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BUG: KMSAN: uninit-value in arch_uprobe_exception_notify+0x20f/0x220 arch/x86/kernel/uprobes.c:1009
CPU: 0 PID: 12119 Comm: syz-executor0 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
 arch_uprobe_exception_notify+0x20f/0x220 arch/x86/kernel/uprobes.c:1009
 notifier_call_chain kernel/notifier.c:93 [inline]
 __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
 atomic_notifier_call_chain kernel/notifier.c:193 [inline]
 notify_die+0x247/0x3e0 kernel/notifier.c:549
 math_error+0x150/0x600 arch/x86/kernel/traps.c:840
 do_coprocessor_error+0x29/0x30 arch/x86/kernel/traps.c:876
 coprocessor_error+0x14/0x20 arch/x86/entry/entry_64.S:999
RIP: 0010:fpu__drop+0x27f/0x4f0 arch/x86/kernel/fpu/core.c:345
RSP: 0018:ffff8801c2cbfc90 EFLAGS: 00010202
RAX: ffff8801aac49900 RBX: ffff88019e5c1901 RCX: ffff880000000000
RDX: ffff8801afc219c4 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801c2cbfce0 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88019e5c08d8 R14: ffff88019e5c19c4 R15: 0000000000000000
 fpu__clear+0x56/0x2f0 arch/x86/kernel/fpu/core.c:388
 __fpu__restore_sig arch/x86/kernel/fpu/signal.c:361 [inline]
 fpu__restore_sig+0x1015/0x13b0 arch/x86/kernel/fpu/signal.c:388
 restore_sigcontext arch/x86/kernel/signal.c:153 [inline]
 __ia32_sys_rt_sigreturn+0x7fe/0xc90 arch/x86/kernel/signal.c:654
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0003:          (null)
RSP: 0003:0000000000000000 EFLAGS: 00000bd7
RAX: 00000000004080e8 RBX: 00007fd48b0ff9c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 0000000000a3e81f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 229526be4080d200 R14: 0000000000000000 R15: 000000000072bea0

Local variable description: ----rt_waiter.i125@do_futex
Variable was created at:
 do_futex+0x181/0x6ad0 kernel/futex.c:3499
 __do_sys_futex kernel/futex.c:3587 [inline]
 __se_sys_futex+0x3fe/0x820 kernel/futex.c:3555
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