[Drbd-dev] [CASE-29] After re-connect, WFBitMapS-WFBitMapT status has sustained continuously and copy command hangs

[Jaeheon Kim]

Dear Phil,

We think it's some kind of deadlock situation.

During reconnecting, first BIO sets pending_bitmap_work.n to 1 and waits
for status until changing from WFBitMapS to SyncSource.
At this time, If another BIO exists, this second BIO waits until
pending_bitmap_work.n to zero at inc_ap_bio().
Because status is unchanged in WFBitMapS, pending_bitmap_work.n can not be
zero forever.

Why doesn't the status change from WFBitMapS to SyncSource for the first
BIO?

Thanks.
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