watchdog: BUG: soft lockup - CPU#0 stuck for 39s! [kworker/u9:5:4720] Modules linked in: irq event stamp: 8233 hardirqs last enabled at (8233): [] kasan_quarantine_put+0xb4/0x1c4 mm/kasan/quarantine.c:234 hardirqs last disabled at (8232): [] kasan_quarantine_put+0x38/0x1c4 mm/kasan/quarantine.c:207 softirqs last enabled at (8216): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (8214): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (8214): [] __alloc_skb+0x1a8/0x610 net/core/skbuff.c:697 CPU: 0 UID: 0 PID: 4720 Comm: kworker/u9:5 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Workqueue: hci2 hci_cmd_sync_work pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x168/0x320 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x148/0x320 kernel/locking/lockdep.c:5945 sp : ffff800094cb76f0 x29: ffff800094cb7740 x28: 0000000000000000 x27: ffff0000d4390000 x26: ffff8000897422f8 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff80008abef1a0 x21: ffff800085af9660 x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000135a84 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff800080483084 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080492fe4 x2 : 0000000100000001 x1 : ffff0000d4390000 x0 : 0000000000000000 dump_backtrace(regs = 0000000089d5e05c tsk = 0000000000000000) Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x168/0x320 kernel/locking/lockdep.c:5946 (P) __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0x1078 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 hci_connect_cfm include/net/bluetooth/hci_core.h:2164 [inline] hci_conn_failed+0x16c/0x37c net/bluetooth/hci_conn.c:1442 hci_abort_conn_sync+0x5a4/0x938 net/bluetooth/hci_sync.c:6035 abort_conn_sync+0x58/0x8c net/bluetooth/hci_conn.c:3215 hci_cmd_sync_work+0x1e8/0x380 net/bluetooth/hci_sync.c:338 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4832 Comm: kworker/1:8 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Workqueue: events perf_sched_delayed pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:363 [inline] pc : smp_call_function_many_cond+0x1104/0x14e0 kernel/smp.c:1002 lr : csd_lock_wait kernel/smp.c:363 [inline] lr : smp_call_function_many_cond+0x111c/0x14e0 kernel/smp.c:1002 sp : ffff8000962b7880 x29: ffff8000962b79c0 x28: dfff800000000000 x27: 0000000000000001 x26: 0000000000000000 x25: 0000000000000011 x24: 0000000000000000 x23: ffffffffffffffff x22: 1fffe000349fea80 x21: ffff0001a4fd56c8 x20: ffff0000f3d6edb8 x19: ffff0001a4ff5400 x18: 1fffe000349fbc28 x17: 0000000000000003 x16: ffff800089797000 x15: ffff8000898476c0 x14: 0000000000000002 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff6000349faada x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : ffff8000801690e0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008059ee08 x2 : 0000000000000000 x1 : ffff0000f3d6d880 x0 : 0000000000000000 dump_backtrace(regs = 000000000735cafa tsk = 0000000000000000) Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:363 [inline] (P) smp_call_function_many_cond+0x1104/0x14e0 kernel/smp.c:1002 (P) smp_call_function kernel/smp.c:1043 [inline] kick_all_cpus_sync+0x34/0x40 kernel/smp.c:1192 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x31c/0x344 kernel/jump_label.c:521 jump_label_update+0x428/0x4b8 kernel/jump_label.c:909 static_key_disable_cpuslocked+0xd0/0x1dc kernel/jump_label.c:240 static_key_disable+0x24/0x38 kernel/jump_label.c:248 perf_sched_delayed+0x78/0xc0 kernel/events/core.c:5666 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 wireguard: wg0: Sending keepalive packet to peer 8 ([::1]:20003/0%0) nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188) bridge1: hello timer expired wireguard: wg0: Handshake for peer 7 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 2) wireguard: wg2: Handshake for peer 30 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 2) wireguard: wg0: Sending keepalive packet to peer 62 ([::1]:20003/0%0) wireguard: wg2: Handshake for peer 48 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 10) wireguard: wg1: Handshake for peer 10 (127.0.0.1:20003) did not complete after 5 seconds, retrying (try 2) wireguard: wg2: Handshake for peer 11 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 6) wireguard: wg0: Handshake for peer 8 ([::1]:20003/0%0) did not complete after 5 seconds, retrying (try 2) wireguard: wg0: Handshake for peer 68 ([::1]:20003/0%0) did not complete after 5 seconds, retrying (try 3) wireguard: wg2: Retrying handshake with peer 12 (127.0.0.1:20002) because we stopped hearing back after 15 seconds wireguard: wg0: Retrying handshake with peer 68 ([::1]:20003/0%0) because we stopped hearing back after 15 seconds geneve1: no route to fc00:0000:0000:0000:0000:0000:0000:0001 wireguard: wg2: Retrying handshake with peer 30 (127.0.0.1:20002) because we stopped hearing back after 15 seconds wireguard: wg0: Retrying handshake with peer 44 ([::1]:20003/0%0) because we stopped hearing back after 15 seconds Dropped {multi|broad}cast of type=[86dd] gtp0: no PDP ctx found for ff02:0000:0000:0000:0000:0000:0000:0002, skip nf_nat: Already setup manip DST for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188) percpu_ref_switch_to_atomic_rcu: global 9223372036854775801 percpu 8 nf_nat: Already setup manip DST for ct 00000000b0df4ee9 (status bits 0x188) nf_nat: Already setup manip SRC for ct 00000000b0df4ee9 (status bits 0x188) vcan0: __j1939_priv_release: 0x000000002a63d827 nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip DST for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip DST for ct 00000000f97a9a5a (status bits 0x188) nf_nat: Already setup manip SRC for ct 00000000f97a9a5a (status bits 0x188)