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authorColin Walters <walters@verbum.org>2013-04-24 18:19:04 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2013-04-25 22:51:31 -0400
commit910003d022ed299b50ab36228732bb74a23d46ba (patch)
treeffe1a8d0850a215e8610666c9687eadea9b2ffcd /src
parent45df1f2c9a7fee67b37f64ddd00adad5982844fa (diff)
coredump: use realloc() loop instead of malloc(768M)
I typically run VMs with 1024MiB allocated; systemd is unable to write coredumps in this scenario at all because the default kernel configuration will only overcommit 50% of available RAM. Avoid this failure by using a realloc() loop. See: http://lists.freedesktop.org/archives/systemd-devel/2013-April/010709.html
Diffstat (limited to 'src')
-rw-r--r--src/journal/coredump.c37
1 files changed, 26 insertions, 11 deletions
diff --git a/src/journal/coredump.c b/src/journal/coredump.c
index 2be6d94c22..fd03e389bb 100644
--- a/src/journal/coredump.c
+++ b/src/journal/coredump.c
@@ -37,6 +37,8 @@
#include "special.h"
#include "cgroup-util.h"
+/* Few programs have less than 3MiB resident */
+#define COREDUMP_MIN_START (3*1024*1024)
/* Make sure to not make this larger than the maximum journal entry
* size. See ENTRY_SIZE_MAX in journald-native.c. */
#define COREDUMP_MAX (768*1024*1024)
@@ -103,9 +105,10 @@ int main(int argc, char* argv[]) {
uid_t uid;
gid_t gid;
struct iovec iovec[14];
+ size_t coredump_bufsize, coredump_size;
_cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
*core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
- *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *p = NULL;
+ *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL;
prctl(PR_SET_DUMPABLE, 0);
@@ -234,23 +237,35 @@ int main(int argc, char* argv[]) {
goto finish;
}
- p = malloc(9 + COREDUMP_MAX);
- if (!p) {
+ coredump_bufsize = COREDUMP_MIN_START;
+ coredump_data = malloc(coredump_bufsize);
+ if (!coredump_data) {
r = log_oom();
goto finish;
}
- memcpy(p, "COREDUMP=", 9);
+ memcpy(coredump_data, "COREDUMP=", 9);
+ coredump_size = 9;
- n = loop_read(STDIN_FILENO, p + 9, COREDUMP_MAX, false);
- if (n < 0) {
- log_error("Failed to read core dump data: %s", strerror(-n));
- r = (int) n;
- goto finish;
+ for (;;) {
+ n = loop_read(STDIN_FILENO, coredump_data + coredump_size,
+ coredump_bufsize - coredump_size, false);
+ if (n < 0) {
+ log_error("Failed to read core dump data: %s", strerror(-n));
+ r = (int) n;
+ goto finish;
+ } else if (n == 0)
+ break;
+
+ coredump_size += n;
+ if (!GREEDY_REALLOC(coredump_data, coredump_bufsize, coredump_size + 1)) {
+ r = log_oom();
+ goto finish;
+ }
}
- iovec[j].iov_base = p;
- iovec[j].iov_len = 9 + n;
+ iovec[j].iov_base = coredump_data;
+ iovec[j].iov_len = coredump_size;
j++;
r = sd_journal_sendv(iovec, j);