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....... <<>> tag=ftrace-stress-test stime=1286980645 cmdline="ftrace_stress_test.sh 90" contacts="" analysis=exit <<>> 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 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 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