On Fri 03-06-16 18:16:12, Eryu Guan wrote: > On Thu, Jun 02, 2016 at 02:17:50PM +0200, Jan Kara wrote: > > > > So I was trying but I could not reproduce the hang either. Can you find out > > which page is jbd2 thread waiting for and dump page->index, page->flags and > > also bh->b_state, bh->b_blocknr of all 4 buffer heads attached to it via > > page->private? Maybe that will shed some light... > > I'm using crash on live system when the hang happens, so I got the page > address from "bt -f" > > #6 [ffff880212343b40] wait_on_page_bit at ffffffff8119009e > ffff880212343b48: ffffea0002c23600 000000000000000d > ffff880212343b58: 0000000000000000 0000000000000000 > ffff880212343b68: ffff880213251480 ffffffff810cd000 > ffff880212343b78: ffff88021ff27218 ffff88021ff27218 > ffff880212343b88: 00000000c1b4a75a ffff880212343c68 > ffff880212343b98: ffffffff811901bf Thanks for debugging! In the end I was able to reproduce the issue on my UML instance as well and I'm debugging what's going on. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
