diff options
Diffstat (limited to 'meta-oe/recipes-kernel/minicoredumper/files/0001-minicoredumper-retry-elf-parsing-as-long-as-needed.patch')
| -rw-r--r-- | meta-oe/recipes-kernel/minicoredumper/files/0001-minicoredumper-retry-elf-parsing-as-long-as-needed.patch | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/meta-oe/recipes-kernel/minicoredumper/files/0001-minicoredumper-retry-elf-parsing-as-long-as-needed.patch b/meta-oe/recipes-kernel/minicoredumper/files/0001-minicoredumper-retry-elf-parsing-as-long-as-needed.patch new file mode 100644 index 0000000000..8d5b8b6cbb --- /dev/null +++ b/meta-oe/recipes-kernel/minicoredumper/files/0001-minicoredumper-retry-elf-parsing-as-long-as-needed.patch @@ -0,0 +1,128 @@ +From 7a8c6a06c86e133e4346b1dc66483bd8d0d3c716 Mon Sep 17 00:00:00 2001 +From: John Ogness <john.ogness@linutronix.de> +Date: Tue, 24 Aug 2021 21:10:43 +0200 +Subject: [PATCH] minicoredumper: retry elf parsing as long as needed + +As was reported in github issue #2 ("maximum number of tries +insufficient, in rare cases, for elf parse"), the number of retries +for parsing a process may be insufficient. Rather than setting an +upper limit on the maximum number of retries, track the number of +headers seen. As long as the number of seen headers is greater than +the previous try, try again. + +In order to avoid introducing any new issues, preserve the behavior +of retrying at least 10 times, even if no new headers are seen. + +Reported-by: github.com/ssajal-wr +Signed-off-by: John Ogness <john.ogness@linutronix.de> + +Upstream-Status: Backport [7a8c6a06c86e133e4346b1dc66483bd8d0d3c716] + +Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com> +--- + src/minicoredumper/corestripper.c | 30 +++++++++++++++++++++++------- + 1 file changed, 23 insertions(+), 7 deletions(-) + +diff --git a/src/minicoredumper/corestripper.c b/src/minicoredumper/corestripper.c +index d96d1df..c96b350 100644 +--- a/src/minicoredumper/corestripper.c ++++ b/src/minicoredumper/corestripper.c +@@ -761,7 +761,7 @@ static int init_log(struct dump_info *di) + typedef int elf_parse_cb(struct dump_info *di, Elf *elf, GElf_Phdr *phdr); + + static int do_elf_ph_parse(struct dump_info *di, GElf_Phdr *type, +- elf_parse_cb *callback) ++ elf_parse_cb *callback, size_t *phnum_found) + { + GElf_Ehdr ehdr_mem; + GElf_Ehdr *ehdr; +@@ -770,6 +770,9 @@ static int do_elf_ph_parse(struct dump_info *di, GElf_Phdr *type, + size_t phnum; + size_t cnt; + ++ if (phnum_found) ++ *phnum_found = 0; ++ + /* start from beginning of core */ + if (lseek64(di->elf_fd, 0, SEEK_SET) == -1) { + info("lseek failed: %s", strerror(errno)); +@@ -809,6 +812,9 @@ static int do_elf_ph_parse(struct dump_info *di, GElf_Phdr *type, + goto out; + } + ++ if (phnum_found) ++ *phnum_found = phnum; ++ + for (cnt = 0; cnt < phnum; cnt++) { + GElf_Phdr phdr_mem; + GElf_Phdr *phdr; +@@ -891,7 +897,7 @@ static int vma_cb(struct dump_info *di, Elf *elf, GElf_Phdr *phdr) + /* + * Tries to parse the found ELF headers and reads all vmas from it. + */ +-static int parse_vma_info(struct dump_info *di) ++static int parse_vma_info(struct dump_info *di, size_t *phnum_found) + { + unsigned long min_off = ULONG_MAX; + unsigned long max_len = 0; +@@ -911,7 +917,7 @@ static int parse_vma_info(struct dump_info *di) + memset(&type, 0, sizeof(type)); + type.p_type = PT_LOAD; + type.p_flags = PF_R; +- if (do_elf_ph_parse(di, &type, vma_cb) != 0) ++ if (do_elf_ph_parse(di, &type, vma_cb, phnum_found) != 0) + return -1; + + for (v = di->vma; v; v = v->next) { +@@ -1614,8 +1620,10 @@ int add_core_data(struct dump_info *di, off64_t dest_offset, size_t len, + */ + static int init_src_core(struct dump_info *di, int src) + { ++ size_t last_phnum = 0; + int tries = 0; + int ret = -1; ++ size_t phnum; + size_t len; + char *buf; + long pos; +@@ -1642,7 +1650,7 @@ again: + goto out; + + /* try to elf-parse the core to read vma info */ +- ret = parse_vma_info(di); ++ ret = parse_vma_info(di, &phnum); + + /* restore our position */ + if (lseek64(di->elf_fd, pos, SEEK_SET) == -1) +@@ -1653,9 +1661,17 @@ again: + + tries++; + +- /* maybe try again */ +- if (tries < 10) ++ if (phnum > last_phnum) { ++ /* new headers found, keep trying */ ++ last_phnum = phnum; + goto again; ++ } else if (tries < 10) { ++ /* ++ * even if no new headers are found, ++ * retry at least 10 times ++ */ ++ goto again; ++ } + + goto out; + } +@@ -2106,7 +2122,7 @@ static int dump_stacks(struct dump_info *di) + /* find and set the first task */ + memset(&type, 0, sizeof(type)); + type.p_type = PT_NOTE; +- do_elf_ph_parse(di, &type, note_cb); ++ do_elf_ph_parse(di, &type, note_cb, NULL); + } + + if (di->first_pid) +-- +2.25.1 + |