perf buffer not large enough
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4455 at kernel/trace/trace_event_perf.c:273 perf_trace_buf_alloc.cold+0x18/0x26 kernel/trace/trace_event_perf.c:273
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4455 Comm: syz-executor.3 Not tainted 4.14.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:perf_trace_buf_alloc.cold+0x18/0x26 kernel/trace/trace_event_perf.c:273
RSP: 0018:ffff8880a5e5fc80 EFLAGS: 00010286
RAX: 000000000000001c RBX: ffff88809c871800 RCX: 0000000000000000
RDX: 0000000000000c77 RSI: ffffffff8145da20 RDI: ffffed1014bcbf86
RBP: 0000000000209e54 R08: 000000000000001c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a5e5fd30
R13: ffff8880a5e5fd40 R14: ffff8880a5e5fd60 R15: 0000000000000000
 perf_trace_bpf_map_keyval+0x1b7/0x820 include/trace/events/bpf.h:228
 trace_bpf_map_update_elem include/trace/events/bpf.h:274 [inline]
 map_update_elem kernel/bpf/syscall.c:612 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1503 [inline]
 SyS_bpf+0x2350/0x35e0 kernel/bpf/syscall.c:1477
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45deb9
RSP: 002b:00007ff92392fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000001b40 RCX: 000000000045deb9
RDX: 0000000000000020 RSI: 0000000020000040 RDI: 0000000000000002
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe6a4c385f R14: 00007ff9239309c0 R15: 000000000118bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..