** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
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https://bugs.launchpad.net/bugs/2029405
Title:
ftrace:test.d--event--subsystem-enable.tc fails with timeout on
focal:linux-hwe-5.15 ARM64
Status in ubuntu-kernel-tests:
In Progress
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
In Progress
Bug description:
First time seen this since ftrace refactor out from
ubuntu_kernel_selftests to ubuntu-kselftests-ftrace
Issue found on ARM64 nodes with both generic / generic-64k kernel.
Partial test log:
Running './ftracetest -vvv test.d/event/subsystem-enable.tc'
=== Ftrace unit tests ===
....
[1] event tracing - enable/disable with event level files
+ [ 2 -eq 1 ]
+ [ -f set_event_pid ]
+ echo
+ [ -f set_ftrace_pid ]
+ echo
+ [ -f set_ftrace_notrace ]
+ echo
+ [ -f set_graph_function ]
+ echo
+ tee set_graph_function set_graph_notrace
+ [ -f stack_trace_filter ]
+ echo
+ [ -f kprobe_events ]
+ echo
+ [ -f uprobe_events ]
+ echo
+ [ -f synthetic_events ]
+ echo
+ [ -f snapshot ]
+ echo 0
+ clear_trace
+ echo
+ enable_tracing
+ echo 1
+ .
/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_ftrace/src/linux/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
+ echo sched:sched_switch
+ yield
+ ping 127.0.0.1 -c 1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.096 ms
--- 127.0.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.096/0.096/0.096/0.000 ms
+ cat trace
+ grep sched_switch
+ wc -l
Timer expired (600 sec.), nuking pid 20982
From the code (tools/testing/selftests/ftrace/test.d/event/event-
enable.tc) this test is trying to run:
count=`cat trace | grep sched_switch | wc -l`
This command caused the timeout as `cat trace` seems to be never
ending.
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