Comment 19 for bug 1447756

So when job gets terminated we don't succeed to write to to the disk and it is added to the unflushed list.
Problem is another call to write function later on, but before we get writable disk signal:
[ 7.460627]init: log_handle_unflushed:778:len=32673, path='/var/log/upstart/ureadahead-touch.log'
[ 7.460682]init: unflushed->len=32673
[ 7.460736]init: job_process_terminated:1877:adding job ureadahead-touch to unflushed list

but then later one we get:
[ 7.968094]init: log_io_reader:368:
[ 7.968158]init: log_file_write:552:unflashed:61817, new_len:150, path:/var/log/upstart/ureadahead-touch.log
[ 7.975087]init: log_file_write:579:unflashed->len:61817, written_len:61817
calling "nih_io_buffer_shrink (log->unflushed, (size_t)wlen);"
[ 7.975167]init: log_file_write:581:unflashed->len:0

and eventually we get:
[ 8.369166]init: control_notify_disk_writeable<<
[ 8.369239]init: log_clear_unflushed<<
[ 8.369280]init: OK checking assert:unflashed->len = 46
[ 8.369435]init: log_clear_unflushed:888:
[ 8.369492]init: log_file_write:552:unflashed->len=46, new:0, path:/var/log/upstart/container-detect.log
[ 8.370305]init: log_file_write:579:len:46, wlen:46
[ 8.370359]init: log_file_write:581:len:0
[ 8.370450]init: OK checking assert:unflashed->len = 0
[ 8.370509]init: log.c:874: Assertion failed in log_clear_unflushed: log->unflushed->len

As you can see call to write in the middle is one causing the issue, since it flushes log buffer, but does not remove it from unflushed list.