Messages in this thread | | | Date | Wed, 9 Jun 2010 16:35:59 +0800 | From | Américo Wang <> | Subject | Re: Additional info on modpost segfault |
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On Tue, Jun 08, 2010 at 11:24:18AM -0700, Alan wrote: >On Tue, 2010-06-08 at 13:51 +0800, Américo Wang wrote: >> On Mon, Jun 07, 2010 at 09:59:39AM -0700, Alan wrote: >> >On Fri, 2010-06-04 at 09:22 +0200, Michal Marek wrote: >> >> On 4.6.2010 06:51, Américo Wang wrote: >> >> > On Thu, Jun 03, 2010 at 08:10:30PM -0700, alan wrote: >> >> >> Missed adding the actual segfault message: >> >> >> >> >> >> LD drivers/usb/built-in.o >> >> >> LD drivers/built-in.o >> >> >> LD vmlinux.o >> >> >> MODPOST vmlinux.o >> >> >> /bin/sh: line 1: 20665 Segmentation fault (core dumped) >> >> >> scripts/mod/modpost -o >> >> >> /home/alan/GitTrees/linux-2.6-mid-ref/Module.symvers -S vmlinux.o >> >> >> make[1]: *** [vmlinux.o] Error 139 >> >> >> make: *** [vmlinux.o] Error 2 >> >> >> >> >> >> I have looked at the gcc 4.4.4 changelog and I can't see anything >> >> >> that should cause this. >> >> >> >> >> > >> >> > Hmm, you need to find which program segfaults here. >> >> >> >> It's the modpost command run on vmlinux.o. Alan, can you try >> >> $ gdb --args scripts/mod/modpost -o Module.symvers -S vmlinux.o >> >> (gdb) r >> >> (wait for the segfault) >> >> (gdb) bt full >> >> >> >> and post the backtrace? >> > >> >Don't know if this will help much. >> > >> >This GDB was configured as "x86_64-redhat-linux-gnu". >> >For bug reporting instructions, please see: >> ><http://www.gnu.org/software/gdb/bugs/>... >> >Reading symbols >> >from /home/alan/GitTrees/linux-2.6-mid-ref/scripts/mod/modpost...(no >> >debugging symbols found)...done. >> >(gdb) r >> >Starting >> >program: /home/alan/GitTrees/linux-2.6-mid-ref/scripts/mod/modpost -o >> >Module.symvers -S vmlinux.o >> > >> >Program received signal SIGSEGV, Segmentation fault. >> >0x0000000000403711 in main () >> >(gdb) bt full >> >#0 0x0000000000403711 in main () >> >No symbol table info available. >> > >> >Trying to get it to compile with debugging info. >> > >> >> Try to append "-g" to HOSTCFLAGS in the top Makefile. ;) > >Thanks. Tried CFLAGS and that did not work... > >Here is the backtrace: >(gdb) bt full >#0 read_symbols (argc=5, argv=0x7fffffffe198) at >scripts/mod/modpost.c:1564 > license = <value optimized out> > info = {size = 209695023, hdr = 0x7fffeb263000, > sechdrs = 0x7ffff48fcc2c, symtab_start = 0x7ffff7863e2c, > symtab_stop = 0x7ffff794341c, export_sec = 37, > export_unused_sec = 0, export_gpl_sec = 48, > export_unused_gpl_sec = 0, export_gpl_future_sec = 0, > strtab = 0x7ffff794341c "", modinfo = 0x0, modinfo_len = 0} > sym = <value optimized out> > symname = <value optimized out> > version = <value optimized out> > mod = 0x610010 >#1 main (argc=5, argv=0x7fffffffe198) at scripts/mod/modpost.c:1999 > mod = <value optimized out> > buf = {p = 0x0, pos = 0, size = 0} > kernel_read = <value optimized out> > module_read = <value optimized out> > dump_write = 0x7fffffffe4ed "Module.symvers" > opt = <value optimized out> > err = <value optimized out> > extsym_iter = <value optimized out> > extsym_start = <value optimized out> > >The line is does not like is: > > read_symbols(argv[optind++]); > >Not certain why...
Hmm, it seems the segfault happens at 'license = get_modinfo(...)'? I can't spot any bug around that.
If I were you, I would do a step by step debug with gdb.
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