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On Wed, Sep 23, 2009 at 23:11, Matthias Schwarzott <zzam@gentoo.org> wrote: > It is about ioctl failures on amd64: > http://bugs.gentoo.org/show_bug.cgi?id=286041 > > A bad parameter type to an ioctl() call causes udev-146 to generate "error > getting buffer for inotify" messages in syslog. The offending code is > roughly: > > ssize_t nbytes, pos; > // ... > ioctl(fd, FIONREAD, &nbytes); > > where ssize_t is 64 bits on amd64, but the kernel code for FIONREAD (at least > through gentoo-sources-2.6.31) uses type int: > > p = (void __user *) arg; > switch (cmd) { > case FIONREAD: > // ... > ret = put_user(send_len, (int __user *) p); > > so the upper 32 bits of "nbytes" are left uninitialized, and the subsequent > malloc(nbytes) fails unless those 32 bits happen to be zero (or the system has > a LOT of memory).