Rafael, Mika, Bjorn and Tomas, can't explain exactly what causes breakage between MEI and PM first seen on v4.13-rc2 (ther was a typo in the orignal message), but I was able to bisect it down to commit [de3ef1eb1cd0cc3a75f7a3661e10ed827f370ab8] PM / core: Drop run_wake flag from struct dev_pm_info Here's the original bug report with the reply by the maintainer: On Sun, Jul 30, 2017 at 09:16:56AM +0000, Winkler, Tomas wrote: > > -----Original Message----- > > From: Dominik Brodowski [mailto:linux@xxxxxxxxxxxxxxxxxxxx] > > Sent: Sunday, July 30, 2017 11:59 > > To: Winkler, Tomas <tomas.winkler@xxxxxxxxx> > > Cc: Usyskin, Alexander <alexander.usyskin@xxxxxxxxx>; linux- > > kernel@xxxxxxxxxxxxxxx > > Subject: MEI-related WARN_ON() triggered during resume-from-sleep on > > v4.12-rc2+ > > > > Thomas, > > > > on Linus' most recent kernel (v4.12-rc2, git head 0a07b238e5f48), I see the > > following message on my Dell XPS13 when resuming from sleep. MEI is, > > AFAIK, not being used on this system: > > > > Thanks for the report, we haven't change the logic of this code since 4.12 so we need to look for > changes in pci and/or pm subsystems. We try to bisect it. > > Thanks > > > > > [ 192.940537] Restarting tasks ... > > [ 192.940610] PGI is not set > > [ 192.940619] ------------[ cut here ]------------ [ 192.940623] WARNING: CPU: 0 > > PID: 1661 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw- > > me.c:653 mei_me_pg_exit_sync+0x351/0x360 [ 192.940624] Modules linked > > in: > > [ 192.940627] CPU: 0 PID: 1661 Comm: kworker/0:3 Not tainted 4.13.0-rc2+ > > #2 [ 192.940628] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11 > > 12/08/2016 [ 192.940630] Workqueue: pm pm_runtime_work <snip> [ > > 192.940642] Call Trace: > > [ 192.940646] ? pci_pme_active+0x1de/0x1f0 [ 192.940649] ? > > pci_restore_standard_config+0x50/0x50 > > [ 192.940651] ? kfree+0x172/0x190 > > [ 192.940653] ? kfree+0x172/0x190 > > [ 192.940655] ? pci_restore_standard_config+0x50/0x50 > > [ 192.940663] mei_me_pm_runtime_resume+0x3f/0xc0 > > [ 192.940665] pci_pm_runtime_resume+0x7a/0xa0 [ 192.940667] > > __rpm_callback+0xb9/0x1e0 [ 192.940668] ? > > preempt_count_add+0x6d/0xc0 [ 192.940670] rpm_callback+0x24/0x90 [ > > 192.940672] ? pci_restore_standard_config+0x50/0x50 > > [ 192.940674] rpm_resume+0x4e8/0x800 > > [ 192.940676] pm_runtime_work+0x55/0xb0 [ 192.940678] > > process_one_work+0x184/0x3e0 [ 192.940680] worker_thread+0x4d/0x3a0 [ > > 192.940681] ? preempt_count_sub+0x9b/0x100 [ 192.940683] > > kthread+0x122/0x140 [ 192.940684] ? process_one_work+0x3e0/0x3e0 [ > > 192.940685] ? __kthread_create_on_node+0x1a0/0x1a0 > > [ 192.940688] ret_from_fork+0x27/0x40 > > [ 192.940690] Code: 96 3a 9e ff 48 8b 7d 98 e8 cd 21 58 00 83 bb bc 01 00 00 > > 04 0f 85 40 fe ff ff e9 41 fe ff ff 48 c7 c7 5f 04 99 96 e8 93 6b 9f ff <0f> ff e9 5d > > fd ff ff e8 33 fe 99 ff 0f 1f 00 0f 1f 44 00 00 55 [ 192.940719] ---[ end trace > > a86955597774ead8 ]--- [ 192.942540] done. > > > > This doesn't / didn't happen on v4.12. By using the dynamic_debug infrastructure, I was able to obtain a few more data points: Running 0847684cfc5f, when suspending the system to ram and resuming again, I see the following messages: [ 614.936773] sd 3:0:0:0: [sda] Stopping disk [ 614.956004] mei_me 0000:00:16.0: rpm: me: runtime resume [ 614.956165] ACPI : EC: event blocked [ 614.980164] mei_me 0000:00:16.0: interrupt source 0x00000002 [ 614.980191] mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing. ... [ 615.266896] Suspended for 1.190 seconds ... [ 615.455775] sd 3:0:0:0: [sda] Starting disk [ 615.455855] mei_me 0000:00:16.0: interrupt source 0x00000002 [ 615.455870] mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing. [ 615.455877] mei_me 0000:00:16.0: we need to start the dev. and everything works fine as expected (no WARN(), no stack trace, nothing dubious). Running de3ef1eb1cd0 instead, when suspending, I see *no* mei_me-related message. During resume, the stack trace already noted above for v4.13-rc2+ appears again: [ 80.333909] sd 3:0:0:0: [sda] Stopping disk [ 80.535777] psmouse serio1: Failed to disable mouse on isa0060/serio1 [ 80.983510] ACPI : EC: event blocked [ 81.065510] PM: suspend of devices complete after 734.074 msecs ... [ 82.137038] Restarting tasks ... [ 82.143986] mei_me 0000:00:16.0: rpm: me: runtime resume [ 82.143989] PGI is not set [ 82.144001] ------------[ cut here ]------------ [ 82.144008] WARNING: CPU: 3 PID: 1881 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw-me.c:653 mei_me_pg_exit_sync+0x351/0x360 [ 82.144009] Modules linked in: [ 82.144012] CPU: 3 PID: 1881 Comm: kworker/3:5 Not tainted 4.12.0-rc5+ #3 [ 82.144013] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11 12/08/2016 ... [ 82.144017] Workqueue: pm pm_runtime_work [ 82.144019] task: ffff964a91b35700 task.stack: ffffa51b43508000 [ 82.144022] RIP: 0010:mei_me_pg_exit_sync+0x351/0x360 ... [ 82.144156] ---[ end trace 5827b2fcedec4bc9 ]--- [ 82.144272] done. ... [ 83.194425] mei_me 0000:00:16.0: rpm: me: runtime resume ret = -62 [ 83.194460] mei_me 0000:00:16.0: unexpected reset: dev_state = ENABLED fw status = 1E000245 6000A106 00000200 00004400 00000101 43C00ED9 ... Any ideas? Best, Dominik PS @Tomas: Sorry for mistyping your first name in the previous message.
Attachment:
signature.asc
Description: PGP signature
