syzbot

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WARNING: CPU: 0 PID: 22020 at ./arch/x86/include/asm/fpu/internal.h:535 __fpregs_activate arch/x86/include/asm/fpu/internal.h:535 [inline]()
WARNING: CPU: 0 PID: 22020 at ./arch/x86/include/asm/fpu/internal.h:535 fpregs_activate arch/x86/include/asm/fpu/internal.h:566 [inline]()
WARNING: CPU: 0 PID: 22020 at ./arch/x86/include/asm/fpu/internal.h:535 fpu__restore+0x26f/0x2f0 arch/x86/kernel/fpu/core.c:370()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 22020 Comm: syz-executor3 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ecb62f9e229c4c53 ffff8801d700fa98 ffffffff81d0408d
 ffffffff83843b40 ffff8801d700fb70 ffffffff8380ee80 0000000000000009
 0000000000000217 ffff8801d700fb60 ffffffff8141ab2a 0000000041b58ab3
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141ab2a>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff8112d885>] warn_slowpath_common+0x125/0x140 kernel/panic.c:455
 [<ffffffff8112dae9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff8102a37f>] __fpregs_activate arch/x86/include/asm/fpu/internal.h:535 [inline]
 [<ffffffff8102a37f>] fpregs_activate arch/x86/include/asm/fpu/internal.h:566 [inline]
 [<ffffffff8102a37f>] fpu__restore+0x26f/0x2f0 arch/x86/kernel/fpu/core.c:370
 [<ffffffff8102d515>] __fpu__restore_sig+0x435/0xac0 arch/x86/kernel/fpu/signal.c:324
 [<ffffffff8102e058>] fpu__restore_sig+0xd8/0x100 arch/x86/kernel/fpu/signal.c:362
 [<ffffffff8111a701>] ia32_restore_sigcontext+0x441/0x510 arch/x86/ia32/ia32_signal.c:108
 [<ffffffff8111b0b7>] sys32_rt_sigreturn+0x1b7/0x270 arch/x86/ia32/ia32_signal.c:156
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..