Download from: https://crash-utility.github.io/ or https://github.com/crash-utility/crash/releases The github 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: - Add support for new lockless righbuffer that Linux 5.10 introduced. Without the two patches, crash fails during session initialization or "log" command fails with the error message: crash: cannot determine length of symbol: log_end (john.ogness(a)linutronix.de, nborisov(a)suse.com, k-hagio-ab(a)nec.com) - Add support for VC exception stack on x86_64 Linux 5.10 and later kernels that contain commit 02772fb9b68e ("x86/sev-es: Allocate and map an IST stack for #VC handler"). (amakhalov(a)vmware.com) - Fix regression for raw RAM dumpfiles. Commit f42db6a33f0e ("Support core files with "unusual" layout") increased the minimal file size from MIN_NETDUMP_ELF_HEADER_SIZE to SAFE_NETDUMP_ELF_HEADER_SIZE which can lead to crash rejecting raw RAM dumpfiles. Without the patch, the crash fails to start a session with the error message: /var/tmp/ramdump_elf_XXXXXX: ELF header read: No such file or directory crash: malformed ELF file: /var/tmp/ramdump_elf_XXXXXX (zhaoqianli(a)xiaomi.com) - Update mapping symbol filter in arm64_verify_symbol() to support the long form of mapping symbols, e.g. "$x.<any...>". Without the patch, the "dis" command cannot completely parse out the disassembly of a function that has mapping symbols in the long form and misses the tail part of the function. (zhaoqianli(a)xiaomi.com) - Move extensins/Makefile's ping check to recipe script. Without this patch, in an environment where ping to github.com does not work, "make clean" at the top-level crash directory always takes about 10 seconds unnecessarily. (k-hagio-ab(a)nec.com) - Fix for a segmentation fault when analyzing arm64 kernels that are configured with CONFIG_IKCONFIG and have a strange entry that does not contain the delimiter "=", such as "CONFIG_SECU+[some hex data]". Without the patch, in the add_ikconfig_entry() function, strtok_r() interprets it as consisting of a single token and the val variable is set to NULL, and then strdup() crashes. (liuyun01(a)kylinos.cn) - Fix a couple of issues that were detected by valgrind. (d.hatayama(a)fujitsu.com) - Add ability to un-set scope. The ability can come in very useful when running automated pykdump scripts and needing scope to be cleared between script runs. (jpittman(a)redhat.com) - Fix "sys [-t]|mod -S" after "mod -t" when crash runs with -s option. Without the patch, the "sys [-t]" and "mod -S" options after "mod -t" option fail with the error message: sys: invalid structure member offset: tnt_false FILE: kernel.c LINE: 11203 FUNCTION: show_kernel_taints_v4_10() (k-hagio-ab(a)nec.com) - Fix for "dev -d" option on Linux 5.11-rc1 and later kernels that contains commit 0d02129e76edf91cf04fabf1efbc3a9a1f1d729a ("block: merge struct block_device and struct hd_struct"). Without the patch, the option fails with the error message: dev: invalid structure member offset: hd_struct_dev (k-hagio-ab(a)nec.com) - Fix for "kmem -v" option on Linux 5.11-rc1 and later kernels that contain commit 96e2db456135db0cf2476b6890f1e8b2fdcf21eb ("mm/vmalloc: rework the drain logic"). Without the patch, the option will display nothing or fail with the error message: kmem: invalid kernel virtual address: <address> type: "vmlist addr" (k-hagio-ab(a)nec.com) - Add the base address of module to "mod" command output. Currently the command shows the address of the module struct, but it is inconvenient to know the address range of the module, so extend to show the base adddress. (yeyunfeng(a)huawei.com, k-hagio-ab(a)nec.com) - Increase the value of __PHYSICAL_MASK_SHIFT_XEN to 52. The former value of __PHYSICAL_MASK_SHIFT_XEN in crash (40) is smaller than the kernel (52) since kernel commit 6f0e8bf167 (xen: support 52 bit physical addresses in pv guests). This can cause x86_64_pud_offset() to lose the most significant bits of pgd_pte, leading to a failed xen_m2p() translation, resulting in crash failing with an error message like this: crash: read error: physical address: ffffffffffffffff type: "pud page" (jbohac(a)suse.cz) - Change log level print in older kernels. In older kernels that have the variable-length-record log_buf, the log level and the log flags/facility are not separated. Since the log level is only the last three bits, and the flags/facility and level are separated in 5.10 and later kernels, only print those last three bits when using 'log -m'. (jpittman(a)redhat.com) - Reduce crash build log. The verbose output of tar command when extracting the GDB source files occupies more than the half of crash build log. It is not so helpful and makes the build log longer needlessly especially on CI build test without the patch. (k-hagio-ab(a)nec.com) - Fix for "bt" command on Linux 5.12-rc1 and later x86_64 kernels that contain commit 951c2a51ae75 ("x86/irq/64: Adjust the per CPU irq stack pointer by 8"). Without the patch, the "bt" command and some of its options that read irq stack fail with the error message: bt: read of stack at <address> failed". (k-hagio-ab(a)nec.com) - Add valgrind support for the crash's custom memory allocator. This helps detecting various memory errors on the crash's custom memory allocator. (d.hatayama(a)fujitsu.com) - Fix for a couple of invalid read/write issues detected by valgrind. (d.hatayama(a)fujitsu.com) - Fix "struct" command to print member array of list_heads correctly. Without the patch, due to the way that an array of list_head entries are printed, parsing of them fails and the command does not print anything: crash> struct blk_mq_ctx.rq_completed ffffc447ffc0f740 crash> (jpittman(a)redhat.com) - Do not pass through 'sy' command to GDB. The GDB 'symbol-file' command is prohibited in the crash utility, but an abbreviation of it, the 'sy' is not prohibited. This can discard symbol table from the current symbol file, and eventually caused the failure of crash utility after executing the 'sys' command as below: crash> sy Discard symbol table from `/path/to/vmlinux'? (y or n) Please answer y or n. Discard symbol table from `/path/to/vmlinux'? (y or n) No symbol file now. crash> sys double free or corruption (!prev) Aborted (core dumped) (lijiang(a)redhat.com) - Refine zram related code for crash gcore command to support it. (d.hatayama(a)fujitsu.com) - Fix for the failure of 'set scope' command. Without the patch, some commands such as 'sys' may cause subsequent 'set scope' commands to fail. (lijiang(a)redhat.com) - Fix for offset print for function pointers that return pointers. In the show_member_offset() function, when trying to handle function pointers, the case for "(*" is handled. However, if the function pointer returns a pointer or a pointer to a pointer, then the condition is unhandled. This results in the offset not being printed without the patch, for example: crash> struct -o offload_callbacks struct offload_callbacks { struct sk_buff *(*gso_segment)(struct sk_buff *, netdev_features_t); struct sk_buff **(*gro_receive)(struct sk_buff **, struct sk_buff *); [16] int (*gro_complete)(struct sk_buff *, int); } (jpittman(a)redhat.com) - Change functions within extensions/echo.c to be static and document the issue in code comments, for extensions developers who takes echo.c as reference, to avoid the issue that symbols in extension modules are overwritten by former loaded one if it's the same name. (ltao(a)redhat.com) - Fix for 'bt' command and options on Linux 5.8-rc1 and later x86_64 kernels that contain merge commit 076f14be7fc9. The merged patches changed the name of exception functions that have been used by the crash utility to check the exception frame. Without the patch, the command and options cannot display it. (k-hagio-ab(a)nec.com) - Fix for xen kernels that contain commit edcb5cf84f05 ("x86/paravirt/xen: Remove xen_patch()"). Withouth the patch, crash fails with an error message like this: crash: seek error: physical address: 83640e000 type: "pud page" (john.p.donnelly(a)oracle.com, k-hagio-ab(a)nec.com) - Remove extensions/trace.c file, as the extension module moved to the separate repository from the crash repository. (k-hagio-ab(a)nec.com) - Fix for uvtop conversion on ARM with LPAE. Without the patch, arm_uvtop() calls arm_lpae_vtop() with the LPAE and it can use LPAE_VTOP() also for a user virtual address. As a result, commands that use uvtop conversion such as "ps -a", "gcore" fail as readmem() for a uvaddr returns a seek error: ps: cannot access user stack address: <address> (k-hagio-ab(a)nec.com) - Handle 1GB block for VM_L3_4K on arm64 architecture. Without the patch, "vtop" command cannot display the block as a 1GB hugepage. (johan.erlandsson(a)sony.com) - Implement initial support for the MIP64 architecture. (tangyouling(a)loongson.cn, chenhuacai(a)loongson.cn) - Fix for HZ calculation using cfq_slice_async on Linux 4.8 and later kernels that contain commit 9a7f38c42c2b ("cfq-iosched: Convert from jiffies to nanoseconds"). Without the patch, the HZ calculation results in a wrong and big value for machde->hz and crash can shows a wrong uptime and timestamps in "log -T". (martin.moore(a)hpe.com) - Fix for HZ calculation on Linux 4.8 and later kernels that contain commit 9a7f38c42c2b ("cfq-iosched: Convert from jiffies to nanoseconds"). Without the patch, the HZ value can be set to a hardcorded wrong value. (k-hagio-ab(a)nec.com)