https://leo.leung.xyz/wiki/index.php?action=history&feed=atom&title=Sysrq 2026-10-12T15:30:06Z Revision history for this page on the wiki MediaWiki 1.43.6 https://leo.leung.xyz/wiki/index.php?title=Sysrq&diff=6402&oldid=prev 2021-12-30T01:29:57Z

<p>Updated categories</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:29, 30 December 2021</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l28">Line 28:</td> <td colspan="2" class="diff-lineno">Line 28:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Navbox Linux}}[[Category:Linux]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Navbox Linux}}[[Category:Linux]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:LinuxUtilities]]</ins></div></td></tr> <!-- diff cache key wiki:diff:1.41:old-3706:rev-6402:php=table --> </table>

Leo https://leo.leung.xyz/wiki/index.php?title=Sysrq&diff=3706&oldid=prev 2019-09-01T06:22:22Z

<p>Text replacement - &quot;<a href="/wiki/Category:Linux" title="Category:Linux">Category:Linux</a>{{Navbox Linux}}&quot; to &quot;{{Navbox Linux}}<a href="/wiki/Category:Linux" title="Category:Linux">Category:Linux</a>&quot;</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 06:22, 1 September 2019</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l27">Line 27:</td> <td colspan="2" class="diff-lineno">Line 27:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* http://en.wikipedia.org/wiki/Magic_SysRq_key</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* http://en.wikipedia.org/wiki/Magic_SysRq_key</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Linux]]<del style="font-weight: bold; text-decoration: none;">{{Navbox Linux}}</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{Navbox Linux}}</ins>[[Category:Linux]]</div></td></tr> <!-- diff cache key wiki:diff:1.41:old-3343:rev-3706:php=table --> </table>

Leo https://leo.leung.xyz/wiki/index.php?title=Sysrq&diff=3343&oldid=prev 2019-09-01T05:08:33Z

<p>Text replacement - &quot;<a href="/wiki/Category:Linux" title="Category:Linux">Category:Linux</a>&quot; to &quot;<a href="/wiki/Category:Linux" title="Category:Linux">Category:Linux</a>{{Navbox Linux}}&quot;</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:08, 1 September 2019</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l27">Line 27:</td> <td colspan="2" class="diff-lineno">Line 27:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* http://en.wikipedia.org/wiki/Magic_SysRq_key</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* http://en.wikipedia.org/wiki/Magic_SysRq_key</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Linux]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Linux]]<ins style="font-weight: bold; text-decoration: none;">{{Navbox Linux}}</ins></div></td></tr> <!-- diff cache key wiki:diff:1.41:old-2909:rev-3343:php=table --> </table>

Leo https://leo.leung.xyz/wiki/index.php?title=Sysrq&diff=2909&oldid=prev 2019-08-15T15:50:31Z

<p>Created page with &quot;The magic SysRq key provides a way to instruct the kernel through the {{code|/proc}} pseudo-filesystem. It must be enabled with the kernel during compile time with the {{code|...&quot;</p> <p><b>New page</b></p><div>The magic SysRq key provides a way to instruct the kernel through the {{code|/proc}} pseudo-filesystem. It must be enabled with the kernel during compile time with the {{code|CONFIG_MAGIC_SYSRQ}} option and is standard for most distributions.<br /> <br /> == Rebooting ==<br /> Suppose you have a system that you can SSH into but cannot reboot because the system disk is dying or the SATA bus is in some weird state and no IO is actually working.<br /> <br /> {{highlight|lang=terminal|code=<br /> # reboot<br /> bash: /sbin/reboot: Input/output error<br /> # shutdown -r now<br /> bash: /sbin/shutdown: Input/output error<br /> }}<br /> <br /> Or perhaps the system disk is fine, but {{code|sync()}} isn&#039;t returning which causes {{code|reboot}} to hang even with the {{code|-f}} option. <br /> <br /> To reboot the machine in such a state, enable sysrq and write &#039;b&#039; to the sysrq-trigger.<br /> <br /> {{highlight|lang=terminal|code=<br /> ## Enable sysrq<br /> # echo 1 &gt; /proc/sys/kernel/sysrq<br /> <br /> ## Reboot the machine without sync immediately<br /> # echo b &gt; /proc/sysrq-trigger<br /> }}<br /> <br /> == See Also ==<br /> * https://www.mjmwired.net/kernel/Documentation/sysrq.txt<br /> * http://en.wikipedia.org/wiki/Magic_SysRq_key<br /> <br /> [[Category:Linux]]</div>

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