Zach Brown 15becd6ef8 scoutfs: force locks idle as shutdown frees ...

Usually lock_free() is called as users finish using a lock and when its
state shows that it is idle and won't be freed out from under another
use.

During shutdown we manually call lock_free() on all locks because
shutdown promises that there will be no more lock users, including
networking callbacks.  But there is a case where network requests can be
pending and we shutdown before waiting for their reply.  This trips
BUG_ON assertions in lock_free() that would otherwise catch unsafe calls
of lock_free().

This is easiest to reproduce by interrupting a mount (which is waiting
on a lock to read the root inode).

The fix is to update each lock's state during shutdown to reflect the
promise made by shutdown.  Requests aren't actually pending because
we've shutdown networking befrore getting here.

Signed-off-by: Zach Brown <zab@versity.com>

2019-09-10 09:57:37 -07:00

kmod

scoutfs: force locks idle as shutdown frees

2019-09-10 09:57:37 -07:00

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