Re: patch-2.6.15-rc7-rt2 (realtime-preempt) report

From: Florian Schmidt
Date: Mon Jan 02 2006 - 18:14:42 EST

On Mon, 2 Jan 2006 22:45:16 +0100
Ingo Molnar <mingo@xxxxxxx> wrote:

> could you try -rt3?

-rt3 gives me this BUG, when running rosegarden (btw: i forgot to
mention, that i use debian unstable and thus gcc 4.0.3):

==========================================
[ BUG: lock recursion deadlock detected! |
------------------------------------------
already locked: [c0331b20] {rtc_task_lock}
.. held by: IRQ 8: 18 [efd1ce90, 1]
... acquired at: rtc_interrupt+0x79/0x130
-{current task's backtrace}----------------->
[<c0130cf7>] check_deadlock+0x307/0x340 (8)
[<c02377d9>] rtc_interrupt+0x79/0x130 (8)
[<c02d9b52>] __schedule+0x392/0x710 (4)
[<c0238854>] rtc_control+0x24/0x80 (16)
[<c0131ae1>] task_blocks_on_lock+0x41/0x130 (12)
[<c0238854>] rtc_control+0x24/0x80 (16)
[<c02db2a8>] __down_mutex+0x498/0x910 (24)
[<c0238854>] rtc_control+0x24/0x80 (16)
[<c0238854>] rtc_control+0x24/0x80 (80)
[<c0142370>] do_irqd+0x0/0xa0 (8)
[<c02dd9c3>] _spin_lock_irq+0x23/0x50 (4)
[<c0238854>] rtc_control+0x24/0x80 (8)
[<c0238854>] rtc_control+0x24/0x80 (16)
[<f09f70f9>] rtctimer_stop+0x29/0x60 [snd_rtctimer] (16)
[<f081e20e>] snd_timer_interrupt+0x2ae/0x2f0 [snd_timer] (16)
[<c0142370>] do_irqd+0x0/0xa0 (56)
[<f09f7147>] rtctimer_interrupt+0x17/0x20 [snd_rtctimer] (4)
[<c02377ec>] rtc_interrupt+0x8c/0x130 (12)
[<c0141126>] handle_IRQ_event+0x76/0xf0 (20)
[<c0142370>] do_irqd+0x0/0xa0 (44)
[<c0142215>] thread_edge_irq+0x85/0x130 (4)
[<c01422f7>] do_hardirq+0x37/0xb0 (32)
[<c01423d7>] do_irqd+0x67/0xa0 (16)
[<c012c3d6>] kthread+0xb6/0xc0 (28)
[<c012c320>] kthread+0x0/0xc0 (24)
[<c0100ded>] kernel_thread_helper+0x5/0x18 (16)
---------------------------
| preempt count: 00000002 ]
| 2-level deep critical section nesting:
----------------------------------------
.. [<c013948a>] .... add_preempt_count+0x1a/0x20
.....[<00000000>] .. ( <= _stext+0x3feffde0/0x60)
.. [<c013948a>] .... add_preempt_count+0x1a/0x20
.....[<00000000>] .. ( <= _stext+0x3feffde0/0x60)


showing all tasks:
S init: 1 [c16fb500, 116] (not blocked)
S softirq-high/0: 2 [c16fae10, 0] (not blocked)
S softirq-timer/0: 3 [c16fa720, 0] (not blocked)
S softirq-net-tx/: 4 [c16fa030, 98] (not blocked)
S softirq-net-rx/: 5 [c1709520, 98] (not blocked)
S softirq-scsi/0: 6 [c1708e30, 98] (not blocked)
S softirq-tasklet: 7 [c1708740, 98] (not blocked)
S watchdog/0: 8 [c1708050, 0] (not blocked)
S desched/0: 9 [c1715540, 105] (not blocked)
S events/0: 10 [c1714e50, 0] (not blocked)
S khelper: 11 [c1714760, 110] (not blocked)
S kthread: 12 [c1714070, 111] (not blocked)
S kblockd/0: 13 [efcf9560, 110] (not blocked)
S pdflush: 14 [efcf8e70, 125] (not blocked)
S pdflush: 15 [efcf8780, 115] (not blocked)
S aio/0: 17 [efd1d580, 120] (not blocked)
S kswapd0: 16 [efcf8090, 125] (not blocked)
S IRQ 8: 18 [efd1ce90, 1] (not blocked)
S kseriod: 19 [efd1c7a0, 110] (not blocked)
S IRQ 12: 20 [efd1c0b0, 51] (not blocked)
S IRQ 14: 21 [efe235a0, 44] (not blocked)
S IRQ 15: 22 [efe22eb0, 44] (not blocked)
S IRQ 1: 23 [efe227c0, 0] (not blocked)
S kjournald: 24 [efe220d0, 115] (not blocked)
S kgameportd: 186 [ef062800, 111] (not blocked)
S IRQ 4: 189 [ee8e9600, 17] (not blocked)
S khubd: 209 [ef062110, 110] (not blocked)
S IRQ 5: 210 [ef65c0f0, 56] (not blocked)
S IRQ 10: 211 [ee8e8f10, 89] (not blocked)
S kjournald: 284 [ef062ef0, 115] (not blocked)
S kjournald: 287 [ef201620, 119] (not blocked)
S kjournald: 288 [ef65c7e0, 120] (not blocked)
S kjournald: 289 [ef200f30, 119] (not blocked)
S kjournald: 290 [ef200840, 119] (not blocked)
S portmap: 413 [ee8e8130, 116] (not blocked)
S syslogd: 531 [ef65ced0, 116] (not blocked)
S klogd: 537 [edc69640, 116] (not blocked)
S pppd: 547 [ee8e8820, 116] (not blocked)
S pppoe: 551 [edc68f50, 116] (not blocked)
S IRQ 3: 557 [edc68170, 58] (not blocked)
S automount: 649 [edc68860, 116] (not blocked)
S dbus-daemon-1: 655 [ed8ccf90, 115] (not blocked)
S hald: 660 [ed9856a0, 116] (not blocked)
S exim4: 733 [ed8b6880, 121] (not blocked)
S gpm: 741 [ed8b6f70, 115] (not blocked)
S sshd: 753 [ef200150, 118] (not blocked)
S xfs: 762 [ed984fb0, 116] (not blocked)
S cron: 798 [ed8cc1b0, 116] (not blocked)
S rt_watchdog: 854 [ef0635e0, 1] (not blocked)
S rt_watchdog: 855 [ed9848c0, 98] (not blocked)
S gdm: 864 [ed8cc8a0, 115] (not blocked)
R gdm: 865 [ed8cd680, 115] (not blocked)
S Xorg: 874 [eca096c0, 115] (not blocked)
S getty: 886 [ed8b7660, 117] (not blocked)
S getty: 887 [ed8b6190, 117] (not blocked)
S getty: 888 [eca08fd0, 117] (not blocked)
S getty: 889 [ef65d5c0, 117] (not blocked)
S getty: 890 [ed9841d0, 117] (not blocked)
S getty: 891 [eca088e0, 117] (not blocked)
S sh: 924 [ebfacff0, 122] (not blocked)
S ssh-agent: 994 [ebfad6e0, 116] (not blocked)
S ssh-agent: 995 [ebae7700, 116] (not blocked)
S sh: 999 [ebfac210, 121] (not blocked)
S xfce4-session: 1004 [eca081f0, 116] (not blocked)
S xscreensaver: 1002 [ebfac900, 115] (not blocked)
S xfce-mcs-manage: 1009 [ebae6920, 115] (not blocked)
S xfwm4: 1012 [ebae6230, 115] (not blocked)
S xftaskbar4: 1014 [e8a1b720, 116] (not blocked)
S xfdesktop: 1016 [e8a1b030, 115] (not blocked)
S xfce4-panel: 1019 [e8a1a940, 115] (not blocked)
S gkrellm: 1022 [e8a1a250, 115] (not blocked)
S evolution: 1024 [e7fe1740, 116] (not blocked)
S evolution: 1077 [e3fa49c0, 115] (not blocked)
S sylpheed-claws: 1026 [e7fe1050, 115] (not blocked)
S qjackctl: 1028 [e7fe0960, 115] (not blocked)
S gaim: 1030 [e7fe0270, 116] (not blocked)
R xmms: 1032 [e7a0b760, 115] (not blocked)
S xmms: 1039 [e7a0b070, 115] (not blocked)
S xmms: 1060 [ebae7010, 115] (not blocked)
S gconfd-2: 1043 [e7a0a980, 116] (not blocked)
S bonobo-activati: 1058 [e3d809a0, 115] (not blocked)
S evolution-data-: 1065 [e3d81780, 115] (not blocked)
S evolution-data-: 1071 [e3fa50b0, 115] (not blocked)
S evolution-data-: 1104 [e18c5800, 116] (not blocked)
S evolution-alarm: 1089 [e3fa57a0, 116] (not blocked)
S evolution-alarm: 1091 [e23502f0, 117] (not blocked)
S evolution-alarm: 1108 [e3fa42d0, 118] (not blocked)
S xterm: 1116 [e18cf7e0, 116] (not blocked)
S bash: 1117 [e18c4a20, 117] (not blocked)
S xterm: 1489 [e18c5110, 116] (not blocked)
S bash: 1490 [e23510d0, 115] (not blocked)
S xterm: 1520 [e23509e0, 116] (not blocked)
S bash: 1521 [e18cea00, 116] (not blocked)
S htop: 1614 [e18ce310, 117] (not blocked)
R rosegarden4: 1635 [e3d81090, 116] (not blocked)
S kdeinit: 1637 [e23517c0, 116] (not blocked)
R dcopserver: 1641 [e18c4330, 116] (not blocked)
S klauncher: 1643 [dd98b130, 115] (not blocked)
S kded: 1645 [e18cf0f0, 115] (not blocked)
R rosegardenseque: 1651 [dd98b820, 115] (not blocked)
S jackd: 1653 [e3d802b0, 119] (not blocked)
S jackd: 1656 [dd98aa40, 119] (not blocked)
S jackd: 1657 [e7a0a290, 120] (not blocked)
S jackd: 1658 [dd98a350, 19] (not blocked)
S jackd: 1659 [d7381840, 29] (not blocked)

=============================================

[ turning off deadlock detection. Please report this trace. ]

The bootup swapper BUG also persists:

BUG: swapper:0 task might have lost a preemption check!
[<c0100b3b>] cpu_idle+0x6b/0xb0 (8)
[<c010026b>] _stext+0x4b/0x60 (4)
[<c0364831>] start_kernel+0x191/0x210 (16)
[<c0364350>] unknown_bootoption+0x0/0x200 (20)
---------------------------
| preempt count: 00000000 ]
| 0-level deep critical section nesting:
----------------------------------------

------------------------------
| showing all locks held by: | (swapper/0 [c0319d20, 140]):
------------------------------

.config identical to -rt2

Flo

--
Palimm Palimm!
http://tapas.affenbande.org
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