================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all write to 0xffff88812c029ae0 of 1 bytes by task 23846 on cpu 0: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xbf/0x1d0 mm/swap.c:410 lru_cache_add+0x1f/0x30 mm/swap.c:447 add_to_page_cache_lru+0x16a/0x260 mm/filemap.c:959 pagecache_get_page+0x2ac/0x6f0 mm/filemap.c:1682 grab_cache_page_write_begin+0x5d/0x90 mm/filemap.c:3259 ext4_da_write_begin+0x1a3/0x840 fs/ext4/inode.c:2965 generic_perform_write+0x136/0x320 mm/filemap.c:3309 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812c029ae0 of 1 bytes by task 23857 on cpu 1: lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746 invalidate_bdev+0x6e/0x90 fs/block_dev.c:97 btrfs_get_bdev_and_sb+0xbb/0x1a0 fs/btrfs/volumes.c:510 btrfs_open_one_device fs/btrfs/volumes.c:613 [inline] open_fs_devices+0x3ae/0x610 fs/btrfs/volumes.c:1156 btrfs_open_devices+0xc5/0xd0 fs/btrfs/volumes.c:1201 btrfs_mount_root+0x4b8/0x9c0 fs/btrfs/super.c:1533 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647 vfs_get_tree+0x56/0x1a0 fs/super.c:1545 fc_mount+0x20/0x80 fs/namespace.c:962 vfs_kern_mount.part.0+0xe6/0xf0 fs/namespace.c:992 vfs_kern_mount+0x49/0x70 fs/namespace.c:979 btrfs_mount+0x250/0xf37 fs/btrfs/super.c:1621 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647 vfs_get_tree+0x56/0x1a0 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x1004/0x14f0 fs/namespace.c:3142 ksys_mount+0xe8/0x160 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0x70/0x90 fs/namespace.c:3362 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: 23857 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================