watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.5.5441:26576] Modules linked in: irq event stamp: 13015385 hardirqs last enabled at (13015384): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (13015385): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (12441694): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (12441694): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (12441694): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (12441699): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (12441699): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (12441699): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 26576 Comm: syz.5.5441 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:get_stack_info+0x6/0xf0 arch/x86/kernel/dumpstack_64.c:193 Code: d0 fc f7 09 cc 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 41 57 <41> 56 41 55 41 54 53 48 89 cb 49 89 d6 49 89 f7 48 85 f6 74 07 48 RSP: 0018:ffffc90000a08498 EFLAGS: 00000246 RAX: 1ffff920001410a8 RBX: ffffc90000a08508 RCX: ffffc90000a08528 RDX: ffffc90000a08508 RSI: ffff88802a880000 RDI: ffffc90000a084a8 RBP: ffffc90000a08501 R08: ffffc90000a08567 R09: 0000000000000000 R10: ffffc90000a08508 R11: fffff520001410ad R12: ffffc90000a084a8 R13: ffffc90000a08528 R14: ffffc90000a08530 R15: 1ffff920001410a6 FS: 00007feb5cecf6c0(0000) GS:ffff888125f32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feb5ceaed58 CR3: 000000008e3e8000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __unwind_start+0x43f/0x760 arch/x86/kernel/unwind_orc.c:742 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 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 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x43c/0x720 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x27e/0x430 net/core/skbuff.c:690 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 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:rcu_read_unlock_special+0x87/0x520 kernel/rcu/tree_plugin.h:770 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 02 8a d6 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc9000b787160 EFLAGS: 00000206 RAX: 281ac68c9f377600 RBX: 1ffff920016f0e30 RCX: 281ac68c9f377600 RDX: 0000000000000000 RSI: ffffffff8d792e98 RDI: ffffffff8bc086e0 RBP: ffffc9000b787238 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: 0000000000000246 R13: dffffc0000000000 R14: 0000000000000002 R15: ffff8880b873b800 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1ab6/0x23d0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 class_preempt_destructor include/linux/preempt.h:468 [inline] try_to_wake_up+0x82b/0x12b0 kernel/sched/core.c:4225 wake_up_process kernel/sched/core.c:4349 [inline] wake_up_q+0x85/0xd0 kernel/sched/core.c:1087 futex_wake+0x4a0/0x560 kernel/futex/waitwake.c:198 do_futex+0x395/0x420 kernel/futex/syscalls.c:135 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:188 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: 0033:0x7feb5bf8f749 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:00007feb5cecf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007feb5c1e5fa8 RCX: 00007feb5bf8f749 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007feb5c1e5fac RBP: 00007feb5c1e5fa0 R08: 3fffffffffffffff R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007feb5c1e6038 R14: 00007ffdc7494b00 R15: 00007ffdc7494be8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 26575 Comm: syz.8.5437 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:trace_hardirqs_off+0x24/0x40 kernel/trace/trace_preemptirq.c:107 Code: 90 90 90 90 90 90 f3 0f 1e fa 53 48 8b 5c 24 08 48 89 df e8 6e 88 92 09 65 8b 05 57 66 b6 10 85 c0 74 07 5b c3 cc cc cc cc cc <65> c7 05 41 66 b6 10 01 00 00 00 48 89 df 5b e9 b8 fe ff ff 0f 1f RSP: 0018:ffffc90000007870 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff81af676a RCX: dd8e5abaadab0600 RDX: 0000000000000100 RSI: ffffffff8d792e98 RDI: ffffffff8bc086e0 RBP: ffffc90000007928 R08: ffff888032250000 R09: 0000000000000002 R10: 0000000000000080 R11: 0000000000000100 R12: dffffc0000000000 R13: 0000000000000200 R14: dffffc0000000000 R15: 1ffff92000000f10 FS: 00007fd95f0116c0(0000) GS:ffff888125e32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555562b495c8 CR3: 0000000053d56000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: seqcount_lockdep_reader_access+0xea/0x1c0 include/linux/seqlock.h:71 ktime_get_with_offset+0x93/0x2a0 kernel/time/timekeeping.c:867 ktime_get_boottime include/linux/timekeeping.h:106 [inline] ktime_get_boottime_ns include/linux/timekeeping.h:195 [inline] mac80211_hwsim_tx_frame_no_nl+0x6b1/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1835 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858 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:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1571 Code: cc e8 d1 e4 c8 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 66 90 e8 04 82 cb 09 e8 3f 5d 36 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc cc f3 0f 1e fa 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9000b496d08 EFLAGS: 00000286 RAX: dd8e5abaadab0600 RBX: ffff8880b863a900 RCX: dd8e5abaadab0600 RDX: 0000000000000000 RSI: ffffffff8d792e98 RDI: ffffffff8bc086e0 RBP: ffffc9000b496f30 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: dffffc0000000000 R13: ffff888032250000 R14: ffff8880b863b470 R15: 1ffff110170c7680 __schedule+0x19cf/0x5000 kernel/sched/core.c:6871 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:filter_irq_stacks+0x68/0xa0 kernel/stacktrace.c:397 Code: 04 de 48 3d 30 02 00 81 0f 93 c1 48 3d 70 16 00 81 0f 92 c2 84 d1 75 27 48 3d 50 ef 5e 8b 0f 92 c1 48 3d 6b ef 5e 8b 0f 93 c0 <08> c8 74 11 48 ff c3 49 83 c7 08 49 39 dc 75 ae 44 89 e3 eb 06 ff RSP: 0018:ffffc9000b497108 EFLAGS: 00000297 RAX: ffffffff81000100 RBX: 000000000000000c RCX: 0000000000000001 RDX: 0000000000000001 RSI: 000000000000000d RDI: ffffc9000b4971a0 RBP: ffffc9000b4973c8 R08: ffffffff81d0ef46 R09: ffffffff8df41a20 R10: ffffc9000b4970b8 R11: ffffffff81ada100 R12: 000000000000000d R13: dffffc0000000000 R14: ffffc9000b4971a0 R15: ffffc9000b497200 stack_depot_save_flags+0x40/0x850 lib/stackdepot.c:659 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kfree+0x1c0/0x660 mm/slub.c:6876 vfree+0x353/0x400 mm/vmalloc.c:3471 bpf_prog_calc_tag+0x315/0x370 kernel/bpf/core.c:334 resolve_pseudo_ldimm64+0xbc/0xc30 kernel/bpf/verifier.c:21044 bpf_check+0x1cf9/0x1c300 kernel/bpf/verifier.c:25217 bpf_prog_load+0x13ba/0x1a10 kernel/bpf/syscall.c:3086 __sys_bpf+0x5c3/0x8a0 kernel/bpf/syscall.c:6205 __do_sys_bpf kernel/bpf/syscall.c:6318 [inline] __se_sys_bpf kernel/bpf/syscall.c:6316 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6316 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: 0033:0x7fd95e18f749 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:00007fd95f011038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd95e3e5fa0 RCX: 00007fd95e18f749 RDX: 0000000000000094 RSI: 00002000000018c0 RDI: 0000000000000005 RBP: 00007fd95e213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd95e3e6038 R14: 00007fd95e3e5fa0 R15: 00007ffe35f32908