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What: /sys/kernel/kexec/*
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description:
The /sys/kernel/kexec/* directory contains sysfs files
that provide information about the configuration status
of kexec and kdump.
What: /sys/kernel/kexec/loaded
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description: read only
Indicates whether a new kernel image has been loaded
into memory using the kexec system call. It shows 1 if
a kexec image is present and ready to boot, or 0 if none
is loaded.
User: kexec tools, kdump service
What: /sys/kernel/kexec/crash_loaded
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description: read only
Indicates whether a crash (kdump) kernel is currently
loaded into memory. It shows 1 if a crash kernel has been
successfully loaded for panic handling, or 0 if no crash
kernel is present.
User: Kexec tools, Kdump service
What: /sys/kernel/kexec/crash_size
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description: read/write
Shows the amount of memory reserved for loading the crash
(kdump) kernel. It reports the size, in bytes, of the
crash kernel area defined by the crashkernel= parameter.
This interface also allows reducing the crashkernel
reservation by writing a smaller value, and the reclaimed
space is added back to the system RAM.
User: Kdump service
What: /sys/kernel/kexec/crash_elfcorehdr_size
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description: read only
Indicates the preferred size of the memory buffer for the
ELF core header used by the crash (kdump) kernel. It defines
how much space is needed to hold metadata about the crashed
system, including CPU and memory information. This information
is used by the user space utility kexec to support updating the
in-kernel kdump image during hotplug operations.
User: Kexec tools
What: /sys/kernel/kexec/crash_cma_ranges
Date: Nov 2025
Contact: kexec@lists.infradead.org
Description: read only
Provides information about the memory ranges reserved from
the Contiguous Memory Allocator (CMA) area that are allocated
to the crash (kdump) kernel. It lists the start and end physical
addresses of CMA regions assigned for crashkernel use.
User: kdump service
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