Re: RBD volume not made available to Xen virtual guest on openSUSE 15.2 (with libvirt 6.0.0)

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Further to this, the error may be coming from QEMU, but the guests work fine when started using KVM (+ libvirt + QEMU) instead of Xen (+ libvirt + QEMU). So is it possible the problem is in libvirt, or rather, in the interaction between libvirt, Xen and QEMU?

Marcel
On 27/10/20 9:18 am, Marcel Juffermans wrote:
It's QEMU 4.2.1-lp152.9.6.1.

I've tried updating it from the Open Build Service repos but there's too many version conflicts.

Marcel
On 26/10/20 9:02 pm, Ján Tomko wrote:
On a Friday in 2020, Marcel Juffermans wrote:
Hi there,

Since upgrading to openSUSE 15.2 (which includes libvirt 6.0.0) the virtual guests don't get their RBD disks made available to them. On openSUSE 15.1 (which includes libvirt 5.1.0) that worked fine. The XML is as follows:


[...]

I tried to strace libvirtd. The results are as follows:

On openSUSE 15.2 with libvirt 6.0.0 (not working), we see this:

1682  openat(AT_FDCWD, "rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", O_RDWR|O_CLOEXEC) = -1 ENOENT (No such file or directory)
1682  rt_sigprocmask(SIG_BLOCK, NULL, [BUS USR1 ALRM IO], 8) = 0
1682  mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f538aefd000
1682  mprotect(0x7f538aefd000, 4096, PROT_NONE <unfinished ...>
1682  <... mprotect resumed>)           = 0
1682  rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], [BUS USR1 ALRM IO], 8) = 0
1682  rt_sigprocmask(SIG_BLOCK, NULL, [BUS USR1 ALRM IO], 8) = 0
1682  mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
1682  <... mmap resumed>)               = 0x7f538adfc000
1682  mprotect(0x7f538adfc000, 4096, PROT_NONE <unfinished ...>
1682  <... mprotect resumed>)           = 0
1682  rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], <unfinished ...>
1682  <... rt_sigprocmask resumed>[BUS USR1 ALRM IO], 8) = 0
1682  write(2, "qemu-system-i386: failed to crea"..., 232 <unfinished ...>
...

On the other hand, on openSUSE 15.1 with libvirt 5.1.0 (working), we see this:

16267 openat(AT_FDCWD, "rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", O_RDONLY|O_NONBLOCK|O_CLOEXEC) = -1 ENOENT (No such file or directory) 16267 stat("rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", 0x7fff83e2e2b0) = -1 ENOENT (No such file or directory)
16267 access("/usr/lib64/qemu/block-rbd.so", F_OK) = 0
16267 stat("/usr/lib64/qemu/block-rbd.so", {st_mode=S_IFREG|0644, st_size=27448, ...}) = 0 16267 openat(AT_FDCWD, "/usr/lib64/qemu/block-rbd.so", O_RDONLY|O_CLOEXEC) = 60 16267 read(60, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 &\0\0\0\0\0\0"..., 832) = 832
16267 fstat(60, {st_mode=S_IFREG|0644, st_size=27448, ...}) = 0
16267 mmap(NULL, 2122672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 60, 0) = 0x7f8e6030f000
16267 mprotect(0x7f8e60315000, 2093056, PROT_NONE) = 0
16267 mmap(0x7f8e60514000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 60, 0x5000) = 0x7f8e60514000
16267 close(60)                         = 0
...

Note that the latter opens "/usr/lib64/qemu/block-rbd.so". That library *does* exist on openSUSE 15.2 but it doesn't seem to be used.


The error message comes from QEMU, what QEMU version are you using?

Jano

I've tried to update libvirt to a newer version using the Open Build Service repos, but then ran into so many conflicting versions that I gave up.

At this point I'm stuck. Does anyone have an idea I can try?

Many thanks,

Marcel












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