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Opened 2 years ago

#21721 new defect

Trunk: kernel tracing: trace-cmd causes segmentation fault

Reported by: DerMc Owned by: developers
Priority: normal Milestone:
Component: packages Version: Trunk
Keywords: Cc:

Description

I made a build of trunk this morning with kernel tracing enabled. I ssh to the router and try to run trace-cmd:

root@OWRT:/mnt/usb# trace-cmd record -e mac80211
/sys/kernel/tracing/events/mac80211/filter
/sys/kernel/tracing/events/*/mac80211/filter
Segmentation fault
root@OWRT:/mnt/usb#

Syslog shows:
Wed Jan 27 10:57:48 2016 kern.info kernel: [ 993.563810]
Wed Jan 27 10:57:48 2016 kern.info kernel: [ 993.563810] do_page_fault(): sending SIGSEGV to trace-cmd for invalid read access from 00000000
Wed Jan 27 10:57:48 2016 kern.info kernel: [ 993.573115] epc = 777419e0 in libc.so[776cc000+90000]
Wed Jan 27 10:57:48 2016 kern.info kernel: [ 993.578501] ra = 00406f38 in trace-cmd[400000+37000]
Wed Jan 27 10:57:48 2016 kern.info kernel: [ 993.583697]

Any ideas how to get ftrace or trace-cmd working??

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