1 files changed, 60 insertions, 0 deletions
diff --git a/results/classifier/118/none/2895 b/results/classifier/118/none/2895
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--- /dev/null
+++ b/results/classifier/118/none/2895
@@ -0,0 +1,60 @@
+graphic: 0.729
+kernel: 0.717
+arm: 0.672
+performance: 0.646
+debug: 0.521
+peripherals: 0.478
+device: 0.435
+architecture: 0.419
+files: 0.274
+semantic: 0.240
+vnc: 0.199
+PID: 0.187
+socket: 0.158
+boot: 0.157
+network: 0.135
+user-level: 0.126
+hypervisor: 0.123
+x86: 0.123
+register: 0.115
+ppc: 0.111
+mistranslation: 0.108
+virtual: 0.094
+i386: 0.083
+permissions: 0.064
+VMM: 0.052
+risc-v: 0.049
+TCG: 0.044
+assembly: 0.041
+KVM: 0.023
+
+qemu-system-aarch64: Error: r = HV_BAD_ARGUMENT (0xfae94003, at ../target/arm/hvf/hvf.c:2259)
+Description of problem:
+When I launch a Linux guest in QEMU with `-accel hvf` + `-gdb "tcp::1234"`, and I try to debug the kernel with `lldb`, QEMU crashes with the following report:
+
+```
+qemu-system-aarch64: Error: r = HV_BAD_ARGUMENT (0xfae94003, at ../target/arm/hvf/hvf.c:2259)
+```
+Steps to reproduce:
+1. Run QEMU with `-accel hvf` + `-gdb "tcp::1234"` and a custom kernel (`-kernel Image`)
+2. Try to attach using `lldb vmlinux` + `(lldb) gdb-remote 1234`
+Additional information:
+Debugging QEMU I see the crash is due to the `cpu->accel->fd` file descriptor being `0`:
+
+```
+warning: qemu-system-aarch64 was compiled with optimization - stepping may behave oddly; variables may not be available.
+frame #4: 0x00000001003dd24c qemu-system-aarch64`hvf_arch_update_guest_debug [inlined] hvf_put_guest_debug_registers(cpu=0x0000000158118000) at hvf.c:2259:9 [opt]
+   2256     for (i = 0; i < max_hw_bps; i++) {
+   2257         r = hv_vcpu_set_sys_reg(cpu->accel->fd, dbgbcr_regs[i],
+   2258                                 env->cp15.dbgbcr[i]);
+-> 2259         assert_hvf_ok(r);
+   2260         r = hv_vcpu_set_sys_reg(cpu->accel->fd, dbgbvr_regs[i],
+   2261                                 env->cp15.dbgbvr[i]);
+   2262         assert_hvf_ok(r);
+(lldb) print cpu->accel->fd
+(hvf_vcpuid) 0
+(lldb) print dbgbcr_regs[i]
+(const uint16_t) 32773
+(lldb) print env->cp15.dbgbcr[i]
+(uint64_t) 480
+```