Messages in this thread | | | Date | Fri, 23 Jan 2009 04:57:03 +0100 | From | Nick Piggin <> | Subject | Re: [patch] SLQB slab allocator |
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On Thu, Jan 22, 2009 at 04:45:33PM +0800, Zhang, Yanmin wrote: > On Wed, 2009-01-21 at 15:30 +0100, Nick Piggin wrote: > > Hi, > > > > Since last posted, I've cleaned up a few bits and pieces, (hopefully) > > fixed a known bug where it wouldn't boot on memoryless nodes (I don't > > have a system to test with), > Panic again on my Montvale Itanium NUMA machine if I start kernel with parameter > mem=2G. > > The call chain is mnt_init => sysfs_init. ???kmem_cache_create fails, so later on > when ???mnt_init uses kmem_cache sysfs_dir_cache, kernel panic > at __slab_alloc => get_cpu_slab because parameter s is equal to NULL. > > Function __remote_slab_alloc return NULL when s->node[node]==NULL. That causes > ???sysfs_init => kmem_cache_create fails.
Hmm, I'll probably have to add a bit more fallback logic. I'll have to work out what semantics the callers require here. Thanks for the report.
> > > ------------------log---------------- > > Dentry cache hash table entries: 262144 (order: 7, 2097152 bytes) > Inode-cache hash table entries: 131072 (order: 6, 1048576 bytes) > Mount-cache hash table entries: 1024 > mnt_init: sysfs_init error: -12 > Unable to handle kernel NULL pointer dereference (address 0000000000002058) > swapper[0]: Oops 8813272891392 [1] > Modules linked in: > > Pid: 0, CPU 0, comm: swapper > psr : 00001010084a2018 ifs : 8000000000000690 ip : [<a000000100180350>] Not tainted (2.6.29-rc2slqb0121) > ip is at kmem_cache_alloc+0x150/0x4e0 > unat: 0000000000000000 pfs : 0000000000000690 rsc : 0000000000000003 > rnat: 0009804c8a70433f bsps: a000000100f484b0 pr : 656960155aa65959 > ldrs: 0000000000000000 ccv : 000000000000001a fpsr: 0009804c8a70433f > csd : 893fffff000f0000 ssd : 893fffff00090000 > b0 : a000000100180270 b6 : a000000100507360 b7 : a000000100507360 > f6 : 000000000000000000000 f7 : 1003e0000000000000800 > f8 : 1003e0000000000000008 f9 : 1003e0000000000000001 > f10 : 1003e0000000000000031 f11 : 1003e7d6343eb1a1f58d1 > r1 : a0000001011bc810 r2 : 0000000000000008 r3 : ffffffffffffffff > r8 : 0000000000000000 r9 : a000000100ded800 r10 : 0000000000000000 > r11 : a000000100ded800 r12 : a000000100db3d80 r13 : a000000100dac000 > r14 : 0000000000000000 r15 : fffffffffffffffe r16 : a000000100fbcd30 > r17 : a000000100dacc44 r18 : 0000000000002058 r19 : 0000000000000000 > r20 : 0000000000000000 r21 : a000000100dacc44 r22 : 0000000000000002 > r23 : 0000000000000066 r24 : 0000000000000073 r25 : 0000000000000000 > r26 : e000000102014030 r27 : a0007fffffc9f120 r28 : 0000000000000000 > r29 : 0000000000000000 r30 : 0000000000000008 r31 : 0000000000000001 > > Call Trace: > [<a000000100016240>] show_stack+0x40/0xa0 > sp=a000000100db3950 bsp=a000000100dad140 > [<a000000100016b50>] show_regs+0x850/0x8a0 > sp=a000000100db3b20 bsp=a000000100dad0e8 > [<a00000010003a5f0>] die+0x230/0x360 > sp=a000000100db3b20 bsp=a000000100dad0a0 > [<a00000010005e0e0>] ia64_do_page_fault+0x8e0/0xa40 > sp=a000000100db3b20 bsp=a000000100dad050 > [<a00000010000c700>] ia64_native_leave_kernel+0x0/0x280 > sp=a000000100db3bb0 bsp=a000000100dad050 > [<a000000100180350>] kmem_cache_alloc+0x150/0x4e0 > sp=a000000100db3d80 bsp=a000000100dacfc8 > [<a000000100238610>] sysfs_new_dirent+0x90/0x240 > sp=a000000100db3d80 bsp=a000000100dacf80 > [<a000000100239140>] create_dir+0x40/0x100 > sp=a000000100db3d90 bsp=a000000100dacf48 > [<a0000001002392b0>] sysfs_create_dir+0xb0/0x100 > sp=a000000100db3db0 bsp=a000000100dacf28 > [<a0000001004eca60>] kobject_add_internal+0x1e0/0x420 > sp=a000000100db3dc0 bsp=a000000100dacee8 > [<a0000001004eceb0>] kobject_add_varg+0x90/0xc0 > sp=a000000100db3dc0 bsp=a000000100daceb0 > [<a0000001004ed620>] kobject_add+0x100/0x140 > sp=a000000100db3dc0 bsp=a000000100dace50 > [<a0000001004ed6b0>] kobject_create_and_add+0x50/0xc0 > sp=a000000100db3e00 bsp=a000000100dace20 > [<a000000100c28ff0>] mnt_init+0x1b0/0x480 > sp=a000000100db3e00 bsp=a000000100dacde0 > [<a000000100c28610>] vfs_caches_init+0x230/0x280 > sp=a000000100db3e20 bsp=a000000100dacdb8 > [<a000000100c01410>] start_kernel+0x830/0x8c0 > sp=a000000100db3e20 bsp=a000000100dacd40 > [<a0000001009d7b60>] __kprobes_text_end+0x760/0x780 > sp=a000000100db3e30 bsp=a000000100dacca0 > Kernel panic - not syncing: Attempted to kill the idle task! >
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