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Date: Tue, 07 Jul 2015 14:59:06 +0930 From: Arthur Marsh <arthur.marsh@...ernode.on.net> To: Peter Zijlstra <peterz@...radead.org> CC: linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>, Steven Rostedt <rostedt@...dmis.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Oleg Nesterov <oleg@...hat.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Subject: Re: lock-up with module: Optimize __module_address() using a latched RB-tree I had a single, non-reproducible case of the same lock-up happening on my other machine running the Linus git head kernel in 64-bit mode. The kernel was built very similarly to the 32-bit mode kernel, using: CONCURRENCY_LEVEL=4 MAKEFLAGS="CC=gcc-5 LD=ld.gold KCFLAGS=-march=athlon64" \ make-kpkg --config menuconfig --initrd linux-image That machine has the following cpu: processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 5 model name : AMD Athlon(tm) II X4 640 Processor stepping : 3 microcode : 0x10000c8 cpu MHz : 3000.000 cache size : 512 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save vmmcall bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs bogomips : 6015.47 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate The start of dmesg shows: [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Linux version 4.2.0-rc1+ (root@...4) (gcc version 5.1.1 20150622 (Debian 5.1.1-12) ) #1815 SMP PREEMPT Tue Jul 7 13:13:00 ACST 2015 [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.2.0-rc1+ root=UUID=39706f53-7c27-4310-b22a-36c7b042d1a1 ro radeon.audio=1 [ 0.000000] tseg: 0000000000 [ 0.000000] x86/fpu: Legacy x87 FPU detected. [ 0.000000] x86/fpu: Using 'lazy' FPU context switches. [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000e4000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000cffaffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000cffb0000-0x00000000cffbdfff] ACPI data [ 0.000000] BIOS-e820: [mem 0x00000000cffbe000-0x00000000cffdffff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x00000000cffe0000-0x00000000cfffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff700000-0x00000000ffffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000022fffffff] usable [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] SMBIOS 2.5 present. [ 0.000000] DMI: System manufacturer System Product Name/M3A78 PRO, BIOS 1701 01/27/2011 [ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable [ 0.000000] e820: last_pfn = 0x230000 max_arch_pfn = 0x400000000 [ 0.000000] MTRR default type: uncachable [ 0.000000] MTRR fixed ranges enabled: [ 0.000000] 00000-9FFFF write-back [ 0.000000] A0000-EFFFF uncachable [ 0.000000] F0000-FFFFF write-protect [ 0.000000] MTRR variable ranges enabled: [ 0.000000] 0 base 000000000000 mask FFFF80000000 write-back [ 0.000000] 1 base 000080000000 mask FFFFC0000000 write-back [ 0.000000] 2 base 0000C0000000 mask FFFFF0000000 write-back [ 0.000000] 3 disabled [ 0.000000] 4 disabled [ 0.000000] 5 disabled [ 0.000000] 6 disabled [ 0.000000] 7 disabled [ 0.000000] TOM2: 0000000230000000 aka 8960M [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT [ 0.000000] e820: update [mem 0xd0000000-0xffffffff] usable ==> reserved [ 0.000000] e820: last_pfn = 0xcffb0 max_arch_pfn = 0x400000000 [ 0.000000] found SMP MP-table at [mem 0x000ff780-0x000ff78f] mapped at [ffff8800000ff780] [ 0.000000] Base memory trampoline at [ffff880000098000] 98000 size 28672 [ 0.000000] Using GB pages for direct mapping [ 0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff] [ 0.000000] [mem 0x00000000-0x000fffff] page 4k [ 0.000000] BRK [0x0292e000, 0x0292efff] PGTABLE [ 0.000000] BRK [0x0292f000, 0x0292ffff] PGTABLE [ 0.000000] BRK [0x02930000, 0x02930fff] PGTABLE [ 0.000000] init_memory_mapping: [mem 0x22fe00000-0x22fffffff] [ 0.000000] [mem 0x22fe00000-0x22fffffff] page 2M [ 0.000000] BRK [0x02931000, 0x02931fff] PGTABLE [ 0.000000] init_memory_mapping: [mem 0x220000000-0x22fdfffff] [ 0.000000] [mem 0x220000000-0x22fdfffff] page 2M [ 0.000000] init_memory_mapping: [mem 0x200000000-0x21fffffff] [ 0.000000] [mem 0x200000000-0x21fffffff] page 2M [ 0.000000] init_memory_mapping: [mem 0x00100000-0xcffaffff] [ 0.000000] [mem 0x00100000-0x001fffff] page 4k [ 0.000000] [mem 0x00200000-0x3fffffff] page 2M [ 0.000000] [mem 0x40000000-0xbfffffff] page 1G [ 0.000000] [mem 0xc0000000-0xcfdfffff] page 2M [ 0.000000] [mem 0xcfe00000-0xcffaffff] page 4k [ 0.000000] init_memory_mapping: [mem 0x100000000-0x1ffffffff] [ 0.000000] [mem 0x100000000-0x1ffffffff] page 1G [ 0.000000] RAMDISK: [mem 0x35f72000-0x36fb0fff] [ 0.000000] ACPI: Early table checksum verification disabled [ 0.000000] ACPI: RSDP 0x00000000000FA820 000024 (v02 ACPIAM) [ 0.000000] ACPI: XSDT 0x00000000CFFB0100 00005C (v01 012711 OEMXSDT 20110127 MSFT 00000097) [ 0.000000] ACPI: FACP 0x00000000CFFB0290 0000F4 (v03 012711 OEMFACP 20110127 MSFT 00000097) [ 0.000000] ACPI BIOS Warning (bug): 32/64X length mismatch in FADT/Gpe0Block: 64/32 (20150619/tbfadt-623) [ 0.000000] ACPI: DSDT 0x00000000CFFB0450 0090C5 (v01 P0020 P0020000 00000000 INTL 20051117) [ 0.000000] ACPI: FACS 0x00000000CFFBE000 000040 [ 0.000000] ACPI: FACS 0x00000000CFFBE000 000040 [ 0.000000] ACPI: APIC 0x00000000CFFB0390 00007C (v01 012711 OEMAPIC 20110127 MSFT 00000097) [ 0.000000] ACPI: MCFG 0x00000000CFFB0410 00003C (v01 012711 OEMMCFG 20110127 MSFT 00000097) [ 0.000000] ACPI: OEMB 0x00000000CFFBE040 000071 (v01 012711 AMI_OEM 20110127 MSFT 00000097) [ 0.000000] ACPI: SRAT 0x00000000CFFB9520 0000E8 (v03 AMD FAM_F_10 00000002 AMD 00000001) [ 0.000000] ACPI: HPET 0x00000000CFFB9610 000038 (v01 012711 OEMHPET 20110127 MSFT 00000097) [ 0.000000] ACPI: SSDT 0x00000000CFFB9650 00088C (v01 A M I POWERNOW 00000001 AMD 00000001) [ 0.000000] ACPI: Local APIC address 0xfee00000 [ 0.000000] [ffffea0000000000-ffffea0008bfffff] PMD -> [ffff880227600000-ffff88022f5fffff] on node 0 [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff] [ 0.000000] DMA32 [mem 0x0000000001000000-0x00000000ffffffff] [ 0.000000] Normal [mem 0x0000000100000000-0x000000022fffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009efff] [ 0.000000] node 0: [mem 0x0000000000100000-0x00000000cffaffff] [ 0.000000] node 0: [mem 0x0000000100000000-0x000000022fffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000022fffffff] [ 0.000000] On node 0 totalpages: 2096974 [ 0.000000] DMA zone: 64 pages used for memmap [ 0.000000] DMA zone: 22 pages reserved [ 0.000000] DMA zone: 3998 pages, LIFO batch:0 [ 0.000000] DMA32 zone: 13247 pages used for memmap [ 0.000000] DMA32 zone: 847792 pages, LIFO batch:31 [ 0.000000] Normal zone: 19456 pages used for memmap [ 0.000000] Normal zone: 1245184 pages, LIFO batch:31 [ 0.000000] ACPI: PM-Timer IO Port: 0x808 [ 0.000000] ACPI: Local APIC address 0xfee00000 [ 0.000000] IOAPIC[0]: apic_id 4, version 33, address 0xfec00000, GSI 0-23 [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level) [ 0.000000] ACPI: IRQ0 used by override. [ 0.000000] ACPI: IRQ9 used by override. [ 0.000000] Using ACPI (MADT) for SMP configuration information [ 0.000000] ACPI: HPET id: 0x8300 base: 0xfed00000 [ 0.000000] smpboot: Allowing 6 CPUs, 2 hotplug CPUs [ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff] [ 0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff] [ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000e3fff] [ 0.000000] PM: Registered nosave memory: [mem 0x000e4000-0x000fffff] [ 0.000000] PM: Registered nosave memory: [mem 0xcffb0000-0xcffbdfff] [ 0.000000] PM: Registered nosave memory: [mem 0xcffbe000-0xcffdffff] [ 0.000000] PM: Registered nosave memory: [mem 0xcffe0000-0xcfffffff] [ 0.000000] PM: Registered nosave memory: [mem 0xd0000000-0xff6fffff] [ 0.000000] PM: Registered nosave memory: [mem 0xff700000-0xffffffff] [ 0.000000] e820: [mem 0xd0000000-0xff6fffff] available for PCI devices [ 0.000000] Booting paravirtualized kernel on bare hardware [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns [ 0.000000] setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:6 nr_node_ids:1 [ 0.000000] PERCPU: Embedded 31 pages/cpu @ffff88022fc00000 s88840 r8192 d29944 u262144 [ 0.000000] pcpu-alloc: s88840 r8192 d29944 u262144 alloc=1*2097152 [ 0.000000] pcpu-alloc: [0] 0 1 2 3 4 5 - - [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 2064185 [ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.2.0-rc1+ root=UUID=39706f53-7c27-4310-b22a-36c7b042d1a1 ro radeon.audio=1 [ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes) [ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) [ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) [ 0.000000] Memory: 8134376K/8387896K available (5820K kernel code, 810K rwdata, 2524K rodata, 928K init, 13772K bss, 253520K reserved, 0K cma-reserved) If I get any repeat lock-ups on the machine running the kernel in 64 bit mode I'll try to photograph them. Arthur. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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