| Ticket UUID: | e55a589d2bd744cfc176b0bce12696b11c6ca1cb | ||
| Title: | async send + busy thread + TCL_FINALIZE_ON_EXIT=1 == segmentation fault | ||
| Type: | Bug | Created on: | 2025-05-01 10:58:26 |
| Submitter: | pooryorick | Assigned to: | apnadkarni |
| Subsystem: | 80. Thread Package | Severity: | Minor |
| Priority: | 5 Medium | Last modified: | 2026-05-23 15:18:18 |
| Status: | Closed | Closed by: | apnadkarni |
| Resolution: | Fixed | Closed on: | 2026-05-23 15:18:18 |
| Version: | |||
| Description: | ||||
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When evaluated under a recent build of trunk, with the environment variable TCL_FINALIZE_ON_EXIT=1, the following script produces a segmentation fault:
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| User Comments: | ||||
apnadkarni added on 2026-05-21 15:59:17:
Still present in core-9-0-branch as of today. Verified on Windows and Linux. Examining further ... apnadkarni added on 2026-05-22 08:17:43:
Proposed fix in [bug-e55a589d2b](https://core.tcl-lang.org/tcl/timeline?r=bug-e55a589d2b). Not sure it is a complete fix, and may leak memory but I don't think a complete fix between non-cooperating threads is possible in Tcl. In any case, since this is at exit time so should suffice as a fix to at least not crash. apnadkarni added on 2026-05-23 15:18:18:
Fixed in [fc30388d62]. Not backported to 9.0 as a corner case and not worth risking without a full beta cycle. | ||||