Hello Everyone, I found that now we can't write into a vma if it was mapped without PROT_READ: mmap(NULL, 4096, PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2ac7eb8000 --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_ACCERR, si_addr=0x7f2ac7eb8000} --- +++ killed by SIGSEGV (core dumped) +++ Segmentation fault [root@linux-next-test ~]# cat test.c #include <sys/mman.h> #include <stdlib.h> int main() { int *p; p = mmap(NULL, 4096, PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); p[0] = 1; return 0; } [root@linux-next-test ~]# uname -a Linux linux-next-test 4.5.0-rc6-next-20160229 #1 SMP Mon Feb 29 17:38:25 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux This issue appeared in 4.5.0-rc5-next-20160226. https://ci.openvz.org/job/CRIU-linux-next/152/console Thanks, Andrew -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>