syzbot

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BUG: KCSAN: data-race in munlock_page / need_mlock_page_drain

read-write to 0xffff888237c27f00 of 1 bytes by task 1833 on cpu 0:
 pagevec_add include/linux/pagevec.h:75 [inline]
 munlock_page+0x81/0x2a0 mm/mlock.c:302
 munlock_vma_page mm/internal.h:455 [inline]
 page_remove_rmap+0x17e/0x220 mm/rmap.c:1415
 zap_pte_range+0x728/0x1430 mm/memory.c:1389
 zap_pmd_range mm/memory.c:1497 [inline]
 zap_pud_range mm/memory.c:1526 [inline]
 zap_p4d_range mm/memory.c:1547 [inline]
 unmap_page_range+0x2dc/0x3d0 mm/memory.c:1568
 unmap_single_vma+0x157/0x210 mm/memory.c:1613
 unmap_vmas+0xd0/0x180 mm/memory.c:1645
 exit_mmap+0x11f/0x380 mm/mmap.c:3148
 __mmput+0x27/0x1b0 kernel/fork.c:1183
 mmput+0x3d/0x50 kernel/fork.c:1205
 exit_mm+0xdb/0x170 kernel/exit.c:510
 do_exit+0x51d/0x1720 kernel/exit.c:782
 do_group_exit+0xa5/0x160 kernel/exit.c:925
 get_signal+0xf54/0x1020 kernel/signal.c:2864
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237c27f00 of 1 bytes by task 1858 on cpu 1:
 pagevec_count include/linux/pagevec.h:62 [inline]
 need_mlock_page_drain+0x2c/0x50 mm/mlock.c:236
 __lru_add_drain_all+0x24c/0x3e0 mm/swap.c:832
 lru_cache_disable+0x1b/0x20 mm/swap.c:886
 do_mbind+0x416/0x8b0 mm/mempolicy.c:1291
 kernel_mbind mm/mempolicy.c:1469 [inline]
 __do_sys_mbind mm/mempolicy.c:1547 [inline]
 __se_sys_mbind+0x13b/0x3f0 mm/mempolicy.c:1543
 __x64_sys_mbind+0x74/0x80 mm/mempolicy.c:1543
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1858 Comm: syz-executor.5 Not tainted 5.18.0-rc1-syzkaller-00350-g1862a69c9174-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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