* [Bug runtime/5051] New: backtrace() in return probes are failed on ia64
@ 2007-09-20 21:35 mhiramat at redhat dot com
2007-09-21 7:07 ` [Bug runtime/5051] " jkenisto at us dot ibm dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: mhiramat at redhat dot com @ 2007-09-20 21:35 UTC (permalink / raw)
To: systemtap
I called the backtrace() at the return probe of __kmalloc() on ia64 (linux-2.6.22).
But the result seems be broken. Is this a known limitation?
Returning from: 0xa000000100146fe0 : __kmalloc+0x0/0x240 []
Returning to : 0xa0000001001b3de0 : bio_copy_user+0xa0/0x540 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
0xa0000001000588c0 : kretprobe_trampoline+0x0/0x20 []
--
Summary: backtrace() in return probes are failed on ia64
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: mhiramat at redhat dot com
GCC host triplet: ia64
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug runtime/5051] backtrace() in return probes are failed on ia64
2007-09-20 21:35 [Bug runtime/5051] New: backtrace() in return probes are failed on ia64 mhiramat at redhat dot com
@ 2007-09-21 7:07 ` jkenisto at us dot ibm dot com
2007-09-24 17:47 ` hunt at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: jkenisto at us dot ibm dot com @ 2007-09-21 7:07 UTC (permalink / raw)
To: systemtap
------- Additional Comments From jkenisto at us dot ibm dot com 2007-09-20 21:51 -------
I can't say for sure whether there's an ia64-specific problem here. But the
fact that kretprobes messes up stack backtraces is documented. Search for
"stack backtraces" in Documentation/kprobes.txt.
This limitation could be fixed, or at least mitigated, by adding a function to
kprobes that returns the return address from the Nth kretprobe_instance for the
indicated task in that task's bucket in kretprobe_inst_table[]. (Keep in mind
that if you have multiple kretprobes on the same function, only one of the
kretprobe_instances will have the true return address; the others will have the
kretprobe trampoline address.)
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug runtime/5051] backtrace() in return probes are failed on ia64
2007-09-20 21:35 [Bug runtime/5051] New: backtrace() in return probes are failed on ia64 mhiramat at redhat dot com
2007-09-21 7:07 ` [Bug runtime/5051] " jkenisto at us dot ibm dot com
@ 2007-09-24 17:47 ` hunt at redhat dot com
2007-11-13 7:19 ` shaohua dot li at intel dot com
2007-11-19 21:19 ` mhiramat at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: hunt at redhat dot com @ 2007-09-24 17:47 UTC (permalink / raw)
To: systemtap
------- Additional Comments From hunt at redhat dot com 2007-09-24 15:26 -------
This is not a known problem. Looking at the posted ia64 test results, there are
no failures listed for context.exp, which tests return probe backtraces. Strange.
On x86, this script
probe kernel.function("__kmalloc"), kernel.function("__kmalloc").return
{
printf("backtrace from %s:\n", pp())
print_backtrace()
print("\n")
}
outputs
backtrace from kernel.function("__kmalloc@mm/slab.c:3721"):
0xc0477c29 : __kmalloc+0x1/0xd2 []
0xc06311ab : kretprobe_trampoline_holder+0x0/0x2f []
0xc05c5848 : sock_alloc_send_skb+0x74/0x1ab []
0xc05c8501 : skb_dequeue+0xf/0x3f []
0xc062667c : unix_stream_sendmsg+0x150/0x311 []
0xc05c2ed9 : sock_aio_write+0xf9/0x105 []
0xc047ae81 : do_sync_readv_writev+0xc1/0xfe []
0xc043bb59 : autoremove_wake_function+0x0/0x35 []
0xc04f32a0 : copy_from_user+0x32/0x5e []
0xc047ad3c : rw_copy_check_uvector+0x5c/0xb0 []
0xc047b5e6 : do_readv_writev+0xbc/0x187 []
0xc05c2de0 : sock_aio_write+0x0/0x105 []
0xc04a966f : dnotify_parent+0x1a/0x5d []
0xc047b6ee : vfs_writev+0x3d/0x48 []
0xc047bb60 : sys_writev+0x41/0x95 []
0xc0406e6e : sysenter_past_esp+0x5f/0x99 []
backtrace from kernel.function("__kmalloc@mm/slab.c:3721").return:
Returning from: 0xc0477c28 : __kmalloc+0x0/0xd2 []
Returning to : 0xc05c91fc : __alloc_skb+0x49/0xf7 []
0xc05c5848 : sock_alloc_send_skb+0x74/0x1ab []
0xc05c8501 : skb_dequeue+0xf/0x3f []
0xc062667c : unix_stream_sendmsg+0x150/0x311 []
0xc05c2ed9 : sock_aio_write+0xf9/0x105 []
0xc047ae81 : do_sync_readv_writev+0xc1/0xfe []
0xc043bb59 : autoremove_wake_function+0x0/0x35 []
0xc04f32a0 : copy_from_user+0x32/0x5e []
0xc047ad3c : rw_copy_check_uvector+0x5c/0xb0 []
0xc047b5e6 : do_readv_writev+0xbc/0x187 []
0xc05c2de0 : sock_aio_write+0x0/0x105 []
0xc04a966f : dnotify_parent+0x1a/0x5d []
0xc047b6ee : vfs_writev+0x3d/0x48 []
0xc047bb60 : sys_writev+0x41/0x95 []
0xc0406e6e : sysenter_past_esp+0x5f/0x99 []
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug runtime/5051] backtrace() in return probes are failed on ia64
2007-09-20 21:35 [Bug runtime/5051] New: backtrace() in return probes are failed on ia64 mhiramat at redhat dot com
2007-09-21 7:07 ` [Bug runtime/5051] " jkenisto at us dot ibm dot com
2007-09-24 17:47 ` hunt at redhat dot com
@ 2007-11-13 7:19 ` shaohua dot li at intel dot com
2007-11-19 21:19 ` mhiramat at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: shaohua dot li at intel dot com @ 2007-11-13 7:19 UTC (permalink / raw)
To: systemtap
------- Additional Comments From shaohua dot li at intel dot com 2007-11-13 07:19 -------
please try the patch http://marc.info/?l=linux-ia64&m=119493734125209&w=2,
works for me.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug runtime/5051] backtrace() in return probes are failed on ia64
2007-09-20 21:35 [Bug runtime/5051] New: backtrace() in return probes are failed on ia64 mhiramat at redhat dot com
` (2 preceding siblings ...)
2007-11-13 7:19 ` shaohua dot li at intel dot com
@ 2007-11-19 21:19 ` mhiramat at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: mhiramat at redhat dot com @ 2007-11-19 21:19 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2007-11-19 21:19 -------
(In reply to comment #3)
> please try the patch http://marc.info/?l=linux-ia64&m=119493734125209&w=2,
> works for me.
Great! I tested it on 2.6.24-rc2 and it works for me.
Thank you
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-11-19 21:19 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-09-20 21:35 [Bug runtime/5051] New: backtrace() in return probes are failed on ia64 mhiramat at redhat dot com
2007-09-21 7:07 ` [Bug runtime/5051] " jkenisto at us dot ibm dot com
2007-09-24 17:47 ` hunt at redhat dot com
2007-11-13 7:19 ` shaohua dot li at intel dot com
2007-11-19 21:19 ` mhiramat at redhat dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).