Roger Oberholtzer wrote:
> On Tue, Aug 9, 2016 at 11:33 AM, Per Jessen <per(a)computer.org> wrote:
>> This morning I came across a daemon that was apparently hanging
>> on select() - when I attached an strace:
>>
>> # strace -p 836
>> Process 836 attached - interrupt to quit
>> select(6, [4 5], [], NULL, NULL) = -1 EBADF (Bad file descriptor)
>> time(NULL) = 1470735061
>> stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1920, ...}) = 0
>> send(3, "<20>Aug 9 11:31:01 bwbemag[836]"..., 79, MSG_NOSIGNAL) = -1 ECONNREFUSED (Connection refused)
>> close(3) = 0
>> socket(PF_FILE, SOCK_DGRAM, 0) = 3
>> fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
>> connect(3, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0
>> send(3, "<20>Aug 9 11:31:01 bwbemag[836]"..., 79, MSG_NOSIGNAL) = 79
>> close(5) = -1 EBADF (Bad file descriptor)
>> close(5) = -1 EBADF (Bad file descriptor)
>> futex(0x804e3a4, FUTEX_CMP_REQUEUE_PRIVATE, 1, 2147483647, 0x804e36c, 0) = 1
>> futex(0xb7e06bd8, FUTEX_WAIT, 837, NULL) = 0
>> time(NULL) = 1470735061
>> stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1920, ...}) = 0
>> send(3, "<21>Aug 9 11:31:01 bwbemag[836]"..., 53, MSG_NOSIGNAL) = 53
>> exit_group(0) = ?
>> Process 836 detached
>>
>>
>> Does anyone have a suggestion as to why this was hanging instead
>> of just having exited long ago? I think it's been hanging on that
>> select() for days or even months.
>
> It is not hanging so much as the select call is never returning that
> there is activity on the monitored ports.
Which would be fine except it suddenly returns "Bad file descriptor" when I
attach strace.
> Perhaps file descriptor 4 or 5 is closed? You can check what they are
> in /proc/836/fd
> Are both 4 and 5 still open?
The process has exited :-(
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