On 24.06.20 18:09, Luis Chamberlain wrote:

On Wed, Jun 24, 2020 at 05:54:46PM +0200, Christian Borntraeger wrote:

quoted

On 24.06.20 16:43, Christoph Hellwig wrote:

quoted

On Wed, Jun 24, 2020 at 01:11:54PM +0200, Christian Borntraeger wrote:

quoted

Does anyone have an idea why "umh: fix processed error when UMH_WAIT_PROC is used" breaks the
linux-bridge on s390?

Are we even sure this is s390 specific and doesn't happen on other
architectures with the same bridge setup?

Fair point. AFAIK nobody has tested this yet on x86.

Regardless, can you enable dynamic debug prints, to see if the kernel
reveals anything on the bridge code which may be relevant:

echo "file net/bridge/* +p" > /sys/kernel/debug/dynamic_debug/control

  Luis

When I start a guest the following happens with the patch:

[   47.420237] virbr0: port 2(vnet0) entered blocking state
[   47.420242] virbr0: port 2(vnet0) entered disabled state
[   47.420315] device vnet0 entered promiscuous mode
[   47.420365] virbr0: port 2(vnet0) event 16
[   47.420366] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   47.420373] virbr0: toggle option: 12 state: 0 -> 0
[   47.420536] virbr0: port 2(vnet0) entered blocking state
[   47.420538] virbr0: port 2(vnet0) event 16
[   47.420539] virbr0: br_fill_info event 16 port vnet0 master virbr0

and the nothing happens.


without the patch
[   33.805410] virbr0: hello timer expired
[   35.805413] virbr0: hello timer expired
[   36.184349] virbr0: port 2(vnet0) entered blocking state
[   36.184353] virbr0: port 2(vnet0) entered disabled state
[   36.184427] device vnet0 entered promiscuous mode
[   36.184479] virbr0: port 2(vnet0) event 16
[   36.184480] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   36.184487] virbr0: toggle option: 12 state: 0 -> 0
[   36.184636] virbr0: port 2(vnet0) entered blocking state
[   36.184638] virbr0: port 2(vnet0) entered listening state
[   36.184639] virbr0: port 2(vnet0) event 16
[   36.184640] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   36.184645] virbr0: port 2(vnet0) event 16
[   36.184646] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   37.805478] virbr0: hello timer expired
[   38.205413] virbr0: port 2(vnet0) forward delay timer
[   38.205414] virbr0: port 2(vnet0) entered learning state
[   38.205427] virbr0: port 2(vnet0) event 16
[   38.205430] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   38.765414] virbr0: port 2(vnet0) hold timer expired
[   39.805415] virbr0: hello timer expired
[   40.285410] virbr0: port 2(vnet0) forward delay timer
[   40.285411] virbr0: port 2(vnet0) entered forwarding state
[   40.285418] virbr0: topology change detected, propagating
[   40.285420] virbr0: decreasing ageing time to 400
[   40.285427] virbr0: port 2(vnet0) event 16
[   40.285432] virbr0: br_fill_info event 16 port vnet0 master virbr0
[   40.765408] virbr0: port 2(vnet0) hold timer expired
[   41.805415] virbr0: hello timer expired
[   42.765426] virbr0: port 2(vnet0) hold timer expired
[   43.805425] virbr0: hello timer expired
[   44.765426] virbr0: port 2(vnet0) hold timer expired
[   45.805418] virbr0: hello timer expired

and continuing....