=====================================================
BUG: KMSAN: uninit-value in netfs_clear_buffer+0x216/0x4e0 fs/netfs/misc.c:75
 netfs_clear_buffer+0x216/0x4e0 fs/netfs/misc.c:75
 netfs_free_request+0x51f/0x890 fs/netfs/objects.c:146
 netfs_put_request+0x161/0x360 fs/netfs/objects.c:170
 netfs_write_collection_worker+0x7337/0x7c20
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4092 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 __kmalloc_cache_noprof+0x4f0/0xb00 mm/slub.c:4291
 kmalloc_noprof include/linux/slab.h:878 [inline]
 netfs_buffer_append_folio+0x2cf/0x8b0 fs/netfs/misc.c:25
 netfs_write_folio+0x1120/0x3050 fs/netfs/write_issue.c:421
 netfs_writepages+0xe60/0x1670 fs/netfs/write_issue.c:541
 do_writepages+0x427/0xc30 mm/page-writeback.c:2683
 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:398
 __filemap_fdatawrite_range mm/filemap.c:431 [inline]
 file_write_and_wait_range+0x1b5/0x5d0 mm/filemap.c:788
 v9fs_file_fsync+0x93/0x1d0 fs/9p/vfs_file.c:418
 vfs_fsync_range+0x1f9/0x260 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2871 [inline]
 netfs_file_write_iter+0x6ca/0x7b0 fs/netfs/buffered_write.c:487
 v9fs_file_write_iter+0x107/0x140 fs/9p/vfs_file.c:407
 iter_file_splice_write+0x122d/0x1da0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x337/0x7f0 fs/splice.c:1164
 splice_direct_to_actor+0x946/0x1430 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1fd/0x340 fs/splice.c:1233
 do_sendfile+0x9b6/0x19b0 fs/read_write.c:1388
 __do_sys_sendfile64 fs/read_write.c:1455 [inline]
 __se_sys_sendfile64+0x1f5/0x280 fs/read_write.c:1441
 __x64_sys_sendfile64+0xbd/0x110 fs/read_write.c:1441
 x64_sys_call+0x1092/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:41
 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

CPU: 1 UID: 0 PID: 3978 Comm: kworker/u8:22 Not tainted 6.11.0-syzkaller-11624-ge477dba5442c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound netfs_write_collection_worker
=====================================================