On Sat, 2011-09-10 at 11:12 +0200, Thomas Gleixner wrote:
> Dear RT Folks,
>
> I'm pleased to announce the 3.0.4-rt13 release.
>
> Changes versus 3.0.2-rt11
>
> * Migrate disable cure (Mike, Peter)
The warning triggers.
[ 134.105241] ------------[ cut here ]------------
[ 134.105249] WARNING: at kernel/sched.c:6146 migrate_disable+0x1ae/0x1f0()
[ 134.105250] Hardware name: MS-7502
[ 134.105252] Modules linked in: snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd nfsd lockd nfs_acl auth_rpcgss sunrpc parport_pc parport bridge ipv6 stp cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave acpi_cpufreq microcode mperf nls_iso8859_1 nls_cp437 vfat fat fuse ext3 jbd dm_mod snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep kvm_intel kvm snd_pcm usb_storage usb_libusual uas snd_timer snd sr_mod cdrom firewire_ohci sg firewire_core e1000e soundcore snd_page_alloc crc_itu_t i2c_i801 button ext4 mbcache jbd2 crc16 usbhid hid uhci_hcd sd_mod ehci_hcd usbcore rtc_cmos ahci libahci libata scsi_mod fan processor thermal
[ 134.105291] Pid: 6224, comm: lmsched Not tainted 3.0.4-rt13 #2040
[ 134.105293] Call Trace:
[ 134.105298] [<ffffffff8103e25a>] warn_slowpath_common+0x7a/0xb0
[ 134.105300] [<ffffffff8103e2a5>] warn_slowpath_null+0x15/0x20
[ 134.105303] [<ffffffff810360de>] migrate_disable+0x1ae/0x1f0
[ 134.105307] [<ffffffff8104f3e2>] do_sigtimedwait+0x62/0x1c0
[ 134.105310] [<ffffffff8104f5c4>] sys_rt_sigtimedwait+0x84/0xd0
[ 134.105314] ------------[ cut here ]------------
[ 134.105324] WARNING: at kernel/sched.c:6146 migrate_disable+0x1ae/0x1f0()
[ 134.105329] [<ffffffff8105a215>] ? sys_timer_settime+0x185/0x220
[ 134.105331] Hardware name: MS-7502
[ 134.105334] Modules linked in: [<ffffffff8130983b>] system_call_fastpath+0x16/0x1b
[ 134.105341] snd_pcm_oss
[ 134.105343] ---[ end trace 0000000000000002 ]---
[ 134.105346] snd_mixer_oss
[ 134.105348] ------------[ cut here ]------------
[ 134.105351] snd_seq
[ 134.105354] WARNING: at kernel/sched.c:6205 migrate_enable+0x200/0x280()
[ 134.105357] snd_seq_device
[ 134.105359] Hardware name: MS-7502
[ 134.105363] ------------[ cut here ]------------
[ 134.105369] edd
[ 134.105370] Modules linked in:
[ 134.105376] WARNING: at kernel/sched.c:6205 migrate_enable+0x200/0x280()
[ 134.105384] nfsd snd_pcm_oss
[ 134.105387] Hardware name: MS-7502
[ 134.105391] lockd snd_mixer_oss
[ 134.105393] Modules linked in: nfs_acl snd_seq snd_pcm_oss auth_rpcgss snd_seq_device snd_mixer_oss sunrpc edd snd_seq parport_pc nfsd snd_seq_device parport lockd edd bridge nfs_acl nfsd ipv6 auth_rpcgss lockd stp sunrpc nfs_acl cpufreq_conservative parport_pc auth_rpcgss cpufreq_ondemand parport sunrpc cpufreq_userspace bridge parport_pc cpufreq_powersave ipv6 parport acpi_cpufreq stp bridge microcode cpufreq_conservative ipv6 mperf cpufreq_ondemand stp nls_iso8859_1 cpufreq_userspace cpufreq_conservative nls_cp437 cpufreq_powersave cpufreq_ondemand vfat acpi_cpufreq cpufreq_userspace fat microcode cpufreq_powersave fuse mperf acpi_cpufreq ext3 nls_iso8859_1 microcode jbd nls_cp437 mperf dm_mod vfat nls_iso8859_1 snd_hda_codec_realtek fat nls_cp437 snd_hda_intel fuse vfat snd_hda_codec ext3 fat snd_hwdep jbd fuse kvm_intel dm_mod ext3 kvm snd_hda_codec_realtek jbd snd_pcm snd_hda_intel dm_mod usb_storage snd_hda_codec snd_hda_codec_realtek usb_libusual snd_hwdep snd_hda_intel uas kvm_intel snd_hda_codec snd_timer kvm snd_hwdep snd snd_pcm kvm_intel sr_mod usb_storage kvm cdrom usb_libusual snd_pcm firewire_ohci uas usb_storage sg snd_timer usb_libusual firewire_core snd uas e1000e sr_mod snd_timer soundcore cdrom snd snd_page_alloc firewire_ohci sr_mod crc_itu_t sg cdrom i2c_i801 firewire_core firewire_ohci button e1000e sg ext4 soundcore firewire_core mbcache snd_page_alloc e1000e jbd2 crc_itu_t soundcore crc16 i2c_i801 snd_page_alloc usbhid button crc_itu_t hid ext4 i2c_i801 uhci_hcd mbcache button sd_mod jbd2 ext4 ehci_hcd crc16 mbcache usbcore usbhid jbd2 rtc_cmos hid crc16 ahci uhci_hcd usbhid libahci sd_mod hid libata ehci_hcd uhci_hcd scsi_mod usbcore sd_mod fan rtc_cmos ehci_hcd processor ahci usbcore thermal libahci rtc_cmos
[ 134.105548] libata ahciPid: 6220, comm: lmsched Tainted: G W 3.0.4-rt13 #2040
[ 134.105553] scsi_mod libahciCall Trace:
[ 134.105559] fan libata processor scsi_mod thermal fan [<ffffffff8103e25a>] warn_slowpath_common+0x7a/0xb0
[ 134.105566]
[ 134.105568] processorPid: 6224, comm: lmsched Tainted: G W 3.0.4-rt13 #2040
[ 134.105577] thermal [<ffffffff8103e2a5>] warn_slowpath_null+0x15/0x20
[ 134.105582] Call Trace:
[ 134.105584]
[ 134.105588] Pid: 6222, comm: lmsched Tainted: G W 3.0.4-rt13 #2040
[ 134.105596] [<ffffffff810360de>] migrate_disable+0x1ae/0x1f0
[ 134.105599] [<ffffffff8103e25a>] warn_slowpath_common+0x7a/0xb0
[ 134.105606] Call Trace:
[ 134.105611] [<ffffffff8104f3e2>] do_sigtimedwait+0x62/0x1c0
[ 134.105614] [<ffffffff8103e2a5>] warn_slowpath_null+0x15/0x20
[ 134.105622] [<ffffffff8103e25a>] warn_slowpath_common+0x7a/0xb0
[ 134.105631] [<ffffffff8104f5c4>] sys_rt_sigtimedwait+0x84/0xd0
[ 134.105635] [<ffffffff81035eb0>] migrate_enable+0x200/0x280
[ 134.105642] [<ffffffff8103e2a5>] warn_slowpath_null+0x15/0x20
[ 134.105650] [<ffffffff81307547>] ? preempt_schedule_irq+0x37/0x50
[ 134.105655] [<ffffffff8104f4df>] do_sigtimedwait+0x15f/0x1c0
[ 134.105664] [<ffffffff81035eb0>] migrate_enable+0x200/0x280
[ 134.105672] [<ffffffff81309346>] ? retint_kernel+0x26/0x30
[ 134.105676] [<ffffffff8104f5c4>] sys_rt_sigtimedwait+0x84/0xd0
[ 134.105683] [<ffffffff8104f4df>] do_sigtimedwait+0x15f/0x1c0
[ 134.105691] [<ffffffff8130983b>] system_call_fastpath+0x16/0x1b
[ 134.105694] [<ffffffff8105a215>] ? sys_timer_settime+0x185/0x220
[ 134.105703] [<ffffffff8104f5c4>] sys_rt_sigtimedwait+0x84/0xd0
[ 134.105710] ---[ end trace 0000000000000003 ]---
[ 134.105714] [<ffffffff8130983b>] system_call_fastpath+0x16/0x1b
[ 134.105721] [<ffffffff8105a215>] ? sys_timer_settime+0x185/0x220
[ 134.105726] ------------[ cut here ]------------
[ 134.105729] ---[ end trace 0000000000000004 ]---
[ 134.105735] WARNING: at kernel/sched.c:6205 migrate_enable+0x200/0x280()
[ 134.105739] [<ffffffff8130983b>] system_call_fastpath+0x16/0x1b
[ 134.105742] Hardware name: MS-7502
[ 134.105744] ---[ end trace 0000000000000005 ]---
[ 134.105746] Modules linked in: snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd nfsd lockd nfs_acl auth_rpcgss sunrpc parport_pc parport bridge ipv6 stp cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave acpi_cpufreq microcode mperf nls_iso8859_1 nls_cp437 vfat fat fuse ext3 jbd dm_mod snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep kvm_intel kvm snd_pcm usb_storage usb_libusual uas snd_timer snd sr_mod cdrom firewire_ohci sg firewire_core e1000e soundcore snd_page_alloc crc_itu_t i2c_i801 button ext4 mbcache jbd2 crc16 usbhid hid uhci_hcd sd_mod ehci_hcd usbcore rtc_cmos ahci libahci libata scsi_mod fan processor thermal
[ 134.105769] Pid: 6220, comm: lmsched Tainted: G W 3.0.4-rt13 #2040
[ 134.105771] Call Trace:
[ 134.105773] [<ffffffff8103e25a>] warn_slowpath_common+0x7a/0xb0
[ 134.105775] [<ffffffff8103e2a5>] warn_slowpath_null+0x15/0x20
[ 134.105777] [<ffffffff81035eb0>] migrate_enable+0x200/0x280
[ 134.105779] [<ffffffff8104f4df>] do_sigtimedwait+0x15f/0x1c0
[ 134.105782] [<ffffffff8104f5c4>] sys_rt_sigtimedwait+0x84/0xd0
[ 134.105784] [<ffffffff81307547>] ? preempt_schedule_irq+0x37/0x50
[ 134.105786] [<ffffffff81309346>] ? retint_kernel+0x26/0x30
[ 134.105789] [<ffffffff8130983b>] system_call_fastpath+0x16/0x1b
[ 134.105791] ---[ end trace 0000000000000006 ]---
(gdb) list *do_sigtimedwait+0x62
0xffffffff8104f3e2 is in do_sigtimedwait (kernel/signal.c:2628).
2623 * Invert the set of allowed signals to get those we want to block.
2624 */
2625 sigdelsetmask(&mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2626 signotset(&mask);
2627
2628 spin_lock_irq(&tsk->sighand->siglock);
2629 sig = dequeue_signal(tsk, &mask, info);
2630 if (!sig && timeout) {
2631 /*
2632 * None ready, temporarily unblock those we're interested
(gdb) list *do_sigtimedwait+0x15f
0xffffffff8104f4df is in do_sigtimedwait (kernel/signal.c:2642).
2637 tsk->real_blocked = tsk->blocked;
2638 sigandsets(&tsk->blocked, &tsk->blocked, &mask);
2639 recalc_sigpending();
2640 spin_unlock_irq(&tsk->sighand->siglock);
2641
2642 timeout = schedule_timeout_interruptible(timeout);
2643
2644 spin_lock_irq(&tsk->sighand->siglock);
2645 __set_task_blocked(tsk, &tsk->real_blocked);
2646 siginitset(&tsk->real_blocked, 0);
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