=====================================================
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]
 __filemap_fdatawrite mm/filemap.c:437 [inline]
 filemap_fdatawrite+0xbf/0xf0 mm/filemap.c:442
 v9fs_vfs_setattr+0xbc6/0x14b0 fs/9p/vfs_inode.c:1037
 notify_change+0x1a8e/0x1b80 fs/attr.c:503
 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x8c1/0xbf0 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_compat_sys_ftruncate fs/open.c:213 [inline]
 __se_compat_sys_ftruncate fs/open.c:211 [inline]
 __ia32_compat_sys_ftruncate+0x157/0x290 fs/open.c:211
 ia32_sys_call+0x2482/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:94
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 3114 Comm: kworker/u8:11 Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound netfs_write_collection_worker
=====================================================