syzbot

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

write to 0xffff888117c2c5d8 of 8 bytes by task 3485 on cpu 1:
 mem_cgroup_track_foreign_dirty_slowpath+0x3b3/0x440
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1586 [inline]
 folio_account_dirtied mm/page-writeback.c:2756 [inline]
 __folio_mark_dirty+0x3f5/0x4e0 mm/page-writeback.c:2797
 mark_buffer_dirty+0x134/0x230 fs/buffer.c:1196
 __block_write_begin_int+0x84d/0xfa0 fs/buffer.c:2127
 block_page_mkwrite+0x1bd/0x3f0 fs/buffer.c:2629
 ext4_page_mkwrite+0x73d/0xb70 fs/ext4/inode.c:6181
 do_page_mkwrite mm/memory.c:3244 [inline]
 do_shared_fault mm/memory.c:5468 [inline]
 do_fault mm/memory.c:5530 [inline]
 do_pte_missing mm/memory.c:4047 [inline]
 handle_pte_fault mm/memory.c:5889 [inline]
 __handle_mm_fault mm/memory.c:6032 [inline]
 handle_mm_fault+0x12f7/0x2ac0 mm/memory.c:6201
 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff888117c2c5d8 of 8 bytes by task 3499 on cpu 0:
 mem_cgroup_track_foreign_dirty_slowpath+0xdb/0x440 mm/memcontrol.c:3261
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1586 [inline]
 folio_account_dirtied mm/page-writeback.c:2756 [inline]
 __folio_mark_dirty+0x3f5/0x4e0 mm/page-writeback.c:2797
 mark_buffer_dirty+0x134/0x230 fs/buffer.c:1196
 __block_commit_write fs/buffer.c:2189 [inline]
 block_write_end+0x123/0x210 fs/buffer.c:2265
 ext4_write_end+0x148/0x770 fs/ext4/inode.c:1304
 generic_perform_write+0x33c/0x4a0 mm/filemap.c:4204
 ext4_buffered_write_iter+0x1ed/0x3c0 fs/ext4/file.c:299
 ext4_file_write_iter+0x383/0xf20
 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+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 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: 0x00000000ffff970b -> 0x00000000ffff97b8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3499 Comm: syz.1.15 Not tainted 6.13.0-syzkaller-09950-g60c828cf80c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================