On Friday, January 12, 2018 1:23:54 PM CET Rafael J. Wysocki wrote:

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

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

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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.

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[   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.

I guess what may happen is that something started to return positive numbers
which confuse things all over when passed along by its callers as error codes.

Thanks,
Rafael