Hi, there,
I have applied the 2.6.13 kgdb patch into my 2.6.12 kernel in Intel X86_64 Xeon
motherboard. kgdb can start well and accept gdb commands and reply. For
example, it can stop at kgdb.c after gdb is connected, allow me issue "info
regi", "info thr", "next", "step", "continue", and ctrl-C to stop the running
kernel etc.
All seem good except the major step: I cannot switch thread. After seeing all
threads, I issue "thr 20" to switch to another thread. The command returns OK,
and the registers seem to have been changed correctly. But when I issue "next"
or "bt", I found it is still in the old thread. What am I missing?
Here is the register infor befor issuing thread switch command.
(gdb) info regi
rax 0xffffffff 4294967295
rbx 0xffffffff8047f860 -2142767008
rcx 0x20 32
rdx 0x0 0
rsi 0xffffffff80689280 -2140630400
rdi 0x0 0
rbp 0xffffffff80636f50 0xffffffff80636f50
rsp 0xffffffff80525038 0xffffffff80525038
r8 0x0 0
r9 0x0 0
r10 0xffff810128021980 -139633010534016
r11 0xe4 228
r12 0xa 10
r13 0x2aaaaacdd360 46912498422624
r14 0x0 0
r15 0x2aaaaacdd360 46912498422624
rip 0xffffffff80155d4b 0xffffffff80155d4b <breakpoint+123>
eflags 0x246 582
cs 0x0 0
ss 0x0 0
ds 0x0 0
es 0x0 0
fs 0x0 0
---Type <return> to continue, or q <return> to quit---
gs 0x0 0
(gdb)
Here is the thread I want to switch to:
19 thread 8365 (tom_ext3_1) 0xffffffff803803d0 in thread_return ()
at kernel/sched.c:1481
Sending packet: $qThreadExtraInfo,20ab#aa...Ack
Packet received: 64645f7070617274006c6f636b000000
Sending packet: $Hg20ab#d4...Ack
Packet received: OK
Sending packet: $g#67...Ack
Packet received:
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c89d85270181ffff489d85270181ffff00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d0033880ffffffff4600000000000000
Here is the register info after I issued thread
(gdb) info regi
rax 0x0 0
rbx 0x0 0
rcx 0x0 0
rdx 0x0 0
rsi 0x0 0
rdi 0x0 0
rbp 0xffff810127923dc8 0xffff810127923dc8
rsp 0xffff810127923d48 0xffff810127923d48
r8 0x0 0
r9 0x0 0
r10 0x0 0
r11 0x0 0
r12 0x0 0
r13 0x0 0
r14 0x0 0
r15 0x0 0
rip 0xffffffff803803d0 0xffffffff803803d0 <thread_return>
eflags 0x46 70
cs 0x0 0
ss 0x0 0
ds 0x0 0
es 0x0 0
fs 0x0 0
---Type <return> to continue, or q <return> to quit---
gs 0x0 0
(gdb)
Here is the gdb packet exchange information when I issue "next" command after
thread switching:
(gdb) n
Sending packet: $Hg34b5#ad...Ack
Packet received: OK
Sending packet: $g#67...Ack
Packet received:
ffffffff0000000060f84780ffffffff2000000000000000000000000000000080926880ffffffff0000000000000000506f6380ffffffff38505280ffffffff00000000000000000000000000000000801902280181ffffe4000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a00004b5d1580ffffffff4602000000000000
Sending packet: $Hg20ad#d6...Ack
Packet received: OK
Sending packet: $g#67...Ack
Packet received:
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c83d92270181ffff483d92270181ffff00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d0033880ffffffff4600000000000000
Sending packet: $Hg34b5#ad...Ack
Packet received: OK
Sending packet: $g#67...Ack
Packet received:
ffffffff0000000060f84780ffffffff2000000000000000000000000000000080926880ffffffff0000000000000000506f6380ffffffff38505280ffffffff00000000000000000000000000000000801902280181ffffe4000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a00004b5d1580ffffffff4602000000000000
Sending packet: $vCont?#49...Ack
Packet received:
Packet vCont (verbose-resume) is NOT supported
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $s#73...Ack
Packet received: T05thread:00000000000034b5;
Sending packet: $g#67...Ack
Packet received:
ffffffff0000000060f84780ffffffff2000000000000000000000000000000080926880ffffffff44fd3a80ffffffff506f6380ffffffff38505280ffffffff00000000000000000000000000000000801902280181ffffe4000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a0000525d1580ffffffff4603000000000000
Sending packet: $mffffffff80525040,8#99...Ack
Packet received: 795d1580ffffffff
Sending packet: $s#73...Ack
Packet received: T05thread:00000000000034b5;
Sending packet: $g#67...Ack
Packet received:
000000000000000060f84780ffffffff2000000000000000000000000000000080926880ffffffff44fd3a80ffffffff506f6380ffffffff38505280ffffffff00000000000000000000000000000000801902280181ffffe4000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a0000545d1580ffffffff4603000000000000
Sending packet: $s#73...Ack
Packet received: T05thread:00000000000034b5;
Sending packet: $g#67...Ack
Packet received:
000000000000000060f84780ffffffff2000000000000000000000000000000080926880ffffffff44fd3a80ffffffff506f6380ffffffff30505280ffffffff00000000000000000000000000000000801902280181ffffe4000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a0000602d1380ffffffff4603000000000000
Sending packet: $mffffffff80525030,8#98...Ack
Packet received: 595d1580ffffffff
Sending packet: $Z0,ffffffff80155d59,1#18...Ack
Packet received: OK
Packet Z0 (software-breakpoint) is supported
Sending packet: $c#63...Ack
Packet received: T05thread:00000000000034b5;
Sending packet: $g#67...Ack
Packet received:
05000000000000000400000000000000406e5f80ffffffff0000000000000000c7b300000000000040c14780ffffffff506f6380ffffffff38505280ffffffff00000000000000000000000000000000000000000000000000000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a00005a5d1580ffffffff9602000000000000
Sending packet: $P10=595d1580ffffffff#f3...Ack
Packet received:
Sending packet:
$G05000000000000000400000000000000406e5f80ffffffff0000000000000000c7b300000000000040c14780ffffffff506f6380ffffffff38505280ffffffff00000000000000000000000000000000000000000000000000000000000000000a0000000000000060d3cdaaaa2a0000000000000000000060d3cdaaaa2a0000595d1580ffffffff9602000000000000#3a...Ack
Packet received: OK
Sending packet: $z0,ffffffff80155d59,1#38...Ack
Packet received: OK
Sending packet: $mffffffff80525040,8#99...Ack
Packet received: 795d1580ffffffff
breakpoint () at kernel/kgdb.c:1823
1823 ;
The issue is it is still in kgdb.c, not switch to my tom_ext3_1 thread.
Thanks!
Jinggang
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