==================================================================
BUG: KCSAN: data-race in mem_cgroup_track_foreign_dirty_slowpath / mem_cgroup_track_foreign_dirty_slowpath

write to 0xffff8881163fc5d8 of 8 bytes by task 4683 on cpu 1:
 mem_cgroup_track_foreign_dirty_slowpath+0x3b3/0x440
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1624 [inline]
 folio_account_dirtied mm/page-writeback.c:2754 [inline]
 __folio_mark_dirty+0x3f5/0x4e0 mm/page-writeback.c:2797
 mark_buffer_dirty+0x148/0x250 fs/buffer.c:1201
 __block_write_begin_int+0x84d/0xfa0 fs/buffer.c:2132
 block_page_mkwrite+0x1bd/0x3f0 fs/buffer.c:2634
 ext4_page_mkwrite+0x73d/0xb70 fs/ext4/inode.c:6123
 do_page_mkwrite mm/memory.c:3162 [inline]
 do_shared_fault mm/memory.c:5362 [inline]
 do_fault mm/memory.c:5424 [inline]
 do_pte_missing mm/memory.c:3965 [inline]
 handle_pte_fault mm/memory.c:5755 [inline]
 __handle_mm_fault mm/memory.c:5898 [inline]
 handle_mm_fault+0x12de/0x2a80 mm/memory.c:6066
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff8881163fc5d8 of 8 bytes by task 4692 on cpu 0:
 mem_cgroup_track_foreign_dirty_slowpath+0xdb/0x440 mm/memcontrol.c:3250
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1624 [inline]
 folio_account_dirtied mm/page-writeback.c:2754 [inline]
 __folio_mark_dirty+0x3f5/0x4e0 mm/page-writeback.c:2797
 mark_buffer_dirty+0x148/0x250 fs/buffer.c:1201
 __block_commit_write fs/buffer.c:2194 [inline]
 block_write_end+0x123/0x210 fs/buffer.c:2270
 ext4_da_do_write_end fs/ext4/inode.c:2999 [inline]
 ext4_da_write_end+0x1ff/0x7e0 fs/ext4/inode.c:3071
 generic_perform_write+0x33c/0x4a0 mm/filemap.c:4069
 ext4_buffered_write_iter+0x1ea/0x370 fs/ext4/file.c:299
 ext4_file_write_iter+0x293/0xe10
 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x39b/0x970 fs/read_write.c:1388
 __do_sys_sendfile64 fs/read_write.c:1455 [inline]
 __se_sys_sendfile64 fs/read_write.c:1441 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1441
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000ffff9cc9 -> 0x00000000ffff9e04

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4692 Comm: syz.2.163 Not tainted 6.12.0-rc3-syzkaller-00217-g4d939780b705 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================