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Message-Id: <1286998463.4893.26.camel@subratamodak.linux.ibm.com>
Date: Thu, 14 Oct 2010 01:04:22 +0530
From: Subrata Modak <subrata@...ux.vnet.ibm.com>
To: linux-kernel <linux-kernel@...r.kernel.org>,
Linuxppc-dev <Linuxppc-dev@...abs.org>
Cc: Li Zefan <lizf@...fujitsu.com>,
Peter Zijlstra <peterz@...radead.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [2.6.36-rc7, Power6] LTP Ftrace Stress tests causes KERNEL PANIC
and brings the system to xmon
Hi,
Executing LTP Ftrace Stress tests on 2.6.36-rc7, Power6 creates kernel
Panic and xmon is invoked:
Ways to reproduce the problem:
Download latest LTP git via:
git://ltp.git.sourceforge.net/gitroot/ltp/ltp
cd ltp
./configure
make
make install
cd /opt/ltp
./runltp -f tracing
You will notice the following kernel panic. Other information from xmon
debugger is also provided. Please note that this was originally discovered in
stable 2.6.35.4. And then again reproduced on 2.6.36-rc7:
================================================
Running tests.......
<<<test_start>>>
tag=ftrace-stress-test stime=1286980645
cmdline="ftrace_stress_test.sh 90"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
mkdir: cannot create directory `/opt/ltp/testcases/bin/debugfs': File
exists
Ftrace Stress Test Begin
Unable to handle kernel paging request for data at address
0xbffffffe0175b688
Unable to handle kernel paging request for data at address
0xbffffffe0175b688
Faulting instruction address: 0xc000000000101414
cpu 0Faulting instrucxtion address: 0x1c000000000101414:
Vector: 300 (Data Access) at [c0000000d4a8ed10]
pc: c000000000101414: .update_curr+0x31c/0x410
lr: c0000000001013a4: .update_curr+0x2ac/0x410
sp: c0000000d4a8ef90
msr: 8000000000001032
dar: bffffffe0175b688
dsisr: 40000000
current = 0xc0000000d49c1b00
paca = 0xc000000007fc8700
pid = 1667, comm = ftrace_profile_
enter ? for help
[c0000000d4a8f040] c00000000010164c .task_tick_fair+0x88/0x30c
[c0000000d4a8f0f0] c00000000011f3a0 .scheduler_tick+0x228/0x6f0
[c0000000d4a8f1a0] c0000000001494e4 .update_process_times+0xd0/0x120
[c0000000d4a8f240] c00000000018f7d4 .tick_sched_timer+0x114/0x194
[c0000000d4a8f2f0] c000000000178678 .__run_hrtimer+0x28c/0x3d8
[c0000000d4a8f3a0] c000000000178cd8 .hrtimer_interrupt+0x18c/0x3c8
[c0000000d4a8f4b0] c0000000000448f0 .timer_interrupt+0x2b8/0x514
[c0000000d4a8f550] c000000000003728 decrementer_common+0x128/0x180
--- Exception: 901 (Decrementer) at
c0000000000f99a4 .mutex_spin_on_owner+0x110/0x1bc
[c0000000d4a8f8d0] c000000000bcf600 .__mutex_lock_slowpath+0xe0/0x3f0
[c0000000d4a8f9c0] c000000000bd0520 .mutex_lock+0xb0/0xe4
[c0000000d4a8fa50] c000000000211978 .tracepoint_probe_unregister
+0x58/0x12c
[c0000000d4a8fb00] c00000000021a078 .unregister_ftrace_graph+0xc4/0x114
[c0000000d4a8fb90] c00000000021b864 .ftrace_profile_write+0x4b0/0x530
[c0000000d4a8fcc0] c00000000031e35c .vfs_write+0x1ac/0x338
[c0000000d4a8fd70] c000000000009794 .return_to_handler+0x0/0x34
[c0000000d4a8fe30] c000000000009794 .return_to_handler+0x0/0x34
--- Exception: c00 (System Call) at 000000000fecfc94
SP (ffdcf9c0) is in userspace
1:mon> cpu 0x0: Vector: 300 (Data Access) at [c0000000cfa0f5f0]
pc: c000000000101414: .update_curr+0x31c/0x410
lr: c0000000001013a4: .update_curr+0x2ac/0x410
sp: c0000000cfa0f870
msr: 8000000000001032
dar: bffffffe0175b688
dsisr: 40000000
current = 0xc0000000d48cb600
paca = 0xc000000007fc8000
pid = 1909, comm = cat
1:mon>
1:mon> e
cpu 0x1: Vector: 300 (Data Access) at [c0000000d4a8ed10]
pc: c000000000101414: .update_curr+0x31c/0x410
lr: c0000000001013a4: .update_curr+0x2ac/0x410
sp: c0000000d4a8ef90
msr: 8000000000001032
dar: bffffffe0175b688
dsisr: 40000000
current = 0xc0000000d49c1b00
paca = 0xc000000007fc8700
pid = 1667, comm = ftrace_profile_
1:mon> dl
<4>------------[ cut here ]------------
<4>WARNING: at kernel/trace/ring_buffer.c:2227
<4>Modules linked in: sunrpc ipv6 uinput ehea ibmvscsic
scsi_transport_srp scsi_tgt [last unloaded: scsi_wait_scan]
<4>NIP: c000000000222b3c LR: c000000000222b1c CTR: 0000000000000001
<4>REGS: c0000000d4a89670 TRAP: 0700 Not tainted (2.6.36-rc7)
<4>MSR: 8000000000021032 <ME,CE,IR,DR> CR: 48242482 XER: 20000000
<4>TASK = c0000000d49c1b00[1667] 'ftrace_profile_' THREAD:
c0000000d4a8c000 CPU: 1
<4>GPR00: 0000000000000001 c0000000d4a898f0 c0000000017354c0
0000000000000036
<4>GPR04: 0000000000000000 ffffffffffffffff 0000000000000007
0000000000f791ca
<4>GPR08: 0000000000f80c95 c00000000187d8a8 c0000000018803d0
0000000000000001
<4>GPR12: 0000000028242482 c000000007fc8700 0000000000000000
00000000100f0000
<4>GPR16: 00000000100f4a54 00000000100d3650 00000000100f4bfc
00000000100f4b6c
<4>GPR20: 000000000000001c 0000000000000001 c0000000d4a89e40
c000000001879e88
<4>GPR24: 0000000000000000 0000000000000000 c000000001640248
0000000000000000
<4>GPR28: 0000000000000010 c00000000187d8a8 c0000000016a9400
c0000000d4a898f0
<4>NIP [c000000000222b3c] .ring_buffer_lock_reserve+0x1a0/0x2a4
<4>LR [c000000000222b1c] .ring_buffer_lock_reserve+0x180/0x2a4
<4>Call Trace:
<4>Instruction dump:
<4>54c7014a 78c585a2 78c6c622 489c22a5 60000000 e93e8000 e95e8030
e9691d90
<4>880a0013 396b0001 68000001 f9691d90 <0b000000> e93e8000 2fa00000
e9691da0
<4>---[ end trace 54ff4f71b2972eb9 ]---
<1>Unable to handle kernel paging request for data at address
0xbffffffe0175b688
<1>Unable to handle kernel paging request for data at address
0xbffffffe0175b688
<1>Faulting instruction address: 0xc000000000101414
<1>Faulting instruction address: 0xc000000000101414
1:mon> r
R00 = 000000000003b578 R16 = c0000000d4a8f420
R01 = c0000000d4a8ef90 R17 = c000000001c45688
R02 = c0000000017354c0 R18 = c0000000d4a8f410
R03 = 0000000000000000 R19 = 0000000000000000
R04 = 0000000000000030 R20 = 0000000000000000
R05 = 0000000000000030 R21 = c000000001817610
R06 = 0000000000000000 R22 = 7fffffffffffffff
R07 = 000000000003b5d2 R23 = 0000000000000001
R08 = fffffffe00000000 R24 = c0000000017e0800
R09 = c0000000de004580 R25 = 0000003c9482245c
R10 = c00000000175b688 R26 = 000000038aa347f0
R11 = c0000000017d0800 R27 = c0000000d49c1b00
R12 = 0000000028242428 R28 = c0000000d087f820
R13 = c000000007fc8700 R29 = 00000000008b9528
R14 = 0000000000000000 R30 = c0000000016a3d48
R15 = 00000000100f0000 R31 = c0000000d4a8ef90
pc = c000000000101414 .update_curr+0x31c/0x410
lr = c0000000001013a4 .update_curr+0x2ac/0x410
msr = 8000000000001032 cr = 28242428
ctr = c0000000000fdbfc xer = 0000000000000000 trap = 300
dar = bffffffe0175b688 dsisr = 40000000
1:mon> S
msr = 8000000000001032 sprg0= 0000000000000000
pvr = 00000000003e0400 sprg1= c000000007fc8700
dec = 0000000078006b92 sprg2= c000000007fc8700
sp = c0000000d4a8e680 sprg3= 0000000000000001
toc = c0000000017354c0 dar = bffffffe0175b688
1:mon> t
[c0000000d4a8f040] c00000000010164c .task_tick_fair+0x88/0x30c
[c0000000d4a8f0f0] c00000000011f3a0 .scheduler_tick+0x228/0x6f0
[c0000000d4a8f1a0] c0000000001494e4 .update_process_times+0xd0/0x120
[c0000000d4a8f240] c00000000018f7d4 .tick_sched_timer+0x114/0x194
[c0000000d4a8f2f0] c000000000178678 .__run_hrtimer+0x28c/0x3d8
[c0000000d4a8f3a0] c000000000178cd8 .hrtimer_interrupt+0x18c/0x3c8
[c0000000d4a8f4b0] c0000000000448f0 .timer_interrupt+0x2b8/0x514
[c0000000d4a8f550] c000000000003728 decrementer_common+0x128/0x180
--- Exception: 901 (Decrementer) at
c0000000000f99a4 .mutex_spin_on_owner+0x110/0x1bc
[c0000000d4a8f8d0] c000000000bcf600 .__mutex_lock_slowpath+0xe0/0x3f0
[c0000000d4a8f9c0] c000000000bd0520 .mutex_lock+0xb0/0xe4
[c0000000d4a8fa50] c000000000211978 .tracepoint_probe_unregister
+0x58/0x12c
[c0000000d4a8fb00] c00000000021a078 .unregister_ftrace_graph+0xc4/0x114
[c0000000d4a8fb90] c00000000021b864 .ftrace_profile_write+0x4b0/0x530
[c0000000d4a8fcc0] c00000000031e35c .vfs_write+0x1ac/0x338
[c0000000d4a8fd70] c000000000009794 .return_to_handler+0x0/0x34
[c0000000d4a8fe30] c000000000009794 .return_to_handler+0x0/0x34
--- Exception: c00 (System Call) at 000000000fecfc94
SP (ffdcf9c0) is in userspace
1:mon> u
SLB contents of cpu 1
00 c000000008000000 40004f7ca3000500 1T ESID= c00000 VSID=
4f7ca3 LLP:100
01 d000000008000000 4000eb71b0000400 1T ESID= d00000 VSID=
eb71b0 LLP: 0
14 0000000008000000 0000489b22861c80 256M ESID= 0 VSID=
489b22861 LLP: 0
15 00000000f8000000 000053d29a3f6c80 256M ESID= f VSID=
53d29a3f6 LLP: 0
16 0000000018000000 0000495a90e7cc80 256M ESID= 1 VSID=
495a90e7c LLP: 0
17 f000000008000000 4000235bcc000500 1T ESID= f00000 VSID=
235bcc LLP:100
18 bffffffe08000000 0000000000000c80 256M ESID=bffffffe0 VSID=
0 LLP: 0
1:mon>
================================================
However Peter Zijlstraś proposed patch did not fix this issue. The patch
was
posted to LTP:
http://marc.info/?l=ltp-list&m=128696942432669&w=2
The Kernel paniked even after the patch. However this time th message was
different. Other xmon output is also shown below:
================================================
Ftrace Stress Test Begin
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc0000000002133f0
cpu 0x2: Vector: 300 (Data Access) at [c0000000d9f8b560]
pc: c0000000002133f0: .trace_clock_global+0xb4/0x2a0
lr: c000000000213458: .trace_clock_global+0x11c/0x2a0
sp: c0000000d9f8b7e0
msr: 800000000200b032
dar: 0
dsisr: 40000000
current = 0xc0000000d9f7d100
paca = 0xc000000007fc8e00
pid = 1667, comm = ftrace_stack_tr
Unrecoverable FP Unavailable Exception 800 at c0000000016a9540
cpu 0x0: Vector: 8Unable to handle0 kernel paging r0 equest for data (at
address 0xbffFffffe0175b688
PU UnavaFaulting instruciltion address: 0xac0000000001017fcb
le) at [c0000000d9f8a6a0]
p pc: c0000000016a9540: etnetre r? ?f ofro rh ehlepl
lr: [c000000000016a9540: key_type_dns_resolver+0x15110/0x365f8
sp: c0000000018804e8
msr: 8000000000001032
current = 0xc0000000d838d100
paca = 0xc000000007fc8000
pid = 1668, comm = ftrace_stack_ma
pid = 1668, cc0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8b9b0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8ba40] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8baf0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8bb80] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8bc40] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8bcd0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8bd40] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8bdd0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8be90] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8bfa0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8c030] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8c0e0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8c170] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8c230] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8c2c0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8c330] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8c3c0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8c480] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8c590] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8c620] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8c6d0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8c760] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8c820] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8c8b0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8c920] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8c9b0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8ca70] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8cb80] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8cc10] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8ccc0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8cd50] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8ce10] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8cea0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8cf10] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8cfa0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8d060] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8d170] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8d200] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8d2b0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8d340] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8d400] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8d490] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8d500] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8d590] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8d650] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8d760] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8d7f0] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8d8a0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8d930] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8d9f0] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8da80] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8daf0] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8db80] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8dc40] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8dd50] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8dde0] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8de90] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8df20] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8dfe0] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8e070] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8e0e0] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8e170] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8e230] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
2:mon> cpu 0x1: Vector: 300 (Data Access) at [c0000000d9fab5f0]
pc: c0000000001017fc: .update_curr+0x31c/0x410
lr: c00000000010178c: .update_curr+0x2ac/0x410
sp: c0000000d9fab870
msr: 8000000000001032
dar: bffffffe0175b688
dsisr: 40000000
current = 0xc0000000d9fa0000
paca = 0xc000000007fc8700
pid = 1669, comm = ftrace_tracing_
2:mon> e
cpu 0x2: Vector: 300 (Data Access) at [c0000000d9f8b560]
pc: c0000000002133f0: .trace_clock_global+0xb4/0x2a0
lr: c000000000213458: .trace_clock_global+0x11c/0x2a0
sp: c0000000d9f8b7e0
msr: 800000000200b032
dar: 0
dsisr: 40000000
current = 0xc0000000d9f7d100
paca = 0xc000000007fc8e00
pid = 1667, comm = ftrace_stack_tr
2:mon> dl
<4>------------[ cut here ]------------
<4>WARNING: at kernel/trace/ring_buffer.c:2227
<4>Modules linked in: sunrpc ipv6 uinput ehea ibmvscsic scsi_transport_srp
scsi_tgt [last unloaded: scsi_wait_scan]
<4>NIP: c0000000002230cc LR: c0000000002230ac CTR: 0000000000000001
<4>REGS: c0000000d9f89f70 TRAP: 0700 Not tainted (2.6.36-rc7)
<4>MSR: 8000000000021032 <ME,CE,IR,DR> CR: 48842482 XER: 20000000
<4>TASK = c0000000d838d100[1668] 'ftrace_stack_ma' THREAD: c0000000d9f8c000
CPU: 0
<4>GPR00: 0000000000000001 c0000000d9f8a1f0 c000000001735590 0000000000000036
<4>GPR04: 0000000000000000 ffffffffffffffff 0000000000000007 0000000001d86c30
<4>GPR08: 0000000001d88a6b c00000000187d9a8 c0000000018804d0 0000000000000001
<4>GPR12: 0000000028842482 c000000007fc8000 0000000000000002 00000000100f765c
<4>GPR16: 00000000100d22f8 00000000100f9790 000000000000001e 0000000000000001
<4>GPR20: 000000000000001c 0000000000000001 c0000000d9f8a740 c000000001879f88
<4>GPR24: 0000000000000000 0000000000000000 c000000001640248 0000000000000000
<4>GPR28: 0000000000000010 c00000000187d9a8 c0000000016a9400 c0000000d9f8a1f0
<4>NIP [c0000000002230cc] .ring_buffer_lock_reserve+0x1a0/0x2a4
<4>LR [c0000000002230ac] .ring_buffer_lock_reserve+0x180/0x2a4
<4>Call Trace:
<4>Instruction dump:
<4>54c7014a 78c585a2 78c6c622 489c22c5 60000000 e93e8000 e95e8030 e9691d90
<4>880a0013 396b0001 68000001 f9691d90 <0b000000> e93e8000 2fa00000 e9691da0
<4>---[ end trace f749046f770eb249 ]---
<1>Unable to handle kernel paging request for data at address 0x00000000
<1>Faulting instruction address: 0xc0000000002133f0
<0>Unrecoverable FP Unavailable Exception 800 at c0000000016a9540
<1>Unable to handle kernel paging request for data at address
0xbffffffe0175b688
<1>Faulting instruction address: 0xc0000000001017fc
2:mon> r
R00 = 0000000000000377 R16 = c0000000d9f8b650
R01 = c0000000d9f8b7e0 R17 = 0000000000000000
R02 = c000000001735590 R18 = 0000000000000000
R03 = 0000000000000000 R19 = c0000000ccc7d3b8
R04 = 0000000000000020 R20 = 0000000000000000
R05 = 0000000000000020 R21 = 00000000000000d0
R06 = 0000000000000001 R22 = c0000000de004e00
R07 = 0000000000000000 R23 = 0000000000000000
R08 = 0000000000025420 R24 = c000000001879f00
R09 = 0000000080000002 R25 = 0000000000000000
R10 = 00000000e26ea160 R26 = c000000001879e00
R11 = 000000000010c146 R27 = 0000003c5f642816
R12 = 0000000000000002 R28 = c000000001879e00
R13 = c000000007fc8e00 R29 = c000000001879e00
R14 = 0000000000000000 R30 = c0000000016a9128
R15 = 00000000100f0000 R31 = c0000000d9f8b7e0
pc = c0000000002133f0 .trace_clock_global+0xb4/0x2a0
lr = c000000000213458 .trace_clock_global+0x11c/0x2a0
msr = 800000000200b032 cr = 28842442
ctr = c000000000011d24 xer = 0000000000000000 trap = 300
dar = 0000000000000000 dsisr = 40000000
2:mon> S
msr = 8000000000001032 sprg0= 0000000000000000
pvr = 00000000003e0400 sprg1= c000000007fc8e00
dec = 000000007b5e21d9 sprg2= c000000007fc8e00
sp = c0000000d9f8aed0 sprg3= 0000000000000002
toc = c000000001735590 dar = 0000000000000000
2:mon> t
[c0000000d9f8b8a0] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8b9b0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8ba40] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8baf0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8bb80] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8bc40] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8bcd0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8bd40] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8bdd0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8be90] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8bfa0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8c030] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8c0e0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8c170] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8c230] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8c2c0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8c330] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8c3c0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8c480] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8c590] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8c620] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8c6d0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8c760] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8c820] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8c8b0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8c920] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8c9b0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8ca70] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8cb80] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8cc10] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8ccc0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8cd50] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8ce10] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8cea0] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8cf10] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8cfa0] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8d060] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8d170] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8d200] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8d2b0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8d340] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8d400] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8d490] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8d500] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8d590] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8d650] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8d760] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8d7f0] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8d8a0] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8d930] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8d9f0] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8da80] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8daf0] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8db80] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8dc40] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
[c0000000d9f8dd50] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x2a4
[c0000000d9f8dde0] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0xe4
[c0000000d9f8de90] c00000000022ec9c
.trace_current_buffer_lock_reserve+0x44/0x6c
[c0000000d9f8df20] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c/0x144
[c0000000d9f8dfe0] c000000000096624 .__trace_hcall_entry+0xa0/0xec
[c0000000d9f8e070] c00000000009786c .plpar_hcall_norets+0x50/0xd0
[c0000000d9f8e0e0] c0000000000749c8 .__spin_yield+0x130/0x15c
[c0000000d9f8e170] c000000000213458 .trace_clock_global+0x11c/0x2a0
[c0000000d9f8e230] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804
2:mon> u
SLB contents of cpu 2
00 c000000008000000 40004f7ca3000500 1T ESID= c00000 VSID= 4f7ca3
LLP:100
01 d000000008000000 4000eb71b0000400 1T ESID= d00000 VSID= eb71b0
LLP: 0
28 f000000008000000 4000235bcc000500 1T ESID= f00000 VSID= 235bcc
LLP:100
38 0000000008000000 0000da39727a1c80 256M ESID= 0 VSID= da39727a1
LLP: 0
39 00000000f8000000 0000e570ea336c80 256M ESID= f VSID= e570ea336
LLP: 0
40 0000000018000000 0000daf8e0dbcc80 256M ESID= 1 VSID= daf8e0dbc
LLP: 0
================================================
Regards--
Subrata
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