==================================================================
BUG: KCSAN: data-race in ext4_xattr_get / ext4_xattr_release_block

write to 0xffff8880a07e5004 of 4 bytes by task 7908 on cpu 1:
 ext4_xattr_release_block+0x15e/0x4b0 fs/ext4/xattr.c:1259
 ext4_xattr_delete_inode+0x6e0/0x820 fs/ext4/xattr.c:2912
 ext4_evict_inode+0x617/0xa40 fs/ext4/inode.c:281
 evict+0x244/0x410 fs/inode.c:575
 iput_final fs/inode.c:1571 [inline]
 iput+0x371/0x4e0 fs/inode.c:1597
 do_unlinkat+0x378/0x530 fs/namei.c:4143
 __do_sys_unlink fs/namei.c:4184 [inline]
 __se_sys_unlink fs/namei.c:4182 [inline]
 __x64_sys_unlink+0x3b/0x50 fs/namei.c:4182
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a07e5004 of 4 bytes by task 9624 on cpu 0:
 ext4_xattr_block_cache_insert fs/ext4/xattr.c:2959 [inline]
 ext4_xattr_block_get fs/ext4/xattr.c:537 [inline]
 ext4_xattr_get+0x31e/0x5c0 fs/ext4/xattr.c:652
 ext4_xattr_security_get+0x3b/0x50 fs/ext4/xattr_security.c:20
 __vfs_getxattr+0x9a/0xd0 fs/xattr.c:311
 cap_inode_need_killpriv+0x3a/0x60 security/commoncap.c:300
 security_inode_need_killpriv+0x5d/0x90 security/security.c:1327
 dentry_needs_remove_privs.part.0+0x2d/0x80 fs/inode.c:1816
 dentry_needs_remove_privs include/linux/fs.h:3561 [inline]
 file_remove_privs+0x1e9/0x2b0 fs/inode.c:1856
 file_modified+0x22/0x80 fs/inode.c:1925
 ext4_write_checks+0x4d/0x80 fs/ext4/file.c:249
 ext4_buffered_write_iter+0x8a/0x290 fs/ext4/file.c:265
 ext4_file_write_iter+0xfa/0xd70 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693
 do_iter_write fs/read_write.c:998 [inline]
 do_iter_write+0x13b/0x3c0 fs/read_write.c:979
 vfs_iter_write+0x5c/0x80 fs/read_write.c:1039
 iter_file_splice_write+0x536/0x850 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0xa0/0xc0 fs/splice.c:1037
 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1581 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1567
 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: 0 PID: 9624 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================