syzbot

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BUG: KMSAN: uninit-value in xfrm_user_rcv_msg_compat+0x8bc/0x1e90 net/xfrm/xfrm_compat.c:569
 xfrm_user_rcv_msg_compat+0x8bc/0x1e90 net/xfrm/xfrm_compat.c:569
 xfrm_user_rcv_msg+0x4a2/0xfa0 net/xfrm/xfrm_user.c:2774
 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2504
 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2824
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x107b/0x1350 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x1734/0x17c0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2337
 ___sys_sendmsg net/socket.c:2391 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2420
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:145
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:170
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:213
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable ----attrs@xfrm_user_rcv_msg_compat created at:
 xfrm_user_rcv_msg_compat+0xf0/0x1e90 net/xfrm/xfrm_compat.c:546
 xfrm_user_rcv_msg+0x4a2/0xfa0 net/xfrm/xfrm_user.c:2774
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 0 PID: 19335 Comm: syz-executor.5 Tainted: G    B             5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x25a/0x2f6 lib/dump_stack.c:120
 panic+0x4c7/0xe98 kernel/panic.c:231
 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186
 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208
 xfrm_user_rcv_msg_compat+0x8bc/0x1e90 net/xfrm/xfrm_compat.c:569
 xfrm_user_rcv_msg+0x4a2/0xfa0 net/xfrm/xfrm_user.c:2774
 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2504
 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2824
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x107b/0x1350 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x1734/0x17c0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2337
 ___sys_sendmsg net/socket.c:2391 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2420
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:145
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:170
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:213
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf6ece549
Code: 03 74 c0 01 10 05 03 74 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 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f44c85fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000280
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess):
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi