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1aa5743125
When I repeatedly modprobe and rmmod dax.ko, kmemleak report a
memory leak as follows:
unreferenced object 0xffff9a5588c05088 (size 8):
comm "modprobe", pid 261, jiffies 4294693644 (age 42.063s)
...
backtrace:
[<00000000e007ced0>] kstrdup+0x35/0x70
[<000000002ae73897>] kstrdup_const+0x3d/0x50
[<000000002b00c9c3>] kvasprintf_const+0xbc/0xf0
[<000000008023282f>] kobject_set_name_vargs+0x3b/0xd0
[<00000000d2cbaa4e>] kobject_set_name+0x62/0x90
[<00000000202e7a22>] bus_register+0x7f/0x2b0
[<000000000b77792c>] 0xffffffffc02840f7
[<000000002d5be5ac>] 0xffffffffc02840b4
[<00000000dcafb7cd>] do_one_initcall+0x58/0x240
[<00000000049fe480>] do_init_module+0x56/0x1e2
[<0000000022671491>] load_module+0x2517/0x2840
[<000000001a2201cb>] __do_sys_finit_module+0x9c/0xe0
[<000000003eb304e7>] do_syscall_64+0x33/0x40
[<0000000051c5fd06>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
When rmmod dax is executed, dax_bus_exit() is missing. This patch
can fix this bug.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.