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https://github.com/isc-projects/bind9.git
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942b83d392
It follows a description of the steps that were leading to the deadlock:
1. `do_addzone` calls `isc_task_beginexclusive`.
2. `isc_task_beginexclusive` waits for (N_WORKERS - 1) halted tasks,
this blocks waiting for those (no. workers -1) workers to halt.
...
isc_task_beginexclusive(isc_task_t *task0) {
...
while (manager->halted + 1 < manager->workers) {
wake_all_queues(manager);
WAIT(&manager->halt_cond, &manager->halt_lock);
}
```
3. It is possible that in `task.c / dispatch()` a worker is running a
task event, if that event blocks it will not allow this worker to
halt.
4. `do_addzone` acquires `LOCK(&view->new_zone_lock);`,
5. `rmzone` event is called from some worker's `dispatch()`, `rmzone`
blocks waiting for the same lock.
6. `do_addzone` calls `isc_task_beginexclusive`.
7. Deadlock triggered, since:
- `rmzone` is wating for the lock.
- `isc_task_beginexclusive` is waiting for (no. workers - 1) to
be halted
- since `rmzone` event is blocked it won't allow the worker to halt.
To fix this, we updated do_addzone code to call isc_task_beginexclusive
before the lock is acquired, we postpone locking to the nearest required
place, same for isc_task_beginexclusive.
The same could happen with rndc modzone, so that was addressed as well.
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| .. | ||
| include | ||
| unix | ||
| win32 | ||
| .gitignore | ||
| bind9.xsl | ||
| bind9.xsl.h | ||
| builtin.c | ||
| config.c | ||
| control.c | ||
| controlconf.c | ||
| convertxsl.pl | ||
| fuzz.c | ||
| geoip.c | ||
| log.c | ||
| logconf.c | ||
| main.c | ||
| Makefile.in | ||
| named.conf.rst | ||
| named.rst | ||
| server.c | ||
| statschannel.c | ||
| tkeyconf.c | ||
| tsigconf.c | ||
| zoneconf.c | ||