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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/650.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 650
-title = "Monitor device_add triggers deadlock when calling drain_call_rcu on QEMU >= 6.0.0"
-state = "closed"
-created_at = "2021-09-30T12:31:08.233Z"
-closed_at = "2022-01-25T09:06:57.879Z"
-labels = ["Regression", "Stable::to backport", "kind::Bug"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/650"
-host-os = "Debian bullseye/sid"
-host-arch = "amd64"
-qemu-version = "6.1.50 (v6.1.0-936-gba0fa56bc0)"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """It hangs"""
-reproduce = """1. Run the QEMU:
-   ```
-   ./qemu-system-mips64 -nographic
-   ```
-2. Enter into the QEMU monitor: press ctrl-a c
-3. Execute command `device_add` without arguments:
-```
-(qemu) device_add
-```
-4. It hangs so bad that only `kill -9` helps"""
-additional = """I didn't test versions between 4.2.0 and 6.0.0, but I can confirm that 6.0.0, 6.1.0 and the latest master pull have this bug, while version 4.2.0 doesn't have it.
-
-I've tracked the problem and found this.
-
-1. Command `device_add` calls function `drain_call_rcu`. `drain_call_rcu` waits indefinitely for drain_complete_event.
-2. Function `cpu_exec` in accel/tcg/cpu-exec.c calls `rcu_read_lock` but does not call `rcu_read_unlock()`. `cpu_exec` just spins in its inner loop.
-3. Function `call_rcu_thread` hanged in calling the `synchronize_rcu` which calls `wait_for_readers`.
-
-If I execute `stop` command in QEMU monitor before calling `device_add` command, no hang happen."""