Ctrl+Alt+SysRq+U之后浏览器(Chrome或Firefox)为何还能继续浏览网页?

科学之子 · **发表于 :** 2015-12-14 22:14

Ctrl+Alt+SysRq+U之后浏览器(Chrome或Firefox)为何还能继续浏览网页?
尤其是那些还包含图片,视频之类,磁盘系统设置为只读了,这些资源被保存到什么地方了?
是保存在某个特殊的基于内存的目录,还是保存在对用户透明的buffer内存区?

vickycq · **发表于 :** 2015-12-14 22:24

引用:

Ctrl+Alt+SysRq+R
磁盘系统设置为只读了

1.
REISUB

引用:

r – Puts the keyboard into raw mode, taking control of it away from the X server.
e – Sends the terminate signal to all processes, asking them to end gracefully.
i – Sends the kill signal to all processes, forcing them to end immediately.
s – Flushes data from your cache to disk.
u – Remounts all file systems read-only.
b – Reboots your computer.

2.
检查是否启用 /proc/sys/kernel/sysrq
编辑 /etc/sysctl.conf 加入 kernel.sysrq=1

参考
https://en.wikipedia.org/wiki/Magic_SysRq_key
http://askubuntu.com/questions/11002/alt-sysrq-reisub-doesnt-reboot-my-laptop
http://www.howtogeek.com/119127/use-the-magic-sysrq-key-on-linux-to-fix-frozen-x-servers-cleanly-reboot-and-run-other-low-level-commands/
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1025467
http://unix.stackexchange.com/questions/124393/why-isnt-reisub-working-on-debian

科学之子 · **发表于 :** 2015-12-14 22:30

vickycq 写道:

引用:

Ctrl+Alt+SysRq+R
磁盘系统设置为只读了

1.
REISUB

引用:

r – Puts the keyboard into raw mode, taking control of it away from the X server.
e – Sends the terminate signal to all processes, asking them to end gracefully.
i – Sends the kill signal to all processes, forcing them to end immediately.
s – Flushes data from your cache to disk.
u – Remounts all file systems read-only.
b – Reboots your computer.

2.
检查是否启用 /proc/sys/kernel/sysrq
编辑 /etc/sysctl.conf 加入 kernel.sysrq=1

参考
https://en.wikipedia.org/wiki/Magic_SysRq_key
http://askubuntu.com/questions/11002/alt-sysrq-reisub-doesnt-reboot-my-laptop
http://www.howtogeek.com/119127/use-the-magic-sysrq-key-on-linux-to-fix-frozen-x-servers-cleanly-reboot-and-run-other-low-level-commands/
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1025467
http://unix.stackexchange.com/questions/124393/why-isnt-reisub-working-on-debian

我按了这个快捷键之后,就无法创建磁盘文件,dmesg也显示ext4写入错误
所以魔术键应该是有效的
但明明磁盘已经只读了,Chrome和Firefox还能几乎像"没事人"一样正常浏览网页,除了不能执行另存为,好像各种内容的网页都能正常浏览
Ctrl+Alt+SysRq+U才是我想表达的快捷键,刚刚写成R是写错了...

astolia · **发表于 :** 2015-12-14 23:57

为什么你会觉得非要把资源保存到磁盘上才能用呢？

Ctrl+Alt+SysRq+U之后浏览器(Chrome或Firefox)为何还能继续浏览网页?

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