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util: warn if UTI_OpenFile() is stuck in a loop

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When UTI_OpenFile() is removing an existing file to be replaced by a new
file, it could potentially get stuck in an infinite loop if something
was able to consistently win the race and create a new file before
chronyd.

Log a warning message after 100 failed attempts and repeat on each 10x
increase to make it more obvious to the admin, if it ever happens.

Reported-by: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>
This commit is contained in:
Miroslav Lichvar
2025-07-02 15:34:03 +02:00
parent d30913e78c
commit 1d9e080749
1 changed files with 7 additions and 0 deletions
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7
util.c
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@@ -1364,6 +1364,7 @@ FILE *
UTI_OpenFile(const char *basedir, const char *name, const char *suffix,
char mode, mode_t perm)
{
uint64_t attempts = 0, warn_attempts = 100;
const char *file_mode;
char path[PATH_MAX];
LOG_Severity severity;
@@ -1407,6 +1408,12 @@ try_again:
return NULL;
}
DEBUG_LOG("Removed %s", path);
if (++attempts == warn_attempts) {
LOG(LOGS_WARN, "Failing to replace %s (%"PRIu64" attempts)", path, attempts);
warn_attempts *= 10;
}
goto try_again;
}
LOG(severity, "Could not open %s : %s", path, strerror(errno));