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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:07 +0200 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:17 +0200 |
| commit | 9260319e7411ff8281700a532caa436f40120ec4 (patch) | |
| tree | 2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_missing/host_missing/accel_missing/1650 | |
| parent | 225caa38269323af1bfc2daadff5ec8bd930747f (diff) | |
| download | qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.tar.gz qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.zip | |
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Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_missing/1650')
| -rw-r--r-- | gitlab/issues_text/target_missing/host_missing/accel_missing/1650 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gitlab/issues_text/target_missing/host_missing/accel_missing/1650 b/gitlab/issues_text/target_missing/host_missing/accel_missing/1650 new file mode 100644 index 000000000..63984c3bf --- /dev/null +++ b/gitlab/issues_text/target_missing/host_missing/accel_missing/1650 @@ -0,0 +1,14 @@ +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? |