[Bug 12579] ext4 filesystem hang

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=12579





------- Comment #6 from sandeen@redhat.com  2009-02-12 16:42 -------
dJust for the record; here are the paths we're stuck on:

livecd:

sys_fdatasync
        do_fsync
                vfs_fsync
                        filemap_fdatawrite
                                __filemap_fdatawrite_range
                                        do_writepage
                                                ext4_da_writepages
                                                        write_cache_pages
                                                                lock page
(currently locked by pdflush)

pdflush:

pdflush
        background_writeout
                writeback_inodes
                        generic_sync_sb_inodes
                                __writeback_single_inode
                                        do_writepages
                                                ext4_da_writepages
                                                        write_cache_pages
                                                                lock page
(currently loscked by livecd)

the pdflush wbc looks like:

[1]kdb> wbc 0xffff88007d4abe10
struct writeback_control at  0xffff88007d4abe10
 bdi = (null) sync_mode 0 (NONE)
 nr_to_write = 992 pages_skipped = 0
 range_start 0, range_end 0
 nonblocking 1   congestion 0 kupdate 0   reclaim 0
  writepages 1 range_cyclic 1 more_io 0 no_update 1

and the livecd-creator fsync wbc looks like:

[1]kdb> wbc 0xffff880012821ea8
struct writeback_control at  0xffff880012821ea8
 bdi = (null) sync_mode 1 (ALL)
 nr_to_write = 9223372036854775689 pages_skipped = 0
 range_start 0, range_end 9223372036854775807
 nonblocking 0   congestion 0 kupdate 0   reclaim 0
  writepages 1 range_cyclic 0 more_io 0 no_update 1


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