rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2644 jiffies s: 1701 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4515 Comm: syz.4.56 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:irqtime_account_irq+0x9b/0x1b0 kernel/sched/cputime.c:62
Code: 8d 63 10 4c 89 e0 48 c1 e8 03 80 3c 08 00 74 08 4c 89 e7 e8 c7 c8 73 00 4d 89 fd 4d 2b 2c 24 4d 89 3c 24 65 8b 05 4d da a2 7e <25> 00 ff ff 00 29 e8 a9 00 00 0f 00 0f 84 9b 00 00 00 e8 0e 85 cd
RSP: 0018:ffffc900001e09c8 EFLAGS: 00000006
RAX: 0000000000010103 RBX: ffff8880b8f277b0 RCX: dffffc0000000000
RDX: 1ffffffff1f41608 RSI: ffffffff8fa0b05c RDI: ffffffff8fa0b040
RBP: 0000000000010000 R08: ffffffff8fa0b048 R09: ffffffff8fa0b058
R10: ffffffff8fa0b050 R11: ffffffff8fa0b043 R12: ffff8880b8f277c0
R13: 00000000000010c5 R14: ffff88802aaabb80 R15: 0000001ecedd411e
FS:  00007f936239d6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f935f7f5ff8 CR3: 00000000276a3000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 e2 33 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0ac0 EFLAGS: 00000206
RAX: c5f665cf0c6e6900 RBX: 1ffff9200003c160 RCX: c5f665cf0c6e6900
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0f60
RBP: ffffc900001e0bb0 R08: ffffffff90af624f R09: 1ffffffff215ec49
R10: dffffc0000000000 R11: fffffbfff215ec4a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 0f cc 21 f7 65 8b 05 d0 50 cb 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90004b2ece0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: c5f665cf0c6e6900
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: 0000000000000001
RBP: ffffc90004b2ed68 R08: ffffffff90af624f R09: 1ffffffff215ec49
R10: dffffc0000000000 R11: fffffbfff215ec4a R12: dffffc0000000000
R13: ffff8880239cd850 R14: ffffffff8d1ccad0 R15: 1ffff92000965d9c
 __stack_depot_save+0x421/0x460 lib/stackdepot.c:502
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_set_track+0x60/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
 radix_tree_node_alloc+0x197/0x3a0 lib/radix-tree.c:251
 idr_get_free+0x2af/0xa60 lib/radix-tree.c:1504
 idr_alloc_u32 lib/idr.c:48 [inline]
 idr_alloc_cyclic+0x277/0x5c0 lib/idr.c:127
 __kernfs_new_node+0x135/0x810 fs/kernfs/dir.c:620
 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:690
 kernfs_create_dir_ns+0x40/0x120 fs/kernfs/dir.c:1046
 sysfs_create_dir_ns+0x12c/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:63 [inline]
 kobject_add_internal+0x61c/0xcc0 lib/kobject.c:231
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_init_and_add+0x128/0x190 lib/kobject.c:449
 nfs_netns_client_alloc fs/nfs/sysfs.c:163 [inline]
 nfs_netns_sysfs_setup+0xbf/0x140 fs/nfs/sysfs.c:175
 nfs_net_init+0x203/0x2b0 fs/nfs/inode.c:2436
 ops_init+0x355/0x5f0 net/core/net_namespace.c:138
 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336
 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:508
 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110
 copy_namespaces+0x3b0/0x410 kernel/nsproxy.c:178
 copy_process+0x19c2/0x4030 kernel/fork.c:2359
 kernel_clone+0x24b/0x900 kernel/fork.c:2762
 __do_sys_clone kernel/fork.c:2903 [inline]
 __se_sys_clone kernel/fork.c:2887 [inline]
 __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f936159c799
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:00007f936239cfd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f9361815fa0 RCX: 00007f936159c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000e50c1600
RBP: 00007f9361632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f9361816038 R14: 00007f9361815fa0 R15: 00007ffc567440b8
 </TASK>