<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Hi Crash</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> I'll keep refining the patch before it get approved:</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <ol> <li>Fix the error in arm64_overflow_stack_init() which saved the overflow stack address into ms->irqstacks[], which would cause bt command crash on other cpus. The normal IRQ stacks should be used for bt command for other cpus.</li><li>In addition to unwind on the overflow stack, try to go through the IRQ stack to find more useful information</li></ol> <div>Kernel stack overflow case would be rarely but I'd like to sharp the crash to cover this kind of issue.</div> <div><br> </div> <div>Best regards</div> <div>Hong</div> </div> <div id="appendonsend"></div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Hong Yang3 Соєм<br> <b>Sent:</b> Tuesday, November 16, 2021 9:55<br> <b>To:</b> crash-utility@redhat.com <crash-utility@redhat.com><br> <b>Subject:</b> arm64: Support overflow stack panic</font> <div> </div> </div> <style type="text/css" style="display:none">  </style> <div dir="ltr"> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Hi All</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> When I was trying to open a core of an overflow stack panic result, the bt command caused a segment fault, after a while I figured out the overflow stack is not supported by crash utility.</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> This patch is trying to initialize the overflow stack information on startup stage, and the bt command works as expected to dump the correct call trace in the overflow stack, currently it only apply to arm64 target.</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> I'm not sure if any other sub command also need to be fixed for full support for the overflow stack, please advise and I'll try to improve the patch.</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Thanks</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Hong YANG</div> </div> </body> </html>