diff --git a/MobileGL/Config.h b/MobileGL/Config.h
index 93d3b941..130ddceb 100644
--- a/MobileGL/Config.h
+++ b/MobileGL/Config.h
@@ -516,13 +516,17 @@ namespace MobileGL::MG_Config {
         // MOBILEGL_IPC_EVENT_WAIT_MS (PH-6, ID-P7-2): the SERVER's patience, in ms, for ONE
         // reverse-channel event that finds SEG_EVENT full under run-ahead. The apply thread
         // publishes, rings the client and parks until the client drains enough room; a client
-        // that has not made room when this runs out - it stopped draining, it drains a slot at
-        // a time, or it went away - FORFEITS the reverse channel: that event and every later
-        // one is dropped and counted (eventDropped), and the session stops by the ordinary
-        // stop path rather than by Fatal{EventRingOverflow}. It bounds the whole reservation,
-        // not one park, so a trickling peer cannot stretch it. Was a 30000 ms constant spent
-        // twice. Read by the server only (ServerSpawn.cpp passes it to a spawned child); the
-        // lockstep arm (no kCapRunAheadApply, i.e. Magma) never waits and keeps P5C's Fatal.
+        // that has not made room when this runs out - it stopped draining (NotDraining) or it
+        // drains a slot at a time (TooSlow) - FORFEITS the reverse channel: that event and every
+        // later one is dropped and counted (eventDropped), and the session stops by the ordinary
+        // stop path rather than by Fatal{EventRingOverflow}. A peer that goes away (PeerGone) or
+        // a session that is stopped (Stopped) ends the wait at once instead, so the knob may
+        // exceed ServerLoop::Stop()'s 5000 ms join. It bounds the whole reservation, not one
+        // park, so a trickling peer cannot stretch it - nor can a shm peer that writes the
+        // (peer-writable) eventRingFull latch to 0 itself, though that one keeps the apply
+        // thread spinning rather than parked until the budget runs out. Was a 30000 ms constant
+        // spent twice. Read by the server only (ServerSpawn.cpp passes it to a spawned child);
+        // the lockstep arm (no kCapRunAheadApply, i.e. Magma) never waits and keeps P5C's Fatal.
         Uint32 EventWaitMs = 2000;
         // MOBILEGL_IPC_PERSISTENT_BLOCK_KB: block granularity of the persistent-map push.
         // 0 IS A NEGATIVE CONTROL, NOT "unlimited": it disables the push, and
diff --git a/MobileGL/MG_Remote/CONTRACT-P7.md b/MobileGL/MG_Remote/CONTRACT-P7.md
index b5dac5a4..2e627b28 100644
--- a/MobileGL/MG_Remote/CONTRACT-P7.md
+++ b/MobileGL/MG_Remote/CONTRACT-P7.md
@@ -185,3 +185,4 @@ verify **在 wave 3 之前**只在 monolith 臂注册（`MG_IntegrationTest/CMak
   - 采样器 14：`SamplerObject::Get{BorderColor,BorderColorI,BorderColorUI,CompareMode,MagFilter,MaxAnisotropy,MaxLod,MinFilter,MinLod,MipmapMode,SamplerCompareFunc,WrapR,WrapS,WrapT}`（`VkSamplerManager` 的 `<SamplerObject>` 实例化；5 个另由 `UniformManager::ProgramSamplesOnlySingleLevelTextures`）。
   - 对象读 6：`FramebufferAttachmentObject::{GetSize,IsComplete,IsValid}`、`RenderbufferObject::IsAllocated`、`VertexArrayObject::GetIndexBufferBindingSlot`、`BufferObject::EnsureGpuResidentStorage`（monolith render pass / clear / blit / 回读 / 索引 / SSBO 与 XFB）。
   - `MGB_CTX` 访问 4：`PipeInputs::{GetTextureObject,HasOpenTransformFeedbackSpan,InvalidateCompileEnv}`、`GLImpl::CopyTextureImageToClientOrPBO_State`。
+- **PH-6 / fuzz 臂 3 的记录债（包 f2-event，ID-P7-2；细节 `~/w7/logs/f2-event/NOTE.md` §5）**：(1) **被丢事件所属的那条记录照常完成**：它仍贴 `kStatusOk` 回复并推进 `appliedSeq`（`ServerLoop.cpp` `DrainRing` 在该记录之后才停），而 `Client/` 里没有任何代码读 `eventDropped`（`EventRingConsumer::DroppedEvents()` 只有测试在读）——一个先发不等的 readback、事后才等其回复的 client，可能在看到 EOF 之前读到缺那次 writeback 的影子。只有不等待的 client 走得到（等待中的 client 在等待里就排空了）。修法候选是让触发 forfeit 的记录回复失败，或 client 在 `eventDropped != 0` 时闩 device-lost；两者都动 client 的等待 / 回复契约，未做。(2) **inproc 不被告知**：forfeit 停掉 apply 线程，同进程的 client 收不到任何信号。这不是「只有测试能到达」（初版 NOTE 的说法不对）：(3) 的场景在 inproc 上同样可达，之后 client 的下一次等待在 120 s 后以 `Fatal{BarrierTimeout}` 死——诊断名字是错的，真因是 forfeit（审查指出，本包未测）。(3) **默认 2000 ms 未在设备上测过**：合法 client 停调 GL 超过旋钮（如 Android 退后台）且队里有一环以上未等待的事件（XFB writeback）会丢会话；此前是 30 s 后 Fatal。(4) **lockstep 臂不变**：无 `kCapRunAheadApply` 的 server（Magma）满环仍是 P5C 的 `Fatal{EventRingOverflow}`，不排空的对端让会话 SIGABRT（计入 `sessionsFaulted`，下一连接照常服务）；fuzz 臂 3 没有 Magma 臂。(5) **对端不被告知原因**：没有 forfeit 的 wire 词，client 只见 EOF → device-lost；加 `Refuse` / `Fatal` 码会改 `wireFingerprint`。(6) **shm 的 `eventRingFull` 在对端可写的页上**：持续写 0 的对端让保留循环不 park 地自旋，直到旋钮耗尽后以 `TooSlow` forfeit 或会话被 Stop（有界，只记）。(7) **stream 面的阻塞 `sendmsg`**（`StreamLink.cpp:158`，apply 线程经 `StreamLink::Flush` 同步 `SendEvents`）**不是无界的**：数据套接字带 `TCP_USER_TIMEOUT=5000`（`SocketTransport.cpp:99-112`）。实测（临时探针，未入库）：对端 SIGSTOP、旋钮 8000，stream 面 5327 ms 时链路被内核判死 → `ReverseChannelForfeit{PeerGone}`、exit 0；shm 面等满 8006 ms → `NotDraining`、exit 0。即 stream 面上一个冻住（活着但不 ACK）的对端约 5 s 被叫作 PeerGone，与旋钮无关；apply 线程恰好卡在 send 里时控制流又结束，`Stop()` 的 5000 ms join 与这 5 s 赛跑——未构造出，记录。(8) forfeit 后队列里剩下的记录不再应用（有意）；`RunSession` 每会话每 250 ms 轮询一次控制套接字，且每一轮都查 apply 线程（记录，不是门）。(9) 排在 PH-6 等待后面的 surface op：server 的控制线程阻塞在 apply 线程的邮箱里（P5e 的等待谓词不含控制请求，本包未改），对端活着但只是不排空时，这个 op 要等旋钮耗尽才被回答；对端死亡则由数据 bell 报告（shm 面靠 server bell 挂在控制套接字上的死亡见证，镜像 CONTRACT-P6 D5c）。(10) **server bell 的死亡见证改变了 shm 会话的正常收尾顺序**：client 的 `ShutdownSend`（`ClientSession::Stop` 第 2 步）现在可能先让 apply 线程从 park 里以 dead bell 退出、再由控制循环读到 EOF；两条路走同一个退出块，每次 shm 会话正常收尾 server 日志多一行 INFO `the peer hung up (witness fd …, revents=0x2000)`（其措辞是为 client 侧写的）。
diff --git a/MobileGL/MG_Remote/Server/ServerSession.cpp b/MobileGL/MG_Remote/Server/ServerSession.cpp
index 77c343f1..a1f000e0 100644
--- a/MobileGL/MG_Remote/Server/ServerSession.cpp
+++ b/MobileGL/MG_Remote/Server/ServerSession.cpp
@@ -284,8 +284,9 @@ namespace MobileGL::MG_Remote::Server {
                 SessionFail(MGFatalFamily::EventRingOverflow, "MGPipe: Fatal{EventRingOverflow} - %s needs %llu bytes and SEG_EVENT "
                         "caps ONE record at %llu (half its capacity). Flow control cannot help: "
                         "no amount of draining makes a record fit a ring that is too small for "
-                        "it. Raise MOBILEGL_IPC_EVENT_KB or slice the event at its producer, as "
-                        "the writeback path already does",
+                        "it. SEG_EVENT's size is fixed (SessionSegmentSizes::EventRingBytes; the "
+                        "MOBILEGL_IPC_EVENT_KB knob P5e proposed was never built), so slice the "
+                        "event at its producer, as the writeback path already does",
                         eventName, static_cast<unsigned long long>(payloadBytes),
                         static_cast<unsigned long long>(cap));
             }
diff --git a/docs/Disaggregated/ARCHITECTURE.md b/docs/Disaggregated/ARCHITECTURE.md
index 95968296..64937e44 100644
--- a/docs/Disaggregated/ARCHITECTURE.md
+++ b/docs/Disaggregated/ARCHITECTURE.md
@@ -653,7 +653,7 @@ CMake：
 | `MOBILEGL_IPC_RING_MB` | 8 | `SEG_CMD`；单条记录至多一半 |
 | `MOBILEGL_IPC_STAGE_MB` | 32 | `SEG_STAGE`；目标负载 profile 显式 256 |
 | `MOBILEGL_IPC_SPIN_US` | 50 | park 前自旋；P5d 三轮起自旋按一次性校准的迭代预算走、稳态不读时钟，`0` = 不自旋直接 park |
-| `MOBILEGL_IPC_EVENT_WAIT_MS` | 2000（1–600000） | PH-6（ID-P7-2），只由 server 读（`ServerSpawn.cpp` 放行给 spawn 子进程）：run-ahead 下一条反向事件遇到满的 `SEG_EVENT` 时，server 等 client 腾出空间的**整笔预算**（不是每次 park 的）。到期、client 只涓流不腾够、或 client 的 bell 已死（先判死，不误报为超时）→ `ReverseChannelForfeit{NotDraining\|TooSlow\|PeerGone}`：该事件及其后全部计数丢弃（`eventDropped`），apply 循环按正常 Stop 退出，会话 exit 0，supervisor 照常欢迎下一连接。取代原先 30000 ms × 两轮后的 `Fatal{EventRingOverflow}`。lockstep 臂（无 `kCapRunAheadApply`，即 Magma）不等待，仍是 P5C 的 Fatal |
+| `MOBILEGL_IPC_EVENT_WAIT_MS` | 2000（1–600000） | PH-6（ID-P7-2），只由 server 读（`ServerSpawn.cpp` 放行给 spawn 子进程）：run-ahead 下一条反向事件遇到满的 `SEG_EVENT` 时，server 等 client 腾出空间的**整笔预算**（不是每次 park 的）。到期（client 不排空 / 只涓流不腾够）→ `ReverseChannelForfeit{NotDraining\|TooSlow}`；client 已走（bell 已死——shm 上靠 server bell 挂在控制套接字上的死亡见证——或控制流 EOF）→ `{PeerGone}`、会话被 Stop（如控制流收到畸形帧）→ `{Stopped}`，这两种立即结束等待，所以旋钮可以大于 `ServerLoop::Stop()` 的 5000 ms join。之后该事件及其后全部计数丢弃（`eventDropped`），apply 循环按正常 Stop 退出，控制循环每一轮都查 apply 线程是否还在，会话 exit 0，supervisor 照常欢迎下一连接。取代原先 30000 ms × 两轮后的 `Fatal{EventRingOverflow}`。lockstep 臂（无 `kCapRunAheadApply`，即 Magma）不等待，仍是 P5C 的 Fatal |
 | `MOBILEGL_IPC_PERSISTENT_BLOCK_KB` | 64 | persistent-map 推送块粒度；`0` 是 E3(a) 阴性对照 |
 | `MOBILEGL_IPC_PERSISTENT_HASH_SUPPRESS` | 1 | 推送只发内容变了的块（追踪 buffer 走 mprotect 位图，未追踪走内容哈希）；`0` 恢复全范围推送（A/B 对照） |
 | `MOBILEGL_IPC_BATCH_WAITS` | 1 | 值类记录（无 reply slot 的 kCtxState/kCtxCso/kCtxObject）发布即返回，barrier 推迟到下一个拉取类 verb；**`generate_mipmap` 例外**（它的 apply 读 `MGB_CTX->GetActiveTextureUnit()`，规则：只有 apply 不读残余填充字段的记录才可免等）；`0` 恢复 R-1 逐条 barrier（`MOBILEGL_PIPE_VERIFY` 强制 0） |