Hi! On Mon, 26 Mar 2012 21:51:18 +0200, l...@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) wrote: > Samuel Thibault <samuel.thiba...@gnu.org> skribis: > > > Ludovic Courtès, le Sat 24 Mar 2012 22:24:38 +0100, a écrit : > >> There might still be something wrong with the user-space stack trace > >> though, but it could be due to something else: > >> > >> $ addr2line -pfa -e > >> /nix/store/dsw2yh0sxidmijg2y3vjps1mqjvx6q5w-hurd-0-i586-pc-gnu/hurd/auth > >> 0x103ac23 > >> 0x0103ac23: ?? > >> ??:0 > >> > >> (The Hurd above is compiled with -O1.) > > > > Is it compiled with -fno-omit-frame-pointer too? -O enables omitting > > frame pointers "where doing so does not interfere with debugging.", but > > the mach debugger is probably very poor in that regard.
s%probably%%
> Yes, but ‘-fomit-frame-pointer’ is enabled “at levels `-O', `-O2',
> `-O3', `-Os'” (info "(gcc) Optimize Options").
>
> Anyway, building with “-O1 -fno-omit-frame-pointer” yields slightly
> better, yet imperfect traces:
>
> db> show task
> TASK THREADS
> 5 (e0823c60): 4 threads:
> 0 (e083e548) R F
> 1 (e083e2a8) W (0xc014c4b0) 0
> 2 (e084ce80) R (0xc014c4b0)
> 3 (e084cbe0) W (0xc014c620) 0
> db> trace/tu
> 0xc011eae9(c027c819,e0823c60,17,e083e548,e0847ef8)
> 0xc014ee59(e0820dc0,17,e0847ef8,128bc70,a)
> 0xc01529dc(1,17,e0847ef8,e0824d20,ea0359c8)
> 0xc0106d40(128fdbc,2000,a,800,0)
> >>>>> user space <<<<<
> 0x103ac3d(1,0,0,0,3a)
> 0x103af69(804ccf8,80494ec,7530,0,0)
> 0x804a2a3(1,128fed4,128fedc,f3d4,128fed4)
> Bad frame pointer: 0x1
>
> and:
>
> $ addr2line -pfa -e result/hurd/auth 0x103ac3d 0x103af69 0x804a2a3
> 0x0103ac3d: ??
> ??:0
> 0x0103af69: ??
> ??:0
> 0x0804a2a3: main at
> /tmp/nix-build-3bm2lp9lkj6bczd61p9qj1ramlpxy7wh-hurd-0-i586-pc-gnu.drv-0/hurd-20120326/auth/auth.c:523
>
> The strange thing is that the top-most part is correct.
I would bet this is ld.so/libc.so/etc. Not matching your /hurd/auth
binary, but compare:
$ ldd /hurd/auth
libhurdbugaddr.so.0.3 => /lib/libhurdbugaddr.so.0.3 (0x01040000)
libthreads.so.0.3 => /lib/libthreads.so.0.3 (0x01042000)
libports.so.0.3 => /lib/libports.so.0.3 (0x01049000)
libihash.so.0.3 => /lib/libihash.so.0.3 (0x01053000)
libshouldbeinlibc.so.0.3 => /lib/libshouldbeinlibc.so.0.3
(0x01056000)
libc.so.0.3 => /lib/i386-gnu/libc.so.0.3 (0x01062000)
/lib/ld.so => /lib/ld.so.1 (0x00001000)
libmachuser.so.1 => /lib/i386-gnu/libmachuser.so.1 (0x011f7000)
libhurduser.so.0.3 => /lib/i386-gnu/libhurduser.so.0.3 (0x0120b000)
Might this work (hooray for no address space randomization); on the
GNU/Hurd system:
$ gdb -q /hurd/auth
(gdb) start
(gdb) info symbol *0x0103ac3d
Grüße,
Thomas
pgpQI6SFecn1f.pgp
Description: PGP signature
