abrt version: 2.0.3 architecture: x86_64 cmdline: ro root=/dev/mapper/vg_quarlewm7-lv_root rd_LVM_LV=vg_quarlewm7/lv_root rd_LVM_LV=vg_quarlewm7/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us rhgb quiet comment: This happened after unplugging a USB drive which the system kept refusing to "remove safely." component: kernel kernel: undefined os_release: Fedora release 15 (Lovelock) package: kernel reason: BUG: MAX_STACK_TRACE_ENTRIES too low! time: Wed Jan 11 01:15:47 2012 backtrace: :BUG: MAX_STACK_TRACE_ENTRIES too low! :turning off the locking correctness validator. :Pid: 42, comm: khubd Not tainted 3.0.14-1.rt31.1.fc15.ccrma.x86_64.rt #1 :Call Trace: : [<ffffffff8108c442>] save_trace+0x9f/0xa5 : [<ffffffff8108de48>] mark_lock+0x99/0x220 : [<ffffffff8108e37b>] __lock_acquire+0x3ac/0xcf7 : [<ffffffff8108f499>] ? mark_held_locks+0x4b/0x6d : [<ffffffff8108f714>] ? debug_check_no_locks_freed+0x11b/0x130 : [<ffffffff8108f5c6>] ? trace_hardirqs_on_caller+0x10b/0x12f : [<ffffffff811a0c81>] ? sysfs_addrm_finish+0x36/0x55 : [<ffffffff8108f1bc>] lock_acquire+0xf3/0x13e : [<ffffffff811a0c81>] ? sysfs_addrm_finish+0x36/0x55 : [<ffffffff811a0573>] sysfs_deactivate+0x97/0xec : [<ffffffff811a0c81>] ? sysfs_addrm_finish+0x36/0x55 : [<ffffffff8108dddc>] ? mark_lock+0x2d/0x220 : [<ffffffff8100f9f5>] ? paravirt_read_tsc+0x9/0xd : [<ffffffff8100f9f5>] ? paravirt_read_tsc+0x9/0xd : [<ffffffff811a0c81>] sysfs_addrm_finish+0x36/0x55 : [<ffffffff8119f63f>] sysfs_hash_and_remove+0x59/0x7a : [<ffffffff811a0095>] sysfs_remove_file_from_group+0x3c/0x49 : [<ffffffff8137c7da>] usb_remove_sysfs_dev_files+0x3f/0x53 : [<ffffffff8136d91b>] usb_bus_notify+0x5c/0x73 : [<ffffffff814f4e4d>] notifier_call_chain+0x84/0xbb : [<ffffffff81095264>] ? rt_down_read+0x10/0x12 : [<ffffffff8107f99e>] __blocking_notifier_call_chain+0x67/0x84 : [<ffffffff8107f9cf>] blocking_notifier_call_chain+0x14/0x16 : [<ffffffff813160ed>] device_del+0x39/0x184 : [<ffffffff8137005a>] usb_disconnect+0x115/0x166 : [<ffffffff8137220d>] hub_thread+0x843/0x12bb : [<ffffffff814f1e3e>] ? _raw_spin_unlock_irq+0x4c/0x59 : [<ffffffff8104000a>] ? __driver_rfc4106_decrypt+0xbb/0x2bc : [<ffffffff8107a31d>] ? __init_waitqueue_head+0x7c/0x7c : [<ffffffff813719ca>] ? usb_remote_wakeup+0x64/0x64 : [<ffffffff81079a3a>] kthread+0x99/0xa1 : [<ffffffff8108b9e4>] ? trace_hardirqs_off+0xd/0xf : [<ffffffff8108f5f7>] ? trace_hardirqs_on+0xd/0xf : [<ffffffff814f8f24>] kernel_thread_helper+0x4/0x10 : [<ffffffff814f21d8>] ? retint_restore_args+0x13/0x13 : [<ffffffff810799a1>] ? __init_kthread_worker+0x8c/0x8c : [<ffffffff814f8f20>] ? gs_change+0x13/0x13
This seems to have been hit with a hand build -rt kernel. Fedora doesn't build or support that, so you'll need to take this up with upstream.