HI have a problem with 2.6.8 kernel (Suse 9.2 default) running on dual opteron machine, The machine goes into hard lock 3-4 times a day with the following message: ====================================================================== May 25 18:41:49 linux -- MARK -- May 25 18:45:46 linux kernel: Unable to handle kernel paging request at 00000000000018f0 RIP: May 25 18:45:46 linux kernel: {kmem_getpages+132} May 25 18:45:46 linux kernel: PML4 140787067 PGD 13f40e067 PMD 0 May 25 18:45:46 linux kernel: Oops: 0000 [1] SMP May 25 18:45:46 linux kernel: CPU 1 May 25 18:45:46 linux kernel: Modules linked in: usbserial floppy parport_pc lp parport edd freq_table thermal processor fan button battery ac ipv6 snd_pcm_oss snd_mixer_oss snd_ioctl32 snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd soundcore snd_page_alloc af_packet subfs joydev sg st sr_mod ehci_hcd uhci_hcd ohci1394 ieee1394 ohci_hcd hw_random evdev dm_mod usbcore e1000 reiserfs sata_sil libata sd_mod scsi_mod May 25 18:45:46 linux kernel: Pid: 7785, comm: a.out Not tainted (2.6.8-24.10-smp SL92_BRANCH-200412221154270000) May 25 18:45:46 linux kernel: RIP: 0010:[] {kmem_getpages+132} May 25 18:45:46 linux kernel: RSP: 0018:000001013f925ad8 EFLAGS: 00010213 May 25 18:45:46 linux kernel: RAX: ffffffff7fffffff RBX: 000001017ffca880 RCX: 0000000000000000 May 25 18:45:46 linux kernel: RDX: 000001000000f780 RSI: 000001000000fb00 RDI: 000001000000f000 May 25 18:45:46 linux kernel: RBP: 0000010037ffd000 R08: 0000010139c0e000 R09: 0000000000000010 May 25 18:45:46 linux kernel: R10: 0000000000000006 R11: 0000000000000002 R12: 000001017ffca880 May 25 18:45:46 linux kernel: R13: 000001017ffca8c8 R14: 0000000000000000 R15: 0000000000000000 May 25 18:45:46 linux kernel: FS: 0000002a9782c160(0000) GS:ffffffff804e2e80(005b) knlGS:00000000556f6080 May 25 18:45:46 linux kernel: CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 May 25 18:45:46 linux kernel: CR2: 00000000000018f0 CR3: 000000017ff98000 CR4: 00000000000006e0 May 25 18:45:46 linux kernel: Process a.out (pid: 7785, threadinfo 000001013f924000, task 000001017a2e3030) May 25 18:45:46 linux kernel: Stack: 000000d23a5c5f34 00000100054a22d8 0000000000000010 ffffffff80162a49 May 25 18:45:46 linux kernel: 000001017ffca928 0000000000000001 0000005000000050 0000000000000000 May 25 18:45:46 linux kernel: 0000000000000000 0000000000001000 May 25 18:45:46 linux kernel: Call Trace:{cache_alloc_refill+665} {kmem_cache_alloc+54} May 25 18:45:46 linux kernel: {alloc_buffer_head+17} {create_buffers+42} May 25 18:45:46 linux kernel: {create_empty_buffers+20} {:reiserfs:reiserfs_prepare_file_region_for_write+277} May 25 18:45:46 linux kernel: {:reiserfs:reiserfs_file_write+1459} May 25 18:45:46 linux kernel: {:reiserfs:reiserfs_dirty_inode+147} May 25 18:45:46 linux kernel: {inode_setattr+253} {:reiserfs:reiserfs_setattr+577} May 25 18:45:46 linux kernel: {__switch_to+314} {finish_task_switch+64} May 25 18:45:46 linux kernel: {thread_return+41} {vfs_write+243} May 25 18:45:46 linux kernel: {sys_write+83} {cstar_do_call+27} May 25 18:45:46 linux kernel: May 25 18:45:46 linux kernel: May 25 18:45:46 linux kernel: Code: 48 8b 91 f0 18 00 00 76 07 b8 00 00 00 80 eb 0a 48 b8 00 00 May 25 18:45:46 linux kernel: RIP {kmem_getpages+132} RSP May 25 18:45:46 linux kernel: CR2: 00000000000018f0 May 25 18:45:47 linux kernel: Unable to handle kernel paging request at 00000000000018f0 RIP: May 25 18:45:47 linux kernel: {kmem_getpages+132} May 25 18:45:47 linux kernel: PML4 16a44b067 PGD 16ac56067 PMD 0 May 25 18:45:47 linux kernel: Oops: 0000 [2] SMP May 25 18:45:47 linux kernel: CPU 1 May 25 18:45:47 linux kernel: Modules linked in: usbserial floppy parport_pc lp parport edd freq_table thermal processor fan button battery ac ipv6 snd_pcm_oss snd_mixer_oss snd_ioctl32 snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd soundcore snd_page_alloc af_packet subfs joydev sg st sr_mod ehci_hcd uhci_hcd ohci1394 ieee1394 ohci_hcd hw_random evdev dm_mod usbcore e1000 reiserfs sata_sil libata sd_mod scsi_mod May 25 18:45:47 linux kernel: Pid: 54, comm: pdflush Not tainted (2.6.8-24.10-smp SL92_BRANCH-200412221154270000) May 25 18:45:47 linux kernel: RIP: 0010:[] {kmem_getpages+132} May 25 18:45:47 linux kernel: RSP: 0000:000001017fcd3998 EFLAGS: 00010013 May 25 18:45:47 linux kernel: RAX: ffffffff7fffffff RBX: 000001007ffd98c0 RCX: 0000000000000000 May 25 18:45:47 linux kernel: RDX: 000001000000f780 RSI: 000001000000fb00 RDI: 000001000000f000 May 25 18:45:47 linux kernel: RBP: 000001017feba000 R08: 0000010139c0f000 R09: 0000000000000000 May 25 18:45:47 linux kernel: R10: 0000010140752a20 R11: 0000000000000001 R12: 000001007ffd98c0 May 25 18:45:47 linux kernel: R13: 000001007ffd9908 R14: 0000000000000000 R15: 0000000000000000 May 25 18:45:48 linux kernel: FS: 0000002a9958cf60(0000) GS:ffffffff804e2e80(0000) knlGS:00000000556f6080 May 25 18:45:48 linux kernel: CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b May 25 18:45:48 linux kernel: CR2: 00000000000018f0 CR3: 000000017ff98000 CR4: 00000000000006e0 May 25 18:45:48 linux kernel: Process pdflush (pid: 54, threadinfo 000001017fcd2000, task 000001017fc50030) May 25 18:45:48 linux kernel: Stack: 000001007fde0760 000001013adf1990 0000000000000000 ffffffff80162a49 May 25 18:45:48 linux kernel: 000001007ffd9968 0000000000000003 0000020000000200 000001017fcd3b78 May 25 18:45:48 linux kernel: 00000100070b9c00 0000000000000010 May 25 18:45:48 linux kernel: Call Trace:{cache_alloc_refill+665} {kmem_cache_alloc+54} May 25 18:45:48 linux kernel: {mempool_alloc+164} {autoremove_wake_function+0} May 25 18:45:48 linux kernel: {autoremove_wake_function+0} {bio_alloc+47} May 25 18:45:48 linux kernel: {submit_bh+175} {:reiserfs:write_ordered_chunk+0} May 25 18:45:48 linux kernel: {:reiserfs:write_ordered_chunk+73} May 25 18:45:48 linux kernel: {:reiserfs:add_to_chunk+105} {:reiserfs:write_ordered_buffers+305} May 25 18:45:48 linux kernel: {:reiserfs:flush_commit_list+483} May 25 18:45:48 linux kernel: {:reiserfs:do_journal_end+3178} {keventd_create_kthread+0} May 25 18:45:48 linux kernel: {:reiserfs:reiserfs_write_super+103} May 25 18:45:48 linux kernel: {__up_read+29} {sync_supers+125} May 25 18:45:48 linux kernel: {wb_kupdate+42} {pdflush+323} May 25 18:45:48 linux kernel: {wb_kupdate+0} {pdflush+0} May 25 18:45:48 linux kernel: {kthread+217} {child_rip+8} May 25 18:45:48 linux kernel: {keventd_create_kthread+0} {kthread+0} May 25 18:45:48 linux kernel: {child_rip+0} May 25 18:45:48 linux kernel: May 25 18:45:48 linux kernel: Code: 48 8b 91 f0 18 00 00 76 07 b8 00 00 00 80 eb 0a 48 b8 00 00 May 25 18:45:48 linux kernel: RIP {kmem_getpages+132} RSP May 25 18:45:48 linux kernel: CR2: 00000000000018f0 ================================================================================================== I thought this is a memory problem, we have changed memory and memtest86 runs clean, but the problem is still there. The problem can be reproduced by running bonnie++ benchmark. Is it possible that this is a disk problem? Thank you Evgeniy