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BUG: KMSAN: uninit-value in __do_sys_waitid kernel/exit.c:1619 [inline]
BUG: KMSAN: uninit-value in __se_sys_waitid+0x338/0xaa0 kernel/exit.c:1598
CPU: 1 PID: 13171 Comm: syz-executor2 Not tainted 4.18.0-rc8+ #34
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+0x17c/0x1c0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:982
 kmsan_internal_check_memory+0x17e/0x1f0 mm/kmsan/kmsan.c:1046
 kmsan_check_memory+0xb/0x10 mm/kmsan/kmsan.c:1053
 __do_sys_waitid kernel/exit.c:1619 [inline]
 __se_sys_waitid+0x338/0xaa0 kernel/exit.c:1598
 __x64_sys_waitid+0x15d/0x1b0 kernel/exit.c:1598
 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f905115bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f7
RAX: ffffffffffffffda RBX: 00007f905115c6d4 RCX: 0000000000457089
RDX: 0000000020000200 RSI: 0000000000000329 RDI: 0000000000000003
RBP: 0000000000930140 R08: 0000000020000240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d6e58 R14: 00000000004ca1b6 R15: 0000000000000001

Local variable description: ----__pu_val131.i@__se_sys_waitid
Variable was created at:
 __se_sys_waitid+0x15b/0xaa0 kernel/exit.c:1598
 0x2

Bytes 0-3 of 4 are uninitialized
Memory access starts at ffff8801173afd70
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