Bug 136138 - bad parse in strace on FC2 with 64bit lseek
Summary: bad parse in strace on FC2 with 64bit lseek
Alias: None
Product: Fedora
Classification: Fedora
Component: strace (Show other bugs)
(Show other bugs)
Version: 2
Hardware: i686 Linux
Target Milestone: ---
Assignee: Roland McGrath
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 2004-10-18 08:52 UTC by Maciej Żenczykowski
Modified: 2007-11-30 22:10 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2004-10-20 00:02:38 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

Description Maciej Żenczykowski 2004-10-18 08:52:45 UTC
Version: strace-4.5.5-1
Reproducible: Always

On 32bit x86 the 64bit _llseek seems to be badly parsed by strace.


results in a strace:

_llseek(3, 18446744071562067968, [2147483648], SEEK_SET) = 0

instead of:

_llseek(3, 2147483648, [2147483648], SEEK_SET) = 0

note that 18446744071562067968 == 0xFFFFFFFF80000000,
so basically somehow 0x80000000 is turning into 0xFFFFFFFF80000000.

Can anyone confirm this - or am I totally lost here?

As far as I can tell the problem is definetely with strace, passing in
the correct parameters by hand via asm into the kernel still results
in a wrong strace, and the kernel accepts the values and allows the
seek, and returns the expected value as the result.

Comment 1 Roland McGrath 2004-10-19 22:55:37 UTC
I cannot reproduce any such problem with 4.5.5-1 on x86.  My test program does
exactly the lseek64 call in your report.  Please provide a verified test case to
reproduce the problem.

Comment 2 Maciej Żenczykowski 2004-10-20 00:02:38 UTC
Sorry for the mixup, I've just discovered a local different (unknown
version) copy of strace in /usr/local/bin.  The /usr/bin version which
is from FC2 does work correctly.  My Error, once again sorry.

Note You need to log in before you can comment on or make changes to this bug.