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[Bug kprobes/5963] testsuite/systemtap.maps/pmap_agg_overflow.stp crashes on 2.6.25-0.121.rc5.git4.fc9
- From: "ananth at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 19 Mar 2008 09:32:36 -0000
- Subject: [Bug kprobes/5963] testsuite/systemtap.maps/pmap_agg_overflow.stp crashes on 2.6.25-0.121.rc5.git4.fc9
- References: <20080318180027.5963.wcohen@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From ananth at in dot ibm dot com 2008-03-19 09:32 -------
>From the objdump, it looks like the OOPS is at hlist_for_each_entry_rcu() in
get_kprobe(). Code surrounding this hasn't changed since July 2005!
However, a custom built 2.6.25-rc6 on the F9-Alpha works fine. Strange!
[ananth@... linux-2.6.25-rc6]$ uname -a
Linux ....in.ibm.com 2.6.25-rc6-lean #1 Wed Mar 19 13:53:38 IST 2008 i686 i686
i386 GNU/Linux
[ananth@... linux-2.6.25-rc6]$ stap -V
SystemTap translator/driver (version 0.6.2/0.133 built 2008-03-18)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
Objdump of the same portion on the working kernel is:
00000000 <get_kprobe>:
0: 89 c1 mov %eax,%ecx
2: 69 c0 01 00 37 9e imul $0x9e370001,%eax,%eax
8: 53 push %ebx
9: 83 ec 04 sub $0x4,%esp
c: 89 e3 mov %esp,%ebx
e: c1 e8 1a shr $0x1a,%eax
11: 8b 04 85 08 00 00 00 mov 0x8(,%eax,4),%eax
18: 89 04 24 mov %eax,(%esp)
1b: eb 03 jmp 20 <get_kprobe+0x20>
1d: 89 14 24 mov %edx,(%esp)
20: 8b 03 mov (%ebx),%eax
22: 85 c0 test %eax,%eax
24: 74 0e je 34 <get_kprobe+0x34>
26: 8b 04 24 mov (%esp),%eax
29: 8b 10 mov (%eax),%edx
2b: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
2f: 39 48 18 cmp %ecx,0x18(%eax)
32: 75 e9 jne 1d <get_kprobe+0x1d>
34: 5a pop %edx
35: 5b pop %ebx
36: c3 ret
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5963
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