Rajat Asthana <rajatasthana4@xxxxxxxxx> wrote: > Syzkaller reported a lockdep warning on non-initialized spinlock: > > INFO: trying to register non-static key. > The code is fine but needs lockdep annotation, or maybe > you didn't initialize this object before use? > turning off the locking correctness validator. > CPU: 0 PID: 10 Comm: ksoftirqd/0 Not tainted 5.13.0-rc4-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x143/0x1db lib/dump_stack.c:120 > assign_lock_key kernel/locking/lockdep.c:937 [inline] > register_lock_class+0x1077/0x1180 kernel/locking/lockdep.c:1249 > __lock_acquire+0x102/0x5230 kernel/locking/lockdep.c:4781 > lock_acquire kernel/locking/lockdep.c:5512 [inline] > lock_acquire+0x19d/0x700 kernel/locking/lockdep.c:5477 > __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] > _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 > spin_lock_bh include/linux/spinlock.h:359 [inline] > ath9k_wmi_event_tasklet+0x231/0x3f0 drivers/net/wireless/ath/ath9k/wmi.c:172 > tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:784 > __do_softirq+0x1b0/0x944 kernel/softirq.c:559 > run_ksoftirqd kernel/softirq.c:921 [inline] > run_ksoftirqd+0x21/0x50 kernel/softirq.c:913 > smpboot_thread_fn+0x3ec/0x870 kernel/smpboot.c:165 > kthread+0x38c/0x460 kernel/kthread.c:313 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > > We missed a spin_lock_init() in ath9k_wmi_event_tasklet() when the wmi > event is WMI_TXSTATUS_EVENTID. So, add a spin_lock_init() in > ath9k_init_wmi(). > > Signed-off-by: Rajat Asthana <rajatasthana4@xxxxxxxxx> > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> The lock is already initialised in ath9k_init_priv(), so now the same lock is initialised twice. ath9k_init_wmi() is called before ath9k_init_priv(), so it looks like we have a race somewhere. Patch set to Changes Requested. -- https://patchwork.kernel.org/project/linux-wireless/patch/20210728192533.18727-1-rajatasthana4@xxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
