add 18th iteration of classifier

1 files changed, 44 insertions, 0 deletions

diff --git a/results/classifier/118/kernel/1650 b/results/classifier/118/kernel/1650
new file mode 100644
index 00000000..af1d56bc
--- /dev/null
+++ b/results/classifier/118/kernel/1650
@@ -0,0 +1,44 @@
+i386: 0.969
+kernel: 0.938
+x86: 0.893
+performance: 0.872
+device: 0.836
+architecture: 0.812
+graphic: 0.772
+network: 0.750
+semantic: 0.731
+debug: 0.675
+virtual: 0.643
+PID: 0.551
+vnc: 0.487
+permissions: 0.483
+hypervisor: 0.428
+mistranslation: 0.424
+TCG: 0.420
+VMM: 0.413
+risc-v: 0.390
+ppc: 0.367
+boot: 0.348
+register: 0.318
+peripherals: 0.315
+user-level: 0.299
+socket: 0.283
+KVM: 0.226
+arm: 0.209
+files: 0.130
+assembly: 0.120
+
+Consider doing runtime detection of MAP_FIXED_NOREPLACE
+Description of problem:
+```
+qemu-i386-static: Unable to reserve 0xfffff000 bytes of virtual address space at 0x1000 (Operation not supported) for use as guest address space (check your virtual memory ulimit setting, min_mmap_addr or reserve less using -R option)
+```
+strace says
+```
+ mmap(0x1000, 4294963200, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE|MAP_FIXED_NOREPLACE, -1, 0) = -1 EOPNOTSUPP (Operation not supported)
+```
+Steps to reproduce:
+1. `apt install qemu-i386-static 32subsystem`
+2. `strace qemu-i386-static /opt/32/bin/as`
+Additional information:
+Repeating the strace call in a minimal C program gives the same errno as expected -- the kernel is only 4.4. The problem here is that qemu only does `MAP_FIXED_NOREPLACE` feature detection at build-time via a `#ifndef` and even that behavior is poorly documented. Maybe do something at runtime?