Triggered with pv /proc/profile after a ~30s system-wide profile.

[Profiler(161:161)]: KUBSAN: member call on null pointer of type 'struct KString'
[Profiler(161:161)]: KUBSAN: at /Users/andrewpiroli/work/serenity/Kernel/PerformanceEventBuffer.cpp, line 210, column: 13
[Profiler(161:161)]: Kernel + 0x00000000014e8e48  print_location +0x208
[Profiler(161:161)]: Kernel + 0x00000000014ed0b8  __ubsan_handle_type_mismatch_v1 +0x218
[Profiler(161:161)]: Kernel + 0x0000000001046dad  AK::ErrorOr<void, AK::Error> Kernel::PerformanceEventBuffer::to_json_impl<AK::JsonObjectSerializer<Kernel::KBufferBuilder> >(AK::JsonObjectSerializer<Kernel::KBufferBuilder>&) const +0x98cd
[Profiler(161:161)]: Kernel + 0x0000000001036f84  Kernel::PerformanceEventBuffer::to_json(Kernel::KBufferBuilder&) const +0xf4
[Profiler(161:161)]: Kernel + 0x0000000000664f3f  Kernel::ProcFSProfile::try_generate(Kernel::KBufferBuilder&) +0x6f
[Profiler(161:161)]: Kernel + 0x00000000010ceab8  Kernel::ProcFSGlobalInformation::refresh_data(Kernel::OpenFileDescription&) const [clone .localalias] +0xbf8
[Profiler(161:161)]: Kernel + 0x0000000000b90a81  Kernel::ProcFSGlobalInode::attach(Kernel::OpenFileDescription&) [clone .localalias] +0x131
[Profiler(161:161)]: Kernel + 0x0000000000b17b47  Kernel::OpenFileDescription::attach() [clone .localalias] +0x3b7
[Profiler(161:161)]: Kernel + 0x0000000000b32fbc  Kernel::OpenFileDescription::try_create(Kernel::Custody&) +0x90c
[Profiler(161:161)]: Kernel + 0x0000000000c64626  Kernel::VirtualFileSystem::open(AK::StringView, int, unsigned short, Kernel::Custody&, AK::Optional<Kernel::UidAndGid>) +0xce6
[Profiler(161:161)]: Kernel + 0x000000000127e6d9  Kernel::Process::sys$open(AK::Userspace<Kernel::Syscall::SC_open_params const*>) +0x1359
[Profiler(161:161)]: Kernel + 0x0000000001158148  syscall_handler +0x1148
[Profiler(161:161)]: Kernel + 0x000000000156d391  syscall_entry +0x51
[Profiler(161:161)]: UB is configured to be deadly, halting the system.```