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Fix dbgmsg printing in ztest and zdb

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This patch resolves a problem where the -G option in both zdb and
ztest would cause the code to call __dprintf() to print zfs_dbgmsg
output. This function was not properly wired to add messages to the
dbgmsg log as it is in userspace and so the messages were simply
dropped. This patch also tries to add some degree of distinction to
dprintf() (which now prints directly to stdout) and zfs_dbgmsg()
(which adds messages to an internal list that can be dumped with
zfs_dbgmsg_print()).

In addition, this patch corrects an issue where ztest used a global
variable to decide whether to dump the dbgmsg buffer on a crash.
This did not work because ztest spins up more instances of itself
using execv(), which did not copy the global variable to the new
process. The option has been moved to the ztest_shared_opts_t
which already exists for interprocess communication.

This patch also changes zfs_dbgmsg_print() to use write() calls
instead of printf() so that it will not fail when used in a signal
handler.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #8010
This commit is contained in:
Tom Caputi
2018-10-15 15:14:22 -04:00
committed by Brian Behlendorf
parent c04812f964
commit ab4c009e3d
5 changed files with 82 additions and 26 deletions
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lib/libzpool/kernel.c
+30 -5
View File
@@ -783,7 +783,8 @@ dprintf_setup(int *argc, char **argv)
* =========================================================================
*/
void
__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
__dprintf(boolean_t dprint, const char *file, const char *func,
int line, const char *fmt, ...)
{
const char *newfile;
va_list adx;
@@ -798,9 +799,14 @@ __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
newfile = file;
}
if (dprintf_print_all ||
dprintf_find_string(newfile) ||
dprintf_find_string(func)) {
if (dprint) {
/* dprintf messages are printed immediately */
if (!dprintf_print_all &&
!dprintf_find_string(newfile) &&
!dprintf_find_string(func))
return;
/* Print out just the function name if requested */
flockfile(stdout);
if (dprintf_find_string("pid"))
@@ -813,11 +819,30 @@ __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
(void) printf("%llu ", gethrtime());
if (dprintf_find_string("long"))
(void) printf("%s, line %d: ", newfile, line);
(void) printf("%s: ", func);
(void) printf("dprintf: %s: ", func);
va_start(adx, fmt);
(void) vprintf(fmt, adx);
va_end(adx);
funlockfile(stdout);
} else {
/* zfs_dbgmsg is logged for dumping later */
size_t size;
char *buf;
int i;
size = 1024;
buf = umem_alloc(size, UMEM_NOFAIL);
i = snprintf(buf, size, "%s:%d:%s(): ", newfile, line, func);
if (i < size) {
va_start(adx, fmt);
(void) vsnprintf(buf + i, size - i, fmt, adx);
va_end(adx);
}
__zfs_dbgmsg(buf);
umem_free(buf, size);
}
}