syzbot

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BUG: KCSAN: data-race in __mod_memcg_lruvec_state / mem_cgroup_css_rstat_flush

write to 0xffff888237d344c0 of 4 bytes by task 1587 on cpu 0:
 mem_cgroup_css_rstat_flush+0x4ea/0x540 mm/memcontrol.c:5848
 cgroup_rstat_flush_locked+0x848/0x980 kernel/cgroup/rstat.c:245
 cgroup_rstat_flush+0x26/0x40 kernel/cgroup/rstat.c:277
 do_flush_stats mm/memcontrol.c:745 [inline]
 flush_memcg_stats_dwork+0x50/0x90 mm/memcontrol.c:782
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read-write to 0xffff888237d344c0 of 4 bytes by task 24057 on cpu 1:
 memcg_rstat_updated mm/memcontrol.c:725 [inline]
 __mod_memcg_lruvec_state+0x13a/0x1a0 mm/memcontrol.c:875
 __mod_lruvec_state+0x3c/0x50 mm/memcontrol.c:897
 __update_lru_size include/linux/mm_inline.h:47 [inline]
 update_lru_size include/linux/mm_inline.h:56 [inline]
 lruvec_add_folio include/linux/mm_inline.h:326 [inline]
 lru_add_fn+0x289/0x430 mm/swap.c:215
 folio_batch_move_lru+0x20c/0x2c0 mm/swap.c:233
 folio_batch_add_and_move mm/swap.c:249 [inline]
 folio_add_lru+0xd4/0x130 mm/swap.c:532
 filemap_add_folio+0x103/0x160 mm/filemap.c:962
 __filemap_get_folio+0x2f1/0x5b0 mm/filemap.c:1934
 ext4_da_write_begin+0x2ef/0x550 fs/ext4/inode.c:2885
 generic_perform_write+0x1d5/0x410 mm/filemap.c:3974
 ext4_buffered_write_iter+0x1f6/0x380 fs/ext4/file.c:299
 ext4_file_write_iter+0x29f/0xe30
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x771/0x8e0 fs/read_write.c:590
 ksys_write+0xeb/0x1b0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 x64_sys_call+0x27b7/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24057 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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