ext4 filesystem being mounted at /72/bus supports timestamps until 2038-01-19 (0x7fffffff)
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BUG: KCSAN: data-race in mem_cgroup_track_foreign_dirty_slowpath / mem_cgroup_track_foreign_dirty_slowpath

write to 0xffff888100225cd8 of 8 bytes by task 4824 on cpu 1:
 mem_cgroup_track_foreign_dirty_slowpath+0x31e/0x440 mm/memcontrol.c:3875
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1599 [inline]
 folio_account_dirtied mm/page-writeback.c:2628 [inline]
 __folio_mark_dirty+0x46e/0x520 mm/page-writeback.c:2677
 mark_buffer_dirty+0x120/0x1f0 fs/buffer.c:1014
 block_commit_write+0x120/0x1d0 fs/buffer.c:2104
 block_page_mkwrite+0x1a5/0x1d0 fs/buffer.c:2555
 ext4_page_mkwrite+0x828/0xa90 fs/ext4/inode.c:6918
 do_page_mkwrite mm/memory.c:3754 [inline]
 do_shared_fault mm/memory.c:6014 [inline]
 do_fault mm/memory.c:6076 [inline]
 do_pte_missing mm/memory.c:4638 [inline]
 handle_pte_fault mm/memory.c:6496 [inline]
 __handle_mm_fault mm/memory.c:6645 [inline]
 handle_mm_fault+0x27a4/0x3ae0 mm/memory.c:6814
 do_user_addr_fault+0x636/0x1060 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

read to 0xffff888100225cd8 of 8 bytes by task 4825 on cpu 0:
 mem_cgroup_track_foreign_dirty_slowpath+0xd2/0x440 mm/memcontrol.c:3855
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1599 [inline]
 folio_account_dirtied mm/page-writeback.c:2628 [inline]
 __folio_mark_dirty+0x46e/0x520 mm/page-writeback.c:2677
 mark_buffer_dirty+0x120/0x1f0 fs/buffer.c:1014
 folio_zero_new_buffers+0x272/0x2d0 fs/buffer.c:1917
 block_write_end+0xad/0xc0 fs/buffer.c:2177
 ext4_write_end+0x98/0x670 fs/ext4/inode.c:1450
 ext4_da_write_end+0x15e/0x6f0 fs/ext4/inode.c:3288
 generic_perform_write+0x314/0x490 mm/filemap.c:4395
 ext4_buffered_write_iter+0x2e3/0x480 fs/ext4/file.c:354
 ext4_file_write_iter+0x36e/0x1020 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57f/0x9a0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0xfd/0x150 fs/read_write.c:799
 x64_sys_call+0x23be/0x2550 arch/x86/include/generated/asm/syscalls_64.h:19
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000ffffa272 -> 0x00000000ffffa597

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4825 Comm: syz.1.363 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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