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BUG: KCSAN: data-race in lru_add_drain_all / pagevec_lru_move_fn

write to 0xffff88812c029b60 of 1 bytes by task 8941 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:63 [inline]
 pagevec_lru_move_fn+0x163/0x180 mm/swap.c:216
 __pagevec_lru_add mm/swap.c:987 [inline]
 lru_add_drain_cpu+0x178/0x2e0 mm/swap.c:599
 lru_add_drain+0x35/0x80 mm/swap.c:694
 unmap_region+0x6b/0x270 mm/mmap.c:2590
 __do_munmap+0x63a/0xb40 mm/mmap.c:2813
 __vm_munmap+0xb2/0x130 mm/mmap.c:2836
 vm_munmap+0x29/0x40 mm/mmap.c:2854
 elf_map+0x1bd/0x200 fs/binfmt_elf.c:382
 load_elf_interp fs/binfmt_elf.c:603 [inline]
 load_elf_binary+0x15b4/0x2d20 fs/binfmt_elf.c:1058
 search_binary_handler fs/exec.c:1662 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1639
 exec_binprm fs/exec.c:1705 [inline]
 __do_execve_file.isra.0+0xb53/0x1120 fs/exec.c:1825
 do_execveat_common fs/exec.c:1871 [inline]
 do_execve fs/exec.c:1888 [inline]
 __do_sys_execve fs/exec.c:1964 [inline]
 __se_sys_execve fs/exec.c:1959 [inline]
 __x64_sys_execve+0x62/0x80 fs/exec.c:1959
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812c029b60 of 1 bytes by task 8937 on cpu 1:
 lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746
 invalidate_bdev+0x6e/0x90 fs/block_dev.c:97
 __loop_clr_fd+0x250/0x740 drivers/block/loop.c:1140
 loop_clr_fd drivers/block/loop.c:1237 [inline]
 lo_ioctl+0x24c/0xc70 drivers/block/loop.c:1606
 __blkdev_driver_ioctl block/ioctl.c:321 [inline]
 blkdev_ioctl+0x19c/0x400 block/ioctl.c:717
 block_ioctl+0x95/0xc0 fs/block_dev.c:1983
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x109/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:770
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8937 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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