Created
December 6, 2013 23:38
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Using DTrace to catch a really tricky bug in production
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| dtrace -n 'syscall::writev:entry /execname == "node" && arg2 > 3/ { printf("iovcnt: %d", arg2); }' -n 'syscall::writev:return /execname == "node" && arg1 == -1 && errno == 22/ { printf("%s %s %d\\n", curpsinfo->pr_psargs, probefunc, errno); jstack(100, 8000); }' | |
| dtrace: description 'syscall::writev:entry ' matched 1 probe | |
| dtrace: description 'syscall::writev:return ' matched 1 probe | |
| 1 10260 writev:entry iovcnt: 57 | |
| 1 10261 writev:return node --nouse-idle-notification /voxer/server/node_router/node_router.js /voxer/ writev 22\n | |
| libc.so.1`__writev+0x15 | |
| node`uv__write.part.5+0x18f | |
| node`uv_write2+0x1b9 | |
| node`uv_write+0x35 | |
| node`_ZN4node10StreamWrap6WritevERKN2v89ArgumentsE+0x678 | |
| node`_ZN2v88internalL21Builtin_HandleApiCallENS0_12_GLOBAL__N_116BuiltinArgumentsILNS0_21BuiltinExtraArgumentsE1EEEPNS0_7IsolateE+0x157 | |
| << internal code >> | |
| (anon) as Socket._write at net.js line 595 | |
| (anon) as Socket.writev at net.js line 557 | |
| afterConnect at net.js line 828 | |
| << internal >> | |
| << entry >> | |
| node`_ZN2v88internalL6InvokeEbNS0_6HandleINS0_10JSFunctionEEENS1_INS0_6ObjectEEEiPS5_Pb+0x101 | |
| node`_ZN2v88internal9Execution4CallENS0_6HandleINS0_6ObjectEEES4_iPS4_Pbb+0xc9 | |
| node`_ZN2v88Function4CallENS_6HandleINS_6ObjectEEEiPNS1_INS_5ValueEEE+0xf0 | |
| node`_ZN4node12MakeCallbackEN2v86HandleINS0_6ObjectEEENS1_INS0_8FunctionEEEiPNS1_INS0_5ValueEEE+0x11e | |
| node`_ZN4node12MakeCallbackEN2v86HandleINS0_6ObjectEEENS1_INS0_6StringEEEiPNS1_INS0_5ValueEEE+0x69 | |
| node`_ZN4node7TCPWrap12AfterConnectEP12uv_connect_si+0xff | |
| node`uv__stream_io+0xc9 | |
| node`ev_invoke_pending+0x63 | |
| node`uv__run+0x94 | |
| node`uv_run+0x17 | |
| node`_ZN4node5StartEiPPc+0x1c7 | |
| node`main+0x1b | |
| node`_start+0x83 |
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