watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz.0.498:6384] Modules linked in: irq event stamp: 1036815 hardirqs last enabled at (1036814): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (1036814): [] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] hardirqs last enabled at (1036814): [] timekeeping_get_ns+0x124/0x3b8 kernel/time/timekeeping.c:388 hardirqs last disabled at (1036815): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (1036815): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (1414): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (1414): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (6629): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 CPU: 1 PID: 6384 Comm: syz.0.498 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 42400005 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __sanitizer_cov_trace_cmp4+0xac/0xb0 kernel/kcov.c:288 lr : cake_heapify+0x234/0x530 net/sched/sch_cake.c:1497 sp : ffff800008016fd0 x29: ffff800008016fe0 x28: dfff800000000000 x27: 00000000000198d0 x26: 0000000000001e04 x25: 0000000000000000 x24: ffff000101d7b240 x23: dfff800000000000 x22: 0000000000000f01 x21: 0000000000000000 x20: ffff0000da4c02d0 x19: 0000000000000f01 x18: ffff800011abbcc0 x17: ffff8000181fa000 x16: ffff8000082d22e0 x15: ffff800017cdafc0 x14: ffff0000f7072658 x13: 1ffff00002a180b1 x12: 0000000000ff0100 x11: ff0080000ffc9bb4 x10: 0000000000000000 x9 : ffff0000f7071bc0 x8 : ffff80000ffc9bb4 x7 : ffff8000083b95c4 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __sanitizer_cov_trace_cmp4+0xac/0xb0 kernel/kcov.c:288 cake_drop net/sched/sch_cake.c:1575 [inline] cake_enqueue+0x32dc/0x6670 net/sched/sch_cake.c:1948 qdisc_enqueue include/net/sch_generic.h:816 [inline] netem_dequeue+0xa74/0x107c net/sched/sch_netem.c:737 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1c4/0x1368 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3970 [inline] __dev_queue_xmit+0xc18/0x309c net/core/dev.c:4312 dev_queue_xmit include/linux/netdevice.h:3051 [inline] tipc_l2_send_msg+0x29c/0x35c net/tipc/bearer.c:518 tipc_bearer_xmit_skb+0x244/0x384 net/tipc/bearer.c:577 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:477 [inline] __irq_exit_rcu+0x23c/0x43c kernel/softirq.c:679 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 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:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] folio_memcg_lock+0xf8/0x1fc mm/memcontrol.c:2113 lock_page_memcg+0x48/0x58 mm/memcontrol.c:2137 page_add_file_rmap+0x158/0xc40 mm/rmap.c:1293 do_set_pte+0x34c/0x49c mm/memory.c:4424 finish_fault+0x560/0x65c mm/memory.c:4499 do_read_fault mm/memory.c:4635 [inline] do_fault mm/memory.c:4760 [inline] handle_pte_fault mm/memory.c:5031 [inline] __handle_mm_fault mm/memory.c:5173 [inline] handle_mm_fault+0x1ae4/0x2fd4 mm/memory.c:5294 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x338/0x798 mm/gup.c:1250 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607 __mm_populate+0x208/0x330 mm/gup.c:1721 mm_populate include/linux/mm.h:2837 [inline] vm_mmap_pgoff+0x1cc/0x284 mm/util.c:525 ksys_mmap_pgoff+0xd0/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585