On Thu, Jul 31, 2014 at 4:32 AM, Fengguang Wu <fengguang...@intel.com> wrote: > Hi Stephane, > > On Wed, Jul 30, 2014 at 07:56:11PM +0200, Stephane Eranian wrote: >> On Wed, Jul 30, 2014 at 7:53 AM, Fengguang Wu <fengguang...@intel.com> wrote: >> > On Wed, Jul 30, 2014 at 06:45:58AM +0200, Stephane Eranian wrote: >> >> On Wed, Jul 30, 2014 at 6:00 AM, Fengguang Wu <fengguang...@intel.com> >> >> wrote: >> >> > Greetings, >> >> > >> >> > 0day kernel testing robot got the below dmesg and the first bad commit >> >> > is >> >> > >> >> Is this booting a guest kernel or native? >> > >> > It's a guest kernel. >> > >> >> What is the host CPU? >> > >> > The host CPU is E5-2680, Sandy Bridge-EP. >> > >> I thought this problem had already be mentioned a while back. >> >> See https://lkml.org/lkml/2014/3/6/685 >> And https://lkml.org/lkml/2014/4/23/512 >> >> So what you are telling here is that those two fixes never made it or >> that you are >> running an older kernel. > > I just checked linux-next and find that the bug in rapl_pmu_init() has > been fixed. linux-next happen to have the same "BUG: unable to handle > kernel NULL pointer dereference" message but at another function > validate_chain().. Attached is the dmesg in linux-next. > > Sorry for the noise! > Is it fixed with the two patches I referred you to?
> Thanks, > Fengguang > >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master >> >> > commit 4788e5b4b2338f85fa42a712a182d8afd65d7c58 >> >> > Author: Stephane Eranian <eran...@google.com> >> >> > AuthorDate: Tue Nov 12 17:58:50 2013 +0100 >> >> > Commit: Ingo Molnar <mi...@kernel.org> >> >> > CommitDate: Wed Nov 27 11:16:40 2013 +0100 >> >> > >> >> > perf/x86: Add Intel RAPL PMU support >> >> > >> >> > This patch adds a new uncore PMU to expose the Intel >> >> > RAPL energy consumption counters. Up to 3 counters, >> >> > each counting a particular RAPL event are exposed. >> >> > >> >> > The RAPL counters are available on Intel SandyBridge, >> >> > IvyBridge, Haswell. The server skus add a 3rd counter. >> >> > >> >> > The following events are available and exposed in sysfs: >> >> > >> >> > - power/energy-cores: power consumption of all cores on socket >> >> > - power/energy-pkg: power consumption of all cores + LLc cache >> >> > - power/energy-dram: power consumption of DRAM (servers only) >> >> > >> >> > For each event both the unit (Joules) and scale (2^-32 J) >> >> > is exposed in sysfs for use by perf stat and other tools. >> >> > The files are: >> >> > >> >> > /sys/devices/power/events/energy-*.unit >> >> > /sys/devices/power/events/energy-*.scale >> >> > >> >> > The RAPL PMU is uncore by nature and is implemented such >> >> > that it only works in system-wide mode. Measuring only >> >> > one CPU per socket is sufficient. The /sys/devices/power/cpumask >> >> > file can be used by tools to figure out which CPUs to monitor >> >> > by default. For instance, on a 2-socket system, 2 CPUs >> >> > (one on each socket) will be shown. >> >> > >> >> > All the counters measure in the same unit (exposed via sysfs). >> >> > The perf_events API exposes all RAPL counters as 64-bit integers >> >> > counting in unit of 1/2^32 Joules (about 0.23 nJ). User level tools >> >> > must convert the counts by multiplying them by 2^-32 to obtain >> >> > Joules. The reason for this is that the kernel avoids >> >> > doing floating point math whenever possible because it is >> >> > expensive (user floating-point state must be saved). The method >> >> > used avoids kernel floating-point usage. There is no loss of >> >> > precision. Thanks to PeterZ for suggesting this approach. >> >> > >> >> > To convert the raw count in Watt: >> >> > W = C * 2.3 / (1e10 * time) >> >> > or ldexp(C, -32). >> >> > >> >> > RAPL PMU is a new standalone PMU which registers with the >> >> > perf_event core subsystem. The PMU type (attr->type) is >> >> > dynamically allocated and is available from /sys/device/power/type. >> >> > >> >> > Sampling is not supported by the RAPL PMU. There is no >> >> > privilege level filtering either. >> >> > >> >> > Signed-off-by: Stephane Eranian <eran...@google.com> >> >> > Reviewed-by: Maria Dimakopoulou <maria.n.dimakopou...@gmail.com> >> >> > Reviewed-by: Andi Kleen <a...@linux.intel.com> >> >> > Signed-off-by: Peter Zijlstra <pet...@infradead.org> >> >> > Cc: a...@redhat.com >> >> > Cc: jo...@redhat.com >> >> > Cc: zheng.z....@intel.com >> >> > Cc: b...@alien8.de >> >> > Link: >> >> > http://lkml.kernel.org/r/1384275531-10892-4-git-send-email-eran...@google.com >> >> > Signed-off-by: Ingo Molnar <mi...@kernel.org> >> >> > >> >> > +-----------------------------------------------------------+------------+------------+---------------+ >> >> > | | >> >> > 410136f5dd | 4788e5b4b2 | next-20140724 | >> >> > +-----------------------------------------------------------+------------+------------+---------------+ >> >> > | boot_successes | 1000 >> >> > | 751 | 78 | >> >> > | boot_failures | 0 >> >> > | 149 | 3 | >> >> > | BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 >> >> > | 132 | 2 | >> >> > | Oops | 0 >> >> > | 132 | 2 | >> >> > | EIP_is_at_rapl_pmu_init | 0 >> >> > | 132 | | >> >> > | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 >> >> > | 132 | 2 | >> >> > | backtrace:rapl_pmu_init | 0 >> >> > | 132 | | >> >> > | backtrace:kernel_init_freeable | 0 >> >> > | 132 | 2 | >> >> > | BUG:kernel_boot_hang | 0 >> >> > | 17 | 1 | >> >> > | EIP_is_at_validate_chain | 0 >> >> > | 0 | 2 | >> >> > | backtrace:free_reserved_area | 0 >> >> > | 0 | 2 | >> >> > | backtrace:free_init_pages | 0 >> >> > | 0 | 2 | >> >> > | backtrace:populate_rootfs | 0 >> >> > | 0 | 2 | >> >> > +-----------------------------------------------------------+------------+------------+---------------+ >> >> > >> >> > [ 0.613305] PCI: CLS 0 bytes, default 64 >> >> > [ 0.614699] Unpacking initramfs... >> >> > [ 0.732188] Freeing initrd memory: 3276K (d3cbd000 - d3ff0000) >> >> > [ 0.733895] BUG: unable to handle kernel NULL pointer dereference at >> >> > 00000028 >> >> > [ 0.735603] IP: [<c09b20cb>] rapl_pmu_init+0x11e/0x139 >> >> > [ 0.736012] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 >> >> > [ 0.736012] Oops: 0000 [#1] PREEMPT >> >> > [ 0.736012] Modules linked in: >> >> > [ 0.736012] CPU: 0 PID: 1 Comm: swapper Not tainted >> >> > 3.12.0-05711-g4788e5b #11 >> >> > [ 0.736012] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 >> >> > [ 0.736012] task: d244c020 ti: d244e000 task.ti: d244e000 >> >> > [ 0.736012] EIP: 0060:[<c09b20cb>] EFLAGS: 00010202 CPU: 0 >> >> > [ 0.736012] EIP is at rapl_pmu_init+0x11e/0x139 >> >> > [ 0.736012] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000001 >> >> > [ 0.736012] ESI: c09b1fad EDI: 000000cc EBP: d244ff00 ESP: d244fef0 >> >> > [ 0.736012] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 >> >> > [ 0.736012] CR0: 80050033 CR2: 00000028 CR3: 00a16000 CR4: 000406b0 >> >> > [ 0.736012] Stack: >> >> > [ 0.736012] c04ddabe 00000000 00000002 00000000 d244ff74 c0200477 >> >> > c0251b16 d244ff2c >> >> > [ 0.736012] c025467d d3ff63cb d244ff34 c02410cb d3ff63cb d244ff00 >> >> > c09aa512 c080d71c >> >> > [ 0.736012] 000000cc d244ff74 c02412d5 c0829fe0 00000286 c023b6d8 >> >> > 00000246 00060006 >> >> > [ 0.736012] Call Trace: >> >> > [ 0.736012] [<c04ddabe>] ? register_syscore_ops+0x32/0x35 >> >> > [ 0.736012] [<c0200477>] do_one_initcall+0xdf/0x138 >> >> > [ 0.736012] [<c0251b16>] ? lock_release_holdtime.part.20+0x93/0xf8 >> >> > [ 0.736012] [<c025467d>] ? trace_hardirqs_on_caller+0xeb/0x1ad >> >> > [ 0.736012] [<c02410cb>] ? parameq+0x13/0x5e >> >> > [ 0.736012] [<c09aa512>] ? repair_env_string+0x12/0x51 >> >> > [ 0.736012] [<c02412d5>] ? parse_args+0x1bf/0x2f8 >> >> > [ 0.736012] [<c023b6d8>] ? >> >> > __usermodehelper_set_disable_depth+0x3e/0x44 >> >> > [ 0.736012] [<c09aab46>] kernel_init_freeable+0xde/0x178 >> >> > [ 0.736012] [<c09aa500>] ? do_early_param+0x78/0x78 >> >> > [ 0.736012] [<c064bd10>] kernel_init+0xb/0xed >> >> > [ 0.736012] [<c0249199>] ? schedule_tail+0xc/0x3a >> >> > [ 0.736012] [<c0659637>] ret_from_kernel_thread+0x1b/0x28 >> >> > [ 0.736012] [<c064bd05>] ? rest_init+0xb5/0xb5 >> >> > [ 0.736012] Code: 99 87 ff 89 5c 24 04 c7 04 24 90 bf 76 c0 e8 dd e9 >> >> > c9 ff 83 c8 ff eb 28 a1 44 bc a1 c0 f3 0f b8 c0 90 89 44 24 08 a1 80 73 >> >> > 82 c0 <8b> 40 28 89 44 24 04 c7 04 24 d4 bf 76 c0 e8 b2 e9 c9 ff 31 c0 >> >> > [ 0.736012] EIP: [<c09b20cb>] rapl_pmu_init+0x11e/0x139 SS:ESP >> >> > 0068:d244fef0 >> >> > [ 0.736012] CR2: 0000000000000028 >> >> > [ 0.736012] ---[ end trace 0a81712c9fb36a0a ]--- >> >> > [ 0.736012] swapper (1) used greatest stack depth: 5800 bytes left >> >> > >> >> > git bisect start v3.14 v3.13 -- >> >> > git bisect bad 09df7c4c8097ca4a11393b1edd4997d786daad52 # 16:18 >> >> > 0- 3 x86: Remove CONFIG_X86_OOSTORE >> >> > git bisect bad 15c81026204da897a05424c79263aea861a782cc # 16:24 >> >> > 2- 5 Merge branch 'x86-x32-for-linus' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> > git bisect bad a0fa1dd3cdbccec9597fe53b6177a9aa6e20f2f8 # 16:33 >> >> > 0- 15 Merge branch 'sched-core-for-linus' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> > git bisect good edde1fb8c41d0db7c8ce17fb32886da2e389b0cc # 17:48 >> >> > 900+ 0 Merge tag 'localmodconfig-v3.14' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-kconfig >> >> > git bisect good a693c46e14c9fdadbcd68ddfa94a4f72495531a9 # 17:55 >> >> > 900+ 0 Merge branch 'core-rcu-for-linus' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> > git bisect good 2cc3f16cad1561c6fc551aefff559e53726efc8b # 18:12 >> >> > 900+ 0 Merge branch 'irq-core-for-linus' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> > git bisect bad 9326657abe1a83ed4b4f396b923ca1217fd50cba # 18:21 >> >> > 9- 2 Merge branch 'perf-core-for-linus' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >> >> > git bisect bad 7bb73553e2490ac6667387ee723e0faa61e9d999 # 18:38 >> >> > 0- 1 tools lib traceevent: Get rid of die() in reparent_op_arg() >> >> > git bisect bad 3d7c0144491bd8c21d53b43032274a85efdfe434 # 18:41 >> >> > 11- 4 perf tools: Add build and install plugins targets >> >> > git bisect bad ba1ddf42f3c3af111d3adee277534f73c1ef6a9b # 18:43 >> >> > 0- 15 perf script: Print mmap[2] events also >> >> > git bisect bad a8b4c7014cadfdacd4e1f4c963128593be6f20de # 18:49 >> >> > 0- 2 perf completion: Rename file to reflect zsh support >> >> > git bisect bad 4788e5b4b2338f85fa42a712a182d8afd65d7c58 # 18:53 >> >> > 0- 1 perf/x86: Add Intel RAPL PMU support >> >> > git bisect good c912dae60ae6f659455f239298110adc67a5f3e9 # 19:33 >> >> > 900+ 14 uprobes: Cleanup !CONFIG_UPROBES decls, unexport xol_area >> >> > git bisect good 09897d78dbc3a544426f2272b5601c62922ccab9 # 19:44 >> >> > 900+ 0 Merge branch 'uprobes/core' of >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc into perf/core >> >> > git bisect good 410136f5dd96b6013fe6d1011b523b1c247e1ccb # 19:52 >> >> > 900+ 0 tools/perf/stat: Add event unit and scale support >> >> > # first bad commit: [4788e5b4b2338f85fa42a712a182d8afd65d7c58] >> >> > perf/x86: Add Intel RAPL PMU support >> >> > git bisect good 410136f5dd96b6013fe6d1011b523b1c247e1ccb # 19:56 >> >> > 1000+ 0 tools/perf/stat: Add event unit and scale support >> >> > git bisect bad 1a58d9909611972fd1c081bb04a9f7dc2571e612 # 19:58 >> >> > 0- 3 Add linux-next specific files for 20140724 >> >> > git bisect bad 82e13c71bc655b6dc7110da4e164079dadb44892 # 20:07 >> >> > 448- 10 Merge branch 'for-3.16' of >> >> > git://linux-nfs.org/~bfields/linux >> >> > git bisect bad 5a7439efd1c5c416f768fc550048ca130cf4bf99 # 20:14 >> >> > 2- 6 Add linux-next specific files for 20140725 >> >> > >> >> > >> >> > This script may reproduce the error. >> >> > >> >> > ---------------------------------------------------------------------------- >> >> > #!/bin/bash >> >> > >> >> > kernel=$1 >> >> > initrd=yocto-minimal-i386.cgz >> >> > >> >> > wget --no-clobber >> >> > https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd >> >> > >> >> > kvm=( >> >> > qemu-system-x86_64 >> >> > -enable-kvm >> >> > -cpu Haswell,+smep,+smap >> >> > -kernel $kernel >> >> > -initrd $initrd >> >> > -m 320 >> >> > -smp 1 >> >> > -net nic,vlan=1,model=e1000 >> >> > -net user,vlan=1 >> >> > -boot order=nc >> >> > -no-reboot >> >> > -watchdog i6300esb >> >> > -rtc base=localtime >> >> > -serial stdio >> >> > -display none >> >> > -monitor null >> >> > ) >> >> > >> >> > append=( >> >> > hung_task_panic=1 >> >> > earlyprintk=ttyS0,115200 >> >> > debug >> >> > apic=debug >> >> > sysrq_always_enabled >> >> > rcupdate.rcu_cpu_stall_timeout=100 >> >> > panic=10 >> >> > softlockup_panic=1 >> >> > nmi_watchdog=panic >> >> > prompt_ramdisk=0 >> >> > console=ttyS0,115200 >> >> > console=tty0 >> >> > vga=normal >> >> > root=/dev/ram0 >> >> > rw >> >> > drbd.minor_count=8 >> >> > ) >> >> > >> >> > "${kvm[@]}" --append "${append[*]}" >> >> > ---------------------------------------------------------------------------- >> >> > >> >> > Thanks, >> >> > Fengguang >> >> > >> >> > _______________________________________________ >> >> > LKP mailing list >> >> > l...@linux.intel.com >> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
