syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=e51/1/0x4000000000000000 softirq=6960/6961 fqs=5249 
	(detected by 1, t=10502 jiffies, g=7445, q=295)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4405 Comm: syz.0.28 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:apic_eoi arch/x86/include/asm/apic.h:400 [inline]
RIP: 0010:ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline]
RIP: 0010:__sysvec_irq_work+0x2b/0x240 arch/x86/kernel/irq_work.c:19
Code: 56 53 49 be 00 00 00 00 00 fc ff df 48 c7 c0 e8 0b bc 8b 48 c1 e8 03 42 80 3c 30 00 74 0c 48 c7 c7 e8 0b bc 8b e8 c5 e4 91 00 <48> 8b 1d f6 bb 91 0a 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48
RSP: 0018:ffffc90000007968 EFLAGS: 00000046
RAX: 1ffffffff177817d RBX: ffffc90000007998 RCX: 0dd44cd7bb56f000
RDX: 1ffffffff1dd7e00 RSI: ffffffff8a59e7e0 RDI: ffffffff8a59e7a0
RBP: 0000000000000000 R08: ffffffff8eebf008 R09: ffffffff8eebf018
R10: ffffffff8eebf010 R11: ffffffff8eebf003 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f62f20ce6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32963fff CR3: 0000000079ebb000 CR4: 00000000003506f0
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+0x4a/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
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 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007a40 EFLAGS: 00000206
RAX: 0dd44cd7bb56f000 RBX: 1ffff92000000f4c RCX: 0dd44cd7bb56f000
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc90000007b08 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 atomic_notifier_call_chain+0x254/0x280 kernel/notifier.c:199
 profile_handoff_task+0x1a/0x40 kernel/profile.c:143
 __put_task_struct+0x2d1/0x480 kernel/fork.c:763
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x962/0x15d0 kernel/rcu/tree.c:2763
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:91 [inline]
RIP: 0010:lock_acquire+0x11f/0x3f0 kernel/locking/lockdep.c:5599
Code: 84 ef 00 00 00 65 8b 05 4f 7e a6 7e 85 c0 0f 85 2d 01 00 00 65 4c 8b 35 bf 74 a6 7e 49 81 c6 ec 0a 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 f2 01 00 00 41 83 3e 00 0f 85 00 01 00
RSP: 0018:ffffc9000349fa60 EFLAGS: 00000a03
RAX: 1ffff1100f4838cd RBX: 0000000000000000 RCX: 0dd44cd7bb56f000
RDX: 0000000000000000 RSI: ffffffff8a59e7e0 RDI: ffffffff8a59e7a0
RBP: ffffc9000349fb78 R08: dffffc0000000000 R09: fffffbfff1ad26b6
R10: fffffbfff1ad26b6 R11: 1ffffffff1ad26b5 R12: ffffc90000e0a620
R13: 1ffff92000693f58 R14: ffff88807a41c66c R15: dffffc0000000000
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 futex_wake+0x213/0x530 kernel/futex/core.c:1682
 do_futex+0xcde/0x1240 kernel/futex/core.c:3987
 __do_sys_futex kernel/futex/core.c:4059 [inline]
 __se_sys_futex+0x3a3/0x430 kernel/futex/core.c:4040
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f62f2a5f749
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:00007f62f20ce0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f62f2cb5fa8 RCX: 00007f62f2a5f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f62f2cb5fac
RBP: 00007f62f2cb5fa0 R08: 0028dfb4e85bc328 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f62f2cb6038 R14: 00007ffc6742f930 R15: 00007ffc6742fa18
 </TASK>