[PATCH] coredump: add cond_resched() to dump_user_range

[Rik van Riel]

The loop between elf_core_dump() and dump_user_range() can run for
so long that the system shows softlockup messages, with side effects
like workqueues and RCU getting stuck on the core dumping CPU.

Add a cond_resched() in dump_user_range() to avoid that softlockup.

Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
---
 fs/coredump.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/coredump.c b/fs/coredump.c
index 53a78b6bbb5b..14c385ffbcc9 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -1020,6 +1020,7 @@ int dump_user_range(struct coredump_params *cprm, unsigned long start,
 		} else {
 			dump_skip(cprm, PAGE_SIZE);
 		}
+		cond_resched();
 	}
 	dump_page_free(dump_page);
 	return 1;
-- 
2.45.2