lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 11 Jan 2021 20:42:54 -0800 (PST)
From:   Hugh Dickins <>
To:     Saravana Kannan <>
cc:     Hugh Dickins <>,
        "Rafael J. Wysocki" <>,
        Thierry Reding <>,
        Jonathan Hunter <>,
        Greg Kroah-Hartman <>,
        Vincent Huang <>,
        "Jason A. Donenfeld" <>,
        Andrew Duggan <>,
        Lucas Stach <>,
        Linux Kernel Mailing List <>,
        Linux PM <>
Subject: Re: 5.11-rc device reordering breaks ThinkPad rmi4 suspend

On Mon, 11 Jan 2021, Saravana Kannan wrote:
> On Mon, Jan 11, 2021 at 4:44 PM Hugh Dickins <> wrote:
> > On Mon, 11 Jan 2021, Saravana Kannan wrote:
> > >
> > > Did you see this patch change the organization of devices under /sys/devices/?
> > > The rmi* devices need to be under one of the i2c devices after this
> > > patch. Is that not the case? Or is that the case, but you are still
> > > seeing suspend/resume issues?
> >
> > Now that I look, yes, that patch has moved the directory
> > /sys/devices/rmi4-00
> > to
> > /sys/devices/pci0000:00/0000:00:1f.4/i2c-6/6-002c/rmi4-00
> What about child devices of rmi4-00? Does it still have the
> rmi4-00.fn* devices as children? I'd think so, but just double
> checking.

Yes, the patch moved the rmi4-00 directory and its contents.

> >
> > But I still see the same suspend issues despite that.
> Can you please get new logs to see if the failure reasons are still
> the same? I'd think this parent/child relationship would at least
> avoid the "Failed to read irqs" errors that seem to be due to I2C
> dependency.

No, it did not avoid the "Failed to read irqs" error (though my
recollection from earlier failures before I mailed out, is that
that particular error is intermittent: sometimes it showed up,
other times not; but always the "Failed to write sleep mode").

I configured CONFIG_PM_DEBUG=y and booted with pm_debug_messages
this time, dmesgsys.tar attached, contents:

dmesg.rc3	# dmesg of boot and attempt to suspend on 5.11-rc3
sys.rc3		# find /sys | sort | grep -v /sys/fs/cgroup afterwards
dmesg.saravana	# dmesg of boot and attempt to suspend with your patch
sys.saravana	# find /sys | sort | grep -v /sys/fs/cgroup afterwards
dmesg.revert	# dmesg of boot+suspend+resume, rc3 without 5b6164d3465f
sys.revert	# find /sys | sort | grep -v /sys/fs/cgroup afterwards

Not as many debug messages as I was expecting: perhaps you can point
me to something else to tune to get more info out? And perhaps it was
a mistake to snapshot the /sys hierarchy after rather than before:
I see now that it does make some difference.  I filtered out
/sys/fs/cgroup because that enlarged the diffs with no relevance.

Download attachment "dmesgsys.tar" of type "APPLICATION/x-tar" (99912 bytes)

Powered by blists - more mailing lists