[TS-4232] Crash in HostDB，During debug message generating

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: HostDB
• Labels: crash
• Assignee: Thomas Jackson
• Reporter: Chao Xu
• Created: 26/Feb/16 09:03
• Updated: 07/Nov/16 23:25
• Resolved: 28/Jun/16 01:49

Description

STACK TRACE：

/usr/bin/traffic_server(crash_logger_invoke(int, siginfo_t*, void*)+0xa2)[0x7fec78d2cf52]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7fec76cfb8d0]
/usr/bin/traffic_server(+0x2acc5f)[0x7fec78edec5f]
/usr/bin/traffic_server(HostDBContinuation::dnsEvent(int, HostEnt*)+0x370)[0x7fec78ee3130]
/usr/bin/traffic_server(DNSEntry::postEvent(int, Event*)+0x4b)[0x7fec78ec8feb]
/usr/bin/traffic_server(EThread::process_event(Event*, int)+0x90)[0x7fec78fa4ee0]
/usr/bin/traffic_server(EThread::execute()+0x67f)[0x7fec78fa5aef]
/usr/bin/traffic_server(+0x3722da)[0x7fec78fa42da]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7fec76cf40a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fec75ca204d]
Segmentation fault (core dumped)

gdb with core file

Core was generated by `/usr/bin/traffic_server'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fec78edec5f in reply_to_cont (is_srv=false, r=0x7fec718beec0, cont=0x7fec6d375a10) at HostDB.cc:612

612         Debug("hostdb", "RR of %d with %d good, 1st IP = %s", r->rr()->rrcount, r->rr()->good, ats_ip_ntop(r->ip(), ipb, sizeof ipb))
(gdb) bt
#0  0x00007fec78edec5f in reply_to_cont (is_srv=false, r=0x7fec718beec0, cont=0x7fec6d375a10) at HostDB.cc:612
#1  reply_to_cont (cont=0x7fec6d375a10, r=0x7fec718beec0, is_srv=false) at HostDB.cc:585
#2  0x00007fec78ee3130 in HostDBContinuation::dnsEvent (this=<optimized out>, event=<optimized out>, e=<optimized out>)
    at HostDB.cc:1682
#3  0x00007fec78ec8feb in handleEvent (data=<optimized out>, event=600, this=<optimized out>)
    at ../../iocore/eventsystem/I_Continuation.h:146
#4  DNSEntry::postEvent (this=0x7fec6d236b10) at DNS.cc:1267
#5  0x00007fec78fa4ee0 in handleEvent (data=0x7fec64164fe0, event=1, this=<optimized out>) at I_Continuation.h:146
#6  EThread::process_event (this=this@entry=0x7fec73e3f010, e=e@entry=0x7fec64164fe0, calling_code=1) at UnixEThread.cc:131
#7  0x00007fec78fa5aef in EThread::execute (this=0x7fec73e3f010) at UnixEThread.cc:182
#8  0x00007fec78fa42da in spawn_thread_internal (a=0x7fec7b6d1af0) at Thread.cc:86
#9  0x00007fec76cf40a4 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007fec75ca204d in clone () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) p r
$1 = (HostDBInfo *) 0x7fec718beec0
(gdb) p *r
Cannot access memory at address 0x7fec718beec0
(gdb) p ipb
$2 = "175.25.168.40\000\000\000p+\377x\354\177\000\000\366\377\377\377\000\000\000\000 \367\025d\354\177\000\000\240\234\243s\354\177"

Issue Links

• is related to: TS-4331 Hostdb consistency problems due to MultiCache