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A trading halt that exists only in a running process is not permanent. It lasts until that process ends. If the next startup clears the halt and takes a fresh equity snapshot, a trader who has already breached a loss limit can resume trading against a new baseline, and the limit then measures losses from a point that already sits below the original starting equity.
That failure pattern is described in a write-up by Valerii Sakara about a prop-firm trading utility. According to the write-up, the flaw was found by reading the tool’s public source code rather than by running the tool. The sections below explain the mechanism, show how the baseline moves, and set out a restart-testing procedure that would expose the problem.
What the write-up describes
The utility enforced two limits: a daily loss limit and a maximum drawdown limit. When either was breached, it halted trading. According to the write-up, the breach state and the day-start equity snapshot were held only in running memory. Nothing was written to disk, and nothing was reloaded when the process started.
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Startup then performed two actions unconditionally. It reset a shared halt flag to “not halted,” and it took a new snapshot of account equity. Together, those actions undo the halt and move the reference point to wherever equity stands after the losses.
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The failure sequence
The problem is not the breach check itself, which worked during an uninterrupted session. It is what happens across the boundary between two sessions:
- A loss breaches the daily limit, and the utility sets the halt flag in memory.
- The process ends. The flag, the breach record and the day-start snapshot disappear with it.
- The process starts again. Startup code runs before anything reads saved state, because no saved state exists.
- Startup sets the halt flag to “not halted,” which is the clean default.
- Startup takes a fresh equity snapshot. That lower equity becomes the new day-start value.
- Every later check measures losses from the new snapshot, not from the start of the day.
How the baseline moves: a worked example
The figures below are illustrative. They are not taken from the write-up. Assume a $100,000 account with a 5 percent daily loss limit measured from day-start equity.
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- Day-start equity is $100,000, so the limit allows a loss of $5,000 and the halt triggers at $95,000.
- The utility halts at $95,000. The process then restarts.
- Startup takes a new snapshot at $95,000. The same 5 percent limit now allows a further $4,750 loss, so the next halt triggers at $90,250.
- Total loss from the original start of the day is $9,750, nearly double the $5,000 the rule was meant to permit.
A restart therefore does more than reopen trading. It changes what the limit is measuring, and each restart can move the reference point lower.
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Where safety state can live
A halt needs a storage location that outlives the process, and the location determines what survives. The table compares the options the write-up discusses. Cells marked “not stated” are points the write-up does not establish.
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| Storage option | Survives process end | Retention | Scope | Restored before defaults are set | Halt cleared only by explicit action |
|---|---|---|---|---|---|
| Process memory (the reported utility’s approach) | No, per the write-up | Lasts only as long as the process | Per running process | Not applicable; startup reset the flag | Not applicable; startup cleared it |
| Terminal global variables | Considered by the author; survival across restart not stated | The write-up says they could be deleted after about four weeks without access. This is the author’s claim and has not been independently confirmed for any terminal version. | Not stated | Not stated | Not stated |
| One saved file per account (the write-up’s eventual fix) | Yes, per the write-up | Not stated | Per account | Restored at startup; the order relative to default initialization is not detailed | Yes, through a setting that clears a saved halt when a new challenge begins |
What a correct restore looks like
The write-up’s fix follows a pattern that can be applied to any tool with a loss limit:
- Save the breach state and the day-start equity snapshot together, keyed to the account they belong to.
- On startup, load the saved state before any default value is written.
- Treat a restored halt as active until an explicit action clears it.
- Provide a deliberate clearing action, separate from normal startup, for the case where a new challenge or trading period legitimately begins.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.“A durable-looking place to store state is not the same as a durable one; where it lives matters as much as whether it’s saved.” (Valerii Sakara, article author)
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How to test restart behavior
A test that triggers the breach in one uninterrupted session does not exercise restoration. Run the following sequence on a demo account or a simulated environment where possible, and record the halt status and the displayed day-start equity at each step.
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- Trigger a breach. Cause a daily-loss or drawdown breach. Expected result: trading stops and no new orders are sent.
- Restart the process. Expected result: the halt is still active, and the day-start equity matches the pre-breach value, not the post-loss equity.
- Detach and reattach. Remove the component from the chart or session and attach it again. Expected result: the same as step 2.
- Redeploy. Deploy the component to a fresh instance or host. Expected result: the halt and baseline persist. If they do not, the saved state is tied to the old machine’s local storage.
- Reboot the machine. Expected result: the same as step 2.
- Check startup order. Read the startup path and confirm that state is loaded before any reset or snapshot runs.
- Check retention. Leave the saved state untouched for longer than the storage location’s retention window, then confirm the halt still applies. For terminal global variables, the write-up’s four-week figure is the threshold to test against.
- Check scope. Trigger a halt on one account and confirm that other accounts are unaffected, and that clearing one account’s halt does not clear another’s.
What the evidence does and does not establish
- The write-up is the only source for these claims. Its author reports reading public source code; the write-up does not describe running the tool, and this article does not add independent testing.
- The product and its version are not named in the material available here, so the findings cannot be matched to a specific release.
- The four-week retention behavior for terminal global variables is the author’s claim and is not confirmed for any terminal version.
- Readers should check the original write-up and the current code of their own tool to confirm whether the restore-before-reset behavior is present and whether a fix has shipped in the version they run.
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