From 8a877e9146d24b21ded98fdc0cbbca9cced83e5d Mon Sep 17 00:00:00 2001 From: HATAYAMA Daisuke Date: Fri, 25 Dec 2020 15:48:47 +0900 Subject: [PATCH 06/11] diskdump, zram: Notify necessity of loading zram module By the previous commit, trying to read swapped-out-into-zram-disk pages results in inaccessible memory error that is apparently irrelevant to zram and users cannot find it necessary to load zram module. Thus, let's add a warning message to indicate that as follows: crash> rd -u 0x7f520626e000 WARNING: Some pages are swapped out to zram. Please run mod -s zram. rd: invalid user virtual address: 7f520626e000 type: "64-bit UVADDR" Signed-off-by: HATAYAMA Daisuke --- diskdump.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/diskdump.c b/diskdump.c index 2b80e4a96ce4..30cb73fe2e19 100644 --- a/diskdump.c +++ b/diskdump.c @@ -2755,8 +2755,12 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong if (INVALID_MEMBER(zram_compressor)) { zram_init(); - if (INVALID_MEMBER(zram_compressor)) + if (INVALID_MEMBER(zram_compressor)) { + error(WARNING, + "Some pages are swapped out to zram. " + "Please run mod -s zram.\n"); return 0; + } } if (CRASHDEBUG(2)) -- 2.29.2