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BUG: KMSAN: uninit-value in arch_uprobe_exception_notify+0x20f/0x220 arch/x86/kernel/uprobes.c:1009
CPU: 1 PID: 10187 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: 0000:ffff8801a0bafc98 EFLAGS: 00010202
RAX: ffff88013fe5b700 RBX: ffff88013fe53701 RCX: ffff880000000000
RDX: ffff88013fa53704 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801a0bafce8 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88013fe52618 R14: ffff88013fe53704 R15: 0000000000000000
 fpu__clear+0x56/0x2f0 arch/x86/kernel/fpu/core.c:388
 handle_signal arch/x86/kernel/signal.c:761 [inline]
 do_signal+0x168a/0x1c80 arch/x86/kernel/signal.c:812
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 retint_user+0x8/0x8
RIP: 0033:0x402040
RSP: 002b:0000000000a3e378 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000a3e380 RSI: 0000000000a3e4b0 RDI: 000000000000000b
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000730370
R10: 0000000000a3e940 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 0000000000025135

Local variable description: ----env.i@copy_fpstate_to_sigframe
Variable was created at:
 copy_fpstate_to_sigframe+0x6d/0x980 arch/x86/kernel/fpu/signal.c:158
 get_sigframe arch/x86/kernel/signal.c:285 [inline]
 __setup_rt_frame arch/x86/kernel/signal.c:466 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:700 [inline]
 handle_signal arch/x86/kernel/signal.c:744 [inline]
 do_signal+0xbe4/0x1c80 arch/x86/kernel/signal.c:812
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