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[1.29 Server] 0xC0000005 at DayZServer_x64+0x3C1D3D - null write during replication after entity deletion (2 dumps)

CrashServer
1

State

Assigned
Issue key
DZG-514
Access
Public
Space
DayZ
Project
Stable Feedback
Creator
how_leish
Created
Aug 28, 2026
Views
122
Platform
PC Steam
What happened?

Our dedicated server (Windows, Chernarus, community/modded) dies abruptly about once per day. The RPT truncates mid-line with no script error so a pure native crash.

Two minidumps from 2026-08-18 (20:45:43 and 22:05:38 local time) fault at the identical instruction: DayZServer_x64.exe+0x3C1D3D, exception 0xC0000005, WRITE at address 0x7 - a member-field write through a null/freed object pointer. Faulting instruction bytes: F0 44 0F C1 73 08 (lock xadd - an atomic refcount/counter update).

In both dumps the RPT shows the crash occurred during NETWORK: Replicate game state <player> roughly one second after an entity deletion - in one case an admin-tool deletion of a moving scripted entity, in the other a CE cleanup removal during infected despawn churn. A survey of 13 days of sessions shows our abrupt deaths overwhelmingly end mid mass-deletion activity (<cleanup> batches, dynamic-event despawn waves), while sessions ending normally never show deletion storms in their final output.

Suspected use-after-free: an entity deleted mid-frame while the replication layer still holds a reference.

Secondary, lower priority: two further dumps (2026-08-23 20:00:07, 2026-08-24 04:00:04, included) fault at DayZServer_x64.exe+0x618519, READ of heap addresses, during scheduled-restart shutdown/world unload - a teardown-path crash with no player impact.

Note on modding: the server runs many mods, but script VMEs cannot produce a native access violation inside the engine binary, and the identical faulting offset across independent crashes on different days points at one engine-side code path.

Reproduction steps

Not deterministically reproducible - frequency data instead:

  1. Windows dedicated server, 1.29.163709, ~30,000 CE loot entities, 20-40 players connected.

  2. An entity is deleted while actively replicating to nearby clients (observed triggers: admin-tool deletion of a moving scripted entity; CE cleanup batch during dynamic-event infected despawn).

  3. Within ~1 second the server may crash during "Replicate game state" with the signature above.

Rate: ~12 abrupt deaths over 13 days on our server; both fully-dumped crashes match the same offset. Happy to run diagnostic builds or supply further dumps.

Exact build version (optional)
1.29.163709
Where did it happen?
Community
Is it modded?
Yes
Expected result

Deleting an entity that is mid-replication should be safely guarded; the server should never write through a freed entity pointer. Server process should not terminate.

Section
Mod list

serverMod: Mutant/Zombie Spawn System; ExtraLogs

mod (load order): CF; Dabs Framework; DayZ Editor Loader; DayZ-Expansion-Core;

Forward Operator Gear; DayZ-Expansion-Market; DayZ-Expansion-Map-Assets;

DayZ-Expansion-Licensed; DayZ-Expansion; Breachingcharge; ZStuff;

Community-Online-Tools; DMTmainpack; DMTitems; DMTcars; DMTskins; gebsfish;

BaseBuildingPlus; Code Lock; OV_AllinOne; LIGHTS; MegaFoodPack; Crocos Quadbike;

IAT_Crafting_Plus; iLLMannered_Collectables; MoneyAUD; CannabisPlus; Dogtags;

TerrainIslands; BBPItemPack; GameLabs; LightObjects;

Land_R22R_Base_Fortifications_Assets; My Delta Force Medical; Automated Turrets;

MuchFramework; RedFalcon Trash; RedFalcon Watercraft; MZ KOTH;

RedFalcon Flight System Heliz; DrugsPLUS; AgricultureCore; BS HackedCrate;

BS KeyRoom; Custom Keycards; CJ187-SummerChernarus; BodyBags 2.0;

DayZ-Expansion-Quests

Load order / launch params

DayZServer_x64.exe -config serverDZ.cfg -port 2402 -profiles profiles -dologs -adminlog

-serverMod @3551827469;@3019531356

-mod @1559212036;@2545327648;@2276010135;@2291785308;@2931560672;@2572328470;@2792983824;@2116157322;@2116151222;@1827241477;@2384407442;@1564026768;@3655396182;@3655415194;@3655416547;@3655417006;@2757509117;@1710977250;@1646187754;@2316250469;@2822125184;@2789302074;@2757080411;@3142819902;@3430740067;@2569243811;@1932611410;@2303554682;@2393499239;@2794690371;@2464526692;@2981367410;@2961092390;@3441347183;@2851374375;@3171576913;@2887408858;@2906371600;@3348696867;@2692979668;@2170927235;@3690289718;@3482229348;@3514469093;@2810212624;@1644467354;@3707663156;@2828486817

(Steam Workshop IDs, in load order; names above map 1:1)

Reactions

Activity

    22 days ago
  • how_leish
    created issue22 days ago
  • 19 days ago
  • l909
    changed state to
    ASSIGNED
    19 days ago
  • 17 days ago
  • l909
    Moderator
    17 days ago
    l909
    Moderator
    17 days ago

    Hello.
    How often does this crash appear? Is it frequent or occurs randomly in small amounts?

  • how_leish
    17 days ago
    how_leish
    17 days ago

    Thanks for picking this up!

    It's the second category; random, in small amounts, not a constant or hourly crash. Over roughly the last two weeks it's on the order of one hard crash every one to three days that leaves a minidump, plus a few additional unexplained server terminations in the same period that may be the same fault without a usable dump. There's no correlation with player count (it has happened with a single player online and with 30+) or with time of day.

    The two dumps attached to this ticket are from 18 Aug, about 23 minutes apart, and both fault at the identical instruction (DayZServer_x64+0x3C1D3D, 0xC0000005, write to a low address) which is why I reported it as one specific code path rather than random memory corruption. In each case the RPT shows an entity being deleted during replication in the final moments before the fault, consistent with a use-after-free on a replicated entity.

    The server auto-restarts and recovers each time, so it's a stability annoyance rather than an outage. We've had at least one further crash of the same kind since filing (30 Aug) and I can attach that dump plus any RPTs you'd like? Just tell me which would be most useful.

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State

Assigned
Issue key
DZG-514
Access
Public
Space
DayZ
Project
Stable Feedback
Creator
how_leish
Created
Aug 28, 2026
Views
122