Description of problem: MacBook Pro booted from EFI gets lockdep warning while starting X. Here's the dmesg: ========================================================= [ INFO: possible irq lock inversion dependency detected ] 2.6.24-0.80.rc4.git6.fc9 #1 --------------------------------------------------------- swapper/0 just changed the state of lock: (rtc_lock){.+..}, at: [<c040874c>] update_persistent_clock+0x11/0x2f but this lock took another, soft-irq-unsafe lock in the past: (efi_rt_lock){--..} and interrupts could create inverse lock ordering between them. other info that might help us debug this: no locks held by swapper/0. the first lock's dependencies: -> (rtc_lock){.+..} ops: 0 { initial-use at: [<c044d3d9>] __lock_acquire+0x500/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c0641e7a>] _spin_lock_irqsave+0x4a/0x77 [<c040871f>] read_persistent_clock+0xf/0x2b [<c07875da>] timekeeping_init+0xe/0x160 [<c0774915>] start_kernel+0x21a/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff in-softirq-W at: [<c044d353>] __lock_acquire+0x47a/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c0641e7a>] _spin_lock_irqsave+0x4a/0x77 [<c040874c>] update_persistent_clock+0x11/0x2f [<c0446bae>] sync_cmos_clock+0x49/0xa5 [<c04371b0>] run_timer_softirq+0x127/0x18f [<c0434689>] __do_softirq+0x78/0xff [<c0407759>] do_softirq+0x74/0xf7 [<ffffffff>] 0xffffffff } ... key at: [<c072faf0>] rtc_lock+0x10/0x20 -> (efi_rt_lock){--..} ops: 0 { initial-use at: [<c044d3d9>] __lock_acquire+0x500/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c041fb57>] efi_get_time+0x27/0x86 [<c042223e>] native_get_wallclock+0x17/0x108 [<c0408727>] read_persistent_clock+0x17/0x2b [<c07875da>] timekeeping_init+0xe/0x160 [<c0774915>] start_kernel+0x21a/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff softirq-on-W at: [<c044d3c5>] __lock_acquire+0x4ec/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c07835b2>] efi_enter_virtual_mode+0xcb/0x174 [<c07749f6>] start_kernel+0x2fb/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff hardirq-on-W at: [<c044d3a5>] __lock_acquire+0x4cc/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c07835b2>] efi_enter_virtual_mode+0xcb/0x174 [<c07749f6>] start_kernel+0x2fb/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff } ... key at: [<c0732210>] efi_rt_lock+0x10/0x20 ... acquired at: [<c044d955>] __lock_acquire+0xa7c/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c041fb57>] efi_get_time+0x27/0x86 [<c042223e>] native_get_wallclock+0x17/0x108 [<c0408727>] read_persistent_clock+0x17/0x2b [<c07875da>] timekeeping_init+0xe/0x160 [<c0774915>] start_kernel+0x21a/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff the second lock's dependencies: -> (efi_rt_lock){--..} ops: 0 { initial-use at: [<c044d3d9>] __lock_acquire+0x500/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c041fb57>] efi_get_time+0x27/0x86 [<c042223e>] native_get_wallclock+0x17/0x108 [<c0408727>] read_persistent_clock+0x17/0x2b [<c07875da>] timekeeping_init+0xe/0x160 [<c0774915>] start_kernel+0x21a/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff softirq-on-W at: [<c044d3c5>] __lock_acquire+0x4ec/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c07835b2>] efi_enter_virtual_mode+0xcb/0x174 [<c07749f6>] start_kernel+0x2fb/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff hardirq-on-W at: [<c044d3a5>] __lock_acquire+0x4cc/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c06419d0>] _spin_lock+0x2e/0x58 [<c041f9da>] efi_call_phys_prelog+0x10/0x9c [<c07835b2>] efi_enter_virtual_mode+0xcb/0x174 [<c07749f6>] start_kernel+0x2fb/0x367 [<00000000>] 0x0 [<ffffffff>] 0xffffffff } ... key at: [<c0732210>] efi_rt_lock+0x10/0x20 stack backtrace: Pid: 0, comm: swapper Not tainted 2.6.24-0.80.rc4.git6.fc9 #1 [<c040649a>] show_trace_log_lvl+0x1a/0x2f [<c0406d41>] show_trace+0x12/0x14 [<c0407061>] dump_stack+0x6c/0x72 [<c044b9f0>] print_irq_inversion_bug+0x10c/0x116 [<c044c3ce>] check_usage_forwards+0x3e/0x44 [<c044c546>] mark_lock+0x172/0x472 [<c044d353>] __lock_acquire+0x47a/0xc4d [<c044dfa0>] lock_acquire+0x7b/0x9e [<c0641e7a>] _spin_lock_irqsave+0x4a/0x77 [<c040874c>] update_persistent_clock+0x11/0x2f [<c0446bae>] sync_cmos_clock+0x49/0xa5 [<c04371b0>] run_timer_softirq+0x127/0x18f [<c0434689>] __do_softirq+0x78/0xff [<c0407759>] do_softirq+0x74/0xf7 =======================
Just FWIW, this doesn't actually seem to have anything to do with starting X. It just happens randomly while the system is running.
Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
~Attention~ This bug appears to pertain to an important F11 feature, EFI, which the Fedora Community will be testing in an upcoming Fedora Test Day. Your participation in the action would be greatly appreciated! More information: https://fedoraproject.org/wiki/QA/Test_Days/2009-04-09 https://fedoraproject.org/wiki/Features/EFI
This message is a reminder that Fedora 9 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 9. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '9'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 9's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 9 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Fedora 9 changed to end-of-life (EOL) status on 2009-07-10. Fedora 9 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.