syzbot

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BUG: KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 ____sys_sendmsg+0x222/0xb60 net/socket.c:2565
 __sys_sendmsg_sock+0x42/0x60 net/socket.c:2669
 io_sendmsg+0x36a/0xe30 io_uring/net.c:550
 io_issue_sqe+0x383/0x22c0 io_uring/io_uring.c:1721
 io_queue_sqe io_uring/io_uring.c:1935 [inline]
 io_submit_sqe io_uring/io_uring.c:2191 [inline]
 io_submit_sqes+0x1259/0x2f20 io_uring/io_uring.c:2306
 __do_sys_io_uring_enter io_uring/io_uring.c:3325 [inline]
 __se_sys_io_uring_enter+0x406/0x41c0 io_uring/io_uring.c:3261
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3261
 ia32_sys_call+0x2d8f/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:427
 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

Uninit was stored to memory at:
 io_sendmsg+0x691/0xe30 io_uring/net.c:548
 io_issue_sqe+0x383/0x22c0 io_uring/io_uring.c:1721
 io_queue_sqe io_uring/io_uring.c:1935 [inline]
 io_submit_sqe io_uring/io_uring.c:2191 [inline]
 io_submit_sqes+0x1259/0x2f20 io_uring/io_uring.c:2306
 __do_sys_io_uring_enter io_uring/io_uring.c:3325 [inline]
 __se_sys_io_uring_enter+0x406/0x41c0 io_uring/io_uring.c:3261
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3261
 ia32_sys_call+0x2d8f/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:427
 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

Uninit was created at:
 __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4725
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page mm/slub.c:2319 [inline]
 allocate_slab+0x203/0x1220 mm/slub.c:2482
 new_slab mm/slub.c:2535 [inline]
 ___slab_alloc+0x12ef/0x35e0 mm/slub.c:3721
 __kmem_cache_alloc_bulk mm/slub.c:4763 [inline]
 kmem_cache_alloc_bulk_noprof+0x486/0x1330 mm/slub.c:4835
 __io_alloc_req_refill+0x84/0x560 io_uring/io_uring.c:951
 io_alloc_req io_uring/io_uring.h:398 [inline]
 io_submit_sqes+0x171b/0x2f20 io_uring/io_uring.c:2295
 __do_sys_io_uring_enter io_uring/io_uring.c:3325 [inline]
 __se_sys_io_uring_enter+0x406/0x41c0 io_uring/io_uring.c:3261
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3261
 ia32_sys_call+0x2d8f/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:427
 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: 0 UID: 0 PID: 13367 Comm: syz.4.2274 Not tainted 6.11.0-syzkaller-04003-gfc1dc0d50780 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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