FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
commit cd0dc98962d9da44725431f5a465292955e93574 ("sched: Fix PI handling vs sched_setscheduler()")


+--------------------------------------------------+------------+------------+
|                                                  | 0923cd774a | cd0dc98962 |
+--------------------------------------------------+------------+------------+
| boot_successes                                   | 12         | 4          |
| boot_failures                                    | 0          | 7          |
| WARNING:at_kernel/sched/rt.c:#dequeue_rt_stack() | 0          | 7          |
| backtrace:_do_fork                               | 0          | 7          |
| backtrace:SyS_clone                              | 0          | 7          |
+--------------------------------------------------+------------+------------+



[   18.125771] Key type id_resolver registered
[   18.126809] Key type id_legacy registered
[   18.469193] ------------[ cut here ]------------
[   18.470790] WARNING: CPU: 1 PID: 645 at kernel/sched/rt.c:1161 dequeue_rt_stack+0x2a1/0x300()
[   18.474113] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sd_mod sr_mod cdrom ata_generic pata_acpi crct10dif_pclmul crc32_pclmul crc32c_intel ppdev snd_pcm snd_timer snd soundcore aesni_intel lrw gf128mul glue_helper ablk_helper cryptd pcspkr serio_raw virtio_scsi ata_piix i2c_piix4 libata floppy parport_pc parport acpi_cpufreq
[   18.488019] CPU: 1 PID: 645 Comm: watchdog Not tainted 4.4.0-00534-gcd0dc98 #1
[   18.491076] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   18.494243]  ffffffff81bb0040 ffff88003fa73d90 ffffffff81413ab2 0000000000000000
[   18.497581]  ffff88003fa73dc8 ffffffff8107a086 ffff88003ec027c0 ffff880037217330
[   18.501000]  0000000000000000 ffff88003ec0308c 0000000000017180 ffff88003fa73dd8
[   18.504206] Call Trace:
[   18.505607]  [<ffffffff81413ab2>] dump_stack+0x4b/0x69
[   18.507326]  [<ffffffff8107a086>] warn_slowpath_common+0x86/0xc0
[   18.509291]  [<ffffffff8107a17a>] warn_slowpath_null+0x1a/0x20
[   18.511117]  [<ffffffff810b9e71>] dequeue_rt_stack+0x2a1/0x300
[   18.513048]  [<ffffffff810ba264>] enqueue_rt_entity+0x24/0x50
[   18.514803]  [<ffffffff810ba930>] enqueue_task_rt+0x30/0x60
[   18.516582]  [<ffffffff810a357e>] activate_task+0x5e/0x80
[   18.518443]  [<ffffffff810a57ec>] wake_up_new_task+0xec/0x1d0
[   18.520254]  [<ffffffff81079469>] _do_fork+0xd9/0x380
[   18.522064]  [<ffffffff810797b9>] SyS_clone+0x19/0x20
[   18.523710]  [<ffffffff818caeae>] entry_SYSCALL_64_fastpath+0x12/0x71
[   18.525861] ---[ end trace 7604fe74e13e21d2 ]---
[   18.527238] ------------[ cut here ]------------





Thanks,
Kernel Test Robot