BTRFS info (device loop0): disabling free space tree
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BTRFS info (device loop0): checking UUID tree
=====================================================
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 _copy_to_user+0xbc/0x100 lib/usercopy.c:40
 copy_to_user include/linux/uaccess.h:191 [inline]
 btrfs_ioctl_logical_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3438
 btrfs_ioctl+0x72e/0x1290
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4727
 __do_compat_sys_ioctl fs/ioctl.c:972 [inline]
 __se_compat_sys_ioctl+0x79b/0xfe0 fs/ioctl.c:914
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:914
 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:230
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:255
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:293
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc_node+0x11c/0x3c0 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 kvmalloc_node+0xc0/0x2d0 mm/util.c:607
 kvmalloc include/linux/slab.h:738 [inline]
 init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2776
 btrfs_ioctl_logical_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3419
 btrfs_ioctl+0x72e/0x1290
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4727
 __do_compat_sys_ioctl fs/ioctl.c:972 [inline]
 __se_compat_sys_ioctl+0x79b/0xfe0 fs/ioctl.c:914
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:914
 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:230
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:255
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:293
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

Bytes 40-91 of 92 are uninitialized
Memory access of size 92 starts at ffff888121066ea0

CPU: 1 PID: 7787 Comm: syz-executor.0 Not tainted 6.7.0-rc1-syzkaller-00139-g6bc40e44f1dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
=====================================================