On Thu, Aug 28, 2014 at 09:50:05AM +0200, Teresa Gamez wrote:
> Hello Sascha,
>
> I noticed a bug on the latest master.
> When no history is present and I hit the arrow up key, I get:
>
> unable to handle NULL pointer dereference at address 0x00000001
> pc : [<9fe243ba>] lr : [<9fe268cf>]
> sp : 9ffff9d0 ip : 00000016 fp : 00000002
> r10: 00000001 r9 : 9fe549dc r8 : 9fe65d08
> r7 : 00000400 r6 : 00000001 r5 : 00000000 r4 : 9fe66258
> r3 : 00000000 r2 : 00000000 r1 : 00000001 r0 : 9fe66258
> Flags: nZCv IRQs off FIQs on Mode SVC_32
> [<9fe243ba>] (strcpy+0xa/0xe) from [<9fe268cf>] (readline+0x363/0x4e0)
> [<9fe268cf>] (readline+0x363/0x4e0) from [<9fe05469>] (file_get
> +0x49/0x110)
>
> I could bisect it to this commit:
>
>
> ada160a34a1ec8421d5bb7b9dd746294668a5130 is the first bad commit
> commit ada160a34a1ec8421d5bb7b9dd746294668a5130
> Author: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Date: Tue Jul 29 11:54:26 2014 +0200
>
> readline: reimplement history functions
>
> ...
#0 0x000000000040db2d in strcpy (dest=0x631a41 <console_buffer+1> "A", dest@entry=0x631a40 <console_buffer> "[A",
src=0x2 <error: Cannot access memory at address 0x2>, src@entry=0x1 <error: Cannot access memory at address 0x1>)
at lib/string.c:95
#1 0x0000000000413275 in readline (prompt=0x631080 <prompt> "\033[1;32mbarebox@\033[1;36mbarebox sandbox:/\033[0m ",
buf=buf@entry=0x631a40 <console_buffer> "[A", len=len@entry=1024) at lib/readline.c:312
#2 0x00000000004064e5 in get_user_input (i=0x7fffffffe3d0) at common/hush.c:449
#3 file_get (i=0x7fffffffe3d0) at common/hush.c:499
#4 0x00000000004069b0 in parse_stream (dest=dest@entry=0x7fffffffe368, ctx=ctx@entry=0x7fffffffe3f0,
input=input@entry=0x7fffffffe3d0, end_trigger=end_trigger@entry=10) at common/hush.c:1492
#5 0x0000000000406ed3 in parse_stream_outer (ctx=ctx@entry=0x7fffffffe3f0, inp=inp@entry=0x7fffffffe3d0, flag=flag@entry=2)
at common/hush.c:1693
#6 0x0000000000407c4b in run_shell () at common/hush.c:1919
#7 0x0000000000402154 in start_barebox () at common/startup.c:113
#8 0x000000000041c9ad in main ()
my backtrace on sandbox system.
Seems there is more broken than this one:
Type:
1. foobar
2. <enter>
3. <key_up>
4. <key_down>
5. <backspace>
#0 memmove (dest=0x631a45 <console_buffer+5>, src=0x631a46 <console_buffer+6>, count=4294818367,
count@entry=4294967290) at lib/string.c:522
#1 0x00000000004130d0 in readline (prompt=0x631080 <prompt> "\033[1;32mbarebox@\033[1;36mbarebox sandbox:/\033[0m ",
buf=buf@entry=0x631a40 <console_buffer> "", len=len@entry=1024) at lib/readline.c:279
#2 0x00000000004064e5 in get_user_input (i=0x7fffffffe3d0) at common/hush.c:449
#3 file_get (i=0x7fffffffe3d0) at common/hush.c:499
#4 0x00000000004069b0 in parse_stream (dest=dest@entry=0x7fffffffe368, ctx=ctx@entry=0x7fffffffe3f0,
input=input@entry=0x7fffffffe3d0, end_trigger=end_trigger@entry=10) at common/hush.c:1492
#5 0x0000000000406ed3 in parse_stream_outer (ctx=ctx@entry=0x7fffffffe3f0, inp=inp@entry=0x7fffffffe3d0,
flag=flag@entry=2) at common/hush.c:1693
#6 0x0000000000407c4b in run_shell () at common/hush.c:1919
#7 0x0000000000402154 in start_barebox () at common/startup.c:113
#8 0x000000000041c93b in main ()
It seems there is somewhere a dangling pointer and whith keydown I hit
the same line like the first issue.
- Alex
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