Messages in this thread | | | Date | Tue, 31 Mar 2020 11:57:37 +0200 | From | Peter Zijlstra <> | Subject | Re: INFO: trying to register non-static key in try_to_wake_up |
| |
On Mon, Mar 30, 2020 at 10:01:12PM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 9420e8ad Merge tag 'for-linus' of git://git.kernel.org/pub.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1206ed4be00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692 > dashboard link: https://syzkaller.appspot.com/bug?extid=e84d7ebd1361da13c356 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+e84d7ebd1361da13c356@syzkaller.appspotmail.com > > INFO: trying to register non-static key. > the code is fine but needs lockdep annotation. > turning off the locking correctness validator. > CPU: 1 PID: 1014 Comm: syz-executor.0 Not tainted 5.6.0-rc7-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x188/0x20d lib/dump_stack.c:118 > assign_lock_key kernel/locking/lockdep.c:880 [inline] > register_lock_class+0x14c4/0x1540 kernel/locking/lockdep.c:1189 > __lock_acquire+0xfc/0x3ca0 kernel/locking/lockdep.c:3836 > lock_acquire+0x197/0x420 kernel/locking/lockdep.c:4484 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159 > try_to_wake_up+0x9f/0x17c0 kernel/sched/core.c:2547
That's p->pi_lock, which gets initialized in rt_mutex_init_task() in copy_process(). This should be impossible. Very odd.
> wake_up_worker kernel/workqueue.c:836 [inline] > insert_work+0x2ad/0x3a0 kernel/workqueue.c:1337 > __queue_work+0x50d/0x1280 kernel/workqueue.c:1488 > call_timer_fn+0x195/0x760 kernel/time/timer.c:1404 > expire_timers kernel/time/timer.c:1444 [inline] > __run_timers kernel/time/timer.c:1773 [inline] > __run_timers kernel/time/timer.c:1740 [inline] > run_timer_softirq+0x412/0x1600 kernel/time/timer.c:1786 > __do_softirq+0x26c/0x99d kernel/softirq.c:292 > invoke_softirq kernel/softirq.c:373 [inline] > irq_exit+0x192/0x1d0 kernel/softirq.c:413 > exiting_irq arch/x86/include/asm/apic.h:546 [inline] > smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1146 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 > </IRQ>
| |