Re: [Crash-utility] Crash issues with ARM aarch64 on a live system

On Wed, May 20, 2020 at 10:19 PM Siamak Nazari <siamaknazari(a)yahoo.com&gt; wrote: > > Apologies if this the wrong place to ask this question. If in fact this is > the wrong alias to post this question, appreciate a pointer in the right > direction. We have been trying to get crash working on a live kernel > (aarch64) but have not been able to. > > Based on the crash help text: > > --machdep option=value > Pass an option and value pair to machine-dependent code. These > architecture-specific option/pairs should only be required in > very rare circumstances: > > ARM64: > phys_offset=<physical-address> > kimage_voffset=<kimage_voffset-value> > max_physmem_bits=<value> > vabits_actual=<value> > > We probably need to specify the proper values for phys_offset and > kimage_voffset. kimage_offset is in /proc/kallsyms, but not phys_offset. > It is just not clear where the values should come from. I did try using > the value of kimage_offset found in /proc/kallsyms but that did not help. > It is not clear where one needs to get the values from (and in fact a > casual reading of the crash source seems to try to compute the values > automatically) > > Here is some additional information: > > # uname -a > Linux bringup 5.1.0 #1 SMP Fri Oct 11 17:01:55 UTC 2019 aarch64 GNU/Linux > > # crash -s > crash: /proc/kcore: No such file or directory Seem like your kernel is not configured with CONFIG_PROC_KCORE (/proc/kcore support). With /proc/kcore you don't need to supply any additional options & values to crash.

> WARNING: could not find MAGIC_START! > WARNING: cannot read linux_banner string > crash: /boot/vmlinux-5.1.0 and /dev/mem do not match! > > This is with additional debugging turned on: > > # ./crash --version > > crash 7.2.8++ > Copyright (C) 2002-2020 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". > > Here is crash running with -d flag: > > find_booted_kernel: check: /boot/vmlinux-5.1.0 > find_booted_kernel: found: /boot/vmlinux-5.1.0 > get_live_memory_source: /dev/mem > /proc/version: > Linux version 5.1.0 (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Fri > Oct 11 17:01:55 UTC 2019 > /boot/vmlinux-5.1.0: > Linux version 5.1.0 (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Fri > Oct 11 17:01:55 UTC 2019 > crash: /proc/kcore: No such file or directory > readmem: read_dev_mem() -> /dev/mem > VA_BITS: 48 > kimage_voffset: fffeffff88000000 > phys_offset: 0 > physvirt_offset: 800000000000 > gdb --quiet /boot/vmlinux-5.1.0 > GETBUF(328 -> 0)fffeffc00fe00000 > GETBUF(1500 -> 1) > FREEBUF(1) > FREEBUF(0) > <readmem: ffff0000109c63b8, KVADDR, "kernel_config_data", 32768, (ROE), > aaaad82d4630> > <read_dev_mem: addr: ffff0000109c63b8 paddr: 889c63b8 cnt: 3144> > <read_dev_mem: addr: ffff0000109c7000 paddr: 889c7000 cnt: 4096> > <read_dev_mem: addr: ffff0000109c8000 paddr: 889c8000 cnt: 4096> > <read_dev_mem: addr: ffff0000109c9000 paddr: 889c9000 cnt: 4096> > <read_dev_mem: addr: ffff0000109ca000 paddr: 889ca000 cnt: 4096> > <read_dev_mem: addr: ffff0000109cb000 paddr: 889cb000 cnt: 4096> > <read_dev_mem: addr: ffff0000109cc000 paddr: 889cc000 cnt: 4096> > <read_dev_mem: addr: ffff0000109cd000 paddr: 889cd000 cnt: 4096> > <read_dev_mem: addr: ffff0000109ce000 paddr: 889ce000 cnt: 952> > <readmem: ffff0000109c63b0, KVADDR, "kernel_config_data MAGIC_START", 8, > (ROE), ffffe6a6d5a0> > <read_dev_mem: addr: ffff0000109c63b0 paddr: 889c63b0 cnt: 8> > WARNING: could not find MAGIC_START! > GETBUF(328 -> 0) > FREEBUF(0) > GETBUF(8 -> 0) > <readmem: ffff000010e1c6d8, KVADDR, "possible", 8, (ROE|Q), aaaacd15f258> > <read_dev_mem: addr: ffff000010e1c6d8 paddr: 88e1c6d8 cnt: 8> > cpu_possible_mask: cpus: (none) > <readmem: ffff000010e1c6d0, KVADDR, "present", 8, (ROE|Q), aaaacd15f258> > <read_dev_mem: addr: ffff000010e1c6d0 paddr: 88e1c6d0 cnt: 8> > cpu_present_mask: cpus: (none) > <readmem: ffff000010e1c6c8, KVADDR, "online", 8, (ROE|Q), aaaacd15f258> > <read_dev_mem: addr: ffff000010e1c6c8 paddr: 88e1c6c8 cnt: 8> > cpu_online_mask: cpus: (none) > <readmem: ffff000010e1c6e0, KVADDR, "active", 8, (ROE|Q), aaaacd15f258> > <read_dev_mem: addr: ffff000010e1c6e0 paddr: 88e1c6e0 cnt: 8> > cpu_active_mask: cpus: (none) > FREEBUF(0) > GETBUF(328 -> 0) > FREEBUF(0) > GETBUF(328 -> 0) > FREEBUF(0) > GETBUF(328 -> 0) > FREEBUF(0) > <readmem: ffff000010ef8150, KVADDR, "shadow_timekeeper xtime_sec", 8, > (ROE), ffffe6a650b8> > <read_dev_mem: addr: ffff000010ef8150 paddr: 88ef8150 cnt: 8> > xtime timespec.tv_sec: 0: Wed Dec 31 16:00:00 1969 > <readmem: ffff000010e2533c, KVADDR, "init_uts_ns", 390, (ROE), > aaaacd0fd194> > <read_dev_mem: addr: ffff000010e2533c paddr: 88e2533c cnt: 390> > utsname: > sysname: > nodename: > release: > version: > machine: > domainname: > base kernel version: 0.0.0 > <readmem: ffff0000109b0098, KVADDR, "accessible check", 8, (ROE|Q), > ffffe6a64770> > <read_dev_mem: addr: ffff0000109b0098 paddr: 889b0098 cnt: 8> > <readmem: ffff0000109b0098, KVADDR, "read_string characters", 1499, > (ROE|Q), ffffe6a64ae8> > <read_dev_mem: addr: ffff0000109b0098 paddr: 889b0098 cnt: 1499> > WARNING: cannot read linux_banner string > /proc/version: > Linux version 5.1.0 (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Fri > Oct 11 17:01:55 UTC 2019 > linux_banner: > > crash: /boot/vmlinux-5.1.0 and /dev/mem do not match! > > > > > -- > Crash-utility mailing list > Crash-utility(a)redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility