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https://issues.apache.org/jira/browse/TS-3248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14254394#comment-14254394
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Qiang Li commented on TS-3248:
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thank you, i will test the above patch :)
> 5.2.0 Segmentation fault
> ------------------------
>
> Key: TS-3248
> URL: https://issues.apache.org/jira/browse/TS-3248
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Affects Versions: 5.2.0
> Reporter: Qiang Li
> Assignee: Sudheer Vinukonda
> Priority: Blocker
> Labels: crash
> Fix For: 5.2.0
>
>
> Segmentation fault sometime
> {code}
> (gdb) bt
> #0 0x000000000073334a in operator IOBufferBlock* (nh=0x2b4d9e1e8b50,
> vc=0x2aaac11114d0, thread=0x2b4d9e1e5010) at ../../lib/ts/Ptr.h:326
> #1 first_write_block (nh=0x2b4d9e1e8b50, vc=0x2aaac11114d0,
> thread=0x2b4d9e1e5010) at ../../iocore/eventsystem/I_IOBuffer.h:920
> #2 read_from_net (nh=0x2b4d9e1e8b50, vc=0x2aaac11114d0,
> thread=0x2b4d9e1e5010) at UnixNetVConnection.cc:244
> #3 0x0000000000727a62 in NetHandler::mainNetEvent (this=0x2b4d9e1e8b50,
> event=<value optimized out>, e=<value optimized out>) at UnixNet.cc:399
> #4 0x00000000007538f5 in handleEvent (this=0x2b4d9e1e5010, e=0x2b4d9f806d80,
> calling_code=5) at I_Continuation.h:146
> #5 EThread::process_event (this=0x2b4d9e1e5010, e=0x2b4d9f806d80,
> calling_code=5) at UnixEThread.cc:144
> #6 0x000000000075404b in EThread::execute (this=0x2b4d9e1e5010) at
> UnixEThread.cc:268
> #7 0x0000000000752d3a in spawn_thread_internal (a=0x157a1b0) at Thread.cc:88
> #8 0x00002b4d9b0fa9d1 in start_thread () from /lib64/libpthread.so.0
> #9 0x00002b4d9c0f19dd in clone () from /lib64/libc.so.6
> (gdb) f 2
> #2 read_from_net (nh=0x2b4d9e1e8b50, vc=0x2aaac11114d0,
> thread=0x2b4d9e1e5010) at UnixNetVConnection.cc:244
> 244 IOBufferBlock *b = buf.writer()->first_write_block();
> (gdb) l
> 239 // read data
> 240 int64_t rattempted = 0, total_read = 0;
> 241 int niov = 0;
> 242 IOVec tiovec[NET_MAX_IOV];
> 243 if (toread) {
> 244 IOBufferBlock *b = buf.writer()->first_write_block();
> 245 do {
> 246 niov = 0;
> 247 rattempted = 0;
> 248 while (b && niov < NET_MAX_IOV) {
> (gdb) p buf
> $1 = (MIOBufferAccessor &) @0x2aaac1111608: {mbuf = 0x0, entry = 0x0}
> (gdb) p toread
> $2 = 7768
> (gdb)
> {code}
> at line 244 ,mbuf = 0x0, so buf.writer() return NULL
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