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BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline]
BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:330 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xef3/0x33f0 lib/iov_iter.c:197
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 copy_to_user_iter lib/iov_iter.c:24 [inline]
 iterate_ubuf include/linux/iov_iter.h:30 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 _copy_to_iter+0xef3/0x33f0 lib/iov_iter.c:197
 copy_to_iter include/linux/uio.h:220 [inline]
 simple_copy_to_iter net/core/datagram.c:521 [inline]
 __skb_datagram_iter+0x196/0x12c0 net/core/datagram.c:402
 skb_copy_datagram_iter+0x5b/0x1e0 net/core/datagram.c:535
 skb_copy_datagram_msg include/linux/skbuff.h:4217 [inline]
 netlink_recvmsg+0x4bb/0xfe0 net/netlink/af_netlink.c:1953
 sock_recvmsg_nosec net/socket.c:1069 [inline]
 sock_recvmsg+0x2df/0x390 net/socket.c:1091
 __sys_recvfrom+0x282/0x550 net/socket.c:2272
 __do_sys_recvfrom net/socket.c:2287 [inline]
 __se_sys_recvfrom net/socket.c:2283 [inline]
 __x64_sys_recvfrom+0x130/0x200 net/socket.c:2283
 x64_sys_call+0x3227/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:46
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4985 [inline]
 slab_alloc_node mm/slub.c:5288 [inline]
 __do_kmalloc_node mm/slub.c:5649 [inline]
 __kmalloc_node_track_caller_noprof+0xb4b/0x1ba0 mm/slub.c:5759
 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:601
 __alloc_skb+0x33e/0xc10 net/core/skbuff.c:670
 alloc_skb include/linux/skbuff.h:1383 [inline]
 netlink_dump+0x24f/0x17d0 net/netlink/af_netlink.c:2292
 __netlink_dump_start+0x716/0xd60 net/netlink/af_netlink.c:2442
 netlink_dump_start include/linux/netlink.h:341 [inline]
 rtnetlink_dump_start net/core/rtnetlink.c:6849 [inline]
 rtnetlink_rcv_msg+0x1262/0x14b0 net/core/rtnetlink.c:6916
 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2552
 rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6978
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:733
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2608
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2662
 __sys_sendmsg net/socket.c:2694 [inline]
 __do_sys_sendmsg net/socket.c:2699 [inline]
 __se_sys_sendmsg net/socket.c:2697 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2697
 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Bytes 32-35 of 44 are uninitialized
Memory access of size 44 starts at ffff88804db3a000
Data copied to user address 00007fd8a505e010

CPU: 1 UID: 0 PID: 10540 Comm: syz.3.1513 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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