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+id = 1768
+title = "Could not allocate more than ~2GB with qemu-user"
+state = "closed"
+created_at = "2023-07-18T12:15:24.069Z"
+closed_at = "2023-07-25T17:27:25.780Z"
+labels = []
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1768"
+host-os = "Slackware GNU/Linux"
+host-arch = "x86_64"
+qemu-version = "8.0.50 (git commit hash 4633c1e2c576fbabfe5c8c93f4b842504b69c096)"
+guest-os = "GNU/Linux user-space"
+guest-arch = "arm, hppa, i386, or1k, ppc, sparc"
+description = """On qemu-user, failed to allocate more than about 2GB on 32bit platform supporting up to 4GB (arm, ppc, etc.)"""
+reproduce = """1. Try to allocate more than 2GB [e.g. for(i=0;i<64;i++) if(malloc(64*1024*1024)==NULL) perror("Failed to allocate 64MB");]
+2. Only 1 64MB chunck is allocated in the upper 2GB memory space
+3. Failed to allocate after about 2GB."""
+additional = """The problem is in **pageflags_find** and **pageflags_next** functions (found in _accel/tcg/user-exec.c_) 3rd parameters, that should be **target_ulong** instead of incorrect _target_long_ (the parameter will be converted signed extended to uint64_t).
+The testing program is the following:
+```
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc,char *argv[]) {
+  unsigned int a;
+  unsigned int i;
+  char *al;
+  unsigned int sss=1U*1024*1024*64;
+  for(a=0;a<128;a++) {
+    al=malloc(sss);
+    if(al!=NULL) {
+      printf("ALLOC OK %u (%08lX)!\\n",sss*(a+1),al);
+    }
+    else {
+      printf("Cannot alloc %d\\n",(a+1)*sss);
+      perror("Cannot alloc");
+      exit(1);
+    }
+  }
+}
+```"""