watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.4:6457] Modules linked in: irq event stamp: 100121 hardirqs last enabled at (100120): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (100120): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (100121): [] __el1_irq arch/arm64/kernel/entry-common.c:470 [inline] hardirqs last disabled at (100121): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (92278): [] softirq_handle_end kernel/softirq.c:414 [inline] softirqs last enabled at (92278): [] __do_softirq+0xac0/0xd54 kernel/softirq.c:600 softirqs last disabled at (95145): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 CPU: 0 PID: 6457 Comm: syz-executor.4 Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_kcov_mode kernel/kcov.c:173 [inline] pc : write_comp_data kernel/kcov.c:236 [inline] pc : __sanitizer_cov_trace_cmp8+0x40/0x90 kernel/kcov.c:284 lr : ktime_compare include/linux/ktime.h:97 [inline] lr : ktime_after include/linux/ktime.h:113 [inline] lr : get_packet_txtime net/sched/sch_taprio.c:531 [inline] lr : taprio_enqueue_one+0xd50/0x146c net/sched/sch_taprio.c:574 sp : ffff8000800071f0 x29: ffff8000800073a0 x28: ffff0001178d3130 x27: 0000000000000000 x26: 1fffe00022f1a22b x25: 0524bb526da25641 x24: 0524bb526da25600 x23: ffff0001178d1158 x22: ffff0001178d3000 x21: 0524bb526da2565d x20: 0000000000000001 x19: 0524bb526da255c1 x18: ffff800080006e40 x17: 0000000000000000 x16: ffff80008050b4cc x15: 000000000001cc05 x14: 1ffff00011bde0ac x13: ffffffff80000040 x12: 0000000080000040 x11: 0000000000000302 x10: 0000000000000100 x9 : 0000000000000000 x8 : ffff0000ce9eb780 x7 : 0000000000000000 x6 : ffff8000800072f0 x5 : ffff800080007310 x4 : 0524bb51eda2569d x3 : ffff80008898bde8 x2 : 0000000000000000 x1 : 0524bb526da25600 x0 : 0524bb526da2565d Call trace: check_kcov_mode kernel/kcov.c:173 [inline] write_comp_data kernel/kcov.c:236 [inline] __sanitizer_cov_trace_cmp8+0x40/0x90 kernel/kcov.c:284 taprio_enqueue+0x328/0x544 net/sched/sch_taprio.c:655 dev_qdisc_enqueue+0x60/0x35c net/core/dev.c:3773 __dev_xmit_skb net/core/dev.c:3862 [inline] __dev_queue_xmit+0xb24/0x3318 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3088 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0xd2c/0x1a1c net/ipv6/ip6_output.c:134 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x538/0x8c8 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:458 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ndisc_send_skb+0xc30/0x1790 net/ipv6/ndisc.c:508 ndisc_send_rs+0x47c/0x5d4 net/ipv6/ndisc.c:718 addrconf_rs_timer+0x300/0x58c net/ipv6/addrconf.c:3936 call_timer_fn+0x19c/0x8cc kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x55c/0x734 kernel/time/timer.c:2022 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2035 __do_softirq+0x2d0/0xd54 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:882 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:488 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:493 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:587 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:182 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:202 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline] __skb_try_recv_datagram+0x198/0x584 net/core/datagram.c:265 __unix_dgram_recvmsg+0x2f8/0xe2c net/unix/af_unix.c:2452 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2549 sock_recvmsg_nosec+0x90/0xec net/socket.c:1019 ____sys_recvmsg+0x5c0/0x6e8 net/socket.c:2720 ___sys_recvmsg net/socket.c:2764 [inline] do_recvmmsg+0x41c/0xb60 net/socket.c:2858 __sys_recvmmsg net/socket.c:2937 [inline] __do_sys_recvmmsg net/socket.c:2960 [inline] __se_sys_recvmmsg net/socket.c:2953 [inline] __arm64_sys_recvmmsg+0x180/0x23c net/socket.c:2953 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591