swamp serve -v crashed after ~3m17s with a fatal JavaScript heap out-of-memory while scheduled workflows were running. The process reached ~4 GB old-space and dumped core.

Environment

Swamp: 20260708.012813.0-sha.0f7166fe
OS: Linux laptop-tlaas-framework 7.0.11-200.fc44.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Jun 1 22:50:37 UTC 2026 x86_64 GNU/Linux
Repository: local-infra
Command: time swamp serve -v
Auth mode: default/none (warning emitted)

What happened

The server initialized, loaded the policy snapshot, registered 7 scheduled workflows, began firing scheduled runs at minute boundaries, then crashed with V8 heap exhaustion.

Relevant timeline:

12:09:05.047 warning serve auth-mode is none — deprecated
12:09:05.048 info serve Initializing repository at /var/home/evrardjp/git/evrardjp/local-infra
12:09:05.093 info swamp·domain·access·policy-snapshot Loaded policy snapshot: 0 active grant(s), 0 group(s)
12:09:34.764 info scheduled-execution Scheduled execution service started with 7 schedules
12:09:34.765 info serve WebSocket API server listening on ws://127.0.0.1:9090
12:10:00.002 info serve Running scheduled workflow REDACTED2
12:10:00.004 info serve Running scheduled workflow cluster-pool-sync
12:10:00.004 info serve Running scheduled workflow github-project-stale-classification-daily
12:10:00.094 info datastore·lock Acquiring lock for data/@evrardjp/REDACTED/c0f6776b-8c31-44c4-92cd-967180a2c6e1/.lock#91ef498d
12:10:59.112 info serve Scheduled workflow REDACTED2 completed (run: 214dbc92-6fd3-41ae-9a84-333bd7872c68)
12:10:59.414 info serve Scheduled workflow cluster-pool-sync completed (run: 6a3695ed-3b63-4070-99c2-62c6d6c8f0a6)
12:11:00.002 info serve Running scheduled workflow REDACTED2
12:11:00.003 info scheduled-execution Firing scheduled run for workflow REDACTED2

Immediately after the 12:11 scheduled run fired:

<--- Last few GCs --->

[245115:0x55cdc08c8000]   189054 ms: Mark-Compact (reduce) 4082.5 (4099.6) -> 4082.5 (4099.6) MB, pooled: 0.0 MB, 451.57 / 0.00 ms (average mu = 0.003, current mu = 0.000) last resort; GC in old space requested
[245115:0x55cdc08c8000]   189498 ms: Mark-Compact (reduce) 4082.5 (4099.6) -> 4082.5 (4099.6) MB, pooled: 0.0 MB, 443.31 / 0.00 ms (average mu = 0.002, current mu = 0.000) last resort; GC in old space requested

#
# Fatal JavaScript out of memory: Reached heap limit
#
==== C stack trace ===============================

    swamp(+0x23efc5e) [0x55cda6065c5e]
    swamp(+0x23eec7b) [0x55cda6064c7b]
    swamp(+0x23f0ec8) [0x55cda6066ec8]
    swamp(+0x249fb75) [0x55cda6115b75]
    swamp(+0x2656487) [0x55cda62cc487]
    swamp(+0x2655bb4) [0x55cda62cbbb4]
    swamp(+0x265537d) [0x55cda62cb37d]
    swamp(+0x2648d9b) [0x55cda62bed9b]
    swamp(+0x264873c) [0x55cda62be73c]
    swamp(+0x2626f6c) [0x55cda629cf6c]
    swamp(+0x261d471) [0x55cda6293471]
    swamp(+0x262aa60) [0x55cda62a0a60]
    swamp(+0x24b1654) [0x55cda6127654]
    swamp(+0x4f35115) [0x55cda8bab115]
    [0x7fb787dcfdda]
Trace/breakpoint trap      (core dumped) swamp serve -v

real    3m17.500s
user    2m7.959s
sys     0m24.187s

Expected behavior

swamp serve should remain running, or fail a single scheduled workflow gracefully, rather than growing to the V8 heap limit and crashing the server process.

Notes

The crash happened while scheduled execution was enabled and multiple workflows fired at the same minute boundary.
One workflow (REDACTED2) runs every minute and appears to have overlapped with/started again shortly after the previous scheduled work completed.
Several lock acquisition lines targeted the same redacted model data directory before the crash.

02Bog Flow

Shipped

7/8/2026, 3:47:56 PM

Click a lifecycle step above to view its details.

03Sludge Pulse

stack72 assigned stack727/8/2026, 3:09:05 PM

stack72 commented 7/8/2026, 3:48:04 PM

Thanks @evrardjp for reporting this! The fix has been merged and a release is on its way. We appreciate your contribution to swamp.

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