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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_arm/accel_TCG/1147.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 1147
-title = "x86_64 emu on aarch64 host: cpu_exec: assertion failed: (cpu == current_cpu)"
-state = "closed"
-created_at = "2022-08-07T20:06:19.889Z"
-closed_at = "2023-01-17T15:47:24.283Z"
-labels = ["Closed::Fixed", "accel: TCG", "host: arm"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1147"
-host-os = "Asahi Linux"
-host-arch = "aarch64"
-qemu-version = "7.0.0"
-guest-os = "Ubuntu 22.04 LTS"
-guest-arch = "x86_64"
-description = """Execution of some binaries crashes with `Bail out! ERROR:../qemu-7.0.0/accel/tcg/cpu-exec.c:933:cpu_exec: assertion failed: (cpu == current_cpu)`. Looking at the code, that code is wrapped in a gcc/clang ifdef. Recompiling with clang produces this crash instead: `... include/qemu/rcu.h:102: void rcu_read_unlock(void): Assertion 'p_rcu_reader->depth != 0' failed.`
-
-No easier steps to reproduce (yet) than `systemd-nspawn`ing into an x86_64 Ubuntu container invoking qemu-x86_64-static through binfmt. Commands such as `ls` work fine, while `apt-get` will immediately crash with the error listed above.
-
-Note that this happens running Asahi Linux on the bare metal of an M1-based Macbook Pro. This same issue does *not* occur running the *same* binaries with the *same* x86_64 Ubuntu image on an Arch or Ubuntu VM under macOS on the same machine - regardless of if the QEMU binaries were built in a VM or in Asahi.
-
-These are big.LITTLE chips. Using taskset/affinity to limit the target process to a single specific core does not help. The Asahi kernel has a 16K page-size, which is known to cause trouble for some programs. qemu-arm(-static) however works without any issues (the M1 cannot run 32-bit ARM code natively, only 64-bit)."""
-reproduce = "n/a"
-additional = "n/a"