Do anyone has any problem with sem_open() crash?

[Joe Marcus Clarke]

On Sun, 2006-10-22 at 20:09 -0500, Jeremy Messenger wrote:
> Hello folks,
> 
> Last night, I have upgraded from July RELENG_6 to last night. I have  
> reinstalled all of ports and I noticed that the log/messages is collecting  
> a few of 'pid 14699 (conftest), uid 0: exited on signal 12 (core dumped)'.  
> I dig in the configure and found a location of crash. It is from  
> sem_open(). I don't get that before I upgraded the RELENG_6.
> 
> http://people.freebsd.org/~mezz/test-sem_open.cc (took from configure's  
> conftest)
> 
> ===============================
> % c++ -o test-sem_open -O2 -fno-strict-aliasing -pipe -g -pthread -pipe  
> test-sem_open.cc
> % ./test-sem_open
> [1]    5761 invalid system call (core dumped)  ./test-sem_open
> 
> % grep sem_open /var/log/messages
> Oct 22 19:44:35 mezz kernel: pid 5761 (test-sem_open), uid 1001: exited on  
> signal 12 (core dumped)
> Oct 22 20:00:45 mezz kernel: pid 6140 (test-sem_open), uid 1001: exited on  
> signal 12 (core dumped)
> ===============================
> 
> I have decided to login in a jail that has RELENG_6 from July in the same  
> local machine that have most debug enable.
> 
> ===============================
> $ gdb test-sem_open test-sem_open.core
> 
> Core was generated by `test-sem_open'.
> Program terminated with signal 12, Bad system call.
> 
> #0  0x281bf297 in ksem_open () at ksem_open.S:2
> 2       ksem_open.S: No such file or directory.
>          in ksem_open.S
> [New LWP 100120]
> 
> 
> (gdb) bt
> #0  0x281bf297 in ksem_open () at ksem_open.S:2
> #1  0x281b5cd8 in __sem_open (name=0x804868e "ace_semaphore_foo",  
> oflag=2560)
>      at /usr/src/lib/libc/gen/sem.c:217
> #2  0x080485ee in main () at test-sem_open.cc:168
> Current language:  auto; currently asm
> 
> 
> (gdb) bt full
> #0  0x281bf297 in ksem_open () at ksem_open.S:2
> No locals.
> #1  0x281b5cd8 in __sem_open (name=0x804868e "ace_semaphore_foo",  
> oflag=2560)
>      at /usr/src/lib/libc/gen/sem.c:217
>          sem = (sem_t *) 0xbfbfec9c
>          s = 0x4e
>          semid = 1
>          mode = 78
>          value = 1
> #2  0x080485ee in main () at test-sem_open.cc:168
>          s = (sem_t *) 0xa00
> ===============================
> 
> BTW: Please add me in CC, I am not on the list.

You need to make sure you have "options P1003_1B_SEMAPHORES" in your
kernel.  These POSIX IPC constructs are labeled as being very
experimental, and this is not a default option.

Joe

-- 
PGP Key : http://www.marcuscom.com/pgp.asc
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