syzbot

==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / folio_batch_move_lru

write to 0xffff888237c29c88 of 1 bytes by task 7906 on cpu 0:
 folio_batch_reinit include/linux/pagevec.h:48 [inline]
 folio_batch_move_lru+0x2bf/0x2f0 mm/swap.c:225
 lru_add_drain_cpu+0x77/0x270 mm/swap.c:652
 lru_add_drain+0x34/0x80 mm/swap.c:752
 free_pages_and_swap_cache+0x1a/0x80 mm/swap_state.c:313
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x282/0x300 mm/mmu_gather.c:300
 tlb_finish_mmu+0x8c/0x100 mm/mmu_gather.c:392
 exit_mmap+0x2cd/0x6e0 mm/mmap.c:3300
 __mmput+0x28/0x1c0 kernel/fork.c:1343
 mmput+0x4c/0x60 kernel/fork.c:1365
 exit_mm+0xe3/0x180 kernel/exit.c:569
 do_exit+0x585/0x16d0 kernel/exit.c:858
 do_group_exit+0x101/0x150 kernel/exit.c:1020
 get_signal+0xf4e/0x10a0 kernel/signal.c:2893
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x58/0x120 kernel/entry/common.c:212
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237c29c88 of 1 bytes by task 7984 on cpu 1:
 folio_batch_count include/linux/pagevec.h:53 [inline]
 cpu_needs_drain mm/swap.c:795 [inline]
 __lru_add_drain_all+0x137/0x420 mm/swap.c:889
 lru_cache_disable+0x1f/0x20 mm/swap.c:942
 do_pages_move mm/migrate.c:2185 [inline]
 kernel_move_pages mm/migrate.c:2447 [inline]
 __do_sys_move_pages mm/migrate.c:2461 [inline]
 __se_sys_move_pages+0x2ef/0x1560 mm/migrate.c:2456
 __x64_sys_move_pages+0x78/0x90 mm/migrate.c:2456
 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+0x63/0x6b

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7984 Comm: syz-executor.2 Not tainted 6.8.0-rc7-syzkaller-00260-gfa4b851b4ad6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
==================================================================