Created attachment 130040 [details] dmesg log with failed suspend On KBL IGT suspend-to-mem tests fail with the following trace. This ticket is for CI/IGT tracking only, I opened a corresponding upstream ticket: https://bugzilla.kernel.org/show_bug.cgi?id=194771 [ 244.186724] PM: Preparing system for sleep (mem) [ 244.190427] Freezing user space processes ... [ 264.199520] Freezing of tasks failed after 20.009 seconds (1 tasks refusing to freeze, +wq_busy=0): [ 264.199722] systemd-udevd D 0 319 281 0x00000004 [ 264.199785] Call Trace: [ 264.199819] __schedule+0x30e/0xbd0 [ 264.199848] schedule+0x3b/0x90 [ 264.199867] schedule_timeout+0x23b/0x490 [ 264.199886] ? _raw_spin_unlock_irq+0x27/0x50 [ 264.199904] ? __this_cpu_preempt_check+0x13/0x20 [ 264.199923] ? trace_hardirqs_on_caller+0xe7/0x200 [ 264.199947] wait_for_common+0x11a/0x1d0 [ 264.200075] ? wake_up_q+0x70/0x70 [ 264.200100] wait_for_completion+0x18/0x20 [ 264.200118] cpuhp_issue_call+0x9b/0xd0 [ 264.200137] __cpuhp_setup_state+0xe9/0x170 [ 264.200159] ? coretemp_remove+0x60/0x60 [coretemp] [ 264.200174] ? 0xffffffffa0275000 [ 264.200197] coretemp_init+0x8b/0x1000 [coretemp] [ 264.200217] do_one_initcall+0x3f/0x170 [ 264.200236] ? rcu_read_lock_sched_held+0x75/0x80 [ 264.200255] ? kmem_cache_alloc_trace+0x274/0x2e0 [ 264.200269] ? do_init_module+0x22/0x1fb [ 264.200311] load_module+0x2091/0x2410 [ 264.200326] ? symbol_put_addr+0x60/0x60 [ 264.200356] ? kernel_read_file+0x105/0x190 [ 264.200389] SyS_finit_module+0xbc/0xf0 [ 264.200424] entry_SYSCALL_64_fastpath+0x1c/0xb1
*** Bug 100124 has been marked as a duplicate of this bug. ***
Assuming fixed by upstream commit commit dc434e056fe1dada20df7ba07f32739d3a701adf Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Tue Mar 14 16:06:45 2017 +0100 cpu/hotplug: Serialize callback invocations proper
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