Most recent kernel where this bug did not occur: 2.6.17.13 Distribution: CentOS Hardware Environment: Dual Intel Xeon 5160 Software Environment: gcc 3.4.6, glibc 2.3.4, make 3.8 Problem Description: Using the same config from 2.6.17.13, kernel 2.6.18 fails on make when attempting to make .tmp_vmlinux1 LD .tmp_vmlinux1 net/built-in.o(.text.checkentry+0x1e1): In function `checkentry': net/netfilter/xt_physdev.c:130: undefined reference to `brnf_deferred_hooks' make: *** [.tmp_vmlinux1] Error 1 Line 130 is simply "brnf_deferred_hooks = 1;" This variable is also used on line 118. Adding "int brnf_deferred_hooks = 0;" in a line before line 104 (static int) will cause .tmp_vmlinux1 to be successfully created, and make will finish successfully. However, it will generate a warning (seen below) on now line 119 which can be fixed by changing it to: "if ((brnf_deferred_hooks == 0) & (info->bitmask & XT_PHYSDEV_OP_OUT) && " The warning generated is: net/netfilter/xt_physdev.c: In function `checkentry': net/netfilter/xt_physdev.c:118: warning: ISO C90 forbids mixed declarations and code The kernel produced after making these changes works fine Steps to reproduce: I am unsure of which kernel .config parameter is sparking this. My .config can be found here: http://www.animeforum.com/jakiao/misato.config
I just attempted to replicate this bug on another server of mine. On a dual AMD Opteron 270 system, the bug was successfully replicated. LD .tmp_vmlinux1 net/built-in.o(.text.checkentry+0x1c0): In function `checkentry': net/netfilter/xt_physdev.c:117: undefined reference to `brnf_deferred_hooks' net/built-in.o(.text.checkentry+0x1ea):net/netfilter/xt_physdev.c:130: undefined reference to `brnf_deferred_hooks' make: *** [.tmp_vmlinux1] Error 1
The problematic combination is "physdev" match support (NETFILTER_XT_MATCH_PHYSDEV) without 802.1d Ethernet Bridging (BRIDGE) The commit that introduced int brnf_deferred_hooks is: http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=10ea6ac895418bd0d23900e3330daa6ba0836d26 I have taken the liberty of emailing Patrick McHardy a link back here.
*** This bug has been marked as a duplicate of 7171 ***