Re: [Xen-devel] bug: unable to LZ4 decompress ub1910 installer kernel when launching domU

[Jeremi Piotrowski <jeremi.piotrowski@xxxxxxxxx>]

On Thu, Oct 24, 2019 at 10:12:19AM +0200, Jan Beulich wrote:
> On 23.10.2019 22:33, Pry Mar wrote:
> > Hello xen-devel,
> > 
> > https://paste.debian.net/plain/1109374
> > 
> > shows my traces from a healthy CentOS 8, xen-4.12.1 dom0 when trying
> > to launch a pv install of the newly released ub1910. The source is a
> > block-attached ISO and the kernel/ramdisk was copied off locally.
> 
> Would you please increase verbosity (xl -vvv create ...) such that we
> can see what exactly the decompression code doesn't like about this
> kernel image?
> 
> Jan
> 

Hi Jan,

I stumbled across the same issue, below is the xl -vvvv create output.

Parsing config from ubuntu.cfg
libxl: debug: libxl_create.c:1693:do_domain_create: Domain 0:ao 0x55a598e77190: 
create: how=(nil) callback=(nil) poller=0x55a598e74040
libxl: debug: libxl_device.c:397:libxl__device_disk_set_backend: Disk vdev=xvda 
spec.backend=unknown
libxl: debug: libxl_device.c:358:disk_try_backend: Disk vdev=xvda, backend phy 
unsuitable due to format qcow2
libxl: debug: libxl_device.c:431:libxl__device_disk_set_backend: Disk 
vdev=xvda, using backend qdisk
libxl: debug: libxl_create.c:1018:initiate_domain_create: Domain 11:running 
bootloader
libxl: debug: libxl_bootloader.c:334:libxl__bootloader_run: Domain 11:no 
bootloader configured, using user supplied kernel
libxl: debug: libxl_event.c:689:libxl__ev_xswatch_deregister: watch 
w=0x55a598e827a8: deregister unregistered
domainbuilder: detail: xc_dom_allocate: cmdline="", features=""
libxl: debug: libxl_dom.c:799:libxl__build_pv: pv kernel mapped 0 path 
/tank/xenscratch/ubuntu/vmlinuz-5.3.0-23-generic
domainbuilder: detail: xc_dom_kernel_file: 
filename="/tank/xenscratch/ubuntu/vmlinuz-5.3.0-23-generic"
domainbuilder: detail: xc_dom_malloc_filemap    : 11132 kB
domainbuilder: detail: xc_dom_boot_xen_init: ver 4.12, caps xen-3.0-x86_64 
xen-3.0-x86_32p 
domainbuilder: detail: xc_dom_parse_image: called
domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary loader ... 
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying HVM-generic loader ... 
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying Linux bzImage loader ... 
domainbuilder: detail: LZ4 decompression error: decoding failed

xc: error: panic: xc_dom_bzimageloader.c:766: xc_dom_probe_bzimage_kernel 
unable to LZ4 decompress kernel
: Invalid kernel
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying ELF-generic loader ... 
domainbuilder: detail: loader probe failed
xc: error: panic: xc_dom_core.c:691: xc_dom_find_loader: no loader found: 
Invalid kernel
libxl: error: libxl_dom.c:737:libxl__build_dom: xc_dom_parse_image failed
domainbuilder: detail: xc_dom_release: called
libxl: error: libxl_create.c:1286:domcreate_rebuild_done: Domain 11:cannot 
(re-)build domain: -3
libxl: debug: libxl_domain.c:1194:devices_destroy_cb: Domain 11:Forked pid 
71592 for destroy of domain
libxl: debug: libxl_create.c:1730:do_domain_create: Domain 0:ao 0x55a598e77190: 
inprogress: poller=0x55a598e74040, flags=i
libxl: debug: libxl_event.c:1873:libxl__ao_complete: ao 0x55a598e77190: 
complete, rc=-3
libxl: debug: libxl_event.c:1842:libxl__ao__destroy: ao 0x55a598e77190: destroy
libxl: debug: libxl_domain.c:902:libxl_domain_destroy: Domain 11:ao 
0x55a598e76db0: create: how=(nil) callback=(nil) poller=0x55a598e74040
libxl: error: libxl_domain.c:1038:libxl__destroy_domid: Domain 11:Non-existant 
domain
libxl: error: libxl_domain.c:993:domain_destroy_callback: Domain 11:Unable to 
destroy guest
libxl: error: libxl_domain.c:920:domain_destroy_cb: Domain 11:Destruction of 
domain failed
libxl: debug: libxl_event.c:1873:libxl__ao_complete: ao 0x55a598e76db0: 
complete, rc=-21
libxl: debug: libxl_domain.c:911:libxl_domain_destroy: Domain 11:ao 
0x55a598e76db0: inprogress: poller=0x55a598e74040, flags=ic
libxl: debug: libxl_event.c:1842:libxl__ao__destroy: ao 0x55a598e76db0: destroy
xencall:buffer: debug: total allocations:75 total releases:75
xencall:buffer: debug: current allocations:0 maximum allocations:3
xencall:buffer: debug: cache current size:3
xencall:buffer: debug: cache hits:61 misses:3 toobig:11
xencall:buffer: debug: total allocations:0 total releases:0
xencall:buffer: debug: current allocations:0 maximum allocations:0
xencall:buffer: debug: cache current size:0
xencall:buffer: debug: cache hits:0 misses:0 toobig:0

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