syzbot

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BUG: KMSAN: uninit-value in ocfs2_file_read_iter+0x9a4/0xf80 fs/ocfs2/file.c:2584
 ocfs2_file_read_iter+0x9a4/0xf80 fs/ocfs2/file.c:2584
 io_iter_do_read io_uring/rw.c:771 [inline]
 __io_read+0x8d2/0x20f0 io_uring/rw.c:865
 io_read+0x3e/0xf0 io_uring/rw.c:943
 io_issue_sqe+0x429/0x22c0 io_uring/io_uring.c:1739
 io_wq_submit_work+0xaf9/0xdc0 io_uring/io_uring.c:1848
 io_worker_handle_work+0xd11/0x2110 io_uring/io-wq.c:601
 io_wq_worker+0x447/0x1410 io_uring/io-wq.c:655
 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:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4756
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2345
 alloc_slab_page mm/slub.c:2412 [inline]
 allocate_slab+0x33a/0x1250 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0x12ef/0x35e0 mm/slub.c:3818
 __kmem_cache_alloc_bulk mm/slub.c:4895 [inline]
 kmem_cache_alloc_bulk_noprof+0x486/0x1330 mm/slub.c:4967
 __io_alloc_req_refill+0x84/0x560 io_uring/io_uring.c:969
 io_alloc_req io_uring/io_uring.h:406 [inline]
 io_submit_sqes+0x172f/0x2f30 io_uring/io_uring.c:2313
 __do_sys_io_uring_enter io_uring/io_uring.c:3343 [inline]
 __se_sys_io_uring_enter+0x406/0x41c0 io_uring/io_uring.c:3279
 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3279
 x64_sys_call+0x2b54/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:427
 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: 0 UID: 0 PID: 5188 Comm: iou-wrk-5184 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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