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BUG: KMSAN: uninit-value in kick_process+0x12a/0x180 kernel/sched/core.c:1426
CPU: 0 PID: 10917 Comm: udevd Not tainted 4.17.0-rc5+ #101
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
 kick_process+0x12a/0x180 kernel/sched/core.c:1426
 set_notify_resume include/linux/tracehook.h:165 [inline]
 task_work_add+0x2cc/0x300 kernel/task_work.c:40
 fput+0x146/0x2e0 fs/file_table.c:270
 filp_close+0x287/0x2e0 fs/open.c:1176
 __close_fd+0x47b/0x4d0 fs/file.c:635
 __do_sys_close fs/open.c:1189 [inline]
 __se_sys_close fs/open.c:1187 [inline]
 __x64_sys_close+0x90/0x160 fs/open.c:1187
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f47734a92b0
RSP: 002b:00007ffc5d8700f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000e61250 RCX: 00007f47734a92b0
RDX: 00007ffc5d873350 RSI: 0000000000000002 RDI: 0000000000000007
RBP: 0000000000625500 R08: 0000000000000001 R09: 000000000006d980
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc5d8701d0
R13: 0000000000000001 R14: 00007ffc5d870164 R15: 0000000000e61250

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529
 __set_task_cpu kernel/sched/sched.h:1296 [inline]
 set_task_cpu+0x6e2/0x7c0 kernel/sched/core.c:1180
 try_to_wake_up+0xe6e/0x2090 kernel/sched/core.c:2046
 default_wake_function+0x92/0xb0 kernel/sched/core.c:3745
 __wake_up_common kernel/sched/wait.c:90 [inline]
 __wake_up_locked+0x216/0x370 kernel/sched/wait.c:152
 ep_poll_callback+0xd7c/0x11c0 fs/eventpoll.c:1197
 __wake_up_common+0x44f/0xa60 kernel/sched/wait.c:90
 __wake_up_common_lock+0x196/0x370 kernel/sched/wait.c:119
 __wake_up_sync_key+0xcf/0x120 kernel/sched/wait.c:197
 pipe_release+0x2cc/0x5a0 fs/pipe.c:571
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979
 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Local variable description: ----wait.i@do_epoll_wait
Variable was created at:
 do_epoll_wait+0x10c/0x17c0 fs/eventpoll.c:2158
 __do_sys_epoll_wait fs/eventpoll.c:2201 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2198 [inline]
 __x64_sys_epoll_wait+0x116/0x170 fs/eventpoll.c:2198
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