watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.7.6896:2643] Modules linked in: irq event stamp: 14188961 hardirqs last enabled at (14188960): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (14188961): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (14143240): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14143240): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14143240): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (14143243): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14143243): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14143243): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 2643 Comm: syz.7.6896 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline] RIP: 0010:lock_release+0x5a/0x3a0 kernel/locking/lockdep.c:5881 Code: 11 83 f8 08 0f 83 56 02 00 00 89 c0 48 0f a3 05 ac 88 2f 0e 73 0d e8 55 f4 08 00 84 c0 0f 84 94 02 00 00 83 3d c6 b8 2f 0e 00 <0f> 84 1c 02 00 00 65 8b 05 c9 6a 30 11 85 c0 0f 85 0d 02 00 00 65 RSP: 0018:ffffc90000007270 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8174c0e5 RCX: 0000000000000102 RDX: 0000000000000100 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: dffffc0000000000 R08: ffffc90000006f17 R09: 0000000000000000 R10: ffffc90000006f08 R11: fffff52000000de3 R12: ffffc90004ff7be8 R13: ffffffff8174c0e5 R14: ffffffff8e35a320 R15: ffffffff8e35a320 FS: 00007f8cd45d56c0(0000) GS:ffff888125929000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c37feb3 CR3: 0000000049468000 CR4: 00000000003526f0 DR0: 8000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d1/0x6e0 mm/slub.c:5776 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] ref_tracker_alloc+0x161/0x4d0 lib/ref_tracker.c:271 __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline] netdev_hold include/linux/netdevice.h:4429 [inline] dst_init+0xd9/0x450 net/core/dst.c:52 dst_alloc+0x12a/0x170 net/core/dst.c:93 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3333 ndisc_send_skb+0x42d/0x14e0 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4037 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:end_of_stack include/linux/sched/task_stack.h:33 [inline] RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x15a/0x4fb0 kernel/sched/core.c:6740 Code: 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89 df e8 a9 a6 b0 f6 48 89 5c 24 50 4c 8b 33 49 8d 5e 20 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 7e a6 RSP: 0018:ffffc90004ff79c0 EFLAGS: 00000a02 RAX: 1ffff1100c6497a4 RBX: ffff88806324bd20 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: ffffc90004ff7bc0 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff888125929000 R13: 0000000000000001 R14: ffff88806324bd00 R15: 1ffff110170c7680 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: 8b 3d a4 84 15 0c 48 89 de 5b e9 53 56 5c 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 88 ee 0c 11 65 8b 15 a9 ee 0c 11 81 e2 00 01 ff 00 74 RSP: 0018:ffffc90004ff7cf8 EFLAGS: 00000246 RAX: ffffffff81f4e974 RBX: ffff88806324bd00 RCX: ffffffff8b79f51d RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90004ff7c80 RBP: ffffc90004ff7ee0 R08: ffffc90004ff7c87 R09: 1ffff920009fef90 R10: dffffc0000000000 R11: fffff520009fef91 R12: 1ffff920009fefb0 R13: ffff888076465e38 R14: ffff888076466080 R15: ffff888075d75c00 __do_sys_perf_event_open kernel/events/core.c:13826 [inline] __se_sys_perf_event_open+0x1954/0x1d60 kernel/events/core.c:13462 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8cd639acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8cd45d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f8cd6616090 RCX: 00007f8cd639acb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007f8cd6408bf7 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8cd6616128 R14: 00007f8cd6616090 R15: 00007fffb4f59518 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2562 Comm: syz.1.6886 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:151 [inline] RIP: 0010:lock_acquire+0x12d/0x330 kernel/locking/lockdep.c:5871 Code: 02 00 00 48 83 c4 28 48 c7 c7 7d bf d3 8d e8 7a 8f d9 09 b8 ff ff ff ff 65 0f c1 05 cd 9a 30 11 83 f8 01 0f 85 ae 00 00 00 9c <58> a9 00 02 00 00 0f 85 c1 00 00 00 f7 44 24 08 00 02 00 00 0f 85 RSP: 0018:ffffc90000a07bd8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000010103 RDX: 00000000d2c2fc00 RSI: ffffffff8dd3bf7d RDI: ffffffff8be73e00 RBP: ffffffff81b01145 R08: ffffffff81b01145 R09: ffffffff99def508 R10: 0000000000000003 R11: 0000000000010100 R12: 0000000000000002 R13: ffffffff99def508 R14: 0000000000000001 R15: 0000000000000046 FS: 00007f58fc40a6c0(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb3fa00218 CR3: 00000000a5ec2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:72 ktime_get+0x45/0x200 kernel/time/timekeeping.c:824 clockevents_program_event+0xe8/0x350 kernel/time/clockevents.c:326 hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1916 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x188/0x23c0 arch/x86/kernel/unwind_orc.c:-1 Code: 8d 5e 35 48 89 d8 48 c1 e8 03 48 89 44 24 28 0f b6 04 28 84 c0 0f 85 45 1b 00 00 4c 89 6c 24 48 4c 89 64 24 20 4c 89 7c 24 50 <48> 89 5c 24 18 0f b6 1b 48 8b 44 24 30 80 3c 28 00 4c 8b 7c 24 10 RSP: 0018:ffffc90000a07f38 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000a0803d RCX: 0000000000000104 RDX: 000000008eba6367 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: dffffc0000000000 R08: ffffffff8174c0e5 R09: ffffffff8e35a320 R10: ffffc90000a07b48 R11: ffffffff81ae4550 R12: 1ffff92000141001 R13: ffffc90000a08058 R14: ffffc90000a08008 R15: ffffffff8174c0e5 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x195/0x610 mm/slub.c:6781 arp_process+0xefe/0x17b0 net/ipv4/arp.c:942 NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:6187 [inline] __netif_receive_skb_list_core+0x765/0x810 net/core/dev.c:6229 __netif_receive_skb_list net/core/dev.c:6281 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6372 gro_normal_list include/net/gro.h:524 [inline] gro_normal_one include/net/gro.h:544 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x632/0xc90 net/core/gro.c:633 receive_buf+0xb09/0x1900 drivers/net/virtio_net.c:2675 virtnet_receive_packets drivers/net/virtio_net.c:3023 [inline] virtnet_receive drivers/net/virtio_net.c:3047 [inline] virtnet_poll+0x2193/0x3000 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x320 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x696/0xe30 net/core/dev.c:7883 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:memset_orig+0x30/0xb0 arch/x86/lib/memset_64.S:68 Code: ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 <48> ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 RSP: 0018:ffffc90004d0ef38 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffe8ffffd3b3b0 RCX: 0000000000000004 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffc90004d0efc0 RBP: ffffc90004d0f1a8 R08: ffffc90004d0f0bf R09: 0000000000000000 R10: ffffc90004d0efc0 R11: fffff520009a1e18 R12: ffffc90004d0efc0 R13: 1ffff920009a1df0 R14: ffffe8ffffd9a000 R15: dffffc0000000000 perf_tp_event+0xfc/0x1420 kernel/events/core.c:11057 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11005 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x326/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] page_table_check_set+0x4d7/0x610 mm/page_table_check.c:124 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline] set_ptes include/linux/pgtable.h:292 [inline] __copy_present_ptes mm/memory.c:1102 [inline] copy_present_ptes mm/memory.c:1181 [inline] copy_pte_range mm/memory.c:1304 [inline] copy_pmd_range+0x3a4b/0x7f80 mm/memory.c:1392 copy_pud_range mm/memory.c:1429 [inline] copy_p4d_range mm/memory.c:1453 [inline] copy_page_range+0xb95/0x11b0 mm/memory.c:1535 dup_mmap+0xf70/0x1bb0 mm/mmap.c:1827 dup_mm kernel/fork.c:1529 [inline] copy_mm+0x13b/0x4b0 kernel/fork.c:1581 copy_process+0x166e/0x3980 kernel/fork.c:2221 kernel_clone+0x248/0x870 kernel/fork.c:2651 __do_sys_clone kernel/fork.c:2792 [inline] __se_sys_clone kernel/fork.c:2776 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2776 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f58fb59acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f58fc409fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f58fb815fa0 RCX: 00007f58fb59acb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f58fb608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f58fb816038 R14: 00007f58fb815fa0 R15: 00007ffe9f3ad9b8