watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.2:6304] Modules linked in: irq event stamp: 8141 hardirqs last enabled at (8140): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (8140): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (8141): [] __el1_irq arch/arm64/kernel/entry-common.c:470 [inline] hardirqs last disabled at (8141): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (870): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3059): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 CPU: 0 PID: 6304 Comm: syz-executor.2 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: ffff0000f2647530 x27: 0000000000000000 x26: 1fffe0001e4c8b2b x25: 057b714842475b41 x24: 057b714842475b00 x23: ffff0000f2645958 x22: ffff0000f2647400 x21: 057b714842475b5d x20: 0000000000000001 x19: 057b714842475ac1 x18: ffff800080006e40 x17: 0000000000000000 x16: ffff80008050b4cc x15: 000000000001cb31 x14: 1ffff00011bde0ac x13: ffffffff80000040 x12: 0000000080000040 x11: 0000000000000302 x10: 0000000000000100 x9 : 0000000000000000 x8 : ffff0000cf6f9bc0 x7 : 0000000000000000 x6 : ffff8000800072f0 x5 : ffff800080007310 x4 : 057b7147c2475b9d x3 : ffff80008898bde8 x2 : 0000000000000000 x1 : 057b714842475b00 x0 : 057b714842475b5d 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 preempt_count+0x44/0x68 arch/arm64/include/asm/preempt.h:13 check_preemption_disabled+0x38/0xf8 lib/smp_processor_id.c:16 debug_smp_processor_id+0x20/0x2c lib/smp_processor_id.c:60 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x5c/0x18c kernel/rcu/tree.c:695 rcu_read_unlock include/linux/rcupdate.h:802 [inline] percpu_ref_tryget_many include/linux/percpu-refcount.h:250 [inline] percpu_ref_tryget+0x124/0x29c include/linux/percpu-refcount.h:266 css_tryget include/linux/cgroup_refcnt.h:45 [inline] get_mem_cgroup_from_mm+0xfc/0x3dc mm/memcontrol.c:1082 __mem_cgroup_charge+0x24/0xa8 mm/memcontrol.c:7041 mem_cgroup_charge include/linux/memcontrol.h:679 [inline] shmem_add_to_page_cache+0x6fc/0x117c mm/shmem.c:714 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:3929 __generic_file_write_iter+0x168/0x388 mm/filemap.c:4057 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:4089 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+0x138/0x244 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