Messages in this thread | | | Date | Tue, 19 Apr 2016 18:26:27 -0700 | From | Nikhilesh Reddy <> | Subject | Umount failing due to a file leak on 3.18 Android |
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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.
Is there some sort of race condition?
-- Thanks Nikhilesh Reddy
Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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