watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.4:16186] Modules linked in: irq event stamp: 45523271 hardirqs last enabled at (45523270): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 hardirqs last disabled at (45523271): [] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline] hardirqs last disabled at (45523271): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551 softirqs last enabled at (2866): [] pneigh_ifdown_and_unlock net/core/neighbour.c:865 [inline] softirqs last enabled at (2866): [] __neigh_ifdown+0x198/0x390 net/core/neighbour.c:447 softirqs last disabled at (2892): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (2892): [] batadv_tt_local_resize_to_mtu+0x60/0x154 net/batman-adv/translation-table.c:3949 CPU: 0 PID: 16186 Comm: syz-executor.4 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : should_resched arch/arm64/include/asm/preempt.h:79 [inline] pc : __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:388 lr : __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 sp : ffff800097bd6540 x29: ffff800097bd6550 x28: dfff800000000000 x27: 1fffe000318aa0a1 x26: ffff00018c550518 x25: ffff00018c550508 x24: 0000000000000001 x23: 1fffe00019a91781 x22: dfff800000000000 x21: ffff80008aada0b0 x20: 0000000000000202 x19: ffff0000cd48bc08 x18: ffff800097bd5c80 x17: 77656e2074696620 x16: ffff80008032116c x15: 0000000000000001 x14: 1fffe00031a18f60 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000040000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000002b6a146 x7 : ffff80008aad9f28 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008aedea60 x0 : ffff800125414000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline] __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_tt_local_purge_pending_clients+0x278/0x300 net/batman-adv/translation-table.c:3673 batadv_tt_local_resize_to_mtu+0xa8/0x154 net/batman-adv/translation-table.c:3957 batadv_hard_if_event+0x41c/0xe04 notifier_call_chain+0x1a4/0x510 kernel/notifier.c:93 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461 call_netdevice_notifiers_info net/core/dev.c:1966 [inline] call_netdevice_notifiers_mtu+0x170/0x20c net/core/dev.c:2041 dev_set_mtu_ext+0x3c8/0x544 net/core/dev.c:8791 do_setlink+0x810/0x3794 net/core/rtnetlink.c:2869 __rtnl_newlink net/core/rtnetlink.c:3704 [inline] rtnl_newlink+0x14c0/0x1bcc net/core/rtnetlink.c:3751 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6617 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6635 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 40 Comm: kworker/u4:2 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 lr : queued_spin_lock_slowpath+0x168/0xcf8 kernel/locking/qspinlock.c:383 sp : ffff800093e67720 x29: ffff800093e677c0 x28: 1fffe000199b6a6a x27: 1ffff000127ccef0 x26: dfff800000000000 x25: 1fffe000199b6a6c x24: ffff800093e67740 x23: ffff800093e67780 x22: ffff7000127ccee8 x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000ccdb5350 x18: ffff0001b4037840 x17: ffff800125436000 x16: ffff8000809fd934 x15: 0000000000000001 x14: 1fffe000199b6a6a x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000199b6a6b x10: 1fffe000199b6a6a x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff80008aad75f4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008ae5db50 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x320/0x348 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_tt_local_commit_changes+0x24/0x44 net/batman-adv/translation-table.c:3717 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:811 [inline] batadv_iv_ogm_schedule+0x1ec/0xdf0 net/batman-adv/bat_iv_ogm.c:868 batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x900 net/batman-adv/bat_iv_ogm.c:1712 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 vkms_vblank_simulate: vblank timer overrun