Download from: http://people.redhat.com/anderson or https://github.com/crash-utility/crash/releases The master branch serves as a development branch that will contain all patches that are queued for the next release: $ git clone git://github.com/crash-utility/crash.git Changelog: - Enhancement of the ARM64 backtrace capability. Without the patch, backtraces of the active tasks start at the function that is saved in each per-cpu ELF note. With the patch, the backtrace will start at the "crash_kexec" function on the panicking cpu, and at the "crash_save_cpu" function on the other active cpus. By doing so, the backtrace will display the exception handling functions leading to crash_kexec() or crash_save_cpu(), as well as the exception frame register set as it was at the time of the fatal exception on the panic cpu, or when the shutdown IPI was received on the other cpus. (anderson(a)redhat.com) - Enabled the "bt -R" option on the ARM64 architecture. Without the patch, the option fails with the message "bt: -R option not supported or applicable on this architecture or kernel". (anderson(a)redhat.com) - Enabled the "crash --log vmcore" command line option on the ARM64 architecture. Without the patch, the option fails with the message "crash: crash --log not implemented on ARM64: TBD". (anderson(a)redhat.com) - Fix for the S390X "bt" command when running against kernels that have Linux 4.0 commit 2f859d0dad818765117c1cecb24b3bc7f4592074, which removes the "async_stack" and "panic_stack" members from the "pcpu" structure. Without the patch, backtraces of active tasks that were executing I/O or machine check interrupts are not displayed, while other tasks may generate fatal readmem() errors of type "readmem_ul". (holzheu(a)linux.vnet.ibm.com) - Fix to prevent an unnecessary/temporary GETBUF() memory allocation of 1 MB by the dump_mem_map() utility function when the kernel is configured with CONFIG_SPARSEMEM. (yangoliver(a)gmail.com) - Speed up the "crash --osrelease" option when used with "flattened" format dumpfiles. Without the patch, the rearranged data array initialization is performed before the vmcoreinfo data in the header is read, which can take a significant amount of time with large dumpfiles. The patch simply looks for the appropriate vmcoreinfo data string near the beginning of the dumpfile. (anderson(a)redhat.com) - Fix for the initialization-time sorting mechanism required for "flattened format" dumpfiles if the dumpfile is truncated/incomplete. Without the patch, the sorting function continues performing invalid reads beyond the of the dumpfile, which may lead to an infinite loop instead of a session-ending error message. In addition, since the sorting operation may take several minutes, a "please wait" message with an incrementing percentage-complete counter will be displayed. (anderson(a)redhat.com) - Several fixes associated with the gathering and display of task state. Without the patch: (1) The "ps" command's ST column shows "??" for tasks in the TASK_WAKING state. (2) The "ps" command's ST column shows "??" for tasks in the TASK_PARKED state in Linux 3.14 and later kernels. (3) The STATE field of the initial system banner and the "set" command are incorrect if the task state has the TASK_WAKING, TASK_WAKEKILL modifier, or TASK_PARKED bits set in Linux 3.14 and later kernels. (4) The "foreach DE" task identifier fails if a task with a PID number of 0xDE (222) exists. (5) The "foreach" command's "SW", "PA", "TR" and "DE" task identifiers inadvertently select all tasks in kernel versions that do not have those states. (6) The "help -t" output would display incorrect values for the TASK_WAKEKILL, TASK_WAKING and TASK_PARKED states in Linux 3.14 and later kernels. Lastly, support for the TASK_NOLOAD modifier introduced in Linux 4.2 has been added to STATE field of the "set" command and the initial system banner. (anderson(a)redhat.com) - Fix for the internal memory allocation functionality. Without the patch, in the unlikely event where the GETBUF() facility has to utilize malloc() to allocate a buffer, and CTRL-c is entered while that buffer is being zeroed out before being returned to the caller, it may result in a never-ending set of "malloc-free mismatch" error messages. (anderson(a)redhat.com) - Fix for the PPC64 "bt" command for active non-panic tasks. Without the patch, the backtrace may fail immediately with the error message "bt: invalid kernel virtual address: f type: Regs NIP value". (anderson(a)redhat.com) - Fix for the "bt" command on little-endian PPC64 machines for tasks that are blocked in __schedule(). Without the patch, there will be two "__switch_to" frames displayed before the normal "__schedule" frame that is used as the starting point for blocked tasks. (anderson(a)redhat.com) - Fix for the PPC64 "bt" command to align its exception frame verifier function with the most recent version of the kernel's getvecname() function, which was updated in Linux 3.12. Without the patch, the "Hypervisor Decrementer", "Emulation Assist", "Hypervisor Doorbell", "Altivec Unavailable", "Instruction Breakpoint", "Denormalisation", "HMI" and "Altivec Assist" exception types are not recognized and their exception frames not displayed; the "Doorbell" exception type is marked as a "reserved" exception type, (anderson(a)redhat.com) - Fix for the "timer" command when run on a kernel with a large number of cpus. Without the patch, the command may fail prematurely with a dump of the internal crash utility allocated buffer statistics followed by the message "timer: cannot allocate any more memory!", (anderson(a)redhat.com) - Commit f95ecdc330a11d3701de859aab59a5ab5954aae6, which speeds up "crash --osrelease" for flattened format dumpfiles, inadvertently broke the option for ELF kdump and compressed kdump dumpfiles. (anderson(a)redhat.com) - Implementation of two new "files" command options. The "files -c" option is context-sensitive, similar to the the regular "files" command when used without an argument, but replaces the FILE and DENTRY columns with I_MAPPING and NRPAGES columns that reflect each open file's inode.i_mapping address_space structure address, and the address_space.nrpages count within it; this shows how many of each open file's pages are currently in the system's page cache. The "files -p <inode>" option takes the address of an inode, and dumps all of its pages that are currently in the system's page cache, borrowing the "kmem -p" page structure output. (yangoliver(a)gmail.com) - Modified the qualification for the execution of the "runq -g" option. Without the patch, if the target kernel was not configured with both CONFIG_FAIR_GROUP_SCHED and CONFIG_RT_GROUP_SCHED, the command fails with the message "runq: -g option not supported or applicable on this architecture or kernel". With this patch, if the kernel was built with either CONFIG_FAIR_GROUP_SCHED or CONFIG_RT_GROUP_SCHED, the command will execute. (rabinv(a)axis.com) - Fix for the error handling of the "foreach task -R struct.member" format if an invalid structure and/or member is used as an argument. Without the patch, the command will display the expected error indicating "task: invalid structure member reference", but then will be followed by a stream of "task: recursive temporary file usage" error messages. (anderson(a)redhat.com) - Force the 32-bit MIPS extensions/eppic.so to be compiled with -m32. This is required when "make extensions" is executed after the top level crash binary has been built with "make TARGET=MIPS" on an x86_64 host. (rabinv(a)axis.com) - If the starting hexadecimal address of a function is passed to the "dis" command without a count argument, disassemble the entire function -- similar to when a symbol name of a function is passed without a count argument. Without the patch, only one instruction is displayed. (atomlin(a)redhat.com) - Fix compiler warning generated by extensions/trace.c when compiled with gcc version 5. Without the patch, the message "warning: the use of 'mktemp' is dangerous, better use 'mkstemp'" is generated. (anderson(a)redhat.com) - Update the extensions/eppic.mk file to clone the eppic source code from https://github.com/lucchouina/eppic.git. (lucchouina(a)gmail.com) - Export the previously static symbol_name_count() function, which returns a count of symbols with the same name. Export a new is_symbol_text() function, which checks whether specified symbol entry is a type 't' or 'T'. (atomlin(a)redhat.com, anderson(a)redhat.com) - If a symbol or symbol+offset argument is passed to the "dis" command, and there are multiple text symbols with the same symbol name, then display a message indicating that there are "duplicate text symbols found", followed by a list of the symbols. Without the patch, the duplicate symbol with the lowest virtual address is used. (atomlin(a)redhat.com, anderson(a)redhat.com)