bryancall opened a new pull request #6751:
URL: https://github.com/apache/trafficserver/pull/6751
Sample output:
```
12:39:45 bart:(futex_script)~/dev/apache/trafficserver/tools$ sudo
./gdb_mutex_contention.pl -f ~/futexes.out
Running gdb over binary: /usr/local/bin/traffic_server and pid: 274016
lock: [ET_NET 3][274016] lock 0xf4dbe0 contended 2390 times, 22365 avg us -
total wait: 53452350
#0 0x00007fadae90dea3 in __GI___pthread_mutex_lock (mutex=0xf4dbe0) at
../nptl/pthread_mutex_lock.c:80
#1 0x00007fadaef14e77 in ink_mutex_acquire (m=0xf4dbe0) at
../../include/tscore/ink_mutex.h:48
#2 0x00007fadaef14fdc in Diags::lock (this=0xf4db40) at
../../include/tscore/Diags.h:256
#3 0x00007fadaef139d2 in Diags::print_va (this=0xf4db40,
debug_tag=0x0, diags_level=DL_Error, loc=0x51a9390, format_string=0x9b8078
"HTTP/2 connection error code=0x%02x client_ip=%s session_id=%ld stream_id=%u
%s", ap=0x51a91d8) at Diags.cc:250
#4 0x00007fadaef141a7 in Diags::error_va (this=0xf4db40,
level=DL_Error, loc=0x51a9390, format_string=0x9b8078 "HTTP/2 connection error
code=0x%02x client_ip=%s session_id=%ld stream_id=%u %s", ap=0x51a91d8) at
Diags.cc:469
#5 0x00000000006682eb in Diags::error (this=0xf4db40, level=DL_Error,
loc=0x51a9390, fmt=0x9b8078 "HTTP/2 connection error code=0x%02x client_ip=%s
session_id=%ld stream_id=%u %s") at ../include/tscore/Diags.h:207
#6 0x00000000007bdb48 in Http2ConnectionState::main_event_handler
(this=0x7fad540ed0e8, event=2253, edata=0x51a9680) at
Http2ConnectionState.cc:1070
#7 0x000000000066c7ef in Continuation::handleEvent
(this=0x7fad540ed0e8, event=2253, data=0x51a9680) at
/home/bcall/dev/apache/trafficserver/iocore/eventsystem/I_Continuation.h:190
#8 0x00000000007b043e in send_connection_event (cont=0x7fad540ed0e8,
event=2253, edata=0x51a9680) at Http2ClientSession.cc:65
#9 0x00000000007b3925 in Http2ClientSession::do_complete_frame_read
(this=0x7fad540ecde0) at Http2ClientSession.cc:577
#10 0x00000000007b3ef0 in Http2ClientSession::state_process_frame_read
```
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