#3037 new defect

QEMU fails to exit after test, 4 BSPS

Reported by: Cillian O'Donnell Owned by: joel.sherrill@…
Priority: normal Milestone: Indefinite
Component: bsps Version: 5
Severity: normal Keywords: qemu
Cc: Blocked By:
Blocking:

Description

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

LM32: lm32_evr

MIPS: malta

Change History (7)

comment:1 Changed on Jun 12, 2017 at 9:46:12 AM by Cillian O'Donnell

Component: testingbsps

comment:2 Changed on Jun 15, 2017 at 9:26:51 AM by Cillian O'Donnell

Milestone: Indefinite

comment:3 in reply to:  description ; Changed on Jun 23, 2017 at 9:32:25 AM by Cillian O'Donnell

Replying to Cillian O'Donnell:

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

This anomaly has disappeared with a slight change of Qemu options. i386 PC386 now behaves like the rest for both Qemu variants

LM32: lm32_evr

MIPS: malta

comment:4 in reply to:  3 ; Changed on Jun 25, 2017 at 11:47:36 PM by Chris Johns

Replying to Cillian O'Donnell:

Replying to Cillian O'Donnell:

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

The rtems-tester can be conditionally made to stop a simulator after a test if we finally decide the issue is in the simulator. We need to be careful not to kill the test if the problem is in the shutdown of the BSP due of a lack of a suitable shutdown, a bug or some issue in the tool set up.

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

This anomaly has disappeared with a slight change of Qemu options. i386 PC386 now behaves like the rest for both Qemu variants

What is the change to the options? It would be nice to document here what they are.

LM32: lm32_evr

MIPS: malta

comment:5 in reply to:  4 ; Changed on Jun 26, 2017 at 11:47:00 AM by Cillian O'Donnell

Replying to Chris Johns:

Replying to Cillian O'Donnell:

Replying to Cillian O'Donnell:

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

The rtems-tester can be conditionally made to stop a simulator after a test if we finally decide the issue is in the simulator. We need to be careful not to kill the test if the problem is in the shutdown of the BSP due of a lack of a suitable shutdown, a bug or some issue in the tool set up.

Ok, any tips on how to determine which of these problems I have?

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

This anomaly has disappeared with a slight change of Qemu options. i386 PC386 now behaves like the rest for both Qemu variants

What is the change to the options? It would be nice to document here what they are.

Yes I should've mentioned this. Using the following 3 sets of options, which are more in line with what had worked previously, the tests hangs before the output

qemu-system-i386 -m 128 -boot b -hda path_to/rtems-boot.img -no-reboot -monitor null -serial stdio -nographic -append "--console=com1;boot;" -kernel hello.exe

or

qemu-system-i386 -no-reboot -serial null -serial mon:stdio -nographic -kernel hello.exe
(in this case 'kill pid' must be issued)

or

qemu-system-i386 -no-reboot -monitor null -serial stdio -nographic -kernel hello.exe

and with a simpler set of options suggested by Sebastian it hangs after the output and behaves like the others as detailed above

qemu-system-i386 -monitor null -nographic -serial stdio -nodefaults -kernel hello.exe

LM32: lm32_evr

MIPS: malta

comment:6 in reply to:  5 ; Changed on Jun 26, 2017 at 11:38:09 PM by Chris Johns

Replying to Cillian O'Donnell:

Replying to Chris Johns:

Replying to Cillian O'Donnell:

Replying to Cillian O'Donnell:

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

The rtems-tester can be conditionally made to stop a simulator after a test if we finally decide the issue is in the simulator. We need to be careful not to kill the test if the problem is in the shutdown of the BSP due of a lack of a suitable shutdown, a bug or some issue in the tool set up.

Ok, any tips on how to determine which of these problems I have?

You need to examine each BSP:

  1. Does the BSP have suitable reset logic? This could be a hardware register that generate a power on reset (POR) or a power down, or a call to target resident ROM code that does this. It may mean looking into any technical reference detail about the specific target hardware looking for something that we could use, for example watch dogs.
  1. Does QEMU support the functionality to match the BSP? If not what does QEMU support and does the BSP support it? It may also pay to ask the qemu community to see if there is something we are missing.
  1. If QEMU and the BSP cannot be made to align so qemu exits please come back so we can discuss possible support in the tester to kill qemu. Killing qemu when a test passes is something we can support however what happens on failures is more difficult. Further timeouts are hard when running parallel qemu jobs because the load on the host changes the targets view of real-time vs the hosts view.

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

This anomaly has disappeared with a slight change of Qemu options. i386 PC386 now behaves like the rest for both Qemu variants

What is the change to the options? It would be nice to document here what they are.

Yes I should've mentioned this. Using the following 3 sets of options, which are more in line with what had worked previously, the tests hangs before the output

qemu-system-i386 -m 128 -boot b -hda path_to/rtems-boot.img -no-reboot -monitor null -serial stdio -nographic -append "--console=com1;boot;" -kernel hello.exe

or

qemu-system-i386 -no-reboot -serial null -serial mon:stdio -nographic -kernel hello.exe
(in this case 'kill pid' must be issued)

or

qemu-system-i386 -no-reboot -monitor null -serial stdio -nographic -kernel hello.exe

This aligns to the settings in the rtems-test tool:

https://git.rtems.org/rtems-tools/tree/tester/rtems/testing/qemu.cfg#n51

and with a simpler set of options suggested by Sebastian it hangs after the output and behaves like the others as detailed above

qemu-system-i386 -monitor null -nographic -serial stdio -nodefaults -kernel hello.exe

Just to be clear, what do you mean by "others"? Is this systems that hang or the systems that exit qemu to finish the test?

comment:7 in reply to:  6 Changed on Jun 27, 2017 at 9:04:15 AM by Cillian O'Donnell

Replying to Chris Johns:

Replying to Cillian O'Donnell:

Replying to Chris Johns:

Replying to Cillian O'Donnell:

Replying to Cillian O'Donnell:

Qemu tests time out as it fails to exit after test is run. Hello.exe hangs on the line 'end of test hello world' and requires manual exit (crtl+C)

The rtems-tester can be conditionally made to stop a simulator after a test if we finally decide the issue is in the simulator. We need to be careful not to kill the test if the problem is in the shutdown of the BSP due of a lack of a suitable shutdown, a bug or some issue in the tool set up.

Ok, any tips on how to determine which of these problems I have?

You need to examine each BSP:

  1. Does the BSP have suitable reset logic? This could be a hardware register that generate a power on reset (POR) or a power down, or a call to target resident ROM code that does this. It may mean looking into any technical reference detail about the specific target hardware looking for something that we could use, for example watch dogs.
  1. Does QEMU support the functionality to match the BSP? If not what does QEMU support and does the BSP support it? It may also pay to ask the qemu community to see if there is something we are missing.
  1. If QEMU and the BSP cannot be made to align so qemu exits please come back so we can discuss possible support in the tester to kill qemu. Killing qemu when a test passes is something we can support however what happens on failures is more difficult. Further timeouts are hard when running parallel qemu jobs because the load on the host changes the targets view of real-time vs the hosts view.

That's great, thanks Chris. I'll dig into this.

* BEGIN OF TEST HELLO WORLD *
Hello World
* END OF TEST HELLO WORLD *
qemu: terminating on signal 2

The BSPS affected are

ARM: lm3s6965_qemu

i386: PC386 (Current RSB-Qemu hangs before test output and Couverture-Qemu is as described)

This anomaly has disappeared with a slight change of Qemu options. i386 PC386 now behaves like the rest for both Qemu variants

What is the change to the options? It would be nice to document here what they are.

Yes I should've mentioned this. Using the following 3 sets of options, which are more in line with what had worked previously, the tests hangs before the output

qemu-system-i386 -m 128 -boot b -hda path_to/rtems-boot.img -no-reboot -monitor null -serial stdio -nographic -append "--console=com1;boot;" -kernel hello.exe

or

qemu-system-i386 -no-reboot -serial null -serial mon:stdio -nographic -kernel hello.exe
(in this case 'kill pid' must be issued)

or

qemu-system-i386 -no-reboot -monitor null -serial stdio -nographic -kernel hello.exe

This aligns to the settings in the rtems-test tool:

https://git.rtems.org/rtems-tools/tree/tester/rtems/testing/qemu.cfg#n51

and with a simpler set of options suggested by Sebastian it hangs after the output and behaves like the others as detailed above

qemu-system-i386 -monitor null -nographic -serial stdio -nodefaults -kernel hello.exe

Just to be clear, what do you mean by "others"? Is this systems that hang or the systems that exit qemu to finish the test?

The 'others' is referring to systems that hang. With that change in options all 4 bsps hang after 'hello world' output and require manual exit (ctrl+c) for both the current RSB-Qemu and Couverture-Qemu.

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