ok, bad news - the bootcrash has come back - see the crashlog attached below. Config attached as well. I reproduced this on upstream 16c29dafcc86 - i.e. all the latest Slab fixes applied. Thanks, Ingo -------------------> Linux version 2.6.38-08569-g16c29da (mingo@sirius) (gcc version 4.6.0 20110304 (Red Hat 4.6.0-0.12) (GCC) ) #110593 Sat Mar 26 13:46:21 CET 2011 Command line: root=/dev/sda6 earlyprintk=ttyS0,115200 console=ttyS0,115200 debug initcall_debug sysrq_always_enabled ignore_loglevel selinux=0 nmi_watchdog=1 panic=1 3 KERNEL supported cpus: Intel GenuineIntel AMD AuthenticAMD Centaur CentaurHauls BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009f800 (usable) BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000003fff0000 (usable) BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS) BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved) bootconsole [earlyser0] enabled debug: ignoring loglevel setting. NX (Execute Disable) protection: active DMI 2.3 present. DMI: System manufacturer System Product Name/A8N-E, BIOS ASUS A8N-E ACPI BIOS Revision 1008 08/22/2005 e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved) e820 remove range: 00000000000a0000 - 0000000000100000 (usable) last_pfn = 0x3fff0 max_arch_pfn = 0x400000000 MTRR default type: uncachable MTRR fixed ranges enabled: 00000-9FFFF write-back A0000-BFFFF uncachable C0000-C7FFF write-protect C8000-FFFFF uncachable MTRR variable ranges enabled: 0 base 0000000000 mask FFC0000000 write-back 1 disabled 2 disabled 3 disabled 4 disabled 5 disabled 6 disabled 7 disabled x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106 found SMP MP-table at [ffff8800000f5680] f5680 initial memory mapped : 0 - 20000000 Base memory trampoline at [ffff88000009d000] 9d000 size 8192 init_memory_mapping: 0000000000000000-000000003fff0000 0000000000 - 003fe00000 page 2M 003fe00000 - 003fff0000 page 4k kernel direct mapping tables up to 3fff0000 @ 3ffed000-3fff0000 [ffffea0000000000-ffffea0000dfffff] PMD -> [ffff88003e600000-ffff88003f3fffff] on node 0 Zone PFN ranges: DMA 0x00000010 -> 0x00001000 DMA32 0x00001000 -> 0x00100000 Normal empty Movable zone start PFN for each node early_node_map[2] active PFN ranges 0: 0x00000010 -> 0x0000009f 0: 0x00000100 -> 0x0003fff0 On node 0 totalpages: 262015 DMA zone: 56 pages used for memmap DMA zone: 2 pages reserved DMA zone: 3925 pages, LIFO batch:0 DMA32 zone: 3528 pages used for memmap DMA32 zone: 254504 pages, LIFO batch:31 SFI: Simple Firmware Interface v0.81 http://simplefirmware.org Intel MultiProcessor Specification v1.4 MPTABLE: OEM ID: OEM00000 MPTABLE: Product ID: PROD00000000 MPTABLE: APIC at: 0xFEE00000 Processor #0 (Bootup-CPU) Processor #1 ACPI: NR_CPUS/possible_cpus limit of 1 reached. Processor 1/0x1 ignored. IOAPIC[0]: apic_id 2, version 17, address 0xfec00000, GSI 0-23 Processors: 1 nr_irqs_gsi: 40 Allocating PCI resources starting at 40000000 (gap: 40000000:a0000000) Booting paravirtualized kernel on bare hardware pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 pcpu-alloc: [0] 0 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 258429 Kernel command line: root=/dev/sda6 earlyprintk=ttyS0,115200 console=ttyS0,115200 debug initcall_debug sysrq_always_enabled ignore_loglevel selinux=0 nmi_watchdog=1 panic=1 3 sysrq: sysrq always enabled. PID hash table entries: 4096 (order: 3, 32768 bytes) Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes) Inode-cache hash table entries: 65536 (order: 7, 524288 bytes) Memory: 1011352k/1048512k available (11595k kernel code, 452k absent, 36708k reserved, 6343k data, 1024k init) BUG: unable to handle kernel paging request at ffff87ffc1fdd020 IP: [] this_cpu_cmpxchg16b_emu+0x2/0x1c PGD 0 Oops: 0000 [#1] last sysfs file: CPU 0 Pid: 0, comm: swapper Not tainted 2.6.38-08569-g16c29da #110593 System manufacturer System Product Name/A8N-E RIP: 0010:[] [] this_cpu_cmpxchg16b_emu+0x2/0x1c RSP: 0000:ffffffff82003e78 EFLAGS: 00010086 RAX: ffff88003f8020c0 RBX: ffff88003f802180 RCX: 0000000000000002 RDX: 0000000000000001 RSI: ffff88003ffc2020 RDI: ffffffff8219be43 RBP: ffffffff82003ed8 R08: 0000000000000000 R09: ffffea0000de40d0 R10: ffffffff821666b0 R11: ffffffff821666b0 R12: ffff88003f8020c0 R13: ffff88003f802000 R14: ffffffffffffffff R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffffffff8201b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff87ffc1fdd020 CR3: 000000000200b000 CR4: 00000000000006b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 0, threadinfo ffffffff82002000, task ffffffff82015300) Stack: 0000000000000086 ffffffff810dcd03 ffffffffffffffff 0000000000093e30 ffffffff82003ef8 0000000000000000 00000000000000c0 0000000000000000 ffff88003f800000 ffff88003f8000c0 ffffffffffffffff 0000000000093e30 Call Trace: [] ? kmem_cache_alloc+0x53/0x130 [] kmem_cache_init+0xeb/0x2b0 [] start_kernel+0x1cb/0x322 [] x86_64_start_reservations+0xfe/0x102 [] ? early_idt_handlers+0x140/0x140 [] x86_64_start_kernel+0xcd/0xdc Code: 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 9c fa 48 3b 06 75 14 65 48 3b 56 08 75 0d 65 48 89 1e 65 48 89 4e RIP [] this_cpu_cmpxchg16b_emu+0x2/0x1c RSP CR2: ffff87ffc1fdd020 ---[ end trace a7919e7f17c0a725 ]--- Kernel panic - not syncing: Attempted to kill the idle task! Pid: 0, comm: swapper Tainted: G D 2.6.38-08569-g16c29da #110593 Call Trace: [] panic+0x91/0x18c [] do_exit+0x323/0x340 [] oops_end+0x96/0xe0 [] no_context+0x141/0x14e [] __bad_area_nosemaphore+0x18b/0x1ae [] bad_area_nosemaphore+0x13/0x15 [] do_page_fault+0x2a1/0x4b0 [] ? get_page_from_freelist+0x1a3/0x3d0 [] ? pcpu_chunk_slot+0x9/0x50 [] page_fault+0x25/0x30 [] ? kmem_cache_init+0xeb/0x2b0 [] ? this_cpu_cmpxchg16b_emu+0x2/0x1c [] ? kmem_cache_alloc+0x53/0x130 [] kmem_cache_init+0xeb/0x2b0 [] start_kernel+0x1cb/0x322 [] x86_64_start_reservations+0xfe/0x102 [] ? early_idt_handlers+0x140/0x140 [] x86_64_start_kernel+0xcd/0xdc Rebooting in 1 seconds..