watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.5.2438:16449] Modules linked in: irq event stamp: 12654801 hardirqs last enabled at (12654800): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (12654801): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (517764): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (517764): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (517764): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (517769): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (517769): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (517769): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 16449 Comm: syz.5.2438 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x3a/0xb0 kernel/rcu/tree.c:751 Code: e8 ab 32 b4 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 2d 9b 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 ec 72 80 00 48 c7 c3 d8 e6 7f 92 49 03 1e 48 89 RSP: 0018:ffffc900000072b8 EFLAGS: 00000246 RAX: 1ffffffff1b365ba RBX: 0000000000000000 RCX: 48a6f18c93d50a00 RDX: 0000000000000000 RSI: ffffffff8bc08340 RDI: ffffffff8bc08300 RBP: ffffffff81743f85 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000007498 R11: ffffffff81ada120 R12: 0000000000000002 R13: ffffffff8df41a20 R14: ffffffff8d9b2dd0 R15: dffffc0000000000 FS: 00007f89891db6c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000077000 CR3: 000000006a9aa000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x340 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776 kmalloc_noprof include/linux/slab.h:957 [inline] dst_cow_metrics_generic+0x56/0x1c0 net/core/dst.c:193 dst_metrics_write_ptr include/net/dst.h:136 [inline] dst_metric_set include/net/dst.h:197 [inline] icmp6_dst_alloc+0x264/0x420 net/ipv6/route.c:3335 ndisc_send_skb+0x3f1/0x1510 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x6a0 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x19b/0x5000 kernel/sched/core.c:6740 Code: f6 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 8c 7f cb f6 48 81 3b 9d 6e ac 57 <0f> 85 5b 19 00 00 45 85 ed 7f 54 49 8d 5e 18 48 89 d8 48 c1 e8 03 RSP: 0018:ffffc90003fdf380 EFLAGS: 00000246 RAX: 1ffff920007fb000 RBX: ffffc90003fd8000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8bc08340 RDI: ffffffff8bc08300 RBP: ffffc90003fdf590 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff888125e35000 R13: 0000000000000001 R14: ffff88802cc71e80 R15: 1ffff110170c7680 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 49 fa 22 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc90003fdf758 EFLAGS: 00000206 RAX: 48a6f18c93d50a00 RBX: 0000000000000000 RCX: 48a6f18c93d50a00 RDX: 0000000000000000 RSI: ffffffff8d978ff2 RDI: ffffffff8bc08360 RBP: 00000000ffffffff R08: ffffffff82644d4c R09: ffffffff8df41a20 R10: dffffc0000000000 R11: ffffed100f19134b R12: 0000000000000246 R13: ffff88802cc71e80 R14: ffffffff8df41a80 R15: 0000000000000003 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0xa6/0x610 kernel/sched/core.c:8789 down_write+0x76/0x1f0 kernel/locking/rwsem.c:1589 kernfs_add_one+0x41/0x5c0 fs/kernfs/dir.c:794 __kernfs_create_file+0x22b/0x2e0 fs/kernfs/file.c:1086 cgroup_add_file kernel/cgroup/cgroup.c:4421 [inline] cgroup_addrm_files+0x7f2/0xb20 kernel/cgroup/cgroup.c:4475 css_populate_dir+0x2c4/0x3d0 kernel/cgroup/cgroup.c:1812 cgroup_mkdir+0xce6/0xf60 kernel/cgroup/cgroup.c:6019 kernfs_iop_mkdir+0x211/0x350 fs/kernfs/dir.c:1271 vfs_mkdir+0x512/0x5b0 fs/namei.c:5130 do_mkdirat+0x276/0x4b0 fs/namei.c:5164 __do_sys_mkdir fs/namei.c:5191 [inline] __se_sys_mkdir fs/namei.c:5189 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:5189 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f898838f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f89891db038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f89885e5fa0 RCX: 00007f898838f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000 RBP: 00007f8988413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f89885e6038 R14: 00007f89885e5fa0 R15: 00007ffcc000bf08 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 16307 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xccf/0x12b0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 4a 9a 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f5 95 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 d9 95 RSP: 0000:ffffc90004ccf740 EFLAGS: 00000293 RAX: ffffffff81b61c77 RBX: 1ffff110170c856d RCX: ffff8880629c8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004ccf8c0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff8880b8642b68 R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000 FS: 00005555682c9500(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555682e45c8 CR3: 00000000987b8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline] flush_tlb_mm_range+0x6b1/0x1280 arch/x86/mm/tlb.c:1472 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:103 wp_page_copy mm/memory.c:3785 [inline] do_wp_page+0x1bb1/0x5810 mm/memory.c:4180 handle_pte_fault mm/memory.c:6289 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x14c5/0x32b0 mm/memory.c:6580 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f0a5134daaf Code: 8d 34 19 48 39 d5 48 89 75 60 0f 95 c2 48 29 d8 48 83 c1 10 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 51 f8 <48> 89 46 08 eb 80 48 8d 0d 51 00 0f 00 48 8d 15 55 12 0f 00 bf 01 RSP: 002b:00007ffdfd329670 EFLAGS: 00010206 RAX: 0000000000018a41 RBX: 0000000000008040 RCX: 00005555682dc590 RDX: 0000000000008041 RSI: 00005555682e45c0 RDI: 0000000000000004 RBP: 00007f0a515bacc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000802 R12: 0000000000008030 R13: 0000000000000076 R14: 00007f0a515bad20 R15: 0000000000000000