Description:
------------
When enabling the JIT in a production environment, I started getting various errors in third-party libraries (guzzlehttp/psr7, though I doubt it's relevant). After some poking and prodding, I was able to narrow it down to the JIT running in `tracing` mode (via "on" or explicitly "tracing"). Turning it back off or running it in "function" mode made the errors disappear.

Notably, if I'm following my logs correctly, the first job seems to run fine. It's only on the second+ job where the error comes up.

The errors that occurred included:

TypeError: GuzzleHttp\Psr7\Request::getBody(): Return value must be of type Psr\Http\Message\StreamInterface, null returned in /var/www/html/vendor/guzzlehttp/psr7/src/MessageTrait.php:127

Error: Cannot use object of type GuzzleHttp\Psr7\Uri as array in /var/www/html/vendor/guzzlehttp/psr7/src/MessageTrait.php:161

(see linked file below)

In both cases, the errors make absolutely no sense for the given source code, especially the latter. Which error I get seems basically random, though the latter seems more common for any given worker. My gut tells me the issue is somehow specific to traits, but I don't have any practical way to verify that.

INI settings:
opcache.enable="1"
opcache.enable_cli="1"
(typical opcache prod values, preloading is enabled)
opcache.jit="on"
opcache.jit_buffer_size="128M"

Test script:
---------------
https://github.com/Firehed/php-jit-tracing-error - this doesn't actually reproduce the issue (yet), but it shows the approximate code structure where it occurs.

The surrounding infrastructure/code in prod is fairly long and complex, so I'm not sure how much needs to get added in to reproduce the issue. But it's a run loop for an async job worker which performs a network request and then parses and stores the results in a database. Nothing too special. The code in question has been live for months without ever having an issue.

Errors originate in this file:

https://github.com/guzzle/psr7/blob/2.1.0/src/MessageTrait.php

Expected result:
----------------
No errors

Actual result:
--------------
One backtrace:

TypeError: GuzzleHttp\Psr7\Request::getBody(): Return value must be of type Psr\Http\Message\StreamInterface, null returned in /var/www/html/vendor/guzzlehttp/psr7/src/MessageTrait.php:127
Stack trace:
#0 /var/www/html/vendor/guzzlehttp/psr7/src/Utils.php(222): GuzzleHttp\Psr7\Request->getBody()
#1 /var/www/html/vendor/guzzlehttp/guzzle/src/Client.php(440): GuzzleHttp\Psr7\Utils::modifyRequest(Object(GuzzleHttp\Psr7\Request), Array)
#2 /var/www/html/vendor/guzzlehttp/guzzle/src/Client.php(326): GuzzleHttp\Client->applyOptions(Object(GuzzleHttp\Psr7\Request), Array)
#3 /var/www/html/vendor/guzzlehttp/guzzle/src/Client.php(107): GuzzleHttp\Client->transfer(Object(GuzzleHttp\Psr7\Request), Array)
#4 /var/www/html/vendor/guzzlehttp/guzzle/src/Client.php(123): GuzzleHttp\Client->sendAsync(Object(GuzzleHttp\Psr7\Request), Array)
#5 /var/www/html/src/Worker/FetchStoreData.php(241): GuzzleHttp\Client->send(Object(GuzzleHttp\Psr7\Request), Array)
#6 /var/www/html/src/Console/Worker/Run.php(213): Slant\Normalizer\Worker\FetchStoreData->doJob(Array)
#7 [internal function]: Slant\Normalizer\Console\Worker\Run->Slant\Normalizer\Console\Worker\{closure}(Object(Kicken\Gearman\Job\WorkerJob))
#8 /var/www/html/vendor/kicken/gearman-php/src/Worker.php(194): call_user_func(Object(Closure), Object(Kicken\Gearman\Job\WorkerJob))
#9 /var/www/html/vendor/kicken/gearman-php/src/Worker.php(177): Kicken\Gearman\Worker->processJob(Object(Kicken\Gearman\Protocol\Packet))
#10 /var/www/html/vendor/kicken/gearman-php/src/Worker.php(116): Kicken\Gearman\Worker->processPacket(Object(Kicken\Gearman\Protocol\Packet))
#11 /var/www/html/src/Console/Worker/Run.php(145): Kicken\Gearman\Worker->workOnce()
#12 /var/www/html/vendor/symfony/console/Command/Command.php(299): Slant\Normalizer\Console\Worker\Run->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#13 /var/www/html/vendor/symfony/console/Application.php(978): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /var/www/html/vendor/symfony/console/Application.php(295): Symfony\Component\Console\Application->doRunCommand(Object(Slant\Normalizer\Console\Worker\Run), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#15 /var/www/html/vendor/symfony/console/Application.php(167): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#16 /var/www/html/bin/app(63): Symfony\Component\Console\Application->run()
#17 {main}