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Errored: OpenSmalltalk/opensmalltalk-vm#1814 (Cog - 352de13)

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Errored: OpenSmalltalk/opensmalltalk-vm#1814 (Cog - 352de13)

OpenSmalltalk

opensmalltalk-vm

branch icon Cog

Build #1814 has errored

11 mins and 44 secs

Eliot Miranda

352de13 CHANGESET →

Ensure that sigaltstack is used to establish an alternative signal stack on
Unix platforms, and that the SIGIO handler (forceInterruptCheck) runs on that
stack. Although we don't have absolute proof we have strong evidence to suggest
that on recent macOS versions (e.g. 10.13) the first delivery of SIGIO to the
VM causes corruption of the code zone if the VM is in or transitioning to
machine code. This is similar to crashes seen in the Newspeak VM on linux using
the ITIMER heartbeat. There-on the issue was that the dynamic linker would be
called within the signal handler on first invocation, and that this would cause
the dynamic linker to traverse the Smalltalk JIT code stack, misinteerpret
Smalltalk stack frames as ABI-compliant stack frames and cause corruption as
a result.

Since the code is now system wide on Unix, not merely confined to the ITIMER VM,
move the sigaltstack initialization to platforms/unix/vm/aio.c and delete the
duplications in the ITIMER heartbeat variants.

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Eliot Miranda-2

Re: Errored: OpenSmalltalk/opensmalltalk-vm#1814 (Cog - 352de13)

Hi All,

can a linux expert take a look at the failing Travis CI build?

The following packages have unmet dependencies:
231 libpango1.0-dev:i386 : Depends: libcairo2-dev:i386 (>= 1.12.10) but it is not going to be installed
232E: Unable to correct problems, you have held broken packages.
233The command "./scripts/ci/travis_install.sh" failed and exited with 100 during .

On Sat, Oct 5, 2019 at 8:00 PM Travis CI <[hidden email]> wrote:

OpenSmalltalk

/

opensmalltalk-vm

Cog

Build #1814 has errored

11 mins and 44 secs

Eliot Miranda

352de13 CHANGESET →

Ensure that sigaltstack is used to establish an alternative signal stack on
Unix platforms, and that the SIGIO handler (forceInterruptCheck) runs on that
stack. Although we don't have absolute proof we have strong evidence to suggest
that on recent macOS versions (e.g. 10.13) the first delivery of SIGIO to the
VM causes corruption of the code zone if the VM is in or transitioning to
machine code. This is similar to crashes seen in the Newspeak VM on linux using
the ITIMER heartbeat. There-on the issue was that the dynamic linker would be
called within the signal handler on first invocation, and that this would cause
the dynamic linker to traverse the Smalltalk JIT code stack, misinteerpret
Smalltalk stack frames as ABI-compliant stack frames and cause corruption as
a result.

Since the code is now system wide on Unix, not merely confined to the ITIMER VM,
move the sigaltstack initialization to platforms/unix/vm/aio.c and delete the
duplications in the ITIMER heartbeat variants.

Want to know about upcoming build environment updates?

Would you like to stay up-to-date with the upcoming Travis CI build environment updates? We set up a mailing list for you!
SIGN UP HERE

Documentation about Travis CI

Have any questions? [hidden email]

Unsubscribe from build emails from the OpenSmalltalk/opensmalltalk-vm repository.

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_,,,^..^,,,_

best, Eliot