Hi List,
while running bcache on 3.18.18 and having added the known patches from
the list i still get blocked bcache_writeback tasks.
The kernel does now show any stack trace on his own.
The relevant tasks look like this:
[: ~]# cat /proc/769/stack
[<ffffffffa01e9685>] closure_sync+0x25/0x90 [bcache]
[<ffffffffa01feb9c>] read_dirty+0x31c/0x410 [bcache]
[<ffffffffa01fee94>] bch_writeback_thread+0x204/0x400 [bcache]
[<ffffffff81090af9>] kthread+0xc9/0xe0
[<ffffffff815f9008>] ret_from_fork+0x58/0x90
[<ffffffffffffffff>] 0xffffffffffffffff
[: ~]# cat /proc/769/stack
[<ffffffffa01e9685>] closure_sync+0x25/0x90 [bcache]
[<ffffffffa01feb9c>] read_dirty+0x31c/0x410 [bcache]
[<ffffffffa01fee94>] bch_writeback_thread+0x204/0x400 [bcache]
[<ffffffff81090af9>] kthread+0xc9/0xe0
[<ffffffff815f9008>] ret_from_fork+0x58/0x90
[<ffffffffffffffff>] 0xffffffffffffffff
[: ~]# cat /proc/773/stack
[<ffffffff810b7601>] down+0x41/0x50
[<ffffffffa01fea78>] read_dirty+0x1f8/0x410 [bcache]
[<ffffffffa01fee94>] bch_writeback_thread+0x204/0x400 [bcache]
[<ffffffff81090af9>] kthread+0xc9/0xe0
[<ffffffff815f9008>] ret_from_fork+0x58/0x90
[<ffffffffffffffff>] 0xffffffffffffffff
[: ~]# cat /proc/783/stack
[<ffffffffa01e9685>] closure_sync+0x25/0x90 [bcache]
[<ffffffffa01feb9c>] read_dirty+0x31c/0x410 [bcache]
[<ffffffffa01fee94>] bch_writeback_thread+0x204/0x400 [bcache]
[<ffffffff81090af9>] kthread+0xc9/0xe0
[<ffffffff815f9008>] ret_from_fork+0x58/0x90
[<ffffffffffffffff>] 0xffffffffffffffff
Greets,
Stefan
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