Greeting,

FYI, we noticed the following commit (built with clang-14):

commit: f9ce0be71d1fbb038ada15ced83474b0e63f264d ("mm: Cleanup faultaround and finish_fault() codepaths")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


in testcase: trinity
version: 
with following parameters:

	number: 99999
	group: group-04

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------------------------------------+-----------+------------+
|                                                                        | v5.11-rc4 | f9ce0be71d |
+------------------------------------------------------------------------+-----------+------------+
| BUG:KCSAN:data-race_in_next_uptodate_page/next_uptodate_page           | 0         | 19         |
| BUG:KCSAN:data-race_in_mark_page_accessed/next_uptodate_page           | 0         | 17         |
| BUG:KCSAN:data-race_in_next_uptodate_page/page_memcg                   | 0         | 13         |
| BUG:KCSAN:data-race_in_next_uptodate_page/unlock_page                  | 0         | 13         |
+------------------------------------------------------------------------+-----------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@intel.com>


[  184.717904][ T1873] ==================================================================
[  184.718938][ T1873] BUG: KCSAN: data-race in next_uptodate_page / unlock_page
[  184.719828][ T1873]
[  184.720103][ T1873] write (marked) to 0xffffea00050f37c0 of 8 bytes by task 1872 on cpu 1:
[  184.721024][ T1873]  unlock_page+0x102/0x1b0
[  184.721533][ T1873]  filemap_map_pages+0x6c6/0x890
[  184.722102][ T1873]  handle_mm_fault+0x179c/0x27f0
[  184.722672][ T1873]  do_user_addr_fault+0x3fb/0x830
[  184.723263][ T1873]  exc_page_fault+0xc3/0x1a0
[  184.723845][ T1873]  asm_exc_page_fault+0x1e/0x30
[  184.724427][ T1873]
[  184.724720][ T1873] read to 0xffffea00050f37c0 of 8 bytes by task 1873 on cpu 0:
[  184.725575][ T1873]  next_uptodate_page+0x456/0x830
[  184.726161][ T1873]  filemap_map_pages+0x728/0x890
[  184.726747][ T1873]  handle_mm_fault+0x179c/0x27f0
[  184.727332][ T1873]  do_user_addr_fault+0x3fb/0x830
[  184.727905][ T1873]  exc_page_fault+0xc3/0x1a0
[  184.728440][ T1873]  asm_exc_page_fault+0x1e/0x30
[  184.729027][ T1873]
[  184.729313][ T1873] Reported by Kernel Concurrency Sanitizer on:
[  184.730019][ T1873] CPU: 0 PID: 1873 Comm: systemd-udevd Not tainted 5.11.0-rc4-00001-gf9ce0be71d1f #1
[  184.731103][ T1873] ==================================================================


To reproduce:

        # build kernel
	cd linux
	cp config-5.11.0-rc4-00001-gf9ce0be71d1f .config
	make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang