=====================================================
BUG: KMSAN: uninit-value in bpf_bprintf_prepare+0x1eca/0x23c0 kernel/bpf/helpers.c:934
 bpf_bprintf_prepare+0x1eca/0x23c0 kernel/bpf/helpers.c:934
 ____bpf_snprintf kernel/bpf/helpers.c:1060 [inline]
 bpf_snprintf+0x141/0x360 kernel/bpf/helpers.c:1044
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
 __bpf_prog_run96+0xb5/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421
 __bpf_trace_ext4_da_update_reserve_space+0x34/0x50 include/trace/events/ext4.h:1213
 trace_ext4_da_update_reserve_space include/trace/events/ext4.h:1213 [inline]
 ext4_da_update_reserve_space+0x603/0x6b0 fs/ext4/inode.c:339
 ext4_ext_map_blocks+0x5555/0xa000 fs/ext4/extents.c:4370
 ext4_map_blocks+0x139e/0x2ae0 fs/ext4/inode.c:623
 mpage_map_one_extent fs/ext4/inode.c:2163 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2216 [inline]
 ext4_do_writepages+0x264c/0x62e0 fs/ext4/inode.c:2679
 ext4_writepages+0x312/0x830 fs/ext4/inode.c:2768
 do_writepages+0x427/0xc30 mm/page-writeback.c:2612
 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 filemap_write_and_wait_range+0x169/0x420 mm/filemap.c:685
 ext4_punch_hole+0x1aa/0x1bb0 fs/ext4/inode.c:3893
 ext4_fallocate+0x4f0/0x3940 fs/ext4/extents.c:4741
 vfs_fallocate+0x7fa/0x8b0 fs/open.c:330
 do_vfs_ioctl+0x3b0c/0x3eb0 fs/ioctl.c:883
 __do_sys_ioctl fs/ioctl.c:902 [inline]
 __se_sys_ioctl+0x170/0x450 fs/ioctl.c:890
 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890
 do_syscall_64+0xd5/0x1f0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Local variable stack created at:
 __bpf_prog_run96+0x45/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421

CPU: 1 PID: 6083 Comm: syz-executor.3 Not tainted 6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================