------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:-1 [inline], CPU#1: khidpd_15c25886/7187 WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#1: khidpd_15c25886/7187 WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x384/0x30a4 kernel/locking/lockdep.c:5187, CPU#1: khidpd_15c25886/7187 Modules linked in: CPU: 1 UID: 0 PID: 7187 Comm: khidpd_15c25886 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : hlock_class kernel/locking/lockdep.c:-1 [inline] pc : check_wait_context kernel/locking/lockdep.c:4854 [inline] pc : __lock_acquire+0x384/0x30a4 kernel/locking/lockdep.c:5187 lr : hlock_class kernel/locking/lockdep.c:238 [inline] lr : check_wait_context kernel/locking/lockdep.c:4854 [inline] lr : __lock_acquire+0x378/0x30a4 kernel/locking/lockdep.c:5187 sp : ffff8000a2617820 x29: ffff8000a2617900 x28: 0000000000000001 x27: ffff0000dbad8af8 x26: ffff80008afa88d4 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000dbad8000 x20: ffff8000975d0000 x19: 0000000000000000 x18: 1fffe00033781890 x17: ffff80008f86e000 x16: ffff800082e5c71c x15: 0000000000000001 x14: 1fffe000337818fa x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093397d48 x10: 0000000000ff0100 x9 : f68ea087e2424a00 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff800080575c38 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807f0908 x2 : 0000000000000001 x1 : 0000000100000002 x0 : 0000000000000000 Call trace: hlock_class kernel/locking/lockdep.c:-1 [inline] (P) check_wait_context kernel/locking/lockdep.c:4854 [inline] (P) __lock_acquire+0x384/0x30a4 kernel/locking/lockdep.c:5187 (P) lock_acquire+0x140/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline] set_task_blocked_on include/linux/sched.h:2165 [inline] __mutex_lock_common+0xd24/0x2678 kernel/locking/mutex.c:701 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 l2cap_unregister_user+0x74/0x190 net/bluetooth/l2cap_core.c:1729 hidp_session_thread+0x3d0/0x490 net/bluetooth/hidp/core.c:1304 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 irq event stamp: 120 hardirqs last enabled at (119): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1570 [inline] hardirqs last enabled at (119): [] finish_lock_switch+0xb0/0x1c0 kernel/sched/core.c:4995 hardirqs last disabled at (120): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (120): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (64): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (62): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000000000000c4 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000118d55000 [00000000000000c4] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 7187 Comm: khidpd_15c25886 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4854 [inline] pc : __lock_acquire+0x398/0x30a4 kernel/locking/lockdep.c:5187 lr : hlock_class kernel/locking/lockdep.c:238 [inline] lr : check_wait_context kernel/locking/lockdep.c:4854 [inline] lr : __lock_acquire+0x378/0x30a4 kernel/locking/lockdep.c:5187 sp : ffff8000a2617820 x29: ffff8000a2617900 x28: 0000000000000001 x27: ffff0000dbad8af8 x26: ffff80008afa88d4 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000dbad8000 x20: ffff8000975d0000 x19: 0000000000000000 x18: 1fffe00033781890 x17: ffff80008f86e000 x16: ffff800082e5c71c x15: 0000000000000001 x14: 1fffe000337818fa x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093397d48 x10: 0000000000ff0100 x9 : 00000000000c1a73 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff800080575c38 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807f0908 x2 : 0000000000000001 x1 : 0000000100000002 x0 : 0000000000000000 Call trace: hlock_class kernel/locking/lockdep.c:229 [inline] (P) check_wait_context kernel/locking/lockdep.c:4855 [inline] (P) __lock_acquire+0x398/0x30a4 kernel/locking/lockdep.c:5187 (P) lock_acquire+0x140/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline] set_task_blocked_on include/linux/sched.h:2165 [inline] __mutex_lock_common+0xd24/0x2678 kernel/locking/mutex.c:701 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 l2cap_unregister_user+0x74/0x190 net/bluetooth/l2cap_core.c:1729 hidp_session_thread+0x3d0/0x490 net/bluetooth/hidp/core.c:1304 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Code: 14000003 d00972eb 9135216b b9402369 (39431113) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 14000003 b 0xc 4: d00972eb adrp x11, 0x12e5e000 8: 9135216b add x11, x11, #0xd48 c: b9402369 ldr w9, [x27, #32] * 10: 39431113 ldrb w19, [x8, #196] <-- trapping instruction