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Date:   Fri, 18 May 2018 03:29:01 -0700
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Subject: WARNING in tracepoint_probe_register_prio (3)
From:   syzbot <syzbot+774fddf07b7ab29a1e55@syzkaller.appspotmail.com>
To:     linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com,
        paulmck@linux.vnet.ibm.com, rostedt@goodmis.org,
        syzkaller-bugs@googlegroups.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    a78622932c27 bpf: sockmap, fix double-free
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1305ba77800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1
dashboard link: https://syzkaller.appspot.com/bug?extid=774fddf07b7ab29a1e55
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+774fddf07b7ab29a1e55@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 11734 at kernel/tracepoint.c:210 tracepoint_add_func  
kernel/tracepoint.c:210 [inline]
WARNING: CPU: 0 PID: 11734 at kernel/tracepoint.c:210  
tracepoint_probe_register_prio+0x3b4/0xa50 kernel/tracepoint.c:282
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 11734 Comm: syz-executor1 Not tainted 4.17.0-rc4+ #13
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+0x1b9/0x294 lib/dump_stack.c:113
  panic+0x22f/0x4de kernel/panic.c:184
  __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
  report_bug+0x252/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:tracepoint_add_func kernel/tracepoint.c:210 [inline]
RIP: 0010:tracepoint_probe_register_prio+0x3b4/0xa50 kernel/tracepoint.c:282
RSP: 0018:ffff8801c7977438 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff8801c7977518 RCX: ffffc900080f9000
RDX: 00000000000012a1 RSI: ffffffff817a9d34 RDI: ffff8801c29ddab0
RBP: ffff8801c7977540 R08: ffff880197448700 R09: fffffbfff11b803c
R10: ffff8801c7977428 R11: ffffffff88dc01e7 R12: 00000000ffffffef
R13: 00000000ffffffff R14: ffffffff81516c90 R15: 0000000000000001
  tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:303
  trace_event_reg+0x19a/0x350 kernel/trace/trace_events.c:305
  perf_trace_event_reg kernel/trace/trace_event_perf.c:123 [inline]
  perf_trace_event_init+0x4fe/0x990 kernel/trace/trace_event_perf.c:198
  perf_trace_init+0x186/0x250 kernel/trace/trace_event_perf.c:222
  perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8337
  perf_try_init_event+0x137/0x2f0 kernel/events/core.c:9734
  perf_init_event kernel/events/core.c:9772 [inline]
  perf_event_alloc.part.91+0x1248/0x3090 kernel/events/core.c:10038
  perf_event_alloc kernel/events/core.c:10394 [inline]
  __do_sys_perf_event_open+0xa8a/0x2fa0 kernel/events/core.c:10495
  __se_sys_perf_event_open kernel/events/core.c:10384 [inline]
  __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10384
  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f136b4f5c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f136b4f66d4 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002001d000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000014
R13: 000000000000050c R14: 00000000006fb9c0 R15: 0000000000000003
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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