While doing cpu hotunplug on s390 I got the following warning which indicates
that
Matts new check is either broken or finds real bugs.
[ 190.608421] rq->clock_update_flags < RQCF_ACT_SKIP
[ 190.608427] ------------[ cut here ]------------
[ 190.608434] WARNING: CPU: 29 PID: 153 at kernel/sched/sched.h:812
set_next_entity+0xc5e/0xc98
[ 190.608435] Kernel panic - not syncing: panic_on_warn set ...
[ 190.608437] CPU: 29 PID: 153 Comm: migration/29 Not tainted 4.10.0+ #377
[ 190.608437] Hardware name: IBM 2964 NC9 704
(LPAR)
[ 190.608438] Stack:
[ 190.608438] 000000fb8ab875b8 000000fb8ab87648 0000000000000003
0000000000000000
[ 190.608439] 000000fb8ab876e8 000000fb8ab87660 000000fb8ab87660
0000000000000020
[ 190.608441] 000000000069dc1e 0000000000000020 000000000000000a
000000000000000a
[ 190.608442] 000000000000000c 000000fb8ab876b0 0000000000000000
0000000000000000
[ 190.608443] 0000000000935d60 00000000001125ec 000000fb8ab87648
000000fb8ab876a0
[ 190.608444] Call Trace:
[ 190.608448] ([<00000000001124a2>] show_trace+0x62/0x78)
[ 190.608449] [<0000000000112590>] show_stack+0x68/0xe0
[ 190.608453] [<0000000000666c0e>] dump_stack+0x7e/0xb0
[ 190.608456] [<000000000027c704>] panic+0x104/0x240
[ 190.608457] [<0000000000140cd8>] cpuhp_invoke_callback+0x0/0x578
[ 190.608458] [<0000000000666376>] report_bug+0xce/0x150
[ 190.608459] [<0000000000100b10>] do_report_trap+0xf0/0x108
[ 190.608460] [<0000000000100c7e>] illegal_op+0xc6/0x160
[ 190.608464] [<000000000092bbfc>] pgm_check_handler+0x150/0x1a4
[ 190.608465] [<0000000000184906>] set_next_entity+0xc5e/0xc98
[ 190.608466] ([<0000000000184902>] set_next_entity+0xc5a/0xc98)
[ 190.608467] [<000000000018a278>] pick_next_task_fair+0xa8/0x5b8
[ 190.608468] [<0000000000176ba8>] sched_cpu_dying+0x260/0x380
[ 190.608469] [<0000000000140d96>] cpuhp_invoke_callback+0xbe/0x578
[ 190.608470] [<0000000000141b70>] take_cpu_down+0x88/0xe0
[ 190.608472] [<00000000002015d6>] multi_cpu_stop+0x106/0x130
[ 190.608473] [<000000000020188c>] cpu_stopper_thread+0xf4/0x198
[ 190.608475] [<000000000016a754>] smpboot_thread_fn+0x134/0x1d0
[ 190.608478] [<00000000001658ea>] kthread+0x13a/0x158
[ 190.608479] [<000000000092baa6>] kernel_thread_starter+0x6/0xc
[ 190.608480] [<000000000092baa0>] kernel_thread_starter+0x0/0xc
Any immediate idea?
Christian
