mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-06 19:08:57 +09:00
d5a480b44b
After starting VNC server or running CTS test, kernel will hang and
can see below call trace:
[961816] INFO: task khugepaged:42 blocked for more than 120 seconds.
[968581] Tainted: G OE 4.13.0 #1
[973495] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[980962] khugepaged D 0 42 2 0x00000000
[980967] Call Trace:
[980977] __schedule+0x28d/0x890
[980982] schedule+0x36/0x80
[980986] rwsem_down_read_failed+0x139/0x1c0
[980991] ? update_curr+0x100/0x1c0
[981004] call_rwsem_down_read_failed+0x18/0x30
[981007] down_read+0x20/0x40
[981012] khugepaged_scan_mm_slot+0x78/0x1ac0
[981018] ? __switch_to+0x23e/0x4a0
[981022] ? finish_task_switch+0x79/0x240
[981026] khugepaged+0x146/0x480
[981031] ? remove_wait_queue+0x60/0x60
[981035] kthread+0x109/0x140
[981037] ? khugepaged_scan_mm_slot+0x1ac0/0x1ac0
[981039] ? kthread_park+0x60/0x60
[981044] ret_from_fork+0x25/0x30
After checking code and found 'commit b72cf4fca2 ("drm/amdgpu: move
taking mmap_sem into get_user_pages v2")' forget to drop one case of
up_read.
Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.