And again I am sorry - it looks like it IS related to the start_sb. Because when I look at the stack track of the stuck flush-251:0 process (cat /proc/1428/stack) I see the following output: [<ffffffff8117dae5>] sync_buffer+0x45/0x50 [<ffffffff8117da96>] __wait_on_buffer+0x26/0x30 [<ffffffff8117ea99>] sync_dirty_buffer+0x69/0xe0 [<ffffffff8122d24d>] jbd2_journal_update_superblock+0xad/0x170 [<ffffffff8122a757>] jbd2_cleanup_journal_tail+0x107/0x1e0 [<ffffffff8122af16>] jbd2_log_do_checkpoint+0x186/0x260 [<ffffffff8122b09e>] __jbd2_log_wait_for_space+0xae/0x1d0 [<ffffffff81226867>] start_this_handle+0x107/0x4b0 [<ffffffff81226de5>] jbd2_journal_start+0xb5/0x100 [<ffffffff81202a68>] ext4_journal_start_sb+0xf8/0x130 [<ffffffff811f06ff>] ext4_da_writepages+0x25f/0x640 [<ffffffff8110aab1>] do_writepages+0x21/0x40 [<ffffffff811759d6>] writeback_single_inode+0xe6/0x3f0 [<ffffffff81176135>] writeback_sb_inodes+0x195/0x280 [<ffffffff81176b8c>] wb_writeback+0x12c/0x2b0 [<ffffffff81176db9>] wb_do_writeback+0xa9/0x190 [<ffffffff81176ef3>] bdi_writeback_task+0x53/0x160 [<ffffffff8111a196>] bdi_start_fn+0x86/0x100 [<ffffffff8107ec56>] kthread+0x96/0xa0 [<ffffffff8100aee4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/620242 Title: hang in ext4_journal_start_sb making an lvm snapshot -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
