watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.7.1791:11261] Modules linked in: irq event stamp: 1532 hardirqs last enabled at (1531): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (1531): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 hardirqs last disabled at (1532): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:153 [inline] hardirqs last disabled at (1532): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:181 softirqs last enabled at (936): [] spin_unlock_bh include/linux/spinlock.h:407 [inline] softirqs last enabled at (936): [] release_sock+0x150/0x228 net/core/sock.c:3879 softirqs last disabled at (934): [] spin_lock_bh include/linux/spinlock.h:353 [inline] softirqs last disabled at (934): [] release_sock+0x34/0x228 net/core/sock.c:3866 CPU: 0 UID: 0 PID: 11261 Comm: syz.7.1791 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 sp : ffff8000903d6700 x29: ffff8000903d6700 x28: 1fffe00019fb2543 x27: 1fffe0001b2d950c x26: ffff8000903d6740 x25: ffff0000d96ca864 x24: dfff800000000000 x23: ffff70001207ace8 x22: ffff0000c87ad7a0 x21: 0000000000000000 x20: ffff0000d96ca820 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 000000000000461a x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080155708 x10: 0000000000080000 x9 : ffff800125484000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff800080483190 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000801557b0 x2 : 0000000000000000 x1 : ffff0000c96e1d80 x0 : ffff80008688ce24 dump_backtrace(regs = 00000000251a8feb 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) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 (P) spin_unlock_irqrestore include/linux/spinlock.h:425 [inline] siw_cep_set_inuse+0x2d8/0x360 drivers/infiniband/sw/siw/siw_cm.c:281 siw_drop_listeners drivers/infiniband/sw/siw/siw_cm.c:1971 [inline] siw_destroy_listen+0x174/0x3d0 drivers/infiniband/sw/siw/siw_cm.c:1989 destroy_cm_id+0x378/0x570 drivers/infiniband/core/iwcm.c:398 iw_destroy_cm_id+0x20/0xa8 drivers/infiniband/core/iwcm.c:450 _destroy_id+0x2b4/0x91c drivers/infiniband/core/cma.c:2070 cma_send_device_removal_put drivers/infiniband/core/cma.c:5321 [inline] cma_process_remove+0x34c/0x470 drivers/infiniband/core/cma.c:5346 cma_add_one+0x718/0x9fc drivers/infiniband/core/cma.c:5433 add_client_context+0x2e8/0x4d4 drivers/infiniband/core/device.c:755 enable_device_and_get+0x17c/0x3b0 drivers/infiniband/core/device.c:1375 ib_register_device+0x7a0/0x9e4 drivers/infiniband/core/device.c:1503 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline] siw_newlink+0x74c/0xbe0 drivers/infiniband/sw/siw/siw_main.c:430 nldev_newlink+0x47c/0x4f4 drivers/infiniband/core/nldev.c:1858 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x4f0/0x814 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11248 Comm: syz.2.1790 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 63400005 (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 : ffff8000903b7540 x29: ffff8000903b7680 x28: dfff800000000000 x27: 0000000000000001 x26: 0000000000000000 x25: 0000000000000011 x24: 0000000000000000 x23: ffffffffffffffff x22: 1fffe00035bdc680 x21: ffff0001adec3688 x20: ffff0000f13d5038 x19: ffff0001adee3400 x18: 1fffe00035bd9828 x17: 0000000000000003 x16: ffff800088a77000 x15: ffff800088b27780 x14: ffff0001adecc14c x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : ffff8000803b1e70 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008059ee30 x2 : 0000000000000000 x1 : ffff0000f13d3b00 x0 : 0000000000000001 dump_backtrace(regs = 0000000003d093ba 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_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210 static_key_enable+0x24/0x38 kernel/jump_label.c:223 ddebug_change lib/dynamic_debug.c:255 [inline] ddebug_exec_query lib/dynamic_debug.c:561 [inline] ddebug_exec_queries+0xbe8/0x14a0 lib/dynamic_debug.c:587 ddebug_proc_write+0x64/0xe8 lib/dynamic_debug.c:1022 full_proxy_write+0x11c/0x160 fs/debugfs/file.c:389 vfs_write+0x2a4/0xa0c fs/read_write.c:685 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 wireguard: wg2: Handshake for peer 13 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 8) wireguard: wg0: Sending keepalive packet to peer 56 ([::1]:20003/0%0) wireguard: wg1: Sending keepalive packet to peer 45 (127.0.0.1:20001) wireguard: wg0: Sending keepalive packet to peer 44 ([::1]:20003/0%0) wireguard: wg0: Retrying handshake with peer 56 ([::1]:20003/0%0) 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 wireguard: wg1: Retrying handshake with peer 58 (127.0.0.1:20003) because we stopped hearing back after 15 seconds wireguard: wg0: Sending keepalive packet to peer 56 ([::1]:20003/0%0) wireguard: wg0: Handshake for peer 44 ([::1]:20003/0%0) did not complete after 5 seconds, retrying (try 2) wireguard: wg2: Handshake for peer 13 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 2) wireguard: wg2: Handshake for peer 14 (127.0.0.1:20002) 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) kobject: 'brport' (00000000c7c5fea6): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (00000000c7c5fea6): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000d1e038ea): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (00000000d1e038ea): calling ktype release kobject: 'brport': free name