syzbot

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BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff88812d8d56f0 of 8 bytes by task 1767 on cpu 1:
 __ext4_unlink+0x310/0x4c0 fs/ext4/namei.c:3368
 ext4_unlink+0x1eb/0x340 fs/ext4/namei.c:3403
 vfs_unlink+0x24a/0x400 fs/namei.c:4035
 do_unlinkat+0x238/0x4f0 fs/namei.c:4102
 __do_sys_unlink fs/namei.c:4149 [inline]
 __se_sys_unlink fs/namei.c:4147 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4147
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812d8d56f0 of 8 bytes by task 3969 on cpu 0:
 ext4_encode_extra_time fs/ext4/ext4.h:896 [inline]
 __ext4_update_other_inode_time+0x18b/0x5c0 fs/ext4/inode.c:4974
 ext4_update_other_inodes_time fs/ext4/inode.c:5006 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5135 [inline]
 ext4_mark_iloc_dirty+0x12b6/0x1750 fs/ext4/inode.c:5724
 ext4_xattr_set_handle+0xf6e/0x1110 fs/ext4/xattr.c:2395
 ext4_initxattrs+0x66/0xb0 fs/ext4/xattr_security.c:44
 security_inode_init_security+0x1a9/0x260 security/security.c:1099
 ext4_init_security+0x30/0x40 fs/ext4/xattr_security.c:58
 __ext4_new_inode+0x29a1/0x2f70 fs/ext4/ialloc.c:1320
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3465
 vfs_symlink+0x23a/0x300 fs/namei.c:4182
 do_symlinkat+0xeb/0x280 fs/namei.c:4212
 __do_sys_symlink fs/namei.c:4233 [inline]
 __se_sys_symlink fs/namei.c:4231 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000363960b0 -> 0x000000003b0221b8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3969 Comm: syz-executor.0 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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