On Thu, Feb 5, 2015 at 11:09 PM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > On Thu, 5 Feb 2015 22:45:59 +0100 > Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > >> Steve, this was a typo it's called tlb_flush not tlb_flush*ed*: > > Heh, yeah, I typed that entire line in by hand. Just be lucky that was > the only typo ;-) > >> >> # cat /sys/kernel/debug/tracing/events/tlb/tlb_flush/enable >> 1 >> >> [ 391.090381] intel_pstate CPU 1 exiting >> [ 391.104491] smpboot: CPU 1 is now offline >> > > Now, if you disable that (echo 0 to that file), do you still get the > rcu lockdep splat if you suspend and resume? > YES, I get the call-trace again! # cat /sys/kernel/debug/tracing/events/tlb/tlb_flush/enable 0 # cat /sys/devices/system/cpu/cpu1/online 0 [ 2470.606222] intel_pstate CPU 1 exiting [ 2470.628153] [ 2470.628155] =============================== [ 2470.628156] [ INFO: suspicious RCU usage. ] [ 2470.628159] 3.19.0-rc7-next-20150204.9-iniza-small #1 Not tainted [ 2470.628160] ------------------------------- [ 2470.628162] include/trace/events/tlb.h:37 suspicious rcu_dereference_check() usage! [ 2470.628163] [ 2470.628163] other info that might help us debug this: [ 2470.628163] [ 2470.628164] [ 2470.628164] RCU used illegally from offline CPU! [ 2470.628164] rcu_scheduler_active = 1, debug_locks = 0 [ 2470.628165] no locks held by swapper/1/0. [ 2470.628166] [ 2470.628166] stack backtrace: [ 2470.628169] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.19.0-rc7-next-20150204.9-iniza-small #1 [ 2470.628171] Hardware name: SAMSUNG ELECTRONICS CO., LTD. 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013 [ 2470.628176] 0000000000000001 ffff88011a44fe18 ffffffff817ecf4d 0000000000000011 [ 2470.628179] ffff88011a448290 ffff88011a44fe48 ffffffff810d6b57 ffff8800cc2660c0 [ 2470.628182] 0000000000000001 ffffffff81d35160 0000000000000002 ffff88011a44fe78 [ 2470.628183] Call Trace: [ 2470.628192] [<ffffffff817ecf4d>] dump_stack+0x4c/0x65 [ 2470.628198] [<ffffffff810d6b57>] lockdep_rcu_suspicious+0xe7/0x120 [ 2470.628203] [<ffffffff810b7459>] idle_task_exit+0x1c9/0x260 [ 2470.628208] [<ffffffff81054c4e>] play_dead_common+0xe/0x50 [ 2470.628211] [<ffffffff81054ca5>] native_play_dead+0x15/0x140 [ 2470.628216] [<ffffffff8102963f>] arch_cpu_idle_dead+0xf/0x20 [ 2470.628219] [<ffffffff810cdbae>] cpu_startup_entry+0x37e/0x580 [ 2470.628222] smpboot: CPU 1 didn't die... [ 2470.628224] [<ffffffff81053e20>] start_secondary+0x140/0x150 - Sedat - -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
