If kthread_run() fails, pgdat->kswapd contains errno. When we stop this thread, we only check whether pgdat->kswapd is NULL and access it. If it contains errno, it will cause page fault. Reset pgdat->kswapd to NULL when creating kernel thread fails can avoid this problem.
Signed-off-by: Wen Congyang <[email protected]> --- mm/vmscan.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 347b3ff..1e8e2aa 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2953,6 +2953,7 @@ int kswapd_run(int nid) /* failure at boot is fatal */ BUG_ON(system_state == SYSTEM_BOOTING); printk("Failed to start kswapd on node %d\n",nid); + pgdat->kswapd = NULL; ret = -1; } return ret; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
