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-id = 2971
-title = "loongarch64 crashes caused by lenient instruction decoding of vldi and xvldi"
-state = "opened"
-created_at = "2025-05-18T20:08:15.081Z"
-closed_at = "n/a"
-labels = []
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2971"
-host-os = "Linux Mint 22 Cinnamon"
-host-arch = "x86"
-qemu-version = "qemu-loongarch64 version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.6)"
-guest-os = "n/a"
-guest-arch = "loongarch64 (default one)"
-description = """Lenient instruction decoding of `vldi` and `xvldi` leads to Qemu crashes.
-
-The decoding of `vldi` and `xvldi` instruction allows for instructions with illegal immediates.
-
-`target/loongarch/insns.decode`:
-
-```
-vldi             0111 00111110 00 ............. .....     @v_i13
-xvldi            0111 01111110 00 ............. .....     @v_i13
-```
-
-This is considered in `target/loongarch/tcg/insn_trans/trans_vec.c.inc`:
-
-```C
-    /*
-     * imm bit [11:8] is mode, mode value is 0-12.
-     * other values are invalid.
-     */
-```
-
-However, an assertion error is raised when this condition is violated and qemu crashes:
-
-```
-**
-ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached
-Bail out! ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached
-```
-
-On hardware (Loongson 3A5000), these instructions cause a SIGILL."""
-reproduce = """1. compile the `test_inv_vldi` test program for loongarch64 (see additional information)
-2. run `qemu-loongarch64-static ./test_inv_vldi`"""
-additional = """I will post a patch for this issue to the mailing list soon.
-
-`test_inv_vldi` source code:
-
-```C
-int main(int argc, char** argv) {
-    asm volatile(".4byte 0x73e3a000");    
-}
-```"""