hpet driver backtraces when hyperthreading enabled

[Mike Pastore]

Binary package hint: linux-image-2.6.31-14-generic

Ubuntu 9.10 Desktop AMD64

The following appears in dmesg when Hyperthreading is enabled in the BIOS:

[ 1.859689] ------------[ cut here ]------------
[ 1.859695] WARNING: at /build/buildd/linux-2.6.31/arch/x86/kernel/hpet.c:390 hpet_next_event+0x75/0x90()
[ 1.859697] Hardware name:
[ 1.859698] Modules linked in:
[ 1.859700] Pid: 0, comm: swapper Not tainted 2.6.31-14-generic #48-Ubuntu
[ 1.859701] Call Trace:
[ 1.859706] [<ffffffff8105e788>] warn_slowpath_common+0x78/0xb0
[ 1.859708] [<ffffffff8105e7cf>] warn_slowpath_null+0xf/0x20
[ 1.859710] [<ffffffff81034335>] hpet_next_event+0x75/0x90
[ 1.859712] [<ffffffff8103437b>] hpet_legacy_next_event+0xb/0x10
[ 1.859715] [<ffffffff810856df>] clockevents_program_event+0x4f/0x90
[ 1.859718] [<ffffffff81086bd0>] tick_dev_program_event+0x40/0xd0
[ 1.859720] [<ffffffff81086566>] tick_broadcast_oneshot_control+0x116/0x120
[ 1.859723] [<ffffffff81085e50>] tick_notify+0x130/0x1a0
[ 1.859725] [<ffffffff8152c197>] notifier_call_chain+0x47/0x90
[ 1.859728] [<ffffffff8107d841>] raw_notifier_call_chain+0x11/0x20
[ 1.859730] [<ffffffff810854e4>] clockevents_notify+0x34/0xa0
[ 1.859733] [<ffffffff812d7876>] lapic_timer_state_broadcast+0x41/0x43
[ 1.859735] [<ffffffff812d7dd3>] acpi_idle_enter_bm+0x185/0x2bf
[ 1.859737] [<ffffffff812d7c40>] ? acpi_idle_enter_c1+0xae/0xbc
[ 1.859739] [<ffffffff813fe40b>] cpuidle_idle_call+0x9b/0xf0
[ 1.859742] [<ffffffff81010e12>] cpu_idle+0xb2/0x100
[ 1.859745] [<ffffffff815239f6>] start_secondary+0xa9/0xab
[ 1.859748] ---[ end trace 24e97c3b18305fae ]---

It does not appear when Hyperthreading is disabled in the BIOS.

I have a strong suspicion that this bug will only appear on Core i7-8xx chips. This is the Nehalem/Lynnfield chip, Socket LGA-1156, with the new P55 Express chipset. There are currently two models: the 860 (2.8 GHz) and the 870 (2.93 GHz). There is a third chip for this socket, the Core i5-750 (2.66 GHz), but it does not support Hyperthreading, so it would not be affected.

[Mike Pastore (mwpastore)]

lspci is the same with ht disabled

[Yucong Sun (sunyucong)]

happened to me as well, both 2.6.28 & 2.6.31

cpu is an single quad core with HT X3450

[ 2.158796] ------------[ cut here ]------------
[ 2.158808] WARNING: at /build/buildd/linux-2.6.31/arch/x86/kernel/hpet.c:390 hpet_next_event+0x75/0x90()
[ 2.158817] Hardware name: PowerEdge T310
[ 2.158821] Modules linked in:
[ 2.158829] Pid: 0, comm: swapper Not tainted 2.6.31-14-server #48-Ubuntu
[ 2.158837] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 2.158842] EDD information not available.
[ 2.158848] Call Trace:
[ 2.158858] [<ffffffff8105e618>] warn_slowpath_common+0x78/0xb0
[ 2.158865] [<ffffffff8105e65f>] warn_slowpath_null+0xf/0x20
[ 2.158871] [<ffffffff81034335>] hpet_next_event+0x75/0x90
[ 2.158877] [<ffffffff8103437b>] hpet_legacy_next_event+0xb/0x10
[ 2.158885] [<ffffffff810851df>] clockevents_program_event+0x4f/0x90
[ 2.158893] [<ffffffff810866d0>] tick_dev_program_event+0x40/0xd0
[ 2.158900] [<ffffffff81086066>] tick_broadcast_oneshot_control+0x116/0x120
[ 2.158907] [<ffffffff81085950>] tick_notify+0x130/0x1a0
[ 2.158916] [<ffffffff81529887>] notifier_call_chain+0x47/0x90
[ 2.158923] [<ffffffff8107d331>] raw_notifier_call_chain+0x11/0x20
[ 2.158929] [<ffffffff81084fe4>] clockevents_notify+0x34/0xa0
[ 2.158937] [<ffffffff812d5b6a>] lapic_timer_state_broadcast+0x41/0x43
[ 2.158943] [<ffffffff812d60c7>] acpi_idle_enter_bm+0x185/0x2bf
[ 2.158949] [<ffffffff812d5f34>] ? acpi_idle_enter_c1+0xae/0xbc
[ 2.158958] [<ffffffff813fc13b>] cpuidle_idle_call+0x9b/0xf0
[ 2.158966] [<ffffffff81010e02>] cpu_idle+0xb2/0x100
[ 2.158972] [<ffffffff81521166>] start_secondary+0xa9/0xab
[ 2.158977] ---[ end trace decc02a3eb18b513 ]---

[Vadim Zeitlin (vz-ubuntu)]

Also happens with i860 on Gigabyte GA-P55-UD5 motherboard.

This problem is discussed in this LKML thread: http://thread.gmane.org/gmane.linux.kernel/913374/

[Lukas Koranda (lkoranda)]

Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz on P55 chipset

Lucid Beta2 2.6.32-19-generic x86_64