1 files changed, 58 insertions, 0 deletions

diff --git a/gitlab/issues/target_missing/host_missing/accel_missing/2686.toml b/gitlab/issues/target_missing/host_missing/accel_missing/2686.toml
new file mode 100644
index 000000000..a71ed31fe
--- /dev/null
+++ b/gitlab/issues/target_missing/host_missing/accel_missing/2686.toml
@@ -0,0 +1,58 @@
+id = 2686
+title = "rng-seed addition causing test_loongarch64_virt.py to hang in EFI startup"
+state = "closed"
+created_at = "2024-11-18T19:53:27.441Z"
+closed_at = "2024-12-03T18:00:27.975Z"
+labels = ["kind::Bug", "workflow::Patch available"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2686"
+host-os = "Fedora 41"
+host-arch = "x86_64"
+qemu-version = "git d9bd1ccbf1d84d872aed684c65fec33814b8ac1b"
+guest-os = "n/a"
+guest-arch = "n/a"
+description = """Since the rng-seed addition, the test_loongarch64_virt.py test will periodically hang.
+
+git bisect blames this
+
+```
+commit d9bd1ccbf1d84d872aed684c65fec33814b8ac1b
+Author: Jason A. Donenfeld <Jason@zx2c4.com>
+Date:   Thu Sep 5 17:33:16 2024 +0200
+
+    hw/loongarch: virt: pass random seed to fdt
+    
+    If the FDT contains /chosen/rng-seed, then the Linux RNG will use it to
+    initialize early. Set this using the usual guest random number
+    generation function.
+    
+    This is the same procedure that's done in b91b6b5a2c ("hw/microblaze:
+    pass random seed to fdt"), e4b4f0b71c ("hw/riscv: virt: pass random seed
+    to fdt"), c6fe3e6b4c ("hw/openrisc: virt: pass random seed to fdt"),
+    67f7e426e5 ("hw/i386: pass RNG seed via setup_data entry"), c287941a4d
+    ("hw/rx: pass random seed to fdt"), 5e19cc68fb ("hw/mips: boston: pass
+    random seed to fdt"), 6b23a67916 ("hw/nios2: virt: pass random seed to fdt")
+    c4b075318e ("hw/ppc: pass random seed to fdt"), and 5242876f37
+    ("hw/arm/virt: dt: add rng-seed property").
+    
+    These earlier commits later were amended to rerandomize the RNG seed on
+    snapshot load, but the LoongArch code somehow already does that, despite
+    not having this patch here, presumably due to some lucky copy and
+    pasting.
+    
+    Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+    Reviewed-by: Song Gao <gaosong@loongson.cn>
+    Message-Id: <20240905153316.2038769-1-Jason@zx2c4.com>
+    Signed-off-by: Song Gao <gaosong@loongson.cn>
+```
+
+When it hangs, test_loongarch64_virt.py will get stuck waiting for serial console output from the guest.
+
+Looking at the console.log file shows it to be completely empty. 
+
+This appears to indicate it has hung before EDK has even initialized, as it has not even printed the 'Entering C environment' message"""
+reproduce = """1. ./configure --target-list=loongarch64-softmmu
+2. make -j 20
+3. n=0 ; while true ; do n=$(expr $n + 1); echo $n ; QEMU_TEST_QEMU_BINARY=./build/qemu-system-loongarch64  PYTHONPATH=./python ./tests/functional/test_loongarch64_virt.py  ; done
+
+Most commonly it will hang within 10 iterations, very occasionally needing upto 25"""
+additional = "n/a"