Stack dump on ipipe 4.9.135-7 x86_64

Mauro Salvini mauro.salvini at smigroup.net
Thu Dec 20 09:28:34 CET 2018


Hi all,

I'm testing Xenomai 3 on an Intel Braswell board (Atom x5-E8000).
I'm using ipipe kernel at last commit from [1], branch ipipe-4.9.y,
64bit build on a Debian Stretch 9.6 64bit.
Xenomai library is from [2], branch stable/v3.0.x on commit bc53d03f (I
haven't two last commits but seems not related). I tried both 32bit
(mixed ABI) and 64bit builds with same following result.

I launch:

xeno-test -l "dohell -s xxx -p yyy -m xxx 90000" -T 90000

After a variable time (from minutes to hours) from latency test start I
get a few overruns that I discovered are generated by a kernel stack
dump (attached to mail the dmesg tail). Latency test doesn't stop, and
after this stackdump never reports other overruns or latency peaks
(seems I need to reboot to reproduce stack).

I read in this mailing list that on last patches much work has done on
FPU part, should it be related?

Glad to give other infos if you need.

Thanks in advance, regards.

Mauro

[1] https://gitlab.denx.de/Xenomai/ipipe
[2] https://gitlab.denx.de/Xenomai/xenomai
-------------- next part --------------
[  233.205940] /home/build-user/develop/linux-ipipe-4.9.y/arch/x86/xenomai/include/asm/xenomai/fptest.h:43: Warning: Linux is compiled to use FPU in kernel-space.
               For this reason, switchtest can not test using FPU in Linux kernel-space.
[  295.660454] ------------[ cut here ]------------
[  295.660461] WARNING: CPU: 0 PID: 139 at /home/build-user/develop/linux-ipipe-4.9.y/arch/x86/include/asm/fpu/internal.h:502 xnarch_leave_root+0x1a4/0x1b0
[  295.660465] Modules linked in: binfmt_misc msr iTCO_wdt iTCO_vendor_support coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw snd_pcm gf128mul glue_helper i915 ablk_helper snd_timer cryptd snd soundcore pcspkr drm_kms_helper drm evdev lpc_ich mfd_core fb_sys_fops syscopyarea sysfillrect sysimgblt sg shpchp video button ip_tables x_tables autofs4 ext4 crc16 jbd2 fscrypto mbcache sd_mod hid_generic usbhid hid crc32c_intel ahci igb i2c_i801 libahci i2c_smbus i2c_algo_bit xhci_pci dca ptp pps_core libata xhci_hcd sdhci_pci sdhci usbcore scsi_mod mmc_core fjes [last unloaded: rtnet]
[  295.660660] CPU: 0 PID: 139 Comm: jbd2/sda1-8 Tainted: G        W       4.9.135+ #1
[  295.660663] Hardware name: Default string Default string/Q7-BW, BIOS V1.20#KW050220A 03/16/2018
[  295.660666] I-pipe domain: Xenomai
[  295.660668]  0000000000000000 ffffffff823402c2 0000000000000000 0000000000000000
[  295.660680]  ffffffff829cd400 ffffffff8206cb68 ffff985636908040 ffff985636504080
[  295.660706]  0000000000099f50 0000000000000000 ffffbc1580563040 ffff98567ac9b940
[  295.660718] Call Trace:
[  295.660721]  [<ffffffff823402c2>] ? dump_stack+0xb5/0xd3
[  295.660724]  [<ffffffff8206cb68>] ? __warn+0xc8/0xf0
[  295.660727]  [<ffffffff82068734>] ? xnarch_leave_root+0x1a4/0x1b0
[  295.660729]  [<ffffffff82173b56>] ? ___xnsched_run+0x3f6/0x4b0
[  295.660732]  [<ffffffff8219fbf6>] ? timerfd_handler+0x36/0x50
[  295.660735]  [<ffffffff8217b075>] ? xntimerq_insert+0x5/0xa0
[  295.660738]  [<ffffffff8216a7c9>] ? xnclock_tick+0x1a9/0x2c0
[  295.660740]  [<ffffffff8216cd8a>] ? xnintr_core_clock_handler+0x2fa/0x310
[  295.660743]  [<ffffffff82119b1a>] ? dispatch_irq_head+0x8a/0x120
[  295.660746]  [<ffffffff8203ad75>] ? __ipipe_handle_irq+0x85/0x1b0
[  295.660749]  [<ffffffff82605ba9>] ? apic_timer_interrupt+0x89/0xb0
[  295.660752]  [<ffffffffc01502a6>] ? continue_block+0x22/0x54 [crc32c_intel]
[  295.660754]  [<ffffffffc0150233>] ? crc32c_pcl_intel_update+0x53/0x60 [crc32c_intel]
[  295.660757]  [<ffffffffc031fa90>] ? jbd2_journal_commit_transaction+0x9e0/0x1850 [jbd2]
[  295.660760]  [<ffffffff82603d60>] ? __switch_to_asm+0x40/0x70
[  295.660763]  [<ffffffff820d19af>] ? try_to_del_timer_sync+0x4f/0x80
[  295.660766]  [<ffffffffc0324c92>] ? kjournald2+0xe2/0x290 [jbd2]
[  295.660768]  [<ffffffff820b0320>] ? wake_up_atomic_t+0x30/0x30
[  295.660771]  [<ffffffffc0324bb0>] ? commit_timeout+0x10/0x10 [jbd2]
[  295.660774]  [<ffffffff8208df65>] ? kthread+0xf5/0x110
[  295.660776]  [<ffffffff82603d60>] ? __switch_to_asm+0x40/0x70
[  295.660779]  [<ffffffff8208de70>] ? kthread_park+0x60/0x60
[  295.660782]  [<ffffffff82603de5>] ? ret_from_fork+0x55/0x60
[  295.660785] ---[ end trace b1bfa97fc17a203c ]---
[  705.768058] perf: interrupt took too long (2543 > 2500), lowering kernel.perf_event_max_sample_rate to 78500
[  865.772646] perf: interrupt took too long (3207 > 3178), lowering kernel.perf_event_max_sample_rate to 62250


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