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--- software:freebsd:kernel_debug [2022/02/04 18:33]
– removed - external edit (Unknown date) 127.0.0.1
+++ software:freebsd:kernel_debug [2022/02/05 05:06]
– root
@@ Line 1: / Line 1: @@
+====== FreeBSD kernel debug ======
+Опции и параметры необходимые для получения coredump ядра.\\
+Актуально для FreeBSD 11.2, 12.0
+===== Конфиг ядра =====
+Должен содержать:
+<code>
+options		GZIO			#m zlib I/O stream support. Enables support for compressed core dumps.
+# Debugging support. Always need this:
+makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols
+options		HWPMC_HOOKS		#oD Necessary kernel hooks for hwpmc(4)
+options		KDB			#oD Enable kernel debugger support, rquied for DDB, GDB. Little or no performance overhead.
+options		KDB_TRACE		#oD Set debug.trace_on_panic=1 - Print a stack trace for a panic.
+options		KDB_UNATTENDED		#oD Set debug.debugger_on_panic=0 - reboot.
+options		KTRACE			#oD ktrace(1) support
+options		STACK			#oD stack(9) support
+options		PANIC_REBOOT_WAIT_TIME=16 #o Set the amount of time (in seconds) the system will wait before rebooting automatically when a kernel panic occurs. (-1) = inf
+</code>
+===== Настройки системы =====
+==== /etc/rc.conf ====
+<code># Debug
+dumpdev="AUTO"			# Device to crashdump to (device name, AUTO, or NO).
+dumpon_flags="-z"		# Options to pass to dumpon(8), followed by dumpdev.
+savecore_enable="YES"		# Extract core from dump devices if any
+savecore_flags="-z -v -m 16"	# Used if dumpdev is enabled above, and present.
+crashinfo_enable="YES"		# Automatically generate crash dump summary.
+</code>
+==== /etc/sysctl.conf ====
+<code># Debug kernel
+debug.minidump=1			# Enable mini crash dumps
+kern.sync_on_panic=0			# Do a sync before rebooting from a panic / 0 - required for coredump write
+kern.panic_reboot_wait_time=16		# Seconds to wait before rebooting after a panic
+kern.kerneldump_gzlevel=3		# Kernel crash dump compression level
+</code>
+==== /etc/src.conf ====
+<code>WITH_KERNEL_SYMBOLS=
+# Set to not install kernel symbol files.
+</code>
+Либо файл /etc/src.conf должен отсутствовать, либо в нём не должно быть WITHOUT_KERNEL_SYMBOLS=
+==== /etc/fstab ====
+Вариант с шифрованным swap:
+<code>/dev/gptid/0714a812-b98e-11e8-a831-7085c2375722.eli none	swap	sw,late,ealgo=AES-XTS,keylen=256,sectorsize=4096	0	0
+</code>
+Обычный swap:
+<code>/dev/ada1p1		none					swap	sw						0	0</code>
+{{tag>software howto freebsd kernel debug}}

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