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Fix assertion failure and segmentation fault in backup code.

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When a non-exclusive backup is canceled, do_pg_abort_backup() is called
and resets some variables set by pg_backup_start (pg_start_backup in v14
or before). But previously it forgot to reset the session state indicating
whether a non-exclusive backup is in progress or not in this session.

This issue could cause an assertion failure when the session running
BASE_BACKUP is terminated after it executed pg_backup_start and
pg_backup_stop (pg_stop_backup in v14 or before). Also it could cause
a segmentation fault when pg_backup_stop is called after BASE_BACKUP
in the same session is canceled.

This commit fixes the issue by making do_pg_abort_backup reset
that session state.

Back-patch to all supported branches.

Author: Fujii Masao
Reviewed-by: Kyotaro Horiguchi, Masahiko Sawada, Michael Paquier, Robert Haas
Discussion: https://postgr.es/m/3374718f-9fbf-a950-6d66-d973e027f44c@oss.nttdata.com
This commit is contained in:
Fujii Masao 2022-07-12 11:53:29 +09:00
parent 286793b988
commit 0829cc43ed
1 changed files with 2 additions and 0 deletions
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2
src/backend/access/transam/xlog.c
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@ -8783,6 +8783,8 @@ do_pg_abort_backup(int code, Datum arg)
{
XLogCtl->Insert.forcePageWrites = false;
}
sessionBackupState = SESSION_BACKUP_NONE;
WALInsertLockRelease();
if (emit_warning)