Hi Andrew, While running the dbench benchmark on the reiserfs filesystem, over the x86_64 box booted with the 2.6.26-rc2-mm1 kernel. The Kernel BUG() is seen on the console. ------------[ cut here ]------------ kernel BUG at fs/reiserfs/journal.c:1414! invalid opcode: 0000 [1] SMP last sysfs file: /sys/devices/pci0000:20/0000:20:04.1/resource CPU 3 Modules linked in: Pid: 5160, comm: umount Not tainted 2.6.26-rc2-mm1-autotest #1 RIP: 0010:[<ffffffff802e47e5>] [<ffffffff802e47e5>] flush_journal_list+0x78/0x575 RSP: 0000:ffff8101fec6fb18 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffff81007edf7c00 RDI: ffffc2000210d0a0 RBP: ffff8101fec6fb58 R08: ffff8101fec6e000 R09: 0000000000000001 R10: 0000000000000000 R11: ffffc2000212f1b0 R12: ffff81007edf7c00 R13: 000000000000000d R14: ffff8101fe5d2c00 R15: ffffc2000210d000 FS: 0000000000000000(0000) GS:ffff8101fff07f80(0063) knlGS:00000000f7fbdb20 CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b CR2: 00000000f7f5d260 CR3: 00000001fb475000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process umount (pid: 5160, threadinfo ffff8101fec6e000, task ffff8101fe642c80) Stack: 00000000fec6fb10 ffffffff802a557b 00000000fc7593f0 ffffc2000210d000 ffff81007f65f900 000000000000000d ffff8101fe5d2c00 ffffc2000210d000 ffff8101fec6fba8 ffffffff802e4aff 000000000000000d 0000000100000001 Call Trace: [<ffffffff802a557b>] submit_bh+0x105/0x111 [<ffffffff802e4aff>] flush_journal_list+0x392/0x575 [<ffffffff802e7e76>] do_journal_end+0xb6d/0xe0c [<ffffffff80261f7f>] __writepage+0x0/0x2a [<ffffffff80263c1f>] pagevec_lookup_tag+0x20/0x2a [<ffffffff8025ad8e>] wait_on_page_writeback_range+0xeb/0x13e [<ffffffff802e8376>] do_journal_begin_r+0x261/0x2a2 [<ffffffff802e8a13>] do_journal_release+0x4c/0x180 [<ffffffff80242070>] bit_waitqueue+0x12/0xa4 [<ffffffff802e359e>] get_cnode+0x73/0x7e [<ffffffff802e517d>] journal_mark_dirty+0x150/0x247 [<ffffffff802e8b62>] journal_release+0xb/0xd [<ffffffff802d8c83>] reiserfs_put_super+0x7f/0xed [<ffffffff802859dc>] generic_shutdown_super+0x63/0xf2 [<ffffffff80286671>] kill_block_super+0x12/0x27 [<ffffffff802d8c00>] reiserfs_kill_sb+0x53/0x57 [<ffffffff80285893>] deactivate_super+0x46/0x5b [<ffffffff802993ff>] mntput_no_expire+0xe9/0x116 [<ffffffff8029b0a3>] sys_umount+0x349/0x35e [<ffffffff8024497f>] up_read+0x9/0xb [<ffffffff8021ee39>] do_page_fault+0x493/0x7e8 [<ffffffff803c2c24>] __up_write+0x10b/0x117 [<ffffffff8029b0c3>] sys_oldumount+0xb/0xd [<ffffffff80222b52>] ia32_sysret+0x0/0xa Code: ff ff 49 83 7c 24 40 00 75 04 0f 0b eb fe 83 7d d4 00 49 8d bf a0 00 00 00 74 07 e8 78 0d 23 00 eb 0d e8 21 10 23 00 85 c0 75 04 <0f> 0b eb fe c7 45 d0 00 00 00 00 41 8b 87 ec 00 00 00 48 39 c3 RIP [<ffffffff802e47e5>] flush_journal_list+0x78/0x575 RSP <ffff8101fec6fb18> ---[ end trace 6509cf142d99140b ]--- ------------[ cut here ]------------ WARNING: at kernel/exit.c:960 do_exit+0x41/0x6b1() Modules linked in: Pid: 5160, comm: umount Tainted: G D 2.6.26-rc2-mm1-autotest #1 Call Trace: [<ffffffff802300f4>] warn_on_slowpath+0x58/0x75 [<ffffffff80225d4b>] check_preempt_wakeup+0xde/0xe6 [<ffffffff80231012>] printk+0xa2/0xa4 [<ffffffff80232879>] do_exit+0x41/0x6b1 [<ffffffff8020cf11>] __die+0x0/0xe2 [<ffffffff8020d050>] die+0x5d/0x66 [<ffffffff8020d216>] do_trap+0x110/0x11f [<ffffffff8020d418>] do_invalid_op+0x93/0x9c [<ffffffff802e47e5>] flush_journal_list+0x78/0x575 [<ffffffff803b1cab>] __generic_unplug_device+0x22/0x26 [<ffffffff802a4236>] sync_buffer+0x0/0x3f [<ffffffff805151d7>] io_schedule+0x25/0x31 [<ffffffff805168d9>] error_exit+0x0/0x51 [<ffffffff802e47e5>] flush_journal_list+0x78/0x575 [<ffffffff802e47e1>] flush_journal_list+0x74/0x575 [<ffffffff802a557b>] submit_bh+0x105/0x111 [<ffffffff802e4aff>] flush_journal_list+0x392/0x575 [<ffffffff802e7e76>] do_journal_end+0xb6d/0xe0c [<ffffffff80261f7f>] __writepage+0x0/0x2a [<ffffffff80263c1f>] pagevec_lookup_tag+0x20/0x2a [<ffffffff8025ad8e>] wait_on_page_writeback_range+0xeb/0x13e [<ffffffff802e8376>] do_journal_begin_r+0x261/0x2a2 [<ffffffff802e8a13>] do_journal_release+0x4c/0x180 [<ffffffff80242070>] bit_waitqueue+0x12/0xa4 [<ffffffff802e359e>] get_cnode+0x73/0x7e [<ffffffff802e517d>] journal_mark_dirty+0x150/0x247 [<ffffffff802e8b62>] journal_release+0xb/0xd [<ffffffff802d8c83>] reiserfs_put_super+0x7f/0xed [<ffffffff802859dc>] generic_shutdown_super+0x63/0xf2 [<ffffffff80286671>] kill_block_super+0x12/0x27 [<ffffffff802d8c00>] reiserfs_kill_sb+0x53/0x57 [<ffffffff80285893>] deactivate_super+0x46/0x5b [<ffffffff802993ff>] mntput_no_expire+0xe9/0x116 [<ffffffff8029b0a3>] sys_umount+0x349/0x35e [<ffffffff8024497f>] up_read+0x9/0xb [<ffffffff8021ee39>] do_page_fault+0x493/0x7e8 [<ffffffff803c2c24>] __up_write+0x10b/0x117 [<ffffffff8029b0c3>] sys_oldumount+0xb/0xd [<ffffffff80222b52>] ia32_sysret+0x0/0xa ---[ end trace 6509cf142d99140b ]--- -- Thanks & Regards, Kamalesh Babulal, Linux Technology Center, IBM, ISTL. -- To 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