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Type: Bug
Resolution: Duplicate
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: Qt Creator 4.8.0-rc1
Component/s: C/C++/Obj-C++ Support
Labels:
None
Environment:
Ubuntu 18.04.1
Qt 5.12 rc
Qt Creator 5.8 rc

Platform/s:

Linux/X11

After installing Qt 5.12 rc with 4.8 rc Qt Creator and playing with Qt examples I got crash report on Ubuntu 18.04.1 with latest updates as of today. Since 7z crash file is too large to attach I am putting some peace of it here. If you need full file let me know where I can upload. Right now I am running Ubuntu 18.04.1 in Parallels 14 VM.

ProblemType: Crash
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 23 15:26:49 2018
DistroRelease: Ubuntu 18.04
ExecutablePath: /opt/Qt/Tools/Preview/Qt Creator 4.8.0-rc1/libexec/qtcreator/clangbackend
ExecutableTimestamp: 1543005831
ProcCmdline: /opt/Qt/Tools/Preview/Qt\ Creator\ 4.8.0-rc1/libexec/qtcreator/clangbackend /tmp/QtCreator-EigLQF/ClangBackEnd-31930
ProcCwd: /home/oxoocoffee
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
ProcMaps:
 00400000-004a5000 r-xp 00000000 08:01 3933524                            /opt/Qt/Tools/Preview/Qt Creator 4.8.0-rc1/libexec/qtcreator/clangbackend
 006a5000-006a7000 r--p 000a5000 08:01 3933524                            /opt/Qt/Tools/Preview/Qt Creator 4.8.0-rc1/libexec/qtcreator/clangbackend
 006a7000-006a8000 rw-p 000a7000 08:01 3933524                            /opt/Qt/Tools/Preview/Qt Creator 4.8.0-rc1/libexec/qtcreator/clangbackend
 025b1000-026fb000 rw-p 00000000 00:00 0                                  [heap]
 7f7e00000000-7f7e01b4b000 rw-p 00000000 00:00 0
 7f7e01b4b000-7f7e04000000 ---p 00000000 00:00 0
 7f7e08000000-7f7e0c000000 rw-p 00000000 00:00 0
 7f7e0df57000-7f7e0df58000 ---p 00000000 00:00 0
 7f7e0df58000-7f7e0ef58000 rw-p 00000000 00:00 0




ProcStatus:
 Name:  clangbackend
 Umask: 0002
 State: D (disk sleep)
 Tgid:  31941
 Ngid:  0
 Pid:   31941
 PPid:  31930
 TracerPid: 0
 Uid:   1000    1000    1000    1000
 Gid:   1000    1000    1000    1000
 FDSize:    64
 Groups:    4 24 27 30 46 116 126 1000
 NStgid:    31941
 NSpid: 31941
 NSpgid:    1764
 NSsid: 1764
 VmPeak:      574636 kB
 VmSize:      504776 kB
 VmLck:        0 kB
 VmPin:        0 kB
 VmHWM:   244424 kB
 VmRSS:   240152 kB
 RssAnon:     139988 kB
 RssFile:     100164 kB
 RssShmem:         0 kB
 VmData:      191856 kB
 VmStk:      132 kB
 VmExe:      660 kB
 VmLib:   108320 kB
 VmPTE:      828 kB
 VmSwap:           0 kB
 HugetlbPages:         0 kB
 CoreDumping:   1
 Threads:   3
 SigQ:  0/23585
 SigPnd:    0000000000000000
 ShdPnd:    0000000000000000
 SigBlk:    0000000000000000
 SigIgn:    0000000001000000
 SigCgt:    0000000180000000
 CapInh:    0000000000000000
 CapPrm:    0000000000000000
 CapEff:    0000000000000000
 CapBnd:    0000003fffffffff
 CapAmb:    0000000000000000
 NoNewPrivs:    0
 Seccomp:   0
 Speculation_Store_Bypass:  vulnerable
 Cpus_allowed:  ffffffff
 Cpus_allowed_list: 0-31
 Mems_allowed:  00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
 Mems_allowed_list: 0
 voluntary_ctxt_switches:   1027
 nonvoluntary_ctxt_switches:    28
Signal: 11
Uname: Linux 4.15.0-39-generic x86_64
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
CoreDump: base64
 H4sICAAAAAAC/0NvcmVEdW1wAA==


ApportVersion: 2.20.9-0ubuntu7.5
Disassembly:
 => 0x7f7e204c0345 <clang_getNumCompletionChunks+5>:    movzwl (%rdi),%eax
    0x7f7e204c0348 <clang_getNumCompletionChunks+8>:    retq
    0x7f7e204c0349 <clang_getNumCompletionChunks+9>:    nopl   0x0(%rax)
    0x7f7e204c0350 <clang_getNumCompletionChunks+16>:   xor    %eax,%eax
    0x7f7e204c0352 <clang_getNumCompletionChunks+18>:   retq
    0x7f7e204c0353: nopw   %cs:0x0(%rax,%rax,1)
    0x7f7e204c035d: nopl   (%rax)
    0x7f7e204c0360 <clang_getCompletionPriority>:   test   %rdi,%rdi
    0x7f7e204c0363 <clang_getCompletionPriority+3>: mov    $0x50,%eax
    0x7f7e204c0368 <clang_getCompletionPriority+8>: je     0x7f7e204c036e <clang_getCompletionPriority+14>
    0x7f7e204c036a <clang_getCompletionPriority+10>:    movzwl 0x4(%rdi),%eax
    0x7f7e204c036e <clang_getCompletionPriority+14>:    repz retq
    0x7f7e204c0370 <clang_getCompletionAvailability>:   test   %rdi,%rdi
    0x7f7e204c0373 <clang_getCompletionAvailability+3>: je     0x7f7e204c0380 <clang_getCompletionAvailability+16>
    0x7f7e204c0375 <clang_getCompletionAvailability+5>: movzbl 0x6(%rdi),%eax
    0x7f7e204c0379 <clang_getCompletionAvailability+9>: and    $0x3,%eax
InstallationDate: Installed on 2018-10-31 (23 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
JournalErrors:
 -- Logs begin at Tue 2018-10-30 20:51:30 CDT, end at Fri 2018-11-23 15:37:46 CST. --
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): Modeline "1024x768"x59.9   64.20  1024 1077 1183 1342  768 771 775 798 -hsync +vsync (47.8 kHz UP)
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): Modeline "800x600"x60.0   38.31  800 832 912 1024  600 603 607 624 -hsync +vsync (37.4 kHz)
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): Modeline "640x480"x59.9   23.98  640 657 720 800  480 483 487 500 -hsync +vsync (30.0 kHz)
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual2
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual3
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual4
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual5
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual6
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual7
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual8
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual9
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual10
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual11
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual12
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual13
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual14
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual15
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): EDID for output Virtual16
 Nov 23 14:41:09 vm-ros-18-04 /usr/lib/gdm3/gdm-x-session[1403]: (II) PRLVIDEO(0): Output Virtual1 connected

duplicates

QTCREATORBUG-21559 Clangbackend: heap-use-after-free when doing completion/reparsing

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