While executing CPU HotPlug[1] tests i observed that during every cpu offline process an exception is thrown.
cpu 0x2: Vector: 700 (Program Check) at [c0000000074c7ca0] pc: 00000000007b6640 lr: 000000000079ddc0 sp: c0000000074c7f20 msr: 8000000000081002 current = 0xc0000000fe1c8580 paca = 0xc000000000ab2800 pid = 0, comm = swapper 2:mon> r R00 = 0000000000000000 R16 = 0000000000000002 R01 = c0000000074c7f20 R17 = 0000000000000000 R02 = 00000000009e8dc0 R18 = 0000000000000000 R03 = 0000000000008278 R19 = 0000000000000000 R04 = 0000000000008000 R20 = 0000000000000000 R05 = 0000000000000002 R21 = 0000000000000000 R06 = 0000000000000002 R22 = c000000000b33ae0 R07 = 0000000000000000 R23 = 0000000000000000 R08 = 0000000000000000 R24 = 0000000000000002 R09 = 00000000000082fc R25 = 0000000000000000 R10 = 0000000000000000 R26 = 0000000000000004 R11 = a000000000001002 R27 = c000000000a95bd8 R12 = a000000000000000 R28 = 0000000000000008 R13 = c000000000ab2800 R29 = ffffffffffffffff R14 = 0000000000000000 R30 = c00000000095e750 R15 = 0000000007531868 R31 = 0000000007d70b20 pc = 00000000007b6640 lr = 000000000079ddc0 msr = 8000000000081002 cr = 22000004 ctr = 0000000000000000 xer = 0000000000000020 trap = 700 2:mon> u SLB contents of cpu 2 00 c000000008000000 40004f7ca3000500 1T ESID= c00000 VSID= 4f7ca3 LLP:100 01 d000000008000000 4000eb71b0000510 1T ESID= d00000 VSID= eb71b0 LLP:110 24 0000000008000000 0000000000000c80 256M ESID= 0 VSID= 0 LLP: 0 2:mon> I can recreate this problem very easily on power5 as well as power6 box. 2.6.29-git6 did not have this problem. Let me know if there is any other information i can provide. I have attached the dmesg log here. Thanks -Sachin [1] -> CPU Hotplug test which is part of LTP. -- --------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India ---------------------------------
<6>Phyp-dump disabled at boot time. <6>Using pSeries machine description. <7>Page orders: linear mapping = 24, virtual = 16, io = 12. <6>Using 1TB segments. <4>Found initrd at 0xc0000000034d0000:0xc000000003c7f14f. <6>console [udbg0] enabled. <6>Partition configured for 4 cpus.. <6>CPU maps initialized for 2 threads per core. <7> (thread shift is 1). <4>Starting Linux PPC64 #3 SMP Tue Mar 31 14:33:34 IST 2009. <4>-----------------------------------------------------. <4>ppc64_pft_size = 0x1a. <4>physicalMemorySize = 0x100000000. <4>htab_hash_mask = 0x7ffff. <4>-----------------------------------------------------. <6>Initializing cgroup subsys cpuset. <6>Initializing cgroup subsys cpu. <5>Linux version 2.6.29-git7 (r...@llm62) (gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux) ) #3 SMP Tue Mar 31 14:33:34 IST 2009. <4>[boot]0012 Setup Arch. <7>Node 0 Memory: 0x0-0x100000000. <4>EEH: No capable adapters found. <6>PPC64 nvram contains 15360 bytes. <7>Using shared processor idle loop. <4>Zone PFN ranges:. <4> DMA 0x00000000 -> 0x00010000. <4> Normal 0x00010000 -> 0x00010000. <4>Movable zone start PFN for each node. <4>early_node_map[1] active PFN ranges. <4> 0: 0x00000000 -> 0x00010000. <7>On node 0 totalpages: 65536. <7> DMA zone: 56 pages used for memmap. <7> DMA zone: 0 pages reserved. <7> DMA zone: 65480 pages, LIFO batch:1. <4>[boot]0015 Setup Done. <4>Built 1 zonelists in Node order, mobility grouping on. Total pages: 65480. <4>Policy zone: DMA. <5>Kernel command line: root=/dev/sda5 sysrq=1 insmod=sym53c8xx insmod=ipr crashkernel=512M-:256M . <6>NR_IRQS:512. <4>[boot]0020 XICS Init. <4>[boot]0021 XICS Done. <7>pic: no ISA interrupt controller. <4>PID hash table entries: 4096 (order: 12, 32768 bytes). <7>time_init: decrementer frequency = 512.000000 MHz. <7>time_init: processor frequency = 4704.000000 MHz. <6>clocksource: timebase mult[7d0000] shift[22] registered. <7>clockevent: decrementer mult[8312] shift[16] cpu[0]. <4>Console: colour dummy device 80x25. <6>console handover: boot [udbg0] -> real [hvc0]. <6>Dentry cache hash table entries: 524288 (order: 6, 4194304 bytes). <6>Inode-cache hash table entries: 262144 (order: 5, 2097152 bytes). <6>allocated 2621440 bytes of page_cgroup. <6>please try cgroup_disable=memory option if you don't want. <4>freeing bootmem node 0. <6>Memory: 4119872k/4194304k available (8192k kernel code, 74432k reserved, 1984k data, 4194k bss, 448k init). <6>Calibrating delay loop... 1022.36 BogoMIPS (lpj=5111808). <6>Security Framework initialized. <6>SELinux: Disabled at boot.. <4>Mount-cache hash table entries: 4096. <6>Initializing cgroup subsys debug. <6>Initializing cgroup subsys ns. <6>Initializing cgroup subsys cpuacct. <6>Initializing cgroup subsys memory. <6>Initializing cgroup subsys devices. <6>Initializing cgroup subsys freezer. <7>clockevent: decrementer mult[8312] shift[16] cpu[1]. <4>Processor 1 found.. <7>clockevent: decrementer mult[8312] shift[16] cpu[2]. <4>Processor 2 found.. <7>clockevent: decrementer mult[8312] shift[16] cpu[3]. <4>Processor 3 found.. <6>Brought up 4 CPUs. <7>Node 0 CPUs: 0-3. <7>CPU0 attaching sched-domain:. <7> domain 0: span 0-1 level SIBLING. <7> groups: 0 1. <7> domain 1: span 0-3 level CPU. <7> groups: 0-1 2-3. <7> domain 2: span 0-3 level NODE. <7> groups: 0-3. <7>CPU1 attaching sched-domain:. <7> domain 0: span 0-1 level SIBLING. <7> groups: 1 0. <7> domain 1: span 0-3 level CPU. <7> groups: 0-1 2-3. <7> domain 2: span 0-3 level NODE. <7> groups: 0-3. <7>CPU2 attaching sched-domain:. <7> domain 0: span 2-3 level SIBLING. <7> groups: 2 3. <7> domain 1: span 0-3 level CPU. <7> groups: 2-3 0-1. <7> domain 2: span 0-3 level NODE. <7> groups: 0-3. <7>CPU3 attaching sched-domain:. <7> domain 0: span 2-3 level SIBLING. <7> groups: 3 2. <7> domain 1: span 0-3 level CPU. <7> groups: 2-3 0-1. <7> domain 2: span 0-3 level NODE. <7> groups: 0-3. <6>net_namespace: 1888 bytes. <6>NET: Registered protocol family 16. <6>IBM eBus Device Driver. <6>PCI: Probing PCI hardware. <7>PCI: Probing PCI hardware done. <4>bio: create slab <bio-0> at 0. <6>usbcore: registered new interface driver usbfs. <6>usbcore: registered new interface driver hub. <6>usbcore: registered new device driver usb. <6>NET: Registered protocol family 2. <7>Switched to high resolution mode on CPU 0. <7>Switched to high resolution mode on CPU 1. <7>Switched to high resolution mode on CPU 2. <7>Switched to high resolution mode on CPU 3. <6>IP route cache hash table entries: 32768 (order: 2, 262144 bytes). <6>TCP established hash table entries: 131072 (order: 5, 2097152 bytes). <6>TCP bind hash table entries: 65536 (order: 4, 1048576 bytes). <6>TCP: Hash tables configured (established 131072 bind 65536). <6>TCP reno registered. <6>NET: Registered protocol family 1. <6>Unpacking initramfs... done. <4>Freeing initrd memory: 7868k freed. <6>IOMMU table initialized, virtual merging enabled. <7>RTAS daemon started. <6>audit: initializing netlink socket (disabled). <5>type=2000 audit(1238490478.637:1): initialized. <6>Kprobe smoke test started. <6>Kprobe smoke test passed successfully. <6>HugeTLB registered 16 MB page size, pre-allocated 0 pages. <6>HugeTLB registered 16 GB page size, pre-allocated 0 pages. <5>VFS: Disk quotas dquot_6.5.2. <4>Dquot-cache hash table entries: 8192 (order 0, 65536 bytes). <6>msgmni has been set to 8060. <6>alg: No test for stdrng (krng). <6>Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254). <6>io scheduler noop registered. <6>io scheduler anticipatory registered. <6>io scheduler deadline registered. <6>io scheduler cfq registered (default). <6>pci_hotplug: PCI Hot Plug PCI Core version: 0.5. <6>rpaphp: RPA HOT Plug PCI Controller Driver version: 0.1. <7>vio_register_driver: driver hvc_console registering. <7>HVSI: registered 0 devices. <6>Generic RTC Driver v1.07. <6>Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled. <6>pmac_zilog: 0.6 (Benjamin Herrenschmidt <b...@kernel.crashing.org>). <6>input: Macintosh mouse button emulation as /devices/virtual/input/input0. <6>Uniform Multi-Platform E-IDE driver. <6>ide-gd driver 1.18. <6>IBM eHEA ethernet device driver (Release EHEA_0100). <6>ehea: eth0: Jumbo frames are disabled. <6>ehea: eth0 -> logical port id #2. <6>ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver. <6>ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver. <6>mice: PS/2 mouse device common for all mice. <6>EDAC MC: Ver: 2.1.0 Mar 31 2009. <6>usbcore: registered new interface driver hiddev. <6>usbcore: registered new interface driver usbhid. <6>usbhid: v2.6:USB HID core driver. <6>TCP cubic registered. <6>NET: Registered protocol family 15. <4>registered taskstats version 1. <4>Freeing unused kernel memory: 448k freed. <6>SysRq : Changing Loglevel. <4>Loglevel set to 1. <5>SCSI subsystem initialized. <7>vio_register_driver: driver ibmvscsi registering. <6>ibmvscsi 30000002: SRP_VERSION: 16.a. <6>scsi0 : IBM POWER Virtual SCSI Adapter 1.5.8. <6>ibmvscsi 30000002: partner initialization complete. <6>ibmvscsi 30000002: sent SRP login. <6>ibmvscsi 30000002: SRP_LOGIN succeeded. <6>ibmvscsi 30000002: host srp version: 16.a, host partition VIO (1), OS 3, max io 1048576. <5>scsi 0:0:1:0: Direct-Access AIX VDASD 0001 PQ: 0 ANSI: 3. <6>udevd version 128 started. <4>Driver 'sd' needs updating - please use bus_type methods. <5>sd 0:0:1:0: [sda] 167772160 512-byte hardware sectors: (85.8 GB/80.0 GiB). <5>sd 0:0:1:0: [sda] Write Protect is off. <7>sd 0:0:1:0: [sda] Mode Sense: 17 00 00 08. <5>sd 0:0:1:0: [sda] Cache data unavailable. <3>sd 0:0:1:0: [sda] Assuming drive cache: write through. <5>sd 0:0:1:0: [sda] Cache data unavailable. <3>sd 0:0:1:0: [sda] Assuming drive cache: write through. <6> sda: sda1 sda2 < sda5 > sda3 sda4. <5>sd 0:0:1:0: [sda] Attached SCSI disk. <6>kjournald starting. Commit interval 5 seconds. <6>EXT3 FS on sda5, internal journal. <6>EXT3-fs: mounted filesystem with ordered data mode.. <6>udevd version 128 started. <5>sd 0:0:1:0: Attached scsi generic sg0 type 0. <6>Adding 1044096k swap on /dev/sda3. Priority:-1 extents:1 across:1044096k . <6>device-mapper: uevent: version 1.0.3. <6>device-mapper: ioctl: 4.14.0-ioctl (2008-04-23) initialised: dm-de...@redhat.com. <6>loop: module loaded. <6>fuse init (API version 7.11). <6>ehea: eth0: Physical port up. <6>ehea: External switch port is backup port. <6>NET: Registered protocol family 10. <6>lo: Disabled Privacy Extensions. <7>eth0: no IPv6 routers present. <4>cpu 2 (hwid 2) Ready to die.... <7>CPU0 attaching NULL sched-domain.. <7>CPU1 attaching NULL sched-domain.. <7>CPU2 attaching NULL sched-domain.. <7>CPU3 attaching NULL sched-domain.. <7>CPU0 attaching sched-domain:. <7> domain 0: span 0-1 level SIBLING. <7> groups: 0 1. <7> domain 1: span 0-1,3 level CPU. <7> groups: 0-1 3. <7> domain 2: span 0-1,3 level NODE. <7> groups: 0-1,3. <7>CPU1 attaching sched-domain:. <7> domain 0: span 0-1 level SIBLING. <7> groups: 1 0. <7> domain 1: span 0-1,3 level CPU. <7> groups: 0-1 3. <7> domain 2: span 0-1,3 level NODE. <7> groups: 0-1,3. <7>CPU3 attaching sched-domain:. <7> domain 0: span 0-1,3 level CPU. <7> groups: 3 0-1. <7> domain 1: span 0-1,3 level NODE. <7> groups: 0-1,3.....................
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