==================================================================
BUG: KCSAN: data-race in __pagevec_lru_add / lru_add_drain_all

write to 0xffff88813bc27550 of 1 bytes by task 21755 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:56 [inline]
 __pagevec_lru_add+0x24b/0x280 mm/swap.c:1017
 lru_add_drain_cpu+0x6a/0x260 mm/swap.c:606
 lru_add_drain mm/swap.c:710 [inline]
 __pagevec_release+0x5a/0xd0 mm/swap.c:940
 pagevec_release include/linux/pagevec.h:81 [inline]
 shmem_undo_range+0x327/0x1220 mm/shmem.c:931
 shmem_truncate_range mm/shmem.c:1030 [inline]
 shmem_evict_inode+0x115/0x550 mm/shmem.c:1132
 evict+0x1aa/0x410 fs/inode.c:578
 iput_final fs/inode.c:1654 [inline]
 iput+0x3fd/0x520 fs/inode.c:1680
 dentry_unlink_inode+0x210/0x220 fs/dcache.c:374
 __dentry_kill+0x293/0x450 fs/dcache.c:580
 dentry_kill fs/dcache.c:693 [inline]
 dput+0x218/0x430 fs/dcache.c:886
 __fput+0x3b3/0x4f0 fs/file_table.c:293
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x17c/0x1b0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813bc27550 of 1 bytes by task 14199 on cpu 1:
 pagevec_count include/linux/pagevec.h:61 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:813
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 btrfs_close_bdev fs/btrfs/volumes.c:1116 [inline]
 btrfs_close_one_device fs/btrfs/volumes.c:1135 [inline]
 close_fs_devices+0x25e/0x4d0 fs/btrfs/volumes.c:1165
 btrfs_close_devices+0x44/0x210 fs/btrfs/volumes.c:1180
 open_ctree+0x529/0x230b fs/btrfs/disk-io.c:3599
 btrfs_fill_super fs/btrfs/super.c:1356 [inline]
 btrfs_mount_root+0x742/0x830 fs/btrfs/super.c:1723
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 fc_mount fs/namespace.c:993 [inline]
 vfs_kern_mount+0xc6/0x130 fs/namespace.c:1023
 btrfs_mount+0x278/0x740 fs/btrfs/super.c:1783
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14199 Comm: syz-executor.5 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
BTRFS error (device loop2): open_ctree failed
loop5: detected capacity change from 0 to 258
BTRFS error (device loop5): superblock checksum mismatch
BTRFS error (device loop5): open_ctree failed