From 99a9ff3961e3b4f33e391e09772a456330e7e109 Mon Sep 17 00:00:00 2001 From: Konstantin Khlebnikov Date: Wed, 4 Jun 2014 16:05:30 -0700 Subject: tools/vm/page-types.c: catch sigbus if raced with truncate commit 1d46598b7903cd5ec83c49adbd741f43bb0ffcdc upstream. Recently added page-cache dumping is known to be a little bit racy. But after race with truncate it just dies due to unhandled SIGBUS when it tries to poke pages beyond the new end of file. This patch adds handler for SIGBUS which skips the rest of the file. Signed-off-by: Konstantin Khlebnikov Cc: Naoya Horiguchi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- tools/vm/page-types.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) (limited to 'tools') diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c index 05654f5e48d..c4d6d2e20e0 100644 --- a/tools/vm/page-types.c +++ b/tools/vm/page-types.c @@ -32,6 +32,8 @@ #include #include #include +#include +#include #include #include #include @@ -824,21 +826,38 @@ static void show_file(const char *name, const struct stat *st) atime, now - st->st_atime); } +static sigjmp_buf sigbus_jmp; + +static void * volatile sigbus_addr; + +static void sigbus_handler(int sig, siginfo_t *info, void *ucontex) +{ + (void)sig; + (void)ucontex; + sigbus_addr = info ? info->si_addr : NULL; + siglongjmp(sigbus_jmp, 1); +} + +static struct sigaction sigbus_action = { + .sa_sigaction = sigbus_handler, + .sa_flags = SA_SIGINFO, +}; + static void walk_file(const char *name, const struct stat *st) { uint8_t vec[PAGEMAP_BATCH]; uint64_t buf[PAGEMAP_BATCH], flags; unsigned long nr_pages, pfn, i; + off_t off, end = st->st_size; int fd; - off_t off; ssize_t len; void *ptr; int first = 1; fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW); - for (off = 0; off < st->st_size; off += len) { - nr_pages = (st->st_size - off + page_size - 1) / page_size; + for (off = 0; off < end; off += len) { + nr_pages = (end - off + page_size - 1) / page_size; if (nr_pages > PAGEMAP_BATCH) nr_pages = PAGEMAP_BATCH; len = nr_pages * page_size; @@ -855,11 +874,19 @@ static void walk_file(const char *name, const struct stat *st) if (madvise(ptr, len, MADV_RANDOM)) fatal("madvice failed: %s", name); + if (sigsetjmp(sigbus_jmp, 1)) { + end = off + sigbus_addr ? sigbus_addr - ptr : 0; + fprintf(stderr, "got sigbus at offset %lld: %s\n", + (long long)end, name); + goto got_sigbus; + } + /* populate ptes */ for (i = 0; i < nr_pages ; i++) { if (vec[i] & 1) (void)*(volatile int *)(ptr + i * page_size); } +got_sigbus: /* turn off harvesting reference bits */ if (madvise(ptr, len, MADV_SEQUENTIAL)) @@ -910,6 +937,7 @@ static void walk_page_cache(void) kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY); + sigaction(SIGBUS, &sigbus_action, NULL); if (stat(opt_file, &st)) fatal("stat failed: %s\n", opt_file); @@ -925,6 +953,7 @@ static void walk_page_cache(void) close(kpageflags_fd); close(pagemap_fd); + signal(SIGBUS, SIG_DFL); } static void parse_file(const char *name) -- cgit v1.2.3-18-g5258