On Tue, Apr 19, 2016 at 06:26:27PM -0700, Nikhilesh Reddy wrote: > Hi > > I am looking into a bug that results in umount failures ( since there is a > mount ref from the leaked file that is never freed on the mount ) > > The issue seems to be a result of the following callstack > > 39.958104: <6> Call trace: > 39.958108: <2> [<ffffffc0001baa58>] fput+0x1e0/0x1f8 > 39.958113: <2> [<ffffffc0001b6ce8>] filp_close+0xa0/0xb8 > 39.958119: <2> [<ffffffc0001d3ca8>] put_files_struct+0x88/0xf0 > 39.958123: <2> [<ffffffc000973c40>] binder_deferred_func+0x6a8/0x704 > 39.958129: <2> [<ffffffc0000ba32c>] process_one_work+0x238/0x3f0 > 39.958133: <2> [<ffffffc0000bb160>] worker_thread+0x2f8/0x418 > > What seems to occur is that once in a while a file ( say a.txt) is fput in > the above stack > right as the task is being killed > > And then we see that the fput schedules a delayed_fput_work on this file > > But when the function delayed_fput() is actually run : > the file that was put i.e this a.txt is not in the delayed_fput_list > > Any chance you can help me get to the bottom of this leak? > I dont understand why the delayed_fput_list is missing the file.
3.18 is very old, can you duplicate this on 4.5 or newer? thanks, greg k-h
