Search notes:

arch/x86/boot/compressed/piggy.S

arch/x86/boot/compressed/piggy.S is created when the kernel is made.
piggy.S is used to create arch/x86/boot/compressed/piggy.o which in turn is a requisite to create arch/x86/boot/compressed/vmlinux.
piggy.S is created with the mkpiggy command (See also mkpiggy.c):
arch/x86/boot/compressed/mkpiggy arch/x86/boot/compressed/vmlinux.bin.gz > arch/x86/boot/compressed/piggy.S
The content of piggy.S might be something like
.section ".rodata..compressed","a",@progbits
.globl z_input_len
z_input_len = 12681980
.globl z_output_len
z_output_len = 43473728
.globl input_data, input_data_end
input_data:
.incbin "arch/x86/boot/compressed/vmlinux.bin.gz"
input_data_end:
.section ".rodata","a",@progbits
.globl input_len
input_len:
	.long 12681980
.globl output_len
output_len:
	.long 43473728

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Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/ke...', 1740439863, '18.116.60.123', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/kernel/source/arch/x86/boot/compressed/piggy_S(57): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78