On Friday, January 12, 2018 2:32:57 AM CET Tony Lindgren wrote:

* Tony Lindgren [off-list ref] [180111 17:20]:

quoted

Well I tried to measure suspend power consumption and noticed
that system suspend fails too hand hangs the network device:

# echo mem > /sys/power/state
[   32.577850] PM: suspend entry (deep)
[   32.582031] PM: Syncing filesystems ... done.
[   32.598083] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   32.608398] OOM killer disabled.
[   32.611846] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
[   32.622192] Suspending console(s) (use no_console_suspend to debug)
[   32.651123] dpm_run_callback(): mdio_bus_suspend+0x0/0x24 returns 4352
[   32.651428] PM: Device 2c000000.ethernet-ffffffff:01 failed to suspend: error 4352

This looks totally bogus.

First, "error" should be a negative number and we print it as int.

Second, error codes are not in this range anyway.

quoted

[   32.653289] PM: Some devices failed to suspend, or early wake event detected
[   32.685455] OOM killer enabled.
[   32.688629] Restarting tasks ... done.
[   32.695983] PM: suspend exit
ash: write error: Bad address

That too works just fine at commit 70286688e5ad.

Suspend fails at commit e2d7fe89e8ae though, so looks like we
have two separate issues. I'll try to bisect that separately.

BTW, can you please CC PM bug reports to linux-pm?  That may help sometimes.

Thanks,
Rafael