syzbot

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BUG: KCSAN: data-race in ext4_free_inodes_count / ext4_free_inodes_set

write to 0xffff888103db700e of 2 bytes by task 8771 on cpu 0:
 ext4_free_inodes_set+0x1b/0x80 fs/ext4/super.c:403
 __ext4_new_inode+0x1966/0x2700 fs/ext4/ialloc.c:1215
 ext4_symlink+0x2ba/0x6f0 fs/ext4/namei.c:3293
 vfs_symlink+0x18a/0x280 fs/namei.c:4297
 do_symlinkat+0xe2/0x330 fs/namei.c:4326
 __do_sys_symlinkat fs/namei.c:4343 [inline]
 __se_sys_symlinkat fs/namei.c:4340 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103db700e of 2 bytes by task 8774 on cpu 1:
 ext4_free_inodes_count+0x18/0x80 fs/ext4/super.c:347
 find_group_other fs/ext4/ialloc.c:595 [inline]
 __ext4_new_inode+0x793/0x2700 fs/ext4/ialloc.c:1019
 ext4_symlink+0x2ba/0x6f0 fs/ext4/namei.c:3293
 vfs_symlink+0x18a/0x280 fs/namei.c:4297
 do_symlinkat+0xe2/0x330 fs/namei.c:4326
 __do_sys_symlinkat fs/namei.c:4343 [inline]
 __se_sys_symlinkat fs/namei.c:4340 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x1b74 -> 0x1b73

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8774 Comm: syz-executor.0 Not tainted 5.18.0-rc6-syzkaller-00009-gfeb9c5e19e91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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