mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix integer underflow in shared memory debugging

Browse Source 
dsa_dump would print a large negative number instead of zero for
segment bin 0.  Fix by explicitly checking for underflow and add
special case for bin 0. Backpatch to all supported versions.

Author: Ian Ilyasov <ianilyasov@outlook.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/GV1P251MB1004E0D09D117D3CECF9256ECD502@GV1P251MB1004.EURP251.PROD.OUTLOOK.COM
Backpatch-through: v12
This commit is contained in:
Daniel Gustafsson 2024-02-29 12:19:52 +01:00
parent 43cca9de9a
commit d5c3d6ca01
1 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/backend/utils/mmgr/dsa.c
View File

@ -1093,6 +1093,10 @@ dsa_dump(dsa_area *area)
{ {
dsa_segment_index segment_index; dsa_segment_index segment_index;
if (i == 0)
fprintf(stderr,
" segment bin %zu (no contiguous free pages):\n", i);
else
fprintf(stderr, fprintf(stderr,
" segment bin %zu (at least %d contiguous pages free):\n", " segment bin %zu (at least %d contiguous pages free):\n",
i, 1 << (i - 1)); i, 1 << (i - 1));