On Friday, 13 of June 2008, Alexey Fisher wrote:
> I found that SLAB breaking supsned and cpu-hotplug on my PC. I didn't
> get to bisect it, so i think it is just the part of SLAB. At the moment
> i converted my kernel to SLUB and it working just fine, about 10
> suspends and no reboot or crush ... it ist a record for my PC.
>
> Easy way to reproduce is to compile SLAB kernel and
> echo 0 > /sys/devices/system/cpu/cpu1/online
> echo 1 > /sys/devices/system/cpu/cpu1/online
>
> other work around to make my PC working stable are kernel options: nosmp
> or mem=1024M
> kernel 2.6.26-rc6-00028-gc6d8f40 #68 SMP PREEMPT
Is this a regression from 2.6.25?
> dmesg will return:
> [ 119.362281] CPU0 attaching NULL sched-domain.
> [ 119.362281] CPU1 attaching NULL sched-domain.
> [ 119.365524] kvm: disabling virtualization on CPU1
> [ 119.365524] Breaking affinity for irq 1
> [ 119.365524] Breaking affinity for irq 18
> [ 119.468547] CPU 1 is now offline
> [ 119.468553] lockdep: fixing up alternatives.
> [ 119.468561] SMP alternatives: switching to UP code
> [ 119.468568] BUG: sleeping function called from invalid context at
> mm/slab.c:3052
> [ 119.468574] in_atomic():1, irqs_disabled():0
> [ 119.468578] 4 locks held by bash/5128:
> [ 119.468581] #0: (&buffer->mutex){--..}, at: [<c01ac68e>]
> sysfs_write_file+0x25/0xe3
> [ 119.468598] #1: (cpu_add_remove_lock){--..}, at: [<c014242b>]
> cpu_maps_update_begin+0xf/0x11
> [ 119.468611] #2: (&cpu_hotplug.lock){--..}, at: [<c014246f>]
> cpu_hotplug_begin+0x1a/0x42
> [ 119.468623] #3: (smp_alt){--..}, at: [<c0106f7c>]
> alternatives_smp_switch+0x14c/0x165
> [ 119.468638] Pid: 5128, comm: bash Not tainted
> 2.6.26-rc6-testing-00028-gc6d8f40 #67
> [ 119.468645] [<c011a235>] __might_sleep+0xe7/0xee
> [ 119.468655] [<c017262d>] kmem_cache_alloc+0x27/0xd2
> [ 119.468664] [<c016a498>] ? __get_vm_area_node+0x86/0x186
> [ 119.468674] [<c016a498>] __get_vm_area_node+0x86/0x186
> [ 119.468684] [<c016a618>] get_vm_area_caller+0x3e/0x43
> [ 119.468692] [<c0358b61>] ? text_poke+0x9e/0x11e
> [ 119.468702] [<c016aa53>] vmap+0x21/0x44
> [ 119.468710] [<c0358b61>] text_poke+0x9e/0x11e
> [ 119.468717] [<c0101433>] ? sys_execve+0x37/0x4d
> [ 119.468727] [<c0106d53>] alternatives_smp_unlock+0x41/0x50
> [ 119.468736] [<c0106f48>] alternatives_smp_switch+0x118/0x165
> [ 119.468813] [<c035b9f1>] ? _etext+0x0/0xf
> [ 119.468822] [<c0121ce5>] ? printk+0x15/0x17
> [ 119.468833] [<c010e222>] __cpu_die+0x42/0x69
> [ 119.468842] [<c034809f>] _cpu_down+0x148/0x1f8
> [ 119.468854] [<c0348172>] cpu_down+0x23/0x30
> [ 119.468863] [<c034927b>] store_online+0x27/0x5a
> [ 119.468870] [<c0349254>] ? store_online+0x0/0x5a
> [ 119.468880] [<c0271f10>] sysdev_store+0x20/0x25
> [ 119.468889] [<c01ac721>] sysfs_write_file+0xb8/0xe3
> [ 119.468899] [<c01ac669>] ? sysfs_write_file+0x0/0xe3
> [ 119.468907] [<c01757b2>] vfs_write+0x8c/0x108
> [ 119.468916] [<c0175d0c>] sys_write+0x3b/0x60
> [ 119.468924] [<c0102d4d>] sysenter_past_esp+0x6a/0xb1
> [ 119.468934] =======================
> [ 119.625144] CPU0 attaching NULL sched-domain.
>
>
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>
--
Rafael J. Wysocki, Ph.D.
Institute of Theoretical Physics
Faculty of Physics of Warsaw University
ul. Hoza 69, 00-681 Warsaw
[tel: +48 22 55 32 263]
[mob: +48 60 50 53 693]
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