages/kde-neon.qcow2 -vga qxl
> 
> kvm_mem_ioeventfd_add: error adding ioeventfd: No space left on device
> Aborted (core dumped)
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>