** Description changed: - **************** - HOW TO REPRODUCE - **************** + [Impact] + Crash is useless on trusty/arm64 - On an system that uses the ARM64 architecture, run the "crash" utility. + [Test Case] + BAD (today): + dannf@mustang:~$ sudo crash /usr/lib/debug/boot/vmlinux-3.13.0-37-generic - ****************** - EXPECTED BEHAVIOUR - ****************** + crash 7.0.3 + Copyright (C) 2002-2013 Red Hat, Inc. + Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation + Copyright (C) 1999-2006 Hewlett-Packard Co + Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited + Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. + Copyright (C) 2005, 2011 NEC Corporation + Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. + Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. + This program is free software, covered by the GNU General Public License, + and you are welcome to change it and/or distribute copies of it under + certain conditions. Enter "help copying" to see the conditions. + This program has absolutely no warranty. Enter "help warranty" for details. + + WARNING: arm64_verify_symbol: function not implemented + WARNING: arm64_verify_symbol: function not implemented + [repeats, ad nauseum] + WARNING: arm64_verify_symbol: function not implemented + WARNING: arm64_verify_symbol: function not implemented + GNU gdb (GDB) 7.6 + Copyright (C) 2013 Free Software Foundation, Inc. + License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> + This is free software: you are free to change and redistribute it. + There is NO WARRANTY, to the extent permitted by law. Type "show copying" + and "show warranty" for details. + This GDB was configured as "aarch64-unknown-linux-gnu"... - - The "crash" utility to work. + crash: read error: kernel virtual address: ffffffc000612ce0 type: "cpu_possible_mask" + dannf@mustang:~$ - ************** - REAL BEHAVIOUR - ************** - - The "crash" utility doesn't work. + GOOD: + dannf@mustang:~$ sudo crash /usr/lib/debug/boot/vmlinux-3.13.0-37-generic - ************ - PROPOSED FIX - ************ + crash 7.0.3 + Copyright (C) 2002-2013 Red Hat, Inc. + Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation + Copyright (C) 1999-2006 Hewlett-Packard Co + Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited + Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. + Copyright (C) 2005, 2011 NEC Corporation + Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. + Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. + This program is free software, covered by the GNU General Public License, + and you are welcome to change it and/or distribute copies of it under + certain conditions. Enter "help copying" to see the conditions. + This program has absolutely no warranty. Enter "help warranty" for details. + + GNU gdb (GDB) 7.6 + Copyright (C) 2013 Free Software Foundation, Inc. + License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> + This is free software: you are free to change and redistribute it. + There is NO WARRANTY, to the extent permitted by law. Type "show copying" + and "show warranty" for details. + This GDB was configured as "aarch64-unknown-linux-gnu"... - - To clean merge into Ubuntu the <https://github.com/crash- - utility/crash/commit/0f6d989aa091a97e979ea01fb15e05cc22673de7> commit, - which updates the ARM64 implementation to support Linux 3.13 and later. + KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-37-generic + DUMPFILE: /dev/mem + CPUS: 8 + DATE: Tue Sep 30 15:24:37 2014 + UPTIME: 2 days, 05:04:47 + LOAD AVERAGE: 0.20, 0.59, 0.62 + TASKS: 150 + NODENAME: mustang + RELEASE: 3.13.0-37-generic + VERSION: #64-Ubuntu SMP Mon Sep 22 21:32:32 UTC 2014 + MACHINE: aarch64 (unknown Mhz) + MEMORY: 16 GB + PID: 19911 + COMMAND: "crash" + TASK: ffffffc21d18c200 [THREAD_INFO: ffffffc3e6978000] + CPU: 3 + STATE: TASK_RUNNING (ACTIVE) - - Since the change only affects the ARM64 architecture, there is no - potential regression. + crash> dis sys_read + 0xffffffc0001a6bc0 <SyS_read>: stp x29, x30, [sp,#-80]! + 0xffffffc0001a6bc4 <sys_read+4>: mov x29, sp + 0xffffffc0001a6bc8 <sys_read+8>: stp x19, x20, [sp,#16] + 0xffffffc0001a6bcc <sys_read+12>: mov x20, x1 + 0xffffffc0001a6bd0 <sys_read+16>: add x1, x29, #0x48 + 0xffffffc0001a6bd4 <sys_read+20>: str x21, [sp,#32] + 0xffffffc0001a6bd8 <sys_read+24>: str x2, [x29,#56] + 0xffffffc0001a6bdc <sys_read+28>: bl 0xffffffc0001c1d4c <fget_light> + 0xffffffc0001a6be0 <sys_read+32>: mov x19, x0 + 0xffffffc0001a6be4 <sys_read+36>: ldr w21, [x29,#72] + 0xffffffc0001a6be8 <sys_read+40>: ldr x2, [x29,#56] + 0xffffffc0001a6bec <sys_read+44>: cbz x0, 0xffffffc0001a6c48 <sys_read+136> + 0xffffffc0001a6bf0 <sys_read+48>: ldr x4, [x0,#72] + 0xffffffc0001a6bf4 <sys_read+52>: mov x1, x20 + 0xffffffc0001a6bf8 <sys_read+56>: add x3, x29, #0x48 + 0xffffffc0001a6bfc <sys_read+60>: str x4, [x29,#72] + 0xffffffc0001a6c00 <sys_read+64>: bl 0xffffffc0001a6080 <vfs_read> + 0xffffffc0001a6c04 <sys_read+68>: mov x20, x0 + 0xffffffc0001a6c08 <sys_read+72>: tbnz x20, #63, 0xffffffc0001a6c14 <sys_read+84> + 0xffffffc0001a6c0c <sys_read+76>: ldr x0, [x29,#72] + 0xffffffc0001a6c10 <sys_read+80>: str x0, [x19,#72] + 0xffffffc0001a6c14 <sys_read+84>: cbnz w21, 0xffffffc0001a6c2c <sys_read+108> + 0xffffffc0001a6c18 <sys_read+88>: mov x0, x20 + 0xffffffc0001a6c1c <sys_read+92>: ldr x21, [sp,#32] + 0xffffffc0001a6c20 <sys_read+96>: ldp x19, x20, [sp,#16] + 0xffffffc0001a6c24 <sys_read+100>: ldp x29, x30, [sp],#80 + 0xffffffc0001a6c28 <sys_read+104>: ret + 0xffffffc0001a6c2c <sys_read+108>: mov x0, x19 + 0xffffffc0001a6c30 <sys_read+112>: bl 0xffffffc0001a7d54 <fput> + 0xffffffc0001a6c34 <sys_read+116>: mov x0, x20 + 0xffffffc0001a6c38 <sys_read+120>: ldr x21, [sp,#32] + 0xffffffc0001a6c3c <sys_read+124>: ldp x19, x20, [sp,#16] + 0xffffffc0001a6c40 <sys_read+128>: ldp x29, x30, [sp],#80 + 0xffffffc0001a6c44 <sys_read+132>: ret + 0xffffffc0001a6c48 <sys_read+136>: mov x20, #0xfffffffffffffff7 // #-9 + 0xffffffc0001a6c4c <sys_read+140>: b 0xffffffc0001a6c18 <SyS_read+88> + crash> quit + dannf@mustang:~$ - **************** - RELEVANT DETAILS - **************** - - - The package's affected versions are the 7.0.3 based. - - - Dave Anderson at - <http://people.redhat.com/anderson/crash.changelog.html> said that some - commands, most notably "bt", don't work yet. + [Regression Risk] + With Ming's proposed backport, risk is low because it only touches code built on arm64. Since crash was useless before, can't get much worse :)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1354349 Title: The "crash" utility doesn't run in ARM64 based devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1354349/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
