watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.4:12938] Modules linked in: irq event stamp: 68813 hardirqs last enabled at (68812): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (68812): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (68813): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (68813): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (58628): [] softirq_handle_end kernel/softirq.c:414 [inline] softirqs last enabled at (58628): [] __do_softirq+0xac0/0xd54 kernel/softirq.c:600 softirqs last disabled at (63631): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 CPU: 0 PID: 12938 Comm: syz-executor.4 Not tainted 6.4.0-rc3-syzkaller-geb0f1697d729 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __sanitizer_cov_trace_const_cmp4+0x8c/0x98 kernel/kcov.c:306 lr : fq_pie_qdisc_dequeue+0x120/0x8ac net/sched/sch_fq_pie.c:246 sp : ffff800008007200 x29: ffff800008007280 x28: ffff00012f385d10 x27: ffff0000d05d8ae8 x26: ffff0000d05d8af0 x25: dfff800000000000 x24: ffff0000d05d8ae0 x23: ffff00012f385d00 x22: 0000000000000040 x21: 1fffe00025e70ba0 x20: ffff0000d05d8ae0 x19: 0000000000000000 x18: dfff800000000000 x17: 0000000000000000 x16: ffff80000850b36c x15: 0000000000000302 x14: 0000000000000100 x13: 0000000000000000 x12: 0000000000000001 x11: 0000000000000302 x10: 0000000000000100 x9 : 0000000000000000 x8 : ffff0000dae25340 x7 : ffff80000841c468 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000d05d8ae0 x1 : 0000000000000000 x0 : 0000000000000001 Call trace: write_comp_data kernel/kcov.c:259 [inline] __sanitizer_cov_trace_const_cmp4+0x8c/0x98 kernel/kcov.c:304 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1fc/0x231c net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3868 [inline] __dev_queue_xmit+0xc80/0x3318 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_connected_output+0x2f8/0x38c net/core/neighbour.c:1581 neigh_output include/net/neighbour.h:544 [inline] ip6_finish_output2+0xd60/0x1a1c 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:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:587 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:33 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:55 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irq+0x34/0x80 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:400 [inline] shmem_add_to_page_cache+0x824/0x117c mm/shmem.c:746 shmem_get_folio_gfp+0x1318/0x22ec mm/shmem.c:1978 shmem_get_folio mm/shmem.c:2079 [inline] shmem_write_begin+0x13c/0x4d8 mm/shmem.c:2573 generic_perform_write+0x278/0x55c mm/filemap.c:3923 __generic_file_write_iter+0x168/0x388 mm/filemap.c:4051 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:4083 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x618/0x918 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591