On Thu, Jan 21, 2016 at 01:16:41PM +0800, kernel test robot wrote:
> [ 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 ]------------
Pretty dumb... the below fixes it for me. Thanks!
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2218,6 +2218,10 @@ static void __sched_fork(unsigned long c
__dl_clear_params(p);
INIT_LIST_HEAD(&p->rt.run_list);
+ p->rt.timeout = 0;
+ p->rt.time_slice = sched_rr_timeslice;
+ p->rt.on_rq = 0;
+ p->rt.on_list = 0;
#ifdef CONFIG_PREEMPT_NOTIFIERS
INIT_HLIST_HEAD(&p->preempt_notifiers);
