I have a problem with an abort() getting called by the following code in
linux-core.c:
int uv__io_check_fd(uv_loop_t* loop, int fd) {
struct uv__epoll_event e;
int rc;
e.events = POLLIN;
e.data = -1;
rc = 0;
if (uv__epoll_ctl(loop->backend_fd, UV__EPOLL_CTL_ADD, fd, &e))
if (errno != EEXIST)
rc = -errno;
if (rc == 0)
if (uv__epoll_ctl(loop->backend_fd, UV__EPOLL_CTL_DEL, fd, &e))
abort();
return rc;
}
(gdb) frame 2
#2 0x000000000080d842 in uv__io_check_fd (loop=0x7ffff7dd8c40 <libLoop>,
fd=33) at ../src/unix/linux-core.c:164
164 ../src/unix/linux-core.c: No such file or directory.
(gdb) p errno
$1 = 2
My understanding is this code is to check whether the FD can actually be
added to the epoll set. What I don't get, is why the abort() would ever be
reached. I.e. why does epol_ctl() allow you to add the FD if it can't
remove it (meaning it really could not add it)?
I was wondering if someone could shed some light on how this code came
about, and why an FD would be in such a state that it would reach the
abort(). The amount knowledge on the epoll inner workings out there on the
net is minimal.
In my case, the errno is 2 on second epoll_ctl fail, which is ENOENT
Thanks so much,
Ed
more backtrace
(gdb) bt
#0 0x00007ffff6c08c37 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff6c0c028 in __GI_abort () at abort.c:89
#2 0x000000000080d842 in uv__io_check_fd (loop=0x7ffff7dd8c40 <libLoop>,
fd=33) at ../src/unix/linux-core.c:164
#3 0x000000000080273c in uv_poll_init (loop=0x7ffff7dd8c40 <libLoop>,
handle=0x1780858, fd=33) at ../src/unix/poll.c:58
#4 0x00007ffff7bc8715 in fdRedirectorTicket::fdRedirectorTicket(unsigned
int, int, void (*)(GreaseLibError*, int, int)) ()
from
/home/ed/work/gostuff/src/github.com/WigWagCo/maestro/../greasego/deps/lib/libgrease.so.1
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