Messages in this thread | | | Date | Mon, 7 Jun 2010 09:04:41 -0400 (EDT) | From | Mikulas Patocka <> | Subject | lockup 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
| |