Re: [Xenomai] RTDM-native brushup

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2015-06-19 15:27, Michael Haberler wrote:
> 
>> Am 19.06.2015 um 14:14 schrieb Jan Kiszka <jan.kiszka@siemens.com>:
>>
> ..
> 
>> Serial logs preferred (the top of the error message is missing)...
> 
> (wild guess: spinlocks around here: https://github.com/mhaberler/rtdm-native/blob/6e13d330b69608cc6480a21cf0a2458aeeae86b9/ksrc/skins/rtdm/native/drvlib.c#L215-L260)
> 
> a systemd configuration safari later - serial console output:
> 
> root@j1900:/home/mah/rtdm-native/examples/rtdm-native# ./rtdmtest -s -c 10
> 
> console:
> 
>> j1900 login: [  595.174003] starting RTDM services.
>> [  600.472950] __rtdmtest_init: registering device rttest0, err=250
>> [  678.281348] rtdmtest_close state=0x4
>> [  697.224846] ------------[ cut here ]------------
>> [  697.224850] kernel BUG at kernel/locking/rtmutex.c:996!

This line of code should tell you what is disliked. Probably that
interrupts are off (spin_lock_irqsave).

>> [  697.224855] invalid opcode: 0000 [#1] PREEMPT SMP
>> [  697.224919] Modules linked in: rtdmtest(O) rtdm(O) rpcsec_gss_krb5 nfsv4 binfmt_misc cfg80211 rfkill hid_generic nfsd iTCO_wdt iTCO_vendor_support auth_rpcgss oid_registry nfs_acl evdev nfs ppdev lockd grace fscache sunrpc usbhid hid coretemp kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_realtek psmouse serio_raw snd_hda_codec_generic pcspkr snd_hda_intel snd_hda_controller snd_hda_codec lpc_ich i2c_i801 snd_hwdep mfd_core snd_pcm snd_timer snd shpchp soundcore battery parport_pc parport i915 video drm_kms_helper acpi_cpufreq drm i2c_algo_bit button i2c_core processor loop fuse autofs4 ext4 crc16 jbd2 mbcache microcode sg sd_mod xhci_pci xhci_hcd crc32c_intel ahci libahci libata r8169 usbcore fan thermal mii usb_common scsi_mod thermal_sys
>> [  697.224925] CPU: 2 PID: 1495 Comm: rtdmtest Tainted: G           O   3.18.13-rt10mah+ #1
>> [  697.224927] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./J1900N-D3V, BIOS F3 04/29/2014
>> [  697.224931] task: f18a8660 ti: f18f2000 task.ti: f18f2000
>> [  697.224934] EIP: 0060:[<c13270c3>] EFLAGS: 00010246 CPU: 2
>> [  697.224942] EIP is at rt_spin_lock_slowlock+0x54/0x190
>> [  697.224944] EAX: f18a8660 EBX: f353fec0 ECX: 00000000 EDX: f18a8660
>> [  697.224947] ESI: f18a8660 EDI: 00000001 EBP: f18f3e28 ESP: f18f3e1c
>> [  697.224949]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
>> [  697.224952] CR0: 8005003b CR2: 08156be0 CR3: 3089d000 CR4: 001007d0
>> [  697.224953] Stack:
>> [  697.224960]  c1049433 f4cbb960 00000002 f18f3e28 00000046 c153ece4 f18f3e34 00000691
>> [  697.224966]  f18a8660 00000000 c153e8e0 00000001 c1030d9b f353fec0 f18f3e78 f353feb8
>> [  697.224972]  f18a8660 c1055bb3 f353feb4 f353fec0 f86b9834 00000691 00000000 00000001
>> [  697.224973] Call Trace:
>> [  697.224980]  [<c1049433>] ? ttwu_do_wakeup+0x36/0xf7
>> [  697.224986]  [<c1030d9b>] ? pin_current_cpu+0x1c/0x12b
>> [  697.224992]  [<c1055bb3>] ? add_wait_queue_exclusive+0x15/0x37
>> [  697.225000]  [<f86b9834>] ? _rtdm_sem_down+0x57/0x122 [rtdm]
>> [  697.225005]  [<c104bd2f>] ? wake_up_state+0x7/0x7
>> [  697.225011]  [<f86fb5ec>] ? rtdmtest_ioctl+0x318/0x4fd [rtdmtest]
>> [  697.225018]  [<c1022ab0>] ? smp_apic_timer_interrupt+0x22/0x2b
>> [  697.225023]  [<c1328979>] ? apic_timer_interrupt+0x2d/0x34
>> [  697.225030]  [<f86b9c48>] ? _rtdm_chrdev_ioctl+0x23/0x3e [rtdm]
>> [  697.225035]  [<f86b9c25>] ? rtdm_context_get+0x3/0x3 [rtdm]
>> [  697.225041]  [<c10fde26>] ? do_vfs_ioctl+0x384/0x440
>> [  697.225045]  [<c104af4a>] ? _sched_setscheduler+0x6a/0x71
>> [  697.225050]  [<c1104a52>] ? __fget+0x4c/0x52
>> [  697.225054]  [<c10fdf26>] ? SyS_ioctl+0x44/0x66
>> [  697.225059]  [<c13280f0>] ? sysenter_do_call+0x12/0x12
>> [  697.225100] Code: 8b 35 74 d6 53 c1 e8 2d 0a 00 00 31 c9 89 f2 6a 01 89 d8 e8 60 24 d3 ff 5f 85 c0 0f 85 37 01 00 00 8b 43 0c 83 e0 fe 39 c6 75 02 <0f> 0b 8d be dc 04 00 00 89 f8 e8 13 0a 00 00 8b 06 89 46 04 64
>> [  697.225106] EIP: [<c13270c3>] rt_spin_lock_slowlock+0x54/0x190 SS:ESP 0068:f18f3e1c

You probably want to enable frame pointers in order to make the
backtraces more reliable.

Jan

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