=====================================================
BUG: KMSAN: uninit-value in native_apic_mem_write+0x6e/0x90 arch/x86/include/asm/apic.h:107
CPU: 0 PID: 20848 Comm: syz-executor.4 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:201
 native_apic_mem_write+0x6e/0x90 arch/x86/include/asm/apic.h:107
 apic_eoi arch/x86/include/asm/apic.h:408 [inline]
 ack_APIC_irq arch/x86/include/asm/apic.h:454 [inline]
 __sysvec_reschedule_ipi arch/x86/kernel/smp.c:227 [inline]
 sysvec_reschedule_ipi+0x7f/0x1c0 arch/x86/kernel/smp.c:225
 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:sock_rfree+0x208/0x2c0 net/core/sock.c:2144
Code: d7 fe ff ff 8b 3a e8 e7 34 1d f6 e9 e5 fe ff ff 8b 3a e8 db 34 1d f6 4d 85 ff 0f 85 fd fe ff ff e8 cd 37 a1 f5 48 83 c4 18 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 8b 7d d0 e8 b6 34 1d f6 e9 f0 fe ff
RSP: 0018:ffff88811c15f648 EFLAGS: 00000292
RAX: ffffffff8c11d083 RBX: ffff888111a82a18 RCX: 0000000000040000
RDX: ffffc9000fea0000 RSI: 000000000000aabd RDI: 000000000000aabe
RBP: ffff88811c15f668 R08: ffffea000000000f R09: ffff88813fffa000
R10: 0000000000000002 R11: 00000000ffffffff R12: 0000000000000000
R13: 0000000000002100 R14: 0000000000000000 R15: 0000000000000000
 netlink_skb_destructor+0x1a7/0x310 net/netlink/af_netlink.c:372
 skb_release_head_state+0x1c5/0x430 net/core/skbuff.c:651
 skb_release_all net/core/skbuff.c:662 [inline]
 __kfree_skb+0x3e/0x320 net/core/skbuff.c:678
 consume_skb+0xd1/0x370 net/core/skbuff.c:838
 skb_free_datagram+0x52/0x190 net/core/datagram.c:325
 netlink_recvmsg+0xf4b/0x1c30 net/netlink/af_netlink.c:1998
 sock_recvmsg_nosec net/socket.c:885 [inline]
 ____sys_recvmsg+0xb15/0xcd0 net/socket.c:2574
 ___sys_recvmsg net/socket.c:2618 [inline]
 do_recvmmsg+0xeb9/0x22e0 net/socket.c:2708
 __sys_recvmmsg+0x3de/0x5f0 net/socket.c:2797
 __do_compat_sys_recvmmsg_time32 net/compat.c:419 [inline]
 __se_compat_sys_recvmmsg_time32+0xfb/0x120 net/compat.c:415
 __ia32_compat_sys_recvmmsg_time32+0x62/0x80 net/compat.c:415
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fa8549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55a20cc EFLAGS: 00000296 ORIG_RAX: 0000000000000151
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200037c0
RDX: 00000000000003b4 RSI: 0000000000000000 RDI: 0000000020003700
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----regs@__bpf_prog_run32 created at:
 __bpf_prog_run32+0x84/0x190 kernel/bpf/core.c:1692
 __bpf_prog_run32+0x84/0x190 kernel/bpf/core.c:1692
=====================================================