[Bug libc/228] bus error signal during unaligned memory access...

["pluto at pld-linux dot org" <sourceware-bugzilla at sources dot redhat dot com>]

------- Additional Comments From pluto at pld-linux dot org  2004-06-22 09:22 -------
(In reply to comment #3) 
> Works just fine for me. 
> Can you debug this some more? See what value %g7 had at the point of the 
crash, 
> where it got corrupted? 
 
Hmm, I found something strange... 
 
# built with -static 
 
0x0000000000109ee0 <__nss_passwd_lookup+0>:     save  %sp, -192, %sp 
0x0000000000109ee4 <__nss_passwd_lookup+4>:     sethi  %hi(0x270800), %l1 
0x0000000000109ee8 <__nss_passwd_lookup+8>:     sethi  %hi(0x158000), %o0 
0x0000000000109eec <__nss_passwd_lookup+12>:    ldx  [ %l1 + 0x240 ], %g1 
0x0000000000109ef0 <__nss_passwd_lookup+16>:    sethi  %hi(0x158000), %o2 
0x0000000000109ef4 <__nss_passwd_lookup+20>:    or  %o0, 0x2a0, %o0 
0x0000000000109ef8 <__nss_passwd_lookup+24>:    or  %o2, 0x390, %o2 
0x0000000000109efc <__nss_passwd_lookup+28>:    clr  %o1 
0x0000000000109f00 <__nss_passwd_lookup+32>:    mov  %i0, %l0 
0x0000000000109f04 <__nss_passwd_lookup+36>:    brz,pn   %g1, 0x109f18 
<__nss_passwd_lookup+56> 
0x0000000000109f08 <__nss_passwd_lookup+40>:    or  %l1, 0x240, %o3 
0x0000000000109f0c <__nss_passwd_lookup+44>:    stx  %g1, [ %l0 ] 
0x0000000000109f10 <__nss_passwd_lookup+48>:    b  %xcc, 0x109200 
<__nss_lookup> 
0x0000000000109f14 <__nss_passwd_lookup+52>:    restore 
0x0000000000109f18 <__nss_passwd_lookup+56>:    call  0x109b00 
<__nss_database_lookup> 
0x0000000000109f1c <__nss_passwd_lookup+60>:    nop 
0x0000000000109f20 <__nss_passwd_lookup+64>:    cmp  %o0, 0 
0x0000000000109f24 <__nss_passwd_lookup+68>:    bl,pn   %icc, 0x109f38 
<__nss_passwd_lookup+88> 
0x0000000000109f28 <__nss_passwd_lookup+72>:    ldx  [ %l1 + 0x240 ], %g1 
0x0000000000109f2c <__nss_passwd_lookup+76>:    stx  %g1, [ %l0 ] 
0x0000000000109f30 <__nss_passwd_lookup+80>:    b  %xcc, 0x109200 
<__nss_lookup> 
0x0000000000109f34 <__nss_passwd_lookup+84>:    restore 
0x0000000000109f38 <__nss_passwd_lookup+88>:    rett  %i7 + 8 
0x0000000000109f3c <__nss_passwd_lookup+92>:    mov  -1, %o0 
 
(gdb) bt 
#0  0x0000000000109ee4 in __nss_passwd_lookup () 
#1  0x00000000001084a8 in getpwuid_r () 
#2  0x000000000010825c in getpwuid () 
#3  0x0000000000100470 in main (argc=1, argv=0x7fffffffa78) at test01.c:7 
 
(...) 
0x0000000000109f2c in __nss_passwd_lookup () 
(gdb) ni 
0x0000000000109f30 in __nss_passwd_lookup () 
(gdb) ni 
0x0000000000109f34 in __nss_passwd_lookup () 
(gdb) ni 
 
Program terminated with signal SIGSEGV, Segmentation fault. 
 
# built without -static 
 
Breakpoint 1, main (argc=1, argv=0x7fffffffa68) at test01.c:6 
6           unsigned uid = getuid(); 
(gdb) c 
Continuing. 
 
Breakpoint 2, 0xfffff8000012cce4 in __errno_location () from /lib64/libc.so.6 
(gdb) bt 
#0  0xfffff8000012cce4 in __errno_location () from /lib64/libc.so.6 
#1  0xfffff8000020872c in xdr_uint8_t () from /lib64/libc.so.6 
#2  0xfffff800002081ac in xdr_uint8_t () from /lib64/libc.so.6 
#3  0xfffff80000208360 in xdr_uint8_t () from /lib64/libc.so.6 
#4  0xfffff800001a7f04 in getpwuid_r () from /lib64/libc.so.6 
#5  0xfffff800001a775c in getpwuid () from /lib64/libc.so.6 
#6  0x00000000001008c4 in main (argc=1, argv=0x7fffffffa68) at test01.c:7 
(gdb) c 
Continuing. 
 
Breakpoint 2, 0xfffff8000012cce4 in __errno_location () from /lib64/libc.so.6 
(gdb) bt 
#0  0xfffff8000012cce4 in __errno_location () from /lib64/libc.so.6 
#1  0xfffff800001d92fc in connect () from /lib64/libc.so.6 
#2  0xfffff800001d92fc in connect () from /lib64/libc.so.6 
Previous frame identical to this frame (corrupt stack?) 
 

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http://sources.redhat.com/bugzilla/show_bug.cgi?id=228

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