Hello, I am using LTTng version 0.178 on linux 2.6.31.6 patched with rt prempt patch-2.6.31.6-rt19 LTT control version is 0.79
This is running on Celeron M 370 processor (1.5GHz) board. *I am getting the following oops - * $ lttctl -C -w /home/app1/trace7 trace7 Linux Trace Toolkit Trace Control 0.79-01022010 Controlling trace : trace7 lttctl: Creating trace lttctl: Forking lttd Linux Trace Toolkit Trace Daemon 0.79-01022010 ReadingBUG: unable to handle kernel NULL pointer dereference at 00000008 IP: [<c10f4f0b>] plist_add+0x1b/0x90 *pde = 00000000 Oops: 0000 [#1] PREEMPT LTT NESTING LEVEL : 0 last sysfs file: Modules linked in: Pid: 839, comm: lttctl Not tainted (2.6.31.6-rt19 #3) H6037 EIP: 0060:[<c10f4f0b>] EFLAGS: 00010046 CPU: 0 EIP is at plist_add+0x1b/0x90 EAX: 00000004 EBX: c1266120 ECX: cf261e74 EDX: c1266120 ESI: cf261e7c EDI: cf2ce750 EBP: 00000008 ESP: cf261e18 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 preempt:00000002 Process lttctl (pid: 839, ti=cf260000 task=cf2ce750 task.ti=cf260000) Stack: cf261e88 cf261e68 c1265dfc cf2ce750 c1265e0c c103eb41 00000001 00000041 <0> cf261e74 cf261e68 c1266120 00000000 00000282 c1265dfc ffffffff c11dd97c <0> 00000000 00000282 cec98cfc c1265e04 00000078 c1265dfc c1265dfc c1265e04 Call Trace: [<c103eb41>] ? task_blocks_on_rt_mutex+0x141/0x1c0 [<c11dd97c>] ? rt_spin_lock_slowlock+0x18c/0x200 [<c10e4d9d>] ? ltt_statedump_start+0x2fd/0x7a0 [<c104a6ee>] ? marker_probe_cb+0x4e/0xc0 [<c10de3d2>] ? ltt_trace_start+0x122/0x270 [<c10e70e8>] ? enabled_write+0xd8/0x160 [<c10e7010>] ? enabled_write+0x0/0x160 [<c106dfd0>] ? vfs_write+0x90/0xc0 [<c106e173>] ? sys_write+0x53/0xf0 [<c1002eb1>] ? syscall_call+0x7/0xb Code: 04 89 50 10 8b 7c 24 08 83 c4 0c c3 8d 74 26 00 55 57 56 89 c6 53 89 d3 83 ec 04 8d 40 0c 3b 46 0c 89 04 24 75 67 8b 2b 8d 45 fc <8b> 50 04 0f 18 02 90 39 dd 89 e9 74 1f 8b 3e 3b 7d fc 7c 18 90 EIP: [<c10f4f0b>] plist_add+0x1b/0x90 SS:ESP 0068:cf261e18 CR2: 0000000000000008 ---[ end trace 18077621483d0c39 ]--- note: lttctl[839] exited with preempt_count 2 from debugfs directory : /mnt/debugfs/ltt/trace7 Writing to trace directory : /home/app1/trace7 lttctl: Starting trace Killed $ Clocksource tsc unstable (delta = 146049025 ns) *Following are excerpts from the kernel config - *# # GCOV-based kernel profiling # # CONFIG_GCOV_KERNEL is not set # CONFIG_SLOW_WORK is not set CONFIG_LTT=y CONFIG_LTT_FILTER=y CONFIG_HAVE_LTT_DUMP_TABLES=y CONFIG_LTT_RELAY=y CONFIG_LTT_RELAY_LOCKLESS=y # CONFIG_LTT_RELAY_IRQOFF is not set # CONFIG_LTT_RELAY_LOCKED is not set CONFIG_LTT_SERIALIZE=y CONFIG_LTT_FAST_SERIALIZE=y CONFIG_LTT_TRACEPROBES=y CONFIG_LTT_TRACE_CONTROL=y CONFIG_LTT_TRACER=y CONFIG_LTT_ALIGNMENT=y CONFIG_LTT_CHECK_ARCH_EFFICIENT_UNALIGNED_ACCESS=y # CONFIG_LTT_DEBUG_EVENT_SIZE is not set CONFIG_LTT_USERSPACE_EVENT=y CONFIG_LTT_VMCORE=y CONFIG_LTT_STATEDUMP=y # CONFIG_LTT_ASCII is not set CONFIG_HAVE_IMMEDIATE=y CONFIG_IMMEDIATE=y CONFIG_HAVE_GENERIC_DMA_COHERENT=y CONFIG_SLABINFO=y CONFIG_RT_MUTEXES=y CONFIG_BASE_SMALL=0 CONFIG_MODULES=y CONFIG_MODULE_FORCE_LOAD=y CONFIG_MODULE_UNLOAD=y # CONFIG_MODULE_FORCE_UNLOAD is not set # CONFIG_MODVERSIONS is not set # CONFIG_MODULE_SRCVERSION_ALL is not set CONFIG_BLOCK=y # CONFIG_LBDAF is not set CONFIG_BLK_DEV_BSG=y # CONFIG_BLK_DEV_INTEGRITY is not set # # RCU Subsystem # # CONFIG_CLASSIC_RCU is not set # CONFIG_TREE_RCU is not set CONFIG_PREEMPT_RCU=y # CONFIG_RCU_TRACE is not set # CONFIG_TREE_RCU_TRACE is not set # CONFIG_PREEMPT_RCU_TRACE is not set # CONFIG_IKCONFIG is not set CONFIG_LOG_BUF_SHIFT=17 CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y CONFIG_HAVE_GET_CYCLES=y CONFIG_HAVE_TRACE_CLOCK=y # CONFIG_HAVE_TRACE_CLOCK_GENERIC is not set # CONFIG_HAVE_TRACE_CLOCK_32_TO_64 is not set # CONFIG_HAVE_UNSYNCHRONIZED_TSC is not set # CONFIG_GROUP_SCHED is not set # CONFIG_CGROUPS is not set # CONFIG_SYSFS_DEPRECATED_V2 is not set # CONFIG_RELAY is not set # CONFIG_NAMESPACES is not set # CONFIG_BLK_DEV_INITRD is not set # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set CONFIG_SYSCTL=y CONFIG_ANON_INODES=y CONFIG_EMBEDDED=y CONFIG_UID16=y CONFIG_SYSCTL_SYSCALL=y CONFIG_KALLSYMS=y # CONFIG_KALLSYMS_EXTRA_PASS is not set CONFIG_HOTPLUG=y CONFIG_PRINTK=y CONFIG_BUG=y CONFIG_ELF_CORE=y CONFIG_PCSPKR_PLATFORM=y CONFIG_BASE_FULL=y CONFIG_FUTEX=y CONFIG_EPOLL=y CONFIG_SIGNALFD=y CONFIG_TIMERFD=y CONFIG_EVENTFD=y CONFIG_SHMEM=y CONFIG_AIO=y CONFIG_HAVE_PERF_COUNTERS=y * * Do let me know if you need the entire .config file or any other details I would appreciate any kind of help with this issue. Thanks in adv rachana
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