我拥有的:
带有 HWE 5.4.0-136 内核的 Ubuntu 18.04 服务器
systemd-237(无
systemd-pstore
服务)。/sys/module/pstore/parameters/backend
包含(null)
pstore
自动安装到/sys/fs/pstore
EFI 相关信息
dmesg | grep -i efi
:ACPI: UEFI 0x000000003B55B7B8 000048 (v01 ALASKA A M I 00000002 01000013) ACPI: Reserving UEFI table memory at [mem 0x3b55b7b8-0x3b55b7ff]
Pstore 相关的变量
/boot/config
:CONFIG_EFI_VARS_PSTORE=m # CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE is not set CONFIG_CHROMEOS_PSTORE=m CONFIG_PSTORE=y CONFIG_PSTORE_DEFLATE_COMPRESS=y # CONFIG_PSTORE_LZO_COMPRESS is not set # CONFIG_PSTORE_LZ4_COMPRESS is not set # CONFIG_PSTORE_LZ4HC_COMPRESS is not set # CONFIG_PSTORE_842_COMPRESS is not set # CONFIG_PSTORE_ZSTD_COMPRESS is not set CONFIG_PSTORE_COMPRESS=y CONFIG_PSTORE_DEFLATE_COMPRESS_DEFAULT=y CONFIG_PSTORE_COMPRESS_DEFAULT="deflate" # CONFIG_PSTORE_CONSOLE is not set # CONFIG_PSTORE_PMSG is not set # CONFIG_PSTORE_FTRACE is not set CONFIG_PSTORE_RAM=m
我想要的是:
- 内核崩溃后访问 dmesg。
我做了什么:
vi /etc/default/grub
GRUB_CMDLINE_LINUX="pstore.backend=efi efi_pstore.pstore_disable=0"
update-grub
vi /etc/sysctl.d/KernelPanic.conf
kernel.panic=30
vi /etc/modules-load.d/KernelPanic.conf
efi_pstore ramoops
重启后:
lsmod
报告模块已加载,但没有消息dmesg
/sys/module/pstore/parameters/backend
包含efi
dmesg | grep -i pstore
仅显示内核命令行
引发恐慌:
echo 65535 > /proc/sys/kernel/sysrq
sync
echo c > /proc/sysrq-trigger
重启后:
/sys/fs/pstore
是空的——为什么?