I think we have enough information to land a fix for this. I've already
reproduced on armhf on xenial with the exact same error:
root@ltrace:~# ltrace ls
__libc_start_main(0x12041, 1, 0x7ecd3894, 0x1e795PTRACE_SINGLESTEP:
Input/output error
3872 couldn't continue when handling __libc_start_main
ltrace in trusty hangs on ARM:
linaro@localhost:~$ ltrace /bin/ls
__libc_start_main(0x9ee9, 1, 0x7e9af7d4, 0x156b1PTRACE_SINGLESTEP: Input/output
error
7943 couldn't continue when handling __libc_start_main (0x9c2c) at 0x9c2c
But upstream master works ok.
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With the final Linaro natty release, ltrace works fine with the above
shell script: http://paste.ubuntu.com/622589/
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Title:
[armel] ltrace hangs
After applying the patch in comment #7 I could run ltrace successfully
on Pandaboard and the testsuite passed too:
=== tests ===
Schedule of variations:
unix
Running target unix
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for
target.
Using
Hi Avik,
Interesting - when I tried my patch it didn't pass the test suite (as
described in comment 9) - which version of ltrace did you patch exactly?
Does the 3 line shell script in patch 9 also work for you?
Dave
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Hi Dave,
I patched against the latest git rev
4649a4cbb3bd6bc516c093adefa5dc7da8141b92.
But when I ran the 3 line shell script I did get a segmentation fault.
Regards,
Avik
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I don't know whether this is the cause of the problem, but ltrace makes
(incorrect) use of the PTRACE_SINGLESTEP ptrace() call.
Support for this ptrace call has been removed from the kernel as of
v2.6.38-rc4, since it had few users, was already substantially broken
for ARM and didn't support
For the kernel change, see
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=425fc47adb5bb69f76285be77a09a3341a30799e
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Interesting, well with that in hand the following patch seems to work OK;
I can see the MIPS sysdep has a separate implementation of
set_instruction_pointer
that explicitly talks about avoiding PTRACE_SINGLESTEP but it's only MIPS that
does that so far.
Dave
--- a/sysdeps/linux-gnu/trace.c
+++
Oh, that patch is against git rev
4649a4cbb3bd6bc516c093adefa5dc7da8141b92 which still seems to be head-
of-tree.
Dave
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Title:
[armel] ltrace
ok, not so fast, so while that works for simple single processes, it
fails three tests:
FAIL: sleep in
/discs/more/daveg/git/ltrace/testsuite/ltrace.minor/attach-process.ltrace for 0
times, should be 1
FAIL: ^[0-9]* puts in
/discs/more/daveg/git/ltrace/testsuite/ltrace.minor/trace-exec.ltrace
We shall look at the tracing session at UDS if we should prefer ltrace
or latrace. I think we should rather have one well working tool rather
than two tools with different set of issues...
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Indeed I've been using latrace, but I have a different selection of more
subtle bugs with that.
Dave
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Title:
[armel] ltrace hangs
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Confirmed, Beagle B5, linary natty beta2 2.6.38-1002-linaro-omap
strace ltrace /bin/true
write(2, __libc_start_main(, 18__libc_start_main() = 18
write(2, 36181, 536181)= 5
write(2, , , 2, ) = 2
write(2, 1, 11)= 1
write(2, , ,
using the developer build from 4/21 and the omap3 hwpack on my beagle Xm
I see the same:
as root:
root@linaro:~# ltrace /bin/ls
signal(55377, 0x0001Killed
as a mere mortal:
tgall@linaro:~/chromium$ ltrace /bin/ls
signal(55377, 0x0001
root@linaro:~# dpkg -l ltrace
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