<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>Hello,</div><div><br></div><div><div>Sure, we can provide acces to the dump.</div><div><br></div><div><br>Saludos / Regards,<br></div><div><br></div><div>Eddy Castillon</div><div>System Infrastructure Engineer<br>Axcess Financial | Peru<br>ecastillon@axcess-financial.com<br>Office: +51 - 6408117 - 2175</div><div>Cellphone: 983270761<br>http://www.axcess-financial.com.pe</div><span name="x"></span><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Ilya Dryomov" <idryomov@redhat.com><br><b>To: </b>crash-utility@redhat.com<br><b>Cc: </b>"Castillon de la Cruz, Eddy Gonzalo" <ecastillon@axcess-financial.com><br><b>Sent: </b>Monday, January 5, 2015 9:16:09 AM<br><b>Subject: </b>crash: invalid kernel virtual address: 0 type: "memory section"<br><div><br></div>Hello,<br><div><br></div>I have a couple dumps generated on Ubuntu Trusty LTS (3.13.0-39-generic<br>kernel) which crash fails on.<br><div><br></div>$ ./crash ../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic<br>../dump.201412280256<br><div><br></div>crash 7.0.9<br>Copyright (C) 2002-2014 Red Hat, Inc.<br>Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation<br>Copyright (C) 1999-2006 Hewlett-Packard Co<br>Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited<br>Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.<br>Copyright (C) 2005, 2011 NEC Corporation<br>Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.<br>Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.<br>This program is free software, covered by the GNU General Public License,<br>and you are welcome to change it and/or distribute copies of it under<br>certain conditions. Enter "help copying" to see the conditions.<br>This program has absolutely no warranty. Enter "help warranty" for details.<br><div><br></div>GNU gdb (GDB) 7.6<br>Copyright (C) 2013 Free Software Foundation, Inc.<br>License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html><br>This is free software: you are free to change and redistribute it.<br>There is NO WARRANTY, to the extent permitted by law. Type "show copying"<br>and "show warranty" for details.<br>This GDB was configured as "x86_64-unknown-linux-gnu"...<br><div><br></div>crash: cannot determine thread return address<br>please wait... (gathering kmem slab cache data)<br>crash: invalid kernel virtual address: 1c type: "kmem_cache<br>objsize/object_size"<br>crash: failed to read pageflag_names entry<br>please wait... (gathering module symbol data)<br>WARNING: invalid kernel module size: 0<br><div><br></div>crash: cannot determine idle task addresses from init_tasks[] or runqueues[]<br><div><br></div>crash: cannot resolve "init_task_union"<br><div><br></div><br>vmlinux-3.13.0-39-generic was extracted from Ubuntu ddeb:<br><div><br></div>$ file ../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic<br>../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic: ELF 64-bit LSB<br>executable, x86-64, version 1 (SYSV), statically linked,<br>BuildID[sha1]=c4fa631d2cc34a0b2628a5de01a04e81a0667555, not stripped<br><div><br></div>With -d8 I get:<br><div><br></div>...<br><read_diskdump: addr: ffffffffffffffff paddr: 7fffffff cnt: 1><br>read_diskdump: paddr/pfn: 7fffffff/7ffff -> cache physical page: 7ffff000<br>crash: invalid kernel virtual address: 0 type: "memory section"<br><div><br></div>The entire -d8 output is attached.<br><div><br></div>Bogus "base kernel version" stands out immediately and I'm pretty sure<br>I've seen "0.0.0" in there a couple times with exactly the same dump.<br>From a quick look, the base kernel version code in kernel.c is not safe<br>against kt->utsname.release being all zeroes.<br><div><br></div>Eddy Gonzalo (CC'ed) can probably provide access to the dumps if<br>needed.<br><div><br></div>Thanks,<br><div><br></div> Ilya<br></div><div><br></div></div> <br><html><body><b>NOTICE: Protect the information in this message in accordance with the company's security policies. If you received this message in error, immediately notify the sender and destroy all copies.</b></body></html> <br></body></html>