Messages in this thread | | | Subject | Re: mprotect() failed: Cannot allocate memory | From | Peter Zijlstra <> | Date | Wed, 21 Apr 2010 12:16:50 +0200 |
| |
On Wed, 2010-04-21 at 01:05 +0200, Paweł Sikora wrote: > hi, > > i'm trying to debug an ugly application with ElectricFence. > in fact, on x86-64 box with 8GB ram and 16GB swap i'm getting following error: > > "ElectricFence Exiting: mprotect() failed: Cannot allocate memory" > > the program has been compiled with gcc-4.5, glibc-2.11.1, kernel-2.6.32. > did you ever come across such (kernel/glibc) limitations? > > here's a simple testcase which triggs -ENOMEM in mprotect().
You probably depleted the max map count, see: /proc/sys/vm/max_map_count
We have a limit on the number of maps you can have, those mprotect() calls split you maps like crazy, see also /proc/$pid/maps.
eg. change your second test program to include something like:
char buf[128]; snprintf(buf, sizeof(buf), "cat /proc/%d/maps", (int)getpid()); system(buf);
at the end after lowering your NN count to fit, and observe the result of those mprotect() calls.
-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |