johnohagan wrote: > The freeze occurs with pm_test set to "processors", but not with > "platform". > > With "single no_console_suspend" on the kernel command-line and > trying STD, the screen messages are normal up to the point of saving > the image, and remain there after the freeze. A natural next step would be to use some printks to find when exactly it is freezing (as illustrated in the patch below)[2]. If it's still not clear after that what's causing it to hang, then bisecting[1] through the -rt patch stack can isolate the specific change that causes it (I can walk you through that). Good luck, Jonathan [1] https://git-core.googlecode.com/git-history/html/git-bisect-lk2009.html [2] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s4.2.3 explains how to build a tweaked Debian kernel package. diff --git i/kernel/power/hibernate.c w/kernel/power/hibernate.c index 2b0c52ff8703..fb8aecc4f11d 100644 --- i/kernel/power/hibernate.c +++ w/kernel/power/hibernate.c @@ -260,6 +260,8 @@ static int create_image(int platform_mode) { int error; + printk("PM debug: creating hibernation image\n"); + error = dpm_suspend_noirq(PMSG_FREEZE); if (error) { printk(KERN_ERR "PM: Some devices failed to power down, " @@ -267,15 +269,19 @@ static int create_image(int platform_mode) return error; } + printk("PM debug: create_image(): pre-snapshot:\n"); error = platform_pre_snapshot(platform_mode); if (error || hibernation_test(TEST_PLATFORM)) goto Platform_finish; + printk("PM debug: create_image(): disable nonboot CPUs:\n"); error = disable_nonboot_cpus(); + printk("PM debug: finished disabling nonboot CPUs\n"); if (error || hibernation_test(TEST_CPUS) || hibernation_testmode(HIBERNATION_TEST)) goto Enable_cpus; + printk("PM debug: a 'processors' test shouldn't get this far\n"); local_irq_disable(); system_state = SYSTEM_SUSPEND; @@ -311,14 +317,18 @@ static int create_image(int platform_mode) local_irq_enable(); Enable_cpus: + printk("PM debug: enabling nonboot CPUs\n"); enable_nonboot_cpus(); Platform_finish: + printk("PM debug: finishing\n"); platform_finish(platform_mode); + printk("PM debug: resume\n"); dpm_resume_noirq(in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); + printk("PM debug: create_image finished\n"); return error; } -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
