Bug 6464

Summary: lttng view: flooding Alignment trap: babeltrace
Product: [Runtime] General Runtime Reporter: Robert Berger <pokylinux>
Component: General RuntimeAssignee: Saul Wold <sgw>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: Medium    
Version: 1.6   
Target Milestone: 1.7.1   
Hardware: Other   
OS: arm   
Whiteboard:
OS type for building Yocto: --- Type of Regression: ---
Verified: Documentation change: Don't know

Description Robert Berger 2014-06-18 13:19:39 UTC 
# cat /proc/version 
Linux version 3.14.4-yocto-standard (genius@8fa4efeb5e9d) (gcc version 4.8.2 (GCC) ) #1 Tue Jun 3 18:57:32 UTC 2014

# cat /etc/issue
Poky (Yocto Project Reference Distro) 1.6 \n \l

# cat /proc/cpuinfo 
processor       : 0
model name      : ARM926EJ-S rev 5 (v5l)
Features        : swp half fastmult edsp java 
CPU implementer : 0x41
CPU architecture: 5TEJ
CPU variant     : 0x0
CPU part        : 0x926
CPU revision    : 5

Hardware        : Freescale MXS (Device Tree)
Revision        : 0000
Serial          : 0000000000000000

lttng tracer module not found [1]

(host) fix:
bitbake lttng-modules

(target) install:
opkg install kernel-module-lttng*

so far so good.

lttng list -k

I followed [2]

lttng create
lttng enable-event --kernel --all
lttng start
lttng stop
lttng view

and now the party begins, since I'm flooded with many:
[15319.153974] Alignment trap: babeltrace (1613) PC=0x45438530 Instr=0xe5910024 Address=0xb6ebf7cb FSR 0x001
[15319.164985] Alignment trap: babeltrace (1613) PC=0x45438534 Instr=0xe583c000 Address=0xb6ebf753 FSR 0x801
[15319.179299] Alignment trap: babeltrace (1613) PC=0x45438538 Instr=0xe592200c Address=0x00c5b47b FSR 0x001
[15319.190483] Alignment trap: babeltrace (1613) PC=0x4543853c Instr=0xe5802000 Address=0xb6ebf7c7 FSR 0x801
[15319.201545] Alignment trap: babeltrace (1613) PC=0x45438544 Instr=0xe5813024 Address=0xb6ebf7cb FSR 0x801
[15319.213017] Alignment trap: babeltrace (1613) PC=0x45437a50 Instr=0xe5903018 Address=0xb6ebf7bf FSR 0x001
[15319.224121] Alignment trap: babeltrace (1613) PC=0x45437e58 Instr=0xe5b3000c Address=0xb6ebf7b3 FSR 0x001
[15319.235141] Alignment trap: babeltrace (1613) PC=0x45437e70 Instr=0xe5803004 Address=0xb6ebf7af FSR 0x801
[15319.246357] Alignment trap: babeltrace (1613) PC=0x45437e74 Instr=0xe5923010 Address=0xb6ebf7b7 FSR 0x001

[1] https://bugzilla.yoctoproject.org/show_bug.cgi?id=6015
[2] http://www.yoctoproject.org/docs/1.6/profile-manual/profile-manual.html#collecting-and-viewing-traces
Comment 1 Robert Berger 2014-06-18 13:22:58 UTC 
see also: 

http://bugs.lttng.org/issues/789
Comment 2 Saul Wold 2014-11-11 21:48:33 UTC 
babeltrace is pending update in 1.8, I working on a backport of the patch 
mentioned
Comment 3 Saul Wold 2014-12-02 03:24:56 UTC 
Fixed in Dizzy
https://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?h=dizzy&id=9e8bb322154e67e521e8c982d20d46dda20c024b

Master patched queued for 1.8 package upgrade

Do we need at 1.6.3 backport or will 1.7.1 do?