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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/31006] systemtap.contex/context.exp test causes reboot
 on RHEL8 ppc64le
Date: Mon, 30 Oct 2023 00:37:21 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31006

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
Looking at the /sys/kernel/debug/tracing/trace I see why now it didn' trigg=
er
the problem as the probe was put on yyy_int+0x4 rather than yyy_int+0x0 as
systemtap is doing:

echo 'p:myprobe systemtap_test_module2:yyy_int $comm' >
/sys/kernel/debug/tracing/kprobe_events
echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
echo  1 > /proc/stap_test_cmd=20
echo  1 > /proc/stap_test_cmd

# cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
#                              _-----=3D> irqs-off
#                             / _----=3D> need-resched
#                            | / _---=3D> hardirq/softirq
#                            || / _--=3D> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
            bash-1976  [006] ....  1525.064248: myprobe: (yyy_int+0x4/0x20
[systemtap_test_module2]) arg1=3D"bash"
            bash-1976  [006] ....  1617.000845: myprobe: (yyy_int+0x4/0x20
[systemtap_test_module2]) arg1=3D"bash"

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