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Reproducible also with upstream 3.6.0-rc1.
Works OK if I revert following commit:
commit 05f144a0d5c2207a0349348127f996e104ad7404
Author: Mel Gorman <mgorman>
Date: Wed May 23 12:48:13 2012 +0100
mm: mempolicy: Let vma_merge and vma_split handle vma->vm_policy linkages
Dave Jones' system call fuzz testing tool "trinity" triggered the
following bug error with slab debugging enabled
Description of problem: LTP testcases, which rely on mbind are currently failing. It appears that starting with 3.5.0-0.23.el7 mbind syscall has no effect. For example: ---------------------- mbind_test.c -------------------- #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/mman.h> #include <numaif.h> #include <errno.h> /* gcc mbind_test.c -lnuma -o mbind_test -Wall */ #define MAXNODE 4096 int main() { int ret; int len; int policy = -1; unsigned char *p; unsigned long mask[MAXNODE] = { 0 }; unsigned long retmask[MAXNODE] = { 0 }; len = getpagesize(); p = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); if (p == MAP_FAILED) printf("mbind err: %d\n", errno); mask[0] = 1; ret = mbind(p, len, MPOL_BIND, mask, MAXNODE, 0); if (ret < 0) printf("mbind err: %d %d\n", ret, errno); ret = get_mempolicy(&policy, retmask, MAXNODE, p, MPOL_F_ADDR); if (ret < 0) printf("get_mempolicy err: %d %d\n", ret, errno); if (policy == MPOL_BIND) printf("OK\n"); else printf("ERROR: policy is %d\n", policy); return 0; } ---------------------- /mbind_test.c ------------------- strace snippet with 3.3.0-0.20.el7.x86_64 -> OK ... mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0) = 0x7f033809e000 mbind(0x7f033809e000, 4096, MPOL_BIND, {0x0000000000000001, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, ...}, 4096, 0) = 0 get_mempolicy(MPOL_BIND, {0x0000000000000001, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, ...}, 4096, 0x7f033809e000, MPOL_F_ADDR) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f033809d000 write(1, "OK\n", 3OK strace snippet with 3.5.0-0.23.el7.x86_64 -> PROBLEM ... mbind(0x7fb85ee4e000, 4096, MPOL_BIND, {0x0000000000000001, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, ...}, 4096, 0) = 0 get_mempolicy(MPOL_DEFAULT, {000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, 000000000000000000, ...}, 4096, 0x7fb85ee4e000, MPOL_F_ADDR) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb85ee4d000 write(1, "ERROR: policy is 0\n", 19ERROR: policy is 0 Version-Release number of selected component (if applicable): 3.5.0-0.23.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. run mbind_test.c in description Actual results: get_mempolicy() returns different policy than what mbind() has set, returned nodemask is empty Expected results: get_mempolicy() returns policy MPOL_BIND, returned nodemask should match the one passed to mbind() Additional info: failing LTP testcases include: mbind01, get_mempolicy01, move_pages01