[LLVMbugs] [Bug 15684] New: recent clang "hangs" when scanning FreeBSD source code

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15684

            Bug ID: 15684
           Summary: recent clang "hangs" when scanning FreeBSD source code
           Product: clang
           Version: trunk
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: uspoerlein at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Hey, I'm running scans using ToT clang against FreeBSD's head 3 times a week,
results can be seen here: http://scan.freebsd.your.org/freebsd-head/

These run in a VM with 4 cores or so and usually take around 14-18h, as you can
see from the logfile timestamps (the runs start at midnight). The last run that
was ok used r177463 from March 20th, the next run using r177833 from March 24th
did not finish, I had to kill a couple of clang processes that we using up over
100h of hours of CPU.

The current run has 3 hanging clang instances and doesn't progress at all, top
snapshot:

% top -b 5
last pid: 24911;  load averages:  3.06,  3.02,  3.00  up 587+16:11:43   
09:46:16
84 processes:  5 running, 78 sleeping, 1 stopped

Mem: 213M Active, 7978M Inact, 1152M Wired, 233M Cache, 1237M Buf, 2306M Free
Swap: 4093M Total, 7848K Used, 4086M Free


  PID USERNAME  THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
90516 uqs         1 129   10 64740K 55444K CPU3    3 127.4H 100.00% clang
 1496 uqs         1 129   10 64740K 55508K CPU2    2 126.4H 100.00% clang
83115 uqs         1 128   10 48252K 39256K CPU1    0 127.7H 96.97% clang
  853 root        1  44    0 23236K  1284K select  1 683:00  0.00%
vmtoolsd-real
 1114 root        1  44    0 29312K  9492K select  1 386:26  0.00% bsnmpd


two of these are hung on scanning the nvi sources (these haven't changed in
quite some time)

% lsof|grep "clang.*freebsd-head"
clang      1496   uqs  cwd     VDIR               0,82               2560 
2756720 /usr/obj/data/src/freebsd-head/usr.bin/vi
clang      1496   uqs  txt     VREG               0,82              24421   
72763 /data/src/freebsd-head/contrib/nvi/vi/vs_refresh.c
clang      1496   uqs  txt     VREG               0,82              23106 
3358307 /data/src/freebsd-head/sys/sys/cdefs.h
clang      1496   uqs  txt     VREG               0,82              16774 
2735768 /usr/obj/data/src/freebsd-head/tmp/usr/include/stdio.h
clang     83115   uqs  cwd     VDIR               0,82                512 
2734730 /usr/obj/data/src/freebsd-head/sys/boot/userboot/ficl
clang     83115   uqs  txt     VREG               0,82              23106 
3358307 /data/src/freebsd-head/sys/sys/cdefs.h
clang     83115   uqs  txt     VREG               0,82              21844 
3452753 /data/src/freebsd-head/sys/sys/queue.h
clang     83115   uqs  txt     VREG               0,82              42931  
358839 /data/src/freebsd-head/sys/boot/ficl/ficl.h
clang     83115   uqs    3r    VREG               0,82               4717 
2735729 /usr/obj/data/src/freebsd-head/tmp/usr/include/limits.h
clang     90516   uqs  cwd     VDIR               0,82               2560 
3226716
/usr/obj/data/src/freebsd-head/rescue/rescue/data/src/freebsd-head/usr.bin/vi
clang     90516   uqs  txt     VREG               0,82              24421   
72763 /data/src/freebsd-head/contrib/nvi/vi/vs_refresh.c
clang     90516   uqs  txt     VREG               0,82              23106 
3358307 /data/src/freebsd-head/sys/sys/cdefs.h
clang     90516   uqs  txt     VREG               0,82              16774 
2735768 /usr/obj/data/src/freebsd-head/tmp/usr/include/stdio.h

What's a quick way to get a preprocessed file out of that?

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