David Gibson wrote:
so, could you try booting the kernel with the patch below, which should give a bit more information about the problem.Index: working-2.6/mm/mmap.c =================================================================== --- working-2.6.orig/mm/mmap.c 2009-11-13 13:08:29.000000000 +1100 +++ working-2.6/mm/mmap.c 2009-11-13 13:09:26.000000000 +1100 @@ -2136,6 +2136,8 @@ void exit_mmap(struct mm_struct *mm) while (vma) vma = remove_vma(vma); + if (nr_ptes != 0) + printk("exit_mmap(): mm %p nr_ptes %d\n", mm, mm->nr_ptes); BUG_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT); }
Here is the information collected with today's next. (2.6.32-rc7-20091113) ------------[ cut here ]------------ kernel BUG at mm/mmap.c:2139! cpu 0x3: Vector: 700 (Program Check) at [c0000000fae1b7e0] pc: c000000000150e88: .exit_mmap+0x1ac/0x1d4 lr: c000000000150e78: .exit_mmap+0x19c/0x1d4 sp: c0000000fae1ba60 msr: 8000000000029032 current = 0xc0000000fada8be0 paca = 0xc000000000bb2c00 pid = 84, comm = cat kernel BUG at mm/mmap.c:2139! enter ? for help [c0000000fae1bb10] c000000000093d24 .mmput+0x54/0x164 [c0000000fae1bba0] c000000000098f30 .exit_mm+0x17c/0x1a0 [c0000000fae1bc50] c00000000009b310 .do_exit+0x248/0x784 [c0000000fae1bd30] c00000000009b900 .do_group_exit+0xb4/0xe8 [c0000000fae1bdc0] c00000000009b948 .SyS_exit_group+0x14/0x28 [c0000000fae1be30] c0000000000085b4 syscall_exit+0x0/0x40 --- Exception: c01 (System Call) at 00000fff89a8ff40 SP (fffdf8a2460) is in userspace Have attached the complete boot log. At the time of crash values of mm and mm->nr_ptes were <7>exit_mmap(): mm c0000000fa9f9580 nr_ptes 1 Thanks -Sachin -- --------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India ---------------------------------
<4>Crash kernel location must be 0x2000000 <6>Reserving 256MB of memory at 32MB for crashkernel (System RAM: 4096MB) <6>Using pSeries machine description <7>Page orders: linear mapping = 24, virtual = 16, io = 12 <6>Using 1TB segments <4>Found initrd at 0xc0000000034d0000:0xc000000003cf8359 <6>bootconsole [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 Fri Nov 13 14:48:28 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 2.6.32-rc7-next-20091113 (r...@llm62) (gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux) ) #3 SMP Fri Nov 13 14:48:28 IST 2009 <4>[boot]0012 Setup Arch <7>Node 0 Memory: <7>Node 1 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> 1: 0x00000000 -> 0x00010000 <4>Could not find start_pfn for node 0 <7>On node 0 totalpages: 0 <7>On node 1 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 <6>PERCPU: Embedded 2 pages/cpu @c000000000f00000 s89000 r0 d42072 u262144 <6>pcpu-alloc: s89000 r0 d42072 u262144 alloc=1*1048576 <6>pcpu-alloc: [0] 0 1 2 3 <4>Built 2 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 xmon=on <6>PID hash table entries: 4096 (order: -1, 32768 bytes) <4>freeing bootmem node 1 <6>Memory: 3899712k/4194304k available (9216k kernel code, 294592k reserved, 2688k data, 2370k bss, 640k init) <6>Hierarchical RCU implementation. <6>RCU-based detection of stalled CPUs is enabled. <6>NR_IRQS:512 nr_irqs:512 <4>[boot]0020 XICS Init <4>[boot]0021 XICS Done <7>pic: no ISA interrupt controller <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[83126e97] shift[32] cpu[0] <4>Console: colour dummy device 80x25 <6>console [hvc0] enabled, bootconsole disabled <6>allocated 2621440 bytes of page_cgroup <6>please try 'cgroup_disable=memory' option if you don't want memory cgroups <6>Security Framework initialized <6>SELinux: Disabled at boot. <6>Dentry cache hash table entries: 524288 (order: 6, 4194304 bytes) <6>Inode-cache hash table entries: 262144 (order: 5, 2097152 bytes) <4>Mount-cache hash table entries: 4096 <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> alloc irq_desc for 16 on node 0 <7> alloc kstat_irqs on node 0 <7>irq: irq 2 on host null mapped to virtual irq 16 <7>clockevent: decrementer mult[83126e97] shift[32] cpu[1] <4>Processor 1 found. <7>clockevent: decrementer mult[83126e97] shift[32] cpu[2] <4>Processor 2 found. <7>clockevent: decrementer mult[83126e97] shift[32] cpu[3] <4>Processor 3 found. <6>Brought up 4 CPUs <7>Node 0 CPUs: 0-3 <7>Node 1 CPUs: <7>CPU0 attaching sched-domain: <7> domain 0: span 0-1 level SIBLING <7> groups: 0 (cpu_power = 589) 1 (cpu_power = 589) <7> domain 1: span 0-3 level CPU <7> groups: 0-1 (cpu_power = 1178) 2-3 (cpu_power = 1178) <7>CPU1 attaching sched-domain: <7> domain 0: span 0-1 level SIBLING <7> groups: 1 (cpu_power = 589) 0 (cpu_power = 589) <7> domain 1: span 0-3 level CPU <7> groups: 0-1 (cpu_power = 1178) 2-3 (cpu_power = 1178) <7>CPU2 attaching sched-domain: <7> domain 0: span 2-3 level SIBLING <7> groups: 2 (cpu_power = 589) 3 (cpu_power = 589) <7> domain 1: span 0-3 level CPU <7> groups: 2-3 (cpu_power = 1178) 0-1 (cpu_power = 1178) <7>CPU3 attaching sched-domain: <7> domain 0: span 2-3 level SIBLING <7> groups: 3 (cpu_power = 589) 2 (cpu_power = 589) <7> domain 1: span 0-3 level CPU <7> groups: 2-3 (cpu_power = 1178) 0-1 (cpu_power = 1178) <6>NET: Registered protocol family 16 <6>IBM eBus Device Driver <6>POWER6 performance monitor hardware support registered <6>PCI: Probing PCI hardware <7>PCI: Probing PCI hardware done <4>bio: create slab <bio-0> at 0 <6>vgaarb: loaded <6>usbcore: registered new interface driver usbfs <6>usbcore: registered new interface driver hub <6>usbcore: registered new device driver usb <6>Switching to clocksource timebase <6>NET: Registered protocol family 2 <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>UDP hash table entries: 2048 (order: 0, 65536 bytes) <6>UDP-Lite hash table entries: 2048 (order: 0, 65536 bytes) <6>NET: Registered protocol family 1 <7>PCI: CLS 0 bytes, default 128 <6>Unpacking initramfs... <7>RTAS daemon started <7> alloc irq_desc for 17 on node 0 <7> alloc kstat_irqs on node 0 <7>irq: irq 655360 on host null mapped to virtual irq 17 <7> alloc irq_desc for 18 on node 0 <7> alloc kstat_irqs on node 0 <7>irq: irq 655362 on host null mapped to virtual irq 18 <6>IOMMU table initialized, virtual merging enabled <7> alloc irq_desc for 19 on node 0 <7> alloc kstat_irqs on node 0 <7>irq: irq 589825 on host null mapped to virtual irq 19 <6>audit: initializing netlink socket (disabled) <5>type=2000 audit(1258104404.220:1): initialized <1>rcu-torture:--- Start of test: nreaders=8 nfakewriters=4 stat_interval=0 verbose=0 test_no_idle_hz=0 shuffle_interval=3 stutter=5 irqreader=1 <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 7616 <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 deadline registered <6>io scheduler cfq registered (default) <6>pci_hotplug: PCI Hot Plug PCI Core version: 0.5 <6>pciehp: PCI Express Hot Plug Controller Driver version: 0.4 <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>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 Nov 13 2009 <6>usbcore: registered new interface driver hiddev <6>usbcore: registered new interface driver usbhid <6>usbhid: USB HID core driver <6>TCP cubic registered <6>NET: Registered protocol family 15 <4>registered taskstats version 1 <4>Freeing unused kernel memory: 640k freed <7>exit_mmap(): mm c0000000fa9f9580 nr_ptes 1 <0>------------[ cut here ]------------ <2>kernel BUG at mm/mmap.c:2139! 3:mon>
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