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Subjectlockup when disabling CPUs
Hi

On a computer with 2 quad-core Barcelona Opterons, I experienced a lockup
in sync_page after disabling 7 cores in
/sys/devices/system/cpu/cpu$i/online . Reenabling the cores didn't resolve
it. The lockup resolved automatically after several minutes and the
machine continues to run.

The kernel is 2.6.34. I use ext2 filesystem on a SCSI disk on Fusion MPT
SCSI controller (there is also md-raid0 loaded, but it wasn't mounted at
the time of the lockup).

Mikulas

CPU 1 is now offline
CPU 2 is now offline
CPU 3 is now offline
CPU 4 is now offline
CPU 5 is now offline
CPU 6 is now offline
CPU 7 is now offline
SMP alternatives: switching to UP code
SysRq : Show Blocked State
task PC stack pid father
flush-8:0 D 0000000000000000 0 3492 2 0x00000000
ffff88023f0d78a0 0000000000000046 ffff88023f0d6000 ffff88023f0d7fd8
ffff88023f0d6000 ffff88023f0d7fd8 ffff88023f0d6000 ffff88023f0d7fd8
ffff88023f0d6000 ffff88023e67a050 0000000000012dc0 ffff88023f0d7fd8
Call Trace:
[<ffffffff81173f61>] ? cfq_may_queue+0x51/0xe0
[<ffffffff812e74fd>] ? io_schedule+0x4d/0x70
[<ffffffff81166b62>] ? get_request_wait+0x132/0x1d0
[<ffffffff8105eca0>] ? autoremove_wake_function+0x0/0x30
[<ffffffff81166c94>] ? __make_request+0x94/0x4d0
[<ffffffff81164c31>] ? generic_make_request+0x351/0x4b0
[<ffffffff810a4a12>] ? mempool_alloc+0x62/0x140
[<ffffffff81164de0>] ? submit_bio+0x50/0xc0
[<ffffffff8110dff9>] ? submit_bh+0x109/0x150
[<ffffffff8110fd9f>] ? __block_write_full_page+0x1cf/0x390
[<ffffffff810a4094>] ? find_get_pages_tag+0x54/0x160
[<ffffffff81110310>] ? end_buffer_async_write+0x0/0x200
[<ffffffff81114220>] ? blkdev_get_block+0x0/0x70
[<ffffffff810aa35a>] ? __writepage+0xa/0x40
[<ffffffff810aa879>] ? write_cache_pages+0x1a9/0x370
[<ffffffff810aa350>] ? __writepage+0x0/0x40
[<ffffffff81107b57>] ? writeback_single_inode+0xf7/0x380
[<ffffffff81108968>] ? writeback_inodes_wb+0x3b8/0x600
[<ffffffff81108cd6>] ? wb_writeback+0x126/0x200
[<ffffffff81109061>] ? wb_do_writeback+0x1e1/0x1f0
[<ffffffff811090d2>] ? bdi_writeback_task+0x62/0xa0
[<ffffffff810ba9c0>] ? bdi_start_fn+0x0/0xf0
[<ffffffff810baa3e>] ? bdi_start_fn+0x7e/0xf0
[<ffffffff810ba9c0>] ? bdi_start_fn+0x0/0xf0
[<ffffffff8105e716>] ? kthread+0x96/0xb0
[<ffffffff810032d4>] ? kernel_thread_helper+0x4/0x10
[<ffffffff8105e680>] ? kthread+0x0/0xb0
[<ffffffff810032d0>] ? kernel_thread_helper+0x0/0x10
aptitude D 0000000000000000 0 3497 3493 0x00000000
ffff88023f163d08 0000000000000082 ffff88023f162000 ffff88023f163fd8
ffff88023f162000 ffff88023f163fd8 ffff88023f162000 ffff88023f163fd8
ffff88023f162000 ffff88023f28e050 0000000000012dc0 ffff88023f163fd8
Call Trace:
[<ffffffff810a2340>] ? sync_page+0x0/0x70
[<ffffffff812e74fd>] ? io_schedule+0x4d/0x70
[<ffffffff810a2375>] ? sync_page+0x35/0x70
[<ffffffff812e7bb0>] ? __wait_on_bit+0x50/0x80
[<ffffffff810a251c>] ? wait_on_page_bit+0x6c/0x80
[<ffffffff8105ecd0>] ? wake_bit_function+0x0/0x30
[<ffffffff810ac5da>] ? pagevec_lookup_tag+0x1a/0x30
[<ffffffff810a2813>] ? filemap_fdatawait_range+0xd3/0x150
[<ffffffff810a2977>] ? filemap_write_and_wait_range+0x67/0x70
[<ffffffff8110c8cb>] ? vfs_fsync_range+0x8b/0xe0
[<ffffffff810c7d6e>] ? sys_msync+0x16e/0x1f0
[<ffffffff810025ab>] ? system_call_fastpath+0x16/0x1b

Module Size Used by
powernow_k8 11650 1
cpufreq_userspace 1992 0
cpufreq_stats 3881 0
cpufreq_powersave 902 0
cpufreq_ondemand 8021 0
freq_table 2427 3 powernow_k8,cpufreq_stats,cpufreq_ondemand
cpufreq_conservative 9196 0
raid0 6141 2
md_mod 90752 1 raid0
lm85 20425 0
hwmon_vid 2628 1 lm85
ide_cd_mod 26768 0
cdrom 34286 1 ide_cd_mod
ehci_hcd 36915 0
ohci_hcd 21868 0
serverworks 4132 0
i2c_piix4 8520 0
sata_svw 4430 0
k10temp 2795 0
hwmon 1385 2 lm85,k10temp
ide_core 88296 2 ide_cd_mod,serverworks
i2c_core 17422 2 lm85,i2c_piix4
libata 154751 1 sata_svw
rtc_cmos 8766 0
rtc_core 13548 1 rtc_cmos
usbcore 138235 3 ehci_hcd,ohci_hcd
floppy 55194 0
nls_base 6777 1 usbcore
rtc_lib 1881 1 rtc_core
thermal 11930 0
button 4778 0
processor 28143 1 powernow_k8
unix 23684 30



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