A corrupt page table hands the same bogus entry to get_swap_device() on every access to the mapping, and every rejection is logged. One machine logged 6185620 copies of the same line in a few hours. swap_dup_entry_direct() prints the same message from the fork path, once per call: the WARN_ON_ONCE() guarding it warns once, the pr_err() inside does not. Rate limit all three prints. Cc: stable@vger.kernel.org Fixes: 23b230ba8ac3 ("mm/swap: print bad swap offset entry in get_swap_device") Reviewed-by: Barry Song Reviewed-by: Nhat Pham Acked-by: Kairui Song Signed-off-by: Breno Leitao --- mm/swapfile.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index dacef34a3ed7a..53bf01d5f7f11 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1899,11 +1899,11 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry) return si; bad_nofile: - pr_err("%s: %s%08lx\n", __func__, Bad_file, entry.val); + pr_err_ratelimited("%s: %s%08lx\n", __func__, Bad_file, entry.val); out: return NULL; put_out: - pr_err("%s: %s%08lx\n", __func__, Bad_offset, entry.val); + pr_err_ratelimited("%s: %s%08lx\n", __func__, Bad_offset, entry.val); percpu_ref_put(&si->users); return NULL; } @@ -3883,7 +3883,7 @@ int swap_dup_entry_direct(swp_entry_t entry) si = swap_entry_to_info(entry); if (WARN_ON_ONCE(!si)) { - pr_err("%s%08lx\n", Bad_file, entry.val); + pr_err_ratelimited("%s%08lx\n", Bad_file, entry.val); return -EINVAL; } --- base-commit: e6664f2b33db9b6811eb4cec109f06cb2b4f458d change-id: 20260818-swap_part_one-1ad0fe65809e Best regards, -- Breno Leitao