On 01/22/2016 03:19 PM, Sebastian Andrzej Siewior wrote:
On 01/22/2016 01:24 PM, Grygorii Strashko wrote:
I can see below backtrace during boot if i backport this change in K4.1-rt
TI am437x-idk (UP) board.
[ 0.204022] Switched to clocksource arm_global_timer
[ 0.211982] ------------[ cut here ]------------
[ 0.212021] WARNING: CPU: 0 PID: 3 at kernel/softirq.c:894
__tasklet_action+0x150/0x17c()
[ 0.212027] Modules linked in:
[ 0.212041] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted
4.1.15-rt11-00324-g52f8148-dirty #117
[ 0.212046] Hardware name: Generic AM43 (Flattened Device Tree)
[ 0.212052] Backtrace:
[ 0.212080] [<c0012b50>] (dump_backtrace) from [<c0012d70>]
(show_stack+0x18/0x1c)
[ 0.212085] r7:c0730a84 r6:0000037e r5:00000009 r4:00000000
[ 0.212112] [<c0012d58>] (show_stack) from [<c05e6940>]
(dump_stack+0x20/0x28)
[ 0.212124] [<c05e6920>] (dump_stack) from [<c003713c>]
(warn_slowpath_common+0x7c/0xb4)
[ 0.212134] [<c00370c0>] (warn_slowpath_common) from [<c0037218>]
(warn_slowpath_null+0x24/0x2c)
[ 0.212138] r8:000f4240 r7:00000000 r6:c0841238 r5:00000018 r4:00000006
[ 0.212156] [<c00371f4>] (warn_slowpath_null) from [<c003a0a4>]
(__tasklet_action+0x150/0x17c)
[ 0.212165] [<c0039f54>] (__tasklet_action) from [<c003a138>]
(tasklet_action+0x30/0x38)
[ 0.212169] r9:04208140 r8:c0862300 r7:000000c0 r6:c082d774 r5:00000018
r4:00000006
[ 0.212187] [<c003a108>] (tasklet_action) from [<c0039c2c>]
(do_current_softirqs+0x190/0x258)
[ 0.212197] [<c0039a9c>] (do_current_softirqs) from [<c003a170>]
(run_ksoftirqd+0x30/0x58)
[ 0.212201] r10:00000000 r9:00000000 r8:00000002 r7:c082d8f0 r6:00000001
r5:ee81f740
[ 0.212213] r4:ee874000
[ 0.212227] [<c003a140>] (run_ksoftirqd) from [<c00534e0>]
(smpboot_thread_fn+0x15c/0x278)
[ 0.212242] [<c0053384>] (smpboot_thread_fn) from [<c00500fc>]
(kthread+0xcc/0xe4)
[ 0.212246] r9:00000000 r8:00000000 r7:c0053384 r6:ee81f740 r5:ee81f780
r4:00000000
[ 0.212265] [<c0050030>] (kthread) from [<c000f988>]
(ret_from_fork+0x14/0x2c)
[ 0.212269] r7:00000000 r6:00000000 r5:c0050030 r4:ee81f780
[ 0.212279] ---[ end trace 0000000000000001 ]---
[ 0.212284] softirq: ================== c037d4c4 <---- t->func
^^
# grep c037d4c4 System.map
c037d4c4 t kbd_bh
Do you still see it with the missing lazy bits? I don't see where this
could come from.
yep. I've tried it with and without changing _TIF_WORK_MASK
Seems It's triggered by Virtual terminal keyboard_tasklet
--
regards,
-grygorii
