xinlongchen
bc171ac92e
If sources are already pending, sd_event_prepare() calls sd_event_wait(e, 0). Sincefd69f22475this returns 0 when a ratelimit expiry callback was invoked, so that sources re-enabled by the callback are evaluated in the next iteration. However, sd_event_prepare() then returned 0 ("nothing pending"), so sd_event_run() blocked in epoll_wait() forever, as the pending sources never make the epoll fd readable. PID 1 can hit this via the ratelimited mount event source, which hangs the boot, e.g. in the initrd after sysroot.mount. Fix this by remembering in the sd_event object that a ratelimit expiry callback was invoked in this iteration. In that case sd_event_wait() reports the loop as pending, and sd_event_dispatch() returns right away without dispatching anything, so that the caller goes directly for sd_event_prepare() again, and no other callback is dispatched in the same iteration. Add a test that reproduces the issue. Follow-up forfd69f22475. Fixes #44107 (cherry picked from commit 1a60b10de9e4a3fe59a2efa3c6a58fd72c305807)
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