Hi, While using a program that does lot of file manipulation on a dual processor AMD Opteron system, the system reboots. During one of the two times it happened, the following ended up in the /var/log/messages. The problem is not reproducible, it just happens in a few days. The kernel is from Fedora Core 3, but not the latest. There are no other kernel modules. I have searched on the mailing lists, but nothing specific to this. Any ideas on what might be wrong? Thanks Amit Kernel version: Feb 6 10:45:54 GEN kernel: Linux version 2.6.12-1.1372_FC3smp (bhcompile@xxxxxxxxxxxxxxxxxxxxxx) (gcc version 3.4.3 20050227 (Red Hat 3.4.3-22)) #1 SMP Fri Jul 15 01:08:54 EDT 2005 Feb 2 18:55:47 nc-analyzer kernel: ----------- [cut here ] --------- [please bite here ] --------- Feb 2 18:55:47 nc-analyzer kernel: Kernel BUG at "mm/page_alloc.c":413 Feb 2 18:55:47 nc-analyzer kernel: invalid operand: 0000 [1] SMP Feb 2 18:55:47 nc-analyzer kernel: CPU 0 Feb 2 18:55:47 nc-analyzer kernel: Modules linked in: md5 ipv6 ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables dm_mod video button battery ac ohci_hcd i2c_amd8111 i2c_core hw_random tg3 floppy ext3 jbd 3w_9xxx sd_mod scsi_mod Feb 2 18:55:47 nc-analyzer kernel: Pid: 3161, comm: AgentEventRecor Not tainted 2.6.12-1.1372_FC3smp Feb 2 18:55:47 nc-analyzer kernel: RIP: 0010:[<ffffffff80166454>] <ffffffff80166454>{__rmqueue+196} Feb 2 18:55:47 nc-analyzer kernel: RSP: 0018:ffff81024a149a18 EFLAGS: 00010002 Feb 2 18:55:47 nc-analyzer kernel: RAX: 0000000000000001 RBX: ffff810000017418 RCX: ffff810000015000 Feb 2 18:55:47 nc-analyzer kernel: RDX: 000000000012d340 RSI: 0000000000001000 RDI: ffff810000016300 Feb 2 18:55:47 nc-analyzer kernel: RBP: ffff8100051e3600 R08: 0000000000000001 R09: 0000000000000001 Feb 2 18:55:47 nc-analyzer kernel: R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000040 Feb 2 18:55:47 nc-analyzer kernel: R13: 0000000000000006 R14: ffff810000016300 R15: ffff8100051e2800 Feb 2 18:55:47 nc-analyzer kernel: FS: 00002aaaaba8b3a0(0000) GS:ffffffff80502200(0000) knlGS:0000000000000000 Feb 2 18:55:47 nc-analyzer kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Feb 2 18:55:47 nc-analyzer kernel: CR2: 000000000069d000 CR3: 000000012d23f000 CR4: 00000000000006e0 Feb 2 18:55:47 nc-analyzer kernel: Process AgentEventRecor (pid: 3161, threadinfo ffff81024a148000, task ffff8102fbd99840) Feb 2 18:55:47 nc-analyzer kernel: Stack: 0000000000000286 ffff810000016380 ffff810000016300 0000000000000000 Feb 2 18:55:47 nc-analyzer kernel: ffff810000016390 0000000000000002 0000000000000000 ffffffff8016692c Feb 2 18:55:47 nc-analyzer kernel: 0000000000000292 ffff810000017380 Feb 2 18:55:47 nc-analyzer kernel: Call Trace:<ffffffff8016692c>{buffered_rmqueue+172} <ffffffff80166d17>{__alloc_pages+231} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80163e11>{generic_file_buffered_write+417} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8013da95>{current_fs_time+85} <ffffffff80209e72>{copy_user_generic_c+8} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff801a18ee>{inode_update_time+62} <ffffffff8016484a>{__generic_file_aio_write_nolock+970} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80162eb0>{file_read_actor+0} <ffffffff80164a2e>{__generic_file_write_nolock+158} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80164f5f>{__generic_file_aio_read+431} <ffffffff8017366f>{do_no_page+879} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8014f020>{autoremove_wake_function+0} <ffffffff80185d8d>{do_sync_read+173} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80164ac5>{generic_file_writev+117} <ffffffff8018658f>{do_readv_writev+399} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80185f20>{do_sync_write+0} <ffffffff8034e782>{thread_return+155} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8014f020>{autoremove_wake_function+0} <ffffffff801bdaee>{dnotify_parent+46} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80186823>{sys_writev+83} <ffffffff8010eaa6>{system_call+126} Feb 2 18:55:47 nc-analyzer kernel: Feb 2 18:55:47 nc-analyzer kernel: Feb 2 18:55:47 nc-analyzer kernel: Code: 0f 0b 77 01 37 80 ff ff ff ff 9d 01 48 8b 13 48 8d 45 28 48 Feb 2 18:55:47 nc-analyzer kernel: RIP <ffffffff80166454>{__rmqueue+196} RSP <ffff81024a149a18> Feb 2 18:55:47 nc-analyzer kernel: <3>Debug: sleeping function called from invalid context at include/linux/rwsem.h:43 Feb 2 18:55:47 nc-analyzer kernel: in_atomic():0, irqs_disabled():1 Feb 2 18:55:47 nc-analyzer kernel: Feb 2 18:55:47 nc-analyzer kernel: Call Trace:<ffffffff80132435>{__might_sleep+197} <ffffffff801394c9>{profile_task_exit+41} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8013ae12>{do_exit+34} <ffffffff8025ea75>{do_unblank_screen+53} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8011047d>{die+77} <ffffffff801108c1>{do_invalid_op+145} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80166454>{__rmqueue+196} <ffffffff8803f926>{:jbd:do_get_write_access+1446} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8010f5c9>{error_exit+0} <ffffffff80166454>{__rmqueue+196} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80166450>{__rmqueue+192} <ffffffff8016692c>{buffered_rmqueue+172} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80166d17>{__alloc_pages+231} <ffffffff80163e11>{generic_file_buffered_write+417} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8013da95>{current_fs_time+85} <ffffffff80209e72>{copy_user_generic_c+8} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff801a18ee>{inode_update_time+62} <ffffffff8016484a>{__generic_file_aio_write_nolock+970} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80162eb0>{file_read_actor+0} <ffffffff80164a2e>{__generic_file_write_nolock+158} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80164f5f>{__generic_file_aio_read+431} <ffffffff8017366f>{do_no_page+879} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8014f020>{autoremove_wake_function+0} <ffffffff80185d8d>{do_sync_read+173} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80164ac5>{generic_file_writev+117} <ffffffff8018658f>{do_readv_writev+399} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80185f20>{do_sync_write+0} <ffffffff8034e782>{thread_return+155} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff8014f020>{autoremove_wake_function+0} <ffffffff801bdaee>{dnotify_parent+46} Feb 2 18:55:47 nc-analyzer kernel: <ffffffff80186823>{sys_writev+83} <ffffffff8010eaa6>{system_call+126} Feb 2 18:55:47 nc-analyzer kernel: -- fedora-devel-list mailing list 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