Thanks Russ,
ar% ps
...
none 1236297 49979:50 0:00 172K Running validateaddress
...
ar% acid 1236297
/proc/1236297/text:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: bpset(strcmp)
Waiting...
1236297: exception 50 klook+0x7a MOVL 0x8(DX),DX
acid: loop 1,20 do { cont(); print("strcmp '", *(*strcmp:s1\s), "'
'",*(*strcmp:s2\s), "'\n"); }
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
1236297: breakpoint strcmp+0x3 MOVL s1+0x0(FP),BP
1236297: breakpoint strcmp SUBL $0xc,SP
strcmp 'in' 'prompt'
acid: acid: bpdel(strcmp)
acid: bpset(klook)
acid: cont();
<stdin>:5: (error) msg: pid=1236297 startstop: interrupted
acid: bpdel(klook)
Kenji Arisawa
On 2009/08/12, at 0:27, Russ Cox wrote:
acid pid
bpset(strcmp)
loop 1,20 do { cont(); print("strcmp '", *(*strcmp:s1\s), "' '",
*(*strcmp:s2\s), "'\n"); }
bpdel(strcmp)
also
bpset(klook)
cont();
# wait a while, see if you hit the breakpoint, probably not
DEL (to stop acid if it didn't hit the breakpoint)
bpdel(klook)
if you do hit the klook breakpoint then try
the same sequence but with yyparse instead
of klook.
the goal is to find some function that isn't being
repeatedly called. that helps narrow down the
source of the infinite loop to code inside that
function or the ones it calls.
russ
