Stefano, Paolo,
I have an interesting fail in QEMU
2019-10-04T12:00:32.675188Z qemu-system-s390x: GLib: g_mapped_file_unref: assertion 'file != NULL' failed
that bisected to
commit 816b9fe450220e19acb91a0ce4a8ade7000648d1 (refs/bisect/bad)
elf-ops.h: Map into memory the ELF to load
strace tells that I can read the ELF file, but not mmap
strace:
214365 openat(AT_FDCWD, "/var/lib/libvirt/images/test_cpu_timer.elf", O_RDONLY) = 36
214365 read(46, "\177ELF\2\2\1\0\0\0\0\0\0\0\0\0", 16) = 16
214365 lseek(46, 0, SEEK_SET) = 0
[...]
214365 fstat(46, {st_mode=S_IFREG|0755, st_size=168176, ...}) = 0
214365 mmap(NULL, 168176, PROT_READ|PROT_WRITE, MAP_PRIVATE, 46, 0) = -1 EACCES (Permission denied)
So reading from /var/lib/libvirt/images/test_cpu_timer.elf does work, mmaping does not.
setenforce 0 makes the problem go away.
This might be more of an issue in libvirt, setting the svirt context too
restrictive, but I am not too deep into the svirt part of libvirt.
Reverting the qemu commit makes the problem go away.
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