[Bug 217350] New: kdump kernel hangs in powerkvm guest

[Bug 217350] New: kdump kernel hangs in powerkvm guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=217350

            Bug ID: 217350
           Summary: kdump kernel hangs in powerkvm guest
           Product: Platform Specific/Hardware
           Version: 2.5
          Hardware: PPC-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: PPC-64
          Assignee: platform_ppc-64@kernel-bugs.osdl.org
          Reporter: piliu@redhat.com
        Regression: No

Created attachment 304157
  --> https://bugzilla.kernel.org/attachment.cgi?id=304157&action=edit
The xml to configure the virtual machine

This bug has been observed at least since kernel version 5.19.

The kdump kernel command line:
[    0.000000] Kernel command line: elfcorehdr=0x22c00000  no_timer_check
net.ifnames=0 console=tty0 console=hvc0,115200n8  irqpoll maxcpus=1
noirqdistrib reset_devices cgroup_disable=memory
     numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0
transparent_hugepage=never novmcoredd hugetlb_cma=0 


Finally, the system hangs:
    [    7.763260] virtio_blk virtio2: 32/0/0 default/read/poll queues
    [    7.771391] virtio_blk virtio2: [vda] 20971520 512-byte logical blocks
(10.7 GB/10.0 GiB)
    [   68.398234] systemd-udevd[187]: virtio2: Worker [190] processing
SEQNUM=1193 is taking a long time
    [  188.398258] systemd-udevd[187]: virtio2: Worker [190] processing
SEQNUM=1193 killed

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[Bug 217350] kdump kernel hangs in powerkvm guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=217350

Coiby (coiby.xu@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clg@kaod.org,
                   |                            |coiby.xu@gmail.com

--- Comment #1 from Coiby (coiby.xu@gmail.com) ---
Hi Cédric,

My bisection [1] shows this is a regression caused by your patch it's a
regression caused by "[PATCH 00/31] powerpc: Modernize the PCI/MSI support". 
Do you have any suggestion to fix this bug? Thanks!

[1] https://bugzilla.redhat.com/show_bug.cgi?id=2123723

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[Bug 217350] kdump kernel hangs in powerkvm guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=217350

--- Comment #2 from Cédric Le Goater (clg@kaod.org) ---
Hello  Pingfan,

This was a large series. Did you identify the exact patch ?  It should be 
related to the powerpc/pseries/pci or powerpc/xive subsystem.

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