I need extract .config file from a kernel-image... but... as a test...
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$ make allnoconfig
$ make menuconfig
General setup --->
[*] Kernel .config support (yes)
$ make
$ ./scripts/extract-ikconfig arch/x86/boot/bzImage
zcat: stdin: decompression OK, trailing garbage ignored
ERROR: Unable to extract kernel configuration information.
This kernel image may not have the config info.
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Why this error?