rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (0 ticks this GP) idle=c1d/1/0x4000000000000000 softirq=7168/7168 fqs=2100 (detected by 1, t=10506 jiffies, g=8073, q=395) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 154 Comm: kworker/u4:2 Not tainted 5.15.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: netns cleanup_net RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:56 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x4b/0x290 mm/kasan/generic.c:189 Code: e8 2f 41 81 f8 ff ff 01 00 0f 82 43 02 00 00 49 bf 01 00 00 00 00 fc ff df 49 89 fb 49 c1 eb 03 49 b8 00 00 00 00 00 fc ff df <4f> 8d 0c 03 48 8d 5c 37 ff 48 c1 eb 03 4e 8d 14 3b 4d 89 d6 4d 29 RSP: 0018:ffffc90000007800 EFLAGS: 00000806 RAX: 0000000000000001 RBX: ffff88801ba6bb80 RCX: ffffffff815c9be4 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ff9b0c0 RBP: 0000000000000008 R08: dffffc0000000000 R09: fffffbfff1ff3619 R10: fffffbfff1ff3619 R11: 1ffffffff1ff3618 R12: 0000000000000100 R13: dffffc0000000000 R14: ffff88801ba6c760 R15: dffffc0000000001 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fccba18ed58 CR3: 0000000073976000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hlock_class kernel/locking/lockdep.c:197 [inline] mark_lock+0x94/0x320 kernel/locking/lockdep.c:4569 mark_usage kernel/locking/lockdep.c:4512 [inline] __lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162 debug_object_activate+0x65/0x480 lib/debugobjects.c:694 debug_hrtimer_activate kernel/time/hrtimer.c:410 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1074 __run_hrtimer kernel/time/hrtimer.c:1707 [inline] __hrtimer_run_queues+0x65a/0xc40 kernel/time/hrtimer.c:1754 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:finish_lock_switch+0x134/0x280 kernel/sched/core.c:4785 Code: be ff ff ff ff e8 fc ce 4d 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 e6 2a 57 08 e8 11 7f 2a 00 fb 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 99 10 fe ff 43 80 3c RSP: 0018:ffffc90002046da8 EFLAGS: 00000282 RAX: 7bc4c24f11f8b500 RBX: ffff8880b903a300 RCX: 7bc4c24f11f8b500 RDX: dffffc0000000000 RSI: ffffffff8a0b11c0 RDI: ffffffff8a59a700 RBP: 1ffff1101720760b R08: dffffc0000000000 R09: fffffbfff1ff361a R10: fffffbfff1ff361a R11: 1ffffffff1ff3619 R12: 1ffff110172075b9 R13: dffffc0000000000 R14: ffff8880b903adc8 R15: 0000000000000000 finish_task_switch+0x12f/0x640 kernel/sched/core.c:4902 context_switch kernel/sched/core.c:5033 [inline] __schedule+0x11c0/0x43b0 kernel/sched/core.c:6376 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6552 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6577 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 unwind_next_frame+0x12ac/0x1d90 arch/x86/kernel/unwind_orc.c:616 __unwind_start+0x5bb/0x740 arch/x86/kernel/unwind_orc.c:704 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3515 kernfs_put+0x319/0x490 fs/kernfs/dir.c:547 kernfs_remove_by_name_ns+0x99/0x100 fs/kernfs/dir.c:1567 kernfs_remove_by_name include/linux/kernfs.h:598 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf8/0x290 fs/sysfs/group.c:289 sysfs_remove_groups+0x50/0xa0 fs/sysfs/group.c:313 device_remove_groups drivers/base/core.c:2498 [inline] device_remove_attrs+0xc2/0x140 drivers/base/core.c:2698 device_del+0x620/0xa70 drivers/base/core.c:3599 unregister_netdevice_many+0x141e/0x18f0 net/core/dev.c:11161 ip6gre_exit_batch_net+0x445/0x490 net/ipv6/ip6_gre.c:1650 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x77b/0xb80 net/core/net_namespace.c:635 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287