watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.7.352:7645] Modules linked in: irq event stamp: 17811345 hardirqs last enabled at (17811344): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (17811344): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:550 [inline] hardirqs last enabled at (17811344): [] irqentry_exit+0x218/0x730 kernel/entry/common.c:164 hardirqs last disabled at (17811345): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (22412): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (22412): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (22412): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 softirqs last disabled at (22415): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (22415): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (22415): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 7645 Comm: syz.7.352 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:300 [inline] RIP: 0010:rcu_read_lock include/linux/rcupdate.h:838 [inline] RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1181 [inline] RIP: 0010:unwind_next_frame+0xaf/0x2550 arch/x86/kernel/unwind_orc.c:495 Code: 0f 84 4e 02 00 00 89 84 24 8c 00 00 00 4c 89 bc 24 90 00 00 00 e8 31 96 34 00 4c 8d 3d 00 00 00 00 48 c7 c7 e0 cc 95 8e 31 f6 <31> d2 b9 02 00 00 00 45 31 c0 45 31 c9 41 57 e8 ed b8 2a 00 48 83 RSP: 0018:ffffc90000a08398 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff818a8f64 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff8e95cce0 RBP: dffffc0000000000 R08: ffffc90000a08530 R09: 000000000000001e R10: ffffc90000a084b8 R11: ffffffff81b0f500 R12: ffffc90000a084a0 R13: 1ffff9200014108d R14: ffffc90000a08468 R15: ffffffff81770256 FS: 00007fde6c5c66c0(0000) GS:ffff888125322000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555721c84e8 CR3: 0000000033820000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: 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:2689 [inline] slab_free mm/slub.c:6246 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6373 kfree_skb_reason include/linux/skbuff.h:1322 [inline] __netif_receive_skb_core+0x2c10/0x3170 net/core/dev.c:6183 __netif_receive_skb_list_core+0x24d/0x810 net/core/dev.c:6284 __netif_receive_skb_list net/core/dev.c:6351 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6442 netif_receive_skb_list+0x55/0x450 net/core/dev.c:6494 ieee80211_rx_napi+0x35d/0x3e0 net/mac80211/rx.c:5663 ieee80211_rx include/net/mac80211.h:5395 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:938 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__schedule+0x17bc/0x5680 kernel/sched/core.c:7148 Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 ba 65 79 f6 4c 89 23 4c 89 ef 4c 89 e6 e8 2c 5c 7c f5 48 89 c7 e8 d4 f8 dd f5 <31> ff 4d 39 e5 40 0f 95 c7 e8 b6 04 de f5 48 8b 84 24 00 01 00 00 RSP: 0018:ffffc9000554f540 EFLAGS: 00000202 RAX: 0000000000004815 RBX: ffff8880b873ae48 RCX: 0000000080000001 RDX: 0000000000000007 RSI: ffffffff8dfd255a RDI: ffffffff8c2891e0 RBP: ffffc9000554f758 R08: ffffffff903338f7 R09: 1ffffffff206671e R10: dffffc0000000000 R11: fffffbfff206671f R12: ffff88802c8e9ec0 R13: ffff88802c8e9ec0 R14: dffffc0000000000 R15: ffff8880b873b9b8 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7369 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:198 __debug_check_no_obj_freed lib/debugobjects.c:1125 [inline] debug_check_no_obj_freed+0x52e/0x550 lib/debugobjects.c:1146 __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0x593/0xd30 mm/page_alloc.c:2935 __slab_free+0x274/0x2c0 mm/slub.c:5608 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4905 taskstats_tgid_alloc kernel/taskstats.c:576 [inline] taskstats_exit+0x14a/0xa70 kernel/taskstats.c:615 do_exit+0x682/0x22c0 kernel/exit.c:945 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117 get_signal+0x1284/0x1330 kernel/signal.c:3037 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fde6b79cdd9 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:00007fde6c5c60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fde6ba15fa8 RCX: 00007fde6b79cdd9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fde6ba15fa8 RBP: 00007fde6ba15fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fde6ba16038 R14: 00007ffdbf129820 R15: 00007ffdbf129908 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:sched_clock_cpu+0x74/0x440 kernel/sched/clock.c:400 Code: 05 f7 8d 48 c7 44 24 50 f0 06 9e 81 4c 8d 7c 24 40 49 c1 ef 03 48 b8 f1 f1 f1 f1 f8 f3 f3 f3 4b 89 04 2f 66 90 e8 dc 94 cd ff <48> 03 05 ed 31 95 0e 48 c7 44 24 40 0e 36 e0 45 4b c7 04 2f 00 00 RSP: 0018:ffffc90000147bc0 EFLAGS: 00000046 RAX: 00000052d880ff51 RBX: ffff8880b86243d8 RCX: ffff88801daa9ec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffffc90000147c90 R08: ffffffff903338f7 R09: 1ffffffff206671e R10: dffffc0000000000 R11: fffffbfff206671f R12: ffff88801daa9ed8 R13: dffffc0000000000 R14: ffffc90000147c20 R15: 1ffff92000028f80 FS: 0000000000000000(0000) GS:ffff888125222000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055943572b848 CR3: 000000007f2c2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irqtime_account_irq+0x65/0x1b0 kernel/sched/cputime.c:68 account_softirq_enter include/linux/vtime.h:136 [inline] handle_softirqs+0x110/0x840 kernel/softirq.c:600 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245