Re: FIle copy to FAT FS on NVDIMM hits BUG_ON at fs/buffer.c:3305!
On Wed, Jul 26, 2017 at 06:23:08PM +0900, OGAWA Hirofumi wrote:
"Kani, Toshimitsu" <toshi.kani(a)hpe.com> writes:
> kernel BUG at fs/buffer.c:3305!
> invalid opcode: 0000 [#1] SMP
> :
> Workqueue: writeback wb_workfn (flush-259:0)
> task: ffff8d02595b8000 task.stack: ffffa22242400000
> RIP: 0010:try_to_free_buffers+0xd2/0xe0
> RSP: 0018:ffffa22242403830 EFLAGS: 00010246
> RAX: 00afffc000001028 RBX: 0000000000000008 RCX: ffff8d012dcf19c0
> RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffc468e3b52b80
> RBP: ffffa22242403858 R08: 0000000000000000 R09: 000000000002067c
> R10: ffff8d027ffe6000 R11: 0000000000000000 R12: 0000000000000000
> R13: ffff8d022fccdbe0 R14: ffffc468e3b52b80 R15: ffffa22242403ad0
> FS: 0000000000000000(0000) GS:ffff8d027fd40000(0000)
The locking of this path seems to be broken. The guy familiar to
bdev_write_page() path will made real fix though, The following patch
should be explaining enough what is wrong.
Is there someone in particular who is familiar with bdev_write_page() that is
working on this fix, or does someone need to pick this up?