This is the mail archive of the
systemtap@sourceware.org
mailing list for the systemtap project.
Failure in syscall.open probe
- From: Arkady <arkady dot miasnikov at gmail dot com>
- To: systemtap at sourceware dot org
- Date: Thu, 24 Aug 2017 17:26:22 +0300
- Subject: Failure in syscall.open probe
- Authentication-results: sourceware.org; auth=none
Hi,
I am trying the following code
https://gist.github.com/larytet/5c361b1a4ee967655f500909026978f9
- the script is mostly syscall.open and syscall.open.return
on CentOS release 6.9 (Final)
kernel 2.6.32-696.3.2.el6.x86_64 #1 SMP Tue Jun 20 01:26:55 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
g++ (GCC) 5.3.1 20160406 (Red Hat 5.3.1-6)
I use a custom build of 3.1 release of Systemtap
Systemtap translator/driver (version 3.1/0.164, commit
release-2.9-1416-gb8ea350dc13a)
Copyright (C) 2005-2017 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.18 ... 4.10-rc8
enabled features: PYTHON2 NLS
Build command stap -g -p4 -m test_open -g --suppress-time-limits -v -k
-D MAXSKIPPED=0 -D MAXTRYLOCK=100000 -D TRYLOCKDELAY=1 test_open.stp
I restart the script using the following bash one liner
count=0;while [ 1 ];do echo $count;count=$(($count+1));sudo rmmod
test_open;sudo staprun test_open.ko -L ;done;
30-50 restarts later I get an exception:
Aug 24 10:13:52 localhost kernel: <#DB> [<ffffffff81068244>] ?
__schedule_bug+0x44/0x50
Aug 24 10:13:52 localhost kernel: [<ffffffff8154af4c>] ? schedule+0xa4c/0xb70
Aug 24 10:13:52 localhost kernel: [<ffffffff812a6356>] ? vsnprintf+0x336/0x5e0
Aug 24 10:13:52 localhost kernel: [<ffffffff810740aa>] ?
__cond_resched+0x2a/0x40
Aug 24 10:13:52 localhost kernel: [<ffffffff8154b340>] ? _cond_resched+0x30/0x40
Aug 24 10:13:52 localhost kernel: [<ffffffff812a8cda>] ?
strncpy_from_user+0x4a/0x90
Aug 24 10:13:52 localhost kernel: [<ffffffffa0703fb0>] ?
function___global_user_string_quoted__overload_0+0x460/0x890
[test_open]
Aug 24 10:13:52 localhost kernel: [<ffffffffa070281e>] ?
_new_map_create+0x3e/0xa0 [test_open]
Aug 24 10:13:52 localhost kernel: [<ffffffffa07047f1>] ?
probe_3606+0x101/0x400 [test_open]
Aug 24 10:13:52 localhost kernel: [<ffffffff81196da1>] ? sys_open+0x1/0x30
Aug 24 10:13:52 localhost kernel: [<ffffffffa0707ce0>] ?
enter_kprobe_probe+0x1c0/0x2d0 [test_open]
Aug 24 10:13:52 localhost kernel: [<ffffffff815513fb>] ?
aggr_pre_handler+0x5b/0xb0
Aug 24 10:13:52 localhost kernel: [<ffffffff81196da0>] ? sys_open+0x0/0x30
Aug 24 10:13:52 localhost kernel: [<ffffffff81196da1>] ? sys_open+0x1/0x30
Aug 24 10:13:52 localhost kernel: [<ffffffff81550e15>] ?
kprobe_exceptions_notify+0x3d5/0x430
Aug 24 10:13:52 localhost kernel: [<ffffffff81551085>] ?
notifier_call_chain+0x55/0x80
Aug 24 10:13:52 localhost kernel: [<ffffffff815510ea>] ?
atomic_notifier_call_chain+0x1a/0x20
Aug 24 10:13:52 localhost kernel: [<ffffffff810acd0e>] ? notify_die+0x2e/0x30
Aug 24 10:13:52 localhost kernel: [<ffffffff8154e955>] ? do_int3+0x35/0xb0
Aug 24 10:13:52 localhost kernel: [<ffffffff8154e1c3>] ? int3+0x33/0x40
Aug 24 10:13:52 localhost kernel: [<ffffffff81196da0>] ? sys_open+0x0/0x30
Thank you, Arkady.