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

[Marcel Juffermans]

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
>>
>>
>>
>>
>>
>>