* [Bug kprobes/4285] New: improve kretprobes BUG message
@ 2007-03-27 2:30 fche at redhat dot com
2007-03-27 5:50 ` [Bug kprobes/4285] " ananth at in dot ibm dot com
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: fche at redhat dot com @ 2007-03-27 2:30 UTC (permalink / raw)
To: systemtap
On a pre-fc7-test vmware image, I sometimes see this kernel BUG:
kernel BUG at arch/i386/kernel/kprobes.c:452!
invalid opcode: 0000 [#1]
SMP
last sysfs file: /module/uhci_hcd/sections/.text
Modules linked in: stap_ec0f35607d3d65b494254c869904aa15_693632(U) xt_tcpudp ipt
able_nat nf_nat nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables x_tables hidp
[...]
EFLAGS: 00010046 (2.6.20-1.2986.fc7 #1)
EIP is at trampoline_handler+0xeb/0x137
eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000000
esi: de14cac0 edi: c1a31ef8 ebp: c1a31ef0 esp: c1a31ed4
ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068
Process migration/0 (pid: 2, ti=c1a31000 task=ed34e030 task.ti=c1a31000)
Stack: 00000096 00000000 00000000 00000000 00000000 de14cac0 00000000 cb9dde28
c06161fa 00000000 00000033 de14cc70 de14cac0 00000000 cb9dde28 de14cac0
0000007b 0000007b 000000d8 ffffffff c06161e4 00000060 00000082 c1a31f94
Call Trace:
[<c04061ed>] show_trace_log_lvl+0x1a/0x2f
[<c040629d>] show_stack_log_lvl+0x9b/0xa3
[<c040645d>] show_registers+0x1b8/0x289
[<c040665b>] die+0x12d/0x242
[<c0615817>] do_trap+0x79/0x91
[<c0406bfe>] do_invalid_op+0x97/0xa1
[<c06155ec>] error_code+0x7c/0x84
[<c06161fa>] kretprobe_trampoline+0x16/0x30
From this information, one cannot tell which kprobe/kretprobe might have been
associated with the problem. It would be helpful if any such assertion-type
messages also printed out information such as the kprobe* or kretprobe/instance
addresses, as those can be mapped back to systemtap modules (with some effort).
--
Summary: improve kretprobes BUG message
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: kprobes
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: fche at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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* [Bug kprobes/4285] improve kretprobes BUG message
2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
@ 2007-03-27 5:50 ` ananth at in dot ibm dot com
2007-03-27 11:36 ` maneesh at in dot ibm dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: ananth at in dot ibm dot com @ 2007-03-27 5:50 UTC (permalink / raw)
To: systemtap
------- Additional Comments From ananth at in dot ibm dot com 2007-03-27 06:50 -------
This is related to the generic Linux Kernel BUG handling mechanism and as such
is not directly related to Kprobes. While it is a good idea to have information
about which particular kprobe caused the problem, IMO, its not something we can
fix from the kprobes layer.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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* [Bug kprobes/4285] improve kretprobes BUG message
2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
2007-03-27 5:50 ` [Bug kprobes/4285] " ananth at in dot ibm dot com
@ 2007-03-27 11:36 ` maneesh at in dot ibm dot com
2007-03-30 4:46 ` ananth at in dot ibm dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: maneesh at in dot ibm dot com @ 2007-03-27 11:36 UTC (permalink / raw)
To: systemtap
------- Additional Comments From maneesh at in dot ibm dot com 2007-03-27 12:36 -------
(In reply to comment #1)
> This is related to the generic Linux Kernel BUG handling mechanism and as such
> is not directly related to Kprobes. While it is a good idea to have information
> about which particular kprobe caused the problem, IMO, its not something we can
> fix from the kprobes layer.
Probably Frank just needs a custom printk message before the BUG_ON hit?
BTW, "esi" has the pointer to kretprobe_instance. I am not sure if just this
info is useful or not.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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* [Bug kprobes/4285] improve kretprobes BUG message
2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
2007-03-27 5:50 ` [Bug kprobes/4285] " ananth at in dot ibm dot com
2007-03-27 11:36 ` maneesh at in dot ibm dot com
@ 2007-03-30 4:46 ` ananth at in dot ibm dot com
2007-03-30 4:47 ` ananth at in dot ibm dot com
2007-03-30 5:43 ` ananth at in dot ibm dot com
4 siblings, 0 replies; 6+ messages in thread
From: ananth at in dot ibm dot com @ 2007-03-30 4:46 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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* [Bug kprobes/4285] improve kretprobes BUG message
2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
` (2 preceding siblings ...)
2007-03-30 4:46 ` ananth at in dot ibm dot com
@ 2007-03-30 4:47 ` ananth at in dot ibm dot com
2007-03-30 5:43 ` ananth at in dot ibm dot com
4 siblings, 0 replies; 6+ messages in thread
From: ananth at in dot ibm dot com @ 2007-03-30 4:47 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |jkenisto at us dot ibm dot
| |com
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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* [Bug kprobes/4285] improve kretprobes BUG message
2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
` (3 preceding siblings ...)
2007-03-30 4:47 ` ananth at in dot ibm dot com
@ 2007-03-30 5:43 ` ananth at in dot ibm dot com
4 siblings, 0 replies; 6+ messages in thread
From: ananth at in dot ibm dot com @ 2007-03-30 5:43 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|systemtap at sources dot |ananth at in dot ibm dot com
|redhat dot com |
http://sourceware.org/bugzilla/show_bug.cgi?id=4285
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2007-03-27 2:30 [Bug kprobes/4285] New: improve kretprobes BUG message fche at redhat dot com
2007-03-27 5:50 ` [Bug kprobes/4285] " ananth at in dot ibm dot com
2007-03-27 11:36 ` maneesh at in dot ibm dot com
2007-03-30 4:46 ` ananth at in dot ibm dot com
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