[Valgrind-developers] valgrind process becomes zombie

[Konstantin S. <kon...@gm...>]

Hello,

I am experiencing a problem with valgrind: the memcheck process
becomes zombie at the very end of the program execution.
This happens with the fresh valgrind trunk.

I run
  valgrind -v --trace-syscalls=yes my_program
and it hangs one out of 5-10 runs.

'top' shows:
 7806 me       18   0     0    0    0 Z    0  0.0   0:16.27 memcheck <defunct>

The last lines printed by valgrind before it hangs are:
SYSCALL[7806,4](  9) sys_mmap ( 0x0, 69632, 7, 98, -1, 0 ) -->
[pre-success] Success(0xbb6b000)
SYSCALL[7806,4]( 10) sys_mprotect ( 0xbb6b000, 4096, 0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 56) sys_clone ( 3d0f00, 0xbb7a1d0, 0xbb7b9f0,
0xbb7b9f0, 0xbb7b960 ) --> [pre-success] Success(0x1f93)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bd70, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bac0, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bd70, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bac0, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4](202) sys_futex ( 0x8427820, 0, 0, 0xb75bb20, 0x8427820
) --> [async] ...
SYSCALL[7806,4](202) ... [async] --> Failure(0x6e)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bac0, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bd70, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4]( 96) sys_gettimeofday ( 0xb75bac0, 0x0 )[sync] --> Success(0x0)
SYSCALL[7806,4](202) sys_futex ( 0x8427820, 0, 0, 0xb75bb20, 0x8427820
) --> [async] ...
SYSCALL[7806,1]( 11) sys_munmap ( 0x8437000, 8192 )[sync] --> Success(0x0)
SYSCALL[7806,1](231) exit_group( 0 ) --> [pre-success] Success(0x0)
SYSCALL[7806,5](186) sys_gettid ()[sync] --> Success(0x1f93)
SYSCALL[7806,5](202) sys_futex ( 0x8427f20, 0, 0, 0x0, 0x8427f20 ) -->
[async] ...
SYSCALL[7806,4](202) ... [async] --> Failure(0x6e)

If valgrind passes, it does not print lines containing "Failure(0x6e)"

Any idea how to attack this problem further?

Thanks,

--kcc