September 2025 - Crash-utility - Crash Utility List Archives

[PATCH] Optimize extensions's compiler from gcc to $(CC)

by 高建云

Change the default compiler of the extensions from the fixed gcc to $(CC) passed in by the upper layer Makefile, to facilitate cross_compile. Signed-off-by: jianyun.gao <jianyungao89(a)gmail.com> --- Makefile | 2 +- extensions/Makefile | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/Makefile b/Makefile index b277129..58b1326 100644 --- a/Makefile +++ b/Makefile @@ -727,7 +727,7 @@ extensions: make_configure @$(MAKE) do_extensions do_extensions: - @$(MAKE) -C extensions -i TARGET=$(TARGET) TARGET_CFLAGS="$(CFLAGS) $(TARGET_CFLAGS)" GDB=$(GDB) GDB_FLAGS=$(GDB_FLAGS) + @$(MAKE) -C extensions -i CC=$(CC) TARGET=$(TARGET) TARGET_CFLAGS="$(CFLAGS) $(TARGET_CFLAGS)" GDB=$(GDB) GDB_FLAGS=$(GDB_FLAGS) memory_driver: make_configure @$(MAKE) -C memory_driver -i diff --git a/extensions/Makefile b/extensions/Makefile index e4c68c3..67d3839 100644 --- a/extensions/Makefile +++ b/extensions/Makefile @@ -23,7 +23,7 @@ # suffice, create a .mk file with the same prefix as the .c file, # and that makefile will be invoked. # - +CC ?= gcc CONTRIB_SO := $(patsubst %.c,%.so,$(wildcard *.c)) all: link_defs $(CONTRIB_SO) @@ -37,11 +37,11 @@ $(CONTRIB_SO): %.so: %.c defs.h $(MAKE) -f $*.mk; \ else \ grep -q '((constructor))' $*.c && { \ - echo "gcc -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ - gcc -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ + echo "$(CC) -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ + $(CC) -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ } || { \ - echo "gcc -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ - gcc -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ + echo "$(CC) -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ + $(CC) -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ }; \ fi -- 2.34.1

1 day, 9 hours

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Patch for Optimize extensions's compilation

by jianyungao89＠gmail.com

1 day, 11 hours

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by timothyl.barnett1＠gmail.com

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1 day, 14 hours

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[PATCH] Fix get_pathname() not handling stacked mounts

by Aureau, Georges (Kernel Tools ERT)

[PATCH] Fix get_pathname() not handling stacked mounts This get_pathname() issue can be duplicated as follow: sudo mkdir -p /tmp/test sudo mount -t tmpfs tmpfs /tmp/test sudo mount --make-private /tmp/test sudo mount --bind /tmp/test /tmp/test sudo mount --bind /tmp/test /tmp/test sudo mount -o remount,ro /tmp/test $ sudo crash /usr/lib/debug/boot/vmlinux-$(uname -r) crash> mount | grep /tmp/test ffff9648e7febc00 ffff9648d91ac800 tmpfs tmpfs /tmp/test ffff9648c9281380 ffff9648d91ac800 tmpfs tmpfs /tmp/test/ ffff9648c8e9a700 ffff9648d91ac800 tmpfs tmpfs / The last mount is not printed properly, and this is impacting diagnostic when looking at vmcore from complex containers mount environments. Signed-off-by: Georges Aureau <georges.aureau(a)hpe.com> -- diff --git a/filesys.c b/filesys.c index 8d13807..af6d616 100644 --- a/filesys.c +++ b/filesys.c @@ -3140,6 +3154,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) tmp_vfsmnt = vfsmnt; do { + more_vfsmnt: tmp_dentry = parent; dentry_buf = fill_dentry_cache(tmp_dentry); @@ -3195,6 +3210,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) break; else tmp_vfsmnt = mnt_parent; + goto more_vfsmnt; } } else if (VALID_STRUCT(mount)) { if (tmp_vfsmnt) { @@ -3213,6 +3229,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) break; else tmp_vfsmnt = mnt_parent + OFFSET(mount_mnt); + goto more_vfsmnt; } } else { @@ -3222,6 +3239,9 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) } } while (tmp_dentry != parent && parent); + if (!STREQ(pathname, "/") && LASTCHAR(pathname) == '/') { + LASTCHAR(pathname) = '\0'; + } if (mnt_buf) FREEBUF(mnt_buf);

1 day, 15 hours

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by christinejohn999＠gmail.com

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4 days, 10 hours

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by christinejohn999＠gmail.com

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4 days, 10 hours

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4 days, 10 hours

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Patch for Optimize extensions's compilation

by 高建云

Hello, When I tried to build crash extensions for arm64, I found that the default compiler is fixed with gcc. I try to optimize it ,so I send this patch. Looking forward to hearing from you. Best wishes,Thank u

6 days, 8 hours

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[PATCH v2] vmcoreinfo: read vmcoreinfo using 'vmcoreinfo_data' when unavailable in elf note

by Aditya Gupta

Few vmcores don't have vmcoreinfo elf note, such as those created using virsh-dump. On architectures such as PowerPC64, vmcoreinfo is mandatory to fetch the first_vmalloc_address, for vmcores of upstream linux, since crash-utility commit: commit 5b24e363a898 ("get vmalloc start address from vmcoreinfo") Try reading from the 'vmcoreinfo_data' symbol instead, if the vmcoreinfo crash tries to read in case of diskdump/netdump is empty/missing. The approach to read 'vmcoreinfo_data' was used for a live kernel, which can be reused in the case of missing vmcoreinfo note also, as the 'vmcoreinfo_data' symbol is available with vmcore too Note though, till GDB interface is not initialised, reading from vmcoreinfo_data symbol is not done, so behaviour is same as previously with no vmcoreinfo (only till GDB interface is not initialised) Hence rename 'vmcoreinfo_read_string' in kernel.c to 'vmcoreinfo_read_from_memory', and use it in netdump.c and diskdump.c too. Reported-by: Anushree Mathur <anushree.mathur(a)linux.ibm.com> Tested-by: Anushree Mathur <anushree.mathur(a)linux.ibm.com> Signed-off-by: Aditya Gupta <adityag(a)linux.ibm.com> --- Changelog ========= v2: + rename 'is_vmcoreinfo_empty' to netdump/diskdump variants in netdump.c and diskdump.c respectively --- --- defs.h | 1 + diskdump.c | 18 ++++++++++++++++++ kernel.c | 17 ++++++++++++----- netdump.c | 19 +++++++++++++++++++ 4 files changed, 50 insertions(+), 5 deletions(-) diff --git a/defs.h b/defs.h index 156ac0232906..d28484ec44f9 100644 --- a/defs.h +++ b/defs.h @@ -6218,6 +6218,7 @@ void dump_kernel_table(int); void dump_bt_info(struct bt_info *, char *where); void dump_log(int); void parse_kernel_version(char *); +char *vmcoreinfo_read_from_memory(const char *); #define LOG_LEVEL(v) ((v) & 0x07) #define SHOW_LOG_LEVEL (0x1) diff --git a/diskdump.c b/diskdump.c index ce3cbb7b12dd..de907551153d 100644 --- a/diskdump.c +++ b/diskdump.c @@ -1041,6 +1041,13 @@ pfn_to_pos(ulong pfn) return desc_pos; } +/** + * Check if vmcoreinfo in vmcore is missing/empty + */ +static bool is_diskdump_vmcoreinfo_empty(void) +{ + return (dd->sub_header_kdump->size_vmcoreinfo == 0); +} /* * Determine whether a file is a diskdump creation, and if TRUE, @@ -1088,6 +1095,17 @@ is_diskdump(char *file) pc->read_vmcoreinfo = vmcoreinfo_read_string; + /* + * vmcoreinfo can be empty in case of dump collected via virsh-dump + * + * check if vmcoreinfo is not available in vmcore, and try to read + * the vmcoreinfo from memory, using "vmcoreinfo_data" symbol + */ + if (is_diskdump_vmcoreinfo_empty()) { + error(WARNING, "vmcoreinfo is empty, will read from symbols\n"); + pc->read_vmcoreinfo = vmcoreinfo_read_from_memory; + } + if ((pc->flags2 & GET_LOG) && KDUMP_CMPRS_VALID()) { pc->dfd = dd->dfd; pc->readmem = read_diskdump; diff --git a/kernel.c b/kernel.c index e4213d7a663e..0e17874c503c 100644 --- a/kernel.c +++ b/kernel.c @@ -99,7 +99,6 @@ static ulong dump_audit_skb_queue(ulong); static ulong __dump_audit(char *); static void dump_audit(void); static void dump_printk_safe_seq_buf(int); -static char *vmcoreinfo_read_string(const char *); static void check_vmcoreinfo(void); static int is_pvops_xen(void); static int get_linux_banner_from_vmlinux(char *, size_t); @@ -11892,8 +11891,8 @@ dump_printk_safe_seq_buf(int msg_flags) * Returns a string (that has to be freed by the caller) that contains the * value for key or NULL if the key has not been found. */ -static char * -vmcoreinfo_read_string(const char *key) +char * +vmcoreinfo_read_from_memory(const char *key) { char *buf, *value_string, *p1, *p2; size_t value_length; @@ -11903,6 +11902,14 @@ vmcoreinfo_read_string(const char *key) buf = value_string = NULL; + if (!(pc->flags & GDB_INIT)) { + /* + * GDB interface hasn't been initialised yet, so can't + * access vmcoreinfo_data + */ + return NULL; + } + switch (get_symbol_type("vmcoreinfo_data", NULL, NULL)) { case TYPE_CODE_PTR: @@ -11958,10 +11965,10 @@ check_vmcoreinfo(void) switch (get_symbol_type("vmcoreinfo_data", NULL, NULL)) { case TYPE_CODE_PTR: - pc->read_vmcoreinfo = vmcoreinfo_read_string; + pc->read_vmcoreinfo = vmcoreinfo_read_from_memory; break; case TYPE_CODE_ARRAY: - pc->read_vmcoreinfo = vmcoreinfo_read_string; + pc->read_vmcoreinfo = vmcoreinfo_read_from_memory; break; } } diff --git a/netdump.c b/netdump.c index c7ff009e7f90..69100a92e067 100644 --- a/netdump.c +++ b/netdump.c @@ -111,6 +111,14 @@ map_cpus_to_prstatus(void) FREEBUF(nt_ptr); } +/** + * Check if vmcoreinfo in vmcore is missing/empty + */ +static bool is_netdump_vmcoreinfo_empty(void) +{ + return (nd->size_vmcoreinfo == 0); +} + /* * Determine whether a file is a netdump/diskdump/kdump creation, * and if TRUE, initialize the vmcore_data structure. @@ -464,6 +472,17 @@ is_netdump(char *file, ulong source_query) pc->read_vmcoreinfo = vmcoreinfo_read_string; + /* + * vmcoreinfo can be empty in case of dump collected via virsh-dump + * + * check if vmcoreinfo is not available in vmcore, and try to read + * the vmcoreinfo from memory, using "vmcoreinfo_data" symbol + */ + if (is_netdump_vmcoreinfo_empty()) { + error(WARNING, "vmcoreinfo is empty, will read from symbols\n"); + pc->read_vmcoreinfo = vmcoreinfo_read_from_memory; + } + if ((source_query == KDUMP_LOCAL) && (pc->flags2 & GET_OSRELEASE)) kdump_get_osrelease(); -- 2.50.1

6 days, 10 hours

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[PATCH v2] Add "log -R" to display human readable Rust symbol name

by Lianbo Jiang

Currently, the log command will display human readable Rust symbol name by default if any, but, sometimes still want to print the original messages from the log buffer(do not demangle). In addition, if the log buffer has lines like "_R ... +" which are not Rust symbols unexpectedly, probably the output will be missed, that is unexpected. To fix above cases, add "log -R" to display human readable Rust symbol name, otherwise still print the original messages. With the patch: crash> log -R ... [ 2174.289360] Tainted: [S]=CPU_OUT_OF_SPEC, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE [ 2174.297322] Hardware name: Intel Corporation S2600CWR/S2600CWR, BIOS SE5C610.86B.01.01.0018.072020161249 07/20/2016 [ 2174.308966] Call Trace: [ 2174.311693] <TASK> [ 2174.314033] dump_stack_lvl+0x5d/0x80 [ 2174.318125] panic+0x156/0x32a [ 2174.321539] rust_panic::area_in_hp+0xf7/0x120 [rust_panic] [ 2174.329700] ? console_unlock+0x9c/0x140 [ 2174.334080] ? irq_work_queue+0x2d/0x50 [ 2174.338352] ? __pfx_init_module+0x10/0x10 [rust_panic] [ 2174.344183] <rust_panic::HelloPanic>::step_two+0x20/0xe0 [rust_panic] [ 2174.353698] ? _printk+0x6b/0x90 [ 2174.357303] init_module+0x57/0xff0 [rust_panic] [ 2174.362456] ? __pfx_init_module+0x10/0x10 [rust_panic] ... Suggested-by: Kazuhito Hagio <k-hagio-ab(a)nec.com> Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com> --- defs.h | 1 + help.c | 24 +++++++++++++++++++++++- kernel.c | 5 ++++- printk.c | 53 +++++++++++++++++++++++++++++------------------------ 4 files changed, 57 insertions(+), 26 deletions(-) diff --git a/defs.h b/defs.h index 156ac0232906..997145cba9d2 100644 --- a/defs.h +++ b/defs.h @@ -6227,6 +6227,7 @@ void parse_kernel_version(char *); #define SHOW_LOG_CTIME (0x10) #define SHOW_LOG_SAFE (0x20) #define SHOW_LOG_CALLER (0x40) +#define SHOW_LOG_RUST (0x80) void set_cpu(int); void clear_machdep_cache(void); struct stack_hook *gather_text_list(struct bt_info *); diff --git a/help.c b/help.c index 4f071e0bd0a0..78d7a5c70e30 100644 --- a/help.c +++ b/help.c @@ -4026,7 +4026,7 @@ NULL char *help_log[] = { "log", "dump system message buffer", -"[-Ttdmasc]", +"[-TtdmascR]", " This command dumps the kernel log_buf contents in chronological order. The", " command supports the older log_buf formats, which may or may not contain a", " timestamp inserted prior to each message, as well as the newer variable-length", @@ -4053,6 +4053,8 @@ char *help_log[] = { " the CPU id (if in CPU context) that called printk(), if available.", " Generally available on Linux 5.1 to 5.9 kernels configured with", " CONFIG_PRINTK_CALLER or Linux 5.10 and later kernels.", +" -R Display the message text with human readable Rust symbol name if any,", +" otherwise still print the original message text.", " ", "\nEXAMPLES", " Dump the kernel message buffer:\n", @@ -4231,6 +4233,26 @@ char *help_log[] = { " [ 0.014179] [ T29] RAMDISK: [mem 0x3cf4f000-0x437bbfff]", " [ 0.198789] [ C0] DMAR: DRHD: handling fault status reg 3", " ...", +" ", +" Display the message text with human readable Rust symbol name if any,", +" otherwise still print the original message text.\n", +" %s> log -R", +" ...", +" [ 2174.289360] Tainted: [S]=CPU_OUT_OF_SPEC, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE", +" [ 2174.297322] Hardware name: Intel Corporation S2600CWR/S2600CWR, BIOS SE5C610.86B.01.01.0018.072020161249 07/20/2016", +" [ 2174.308966] Call Trace:", +" [ 2174.311693] <TASK>", +" [ 2174.314033] dump_stack_lvl+0x5d/0x80", +" [ 2174.318125] panic+0x156/0x32a", +" [ 2174.321539] rust_panic::area_in_hp+0xf7/0x120 [rust_panic]", +" [ 2174.329700] ? console_unlock+0x9c/0x140", +" [ 2174.334080] ? irq_work_queue+0x2d/0x50", +" [ 2174.338352] ? __pfx_init_module+0x10/0x10 [rust_panic]", +" [ 2174.344183] <rust_panic::HelloPanic>::step_two+0x20/0xe0 [rust_panic]", +" [ 2174.353698] ? _printk+0x6b/0x90", +" [ 2174.357303] init_module+0x57/0xff0 [rust_panic]", +" [ 2174.362456] ? __pfx_init_module+0x10/0x10 [rust_panic]", +" ...", NULL }; diff --git a/kernel.c b/kernel.c index e4213d7a663e..e077275d7ed6 100644 --- a/kernel.c +++ b/kernel.c @@ -5136,7 +5136,7 @@ cmd_log(void) msg_flags = 0; - while ((c = getopt(argcnt, args, "Ttdmasc")) != EOF) { + while ((c = getopt(argcnt, args, "TtdmascR")) != EOF) { switch(c) { case 'T': @@ -5160,6 +5160,9 @@ cmd_log(void) case 'c': msg_flags |= SHOW_LOG_CALLER; break; + case 'R': + msg_flags |= SHOW_LOG_RUST; + break; default: argerrs++; break; diff --git a/printk.c b/printk.c index 51b618e2a434..b8fcc8e58160 100644 --- a/printk.c +++ b/printk.c @@ -202,7 +202,7 @@ dump_record(struct prb_map *m, unsigned long id, int msg_flags) text = m->text_data + begin; - if (text_len > BUFSIZE) { + if ((msg_flags & SHOW_LOG_RUST) && (text_len > BUFSIZE)) { error(WARNING, "\nThe messages could be truncated!\n"); text_len = BUFSIZE; } @@ -210,36 +210,41 @@ dump_record(struct prb_map *m, unsigned long id, int msg_flags) for (i = 0, p = text; i < text_len; i++, p++) { if (*p == '\n') fprintf(fp, "\n%s", space(ilen)); - else if (isprint(*p) || isspace(*p)) + else if ((msg_flags & SHOW_LOG_RUST) && (isprint(*p) || isspace(*p))) sprintf(&buf[i], "%c", *p); + else if (isprint(*p) || isspace(*p)) + fputc(*p, fp); else fputc('.', fp); } /* * Try to demangle a mangled Rust symbol(calltrace) from log buffer */ - char *p1 = strstr(buf, "_R"); - if (!p1) - p1 = strstr(buf, "_ZN"); - char *p2 = strrchr(buf, '+'); - if (p1 && p2) { - char mangled[BUFSIZE] = {0}; - char demangled[BUFSIZE] = {0}; - char *res; - size_t slen = p1 - buf; - - if (slen) - memcpy(demangled, buf, slen); - - memcpy(mangled, p1, p2-p1); - res = rust_demangle(mangled, DMGL_RUST); - if (res) { - snprintf(demangled+slen, BUFSIZE-slen, "%s%s", res, p2); - fprintf(fp, "%s",demangled); - free(res); - } - } else - fprintf(fp, "%s", buf); + if (msg_flags & SHOW_LOG_RUST) { + char *p1 = strstr(buf, "_R"); + if (!p1) + p1 = strstr(buf, "_ZN"); + char *p2 = strrchr(buf, '+'); + if (p1 && p2) { + char mangled[BUFSIZE] = {0}; + char demangled[BUFSIZE] = {0}; + char *res; + size_t slen = p1 - buf; + + if (slen) + memcpy(demangled, buf, slen); + + memcpy(mangled, p1, p2-p1); + res = rust_demangle(mangled, DMGL_RUST); + if (res) { + snprintf(demangled+slen, BUFSIZE-slen, "%s%s", res, p2); + fprintf(fp, "%s",demangled); + free(res); + } else + fprintf(fp, "%s", buf); + } else + fprintf(fp, "%s", buf); + } if (msg_flags & SHOW_LOG_DICT) { text = info + OFFSET(printk_info_dev_info) + -- 2.50.1

6 days, 20 hours

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Crash-utility September 2025