=====================================================
BUG: KMSAN: uninit-value in bch2_write_inode+0x9fa/0xf80 fs/bcachefs/fs.c:109
 bch2_write_inode+0x9fa/0xf80 fs/bcachefs/fs.c:109
 bch2_ioc_fssetxattr fs/bcachefs/fs-ioctl.c:189 [inline]
 bch2_fs_file_ioctl+0x4065/0x49f0 fs/bcachefs/fs-ioctl.c:550
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0x246/0x440 fs/ioctl.c:892
 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:892
 x64_sys_call+0x19f0/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 bch2_inode_opts_get+0xd59/0xe40 fs/bcachefs/inode.c:1202
 bch2_inode_rebalance_opts_get fs/bcachefs/inode.h:292 [inline]
 bch2_write_inode+0x6a9/0xf80 fs/bcachefs/fs.c:107
 bch2_ioc_fssetxattr fs/bcachefs/fs-ioctl.c:189 [inline]
 bch2_fs_file_ioctl+0x4065/0x49f0 fs/bcachefs/fs-ioctl.c:550
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0x246/0x440 fs/ioctl.c:892
 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:892
 x64_sys_call+0x19f0/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable io_opts.i117 created at:
 bch2_inode_rebalance_opts_get fs/bcachefs/inode.h:291 [inline]
 bch2_write_inode+0x696/0xf80 fs/bcachefs/fs.c:107
 bch2_ioc_fssetxattr fs/bcachefs/fs-ioctl.c:189 [inline]
 bch2_fs_file_ioctl+0x4065/0x49f0 fs/bcachefs/fs-ioctl.c:550

CPU: 1 UID: 0 PID: 7164 Comm: syz.7.218 Not tainted 6.13.0-syzkaller-09950-g60c828cf80c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
=====================================================