rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=b5bc/1/0x4000000000000000 softirq=20040/29187 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1037416          0            0
rcu: 	cputime:    25312      27186           85   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=10565 q=2764 ncpus=2)
CPU: 0 UID: 0 PID: 7480 Comm: syz.1.711 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 2a 2d f6 48 89 df e8 72 c1 2d f6 e8 dd 92 56 f6 fb bf 01 00 00 00 <e8> 42 c1 1f f6 65 8b 05 1b f9 2e 07 85 c0 74 07 5b e9 81 4c 00 00
RSP: 0018:ffffc90000007c90 EFLAGS: 00000286
RAX: 4f75bee9484a8500 RBX: ffff88804b025940 RCX: 4f75bee9484a8500
RDX: 0000000000000002 RSI: ffffffff8d9986f9 RDI: 0000000000000001
RBP: ffffc90000007e10 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff88804b025940
R13: 1ffff92000000fac R14: ffffffff99e466c0 R15: ffffc90000007d60
FS:  00007f18f9cd26c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18f9cd1fc8 CR3: 000000001f6a2000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_timer_base+0x60a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 5b 22 21 f6 e8 96 f5 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900049a7380 EFLAGS: 00000282
RAX: 4f75bee9484a8500 RBX: 0000000000000000 RCX: 4f75bee9484a8500
RDX: 0000000000000006 RSI: ffffffff8d9986f9 RDI: 0000000000000001
RBP: ffffc900049a7420 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000934e70
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 cb de 01 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900049a74e8 EFLAGS: 00000206
RAX: 4f75bee9484a8500 RBX: 0000000000000000 RCX: 4f75bee9484a8500
RDX: 0000000000000000 RSI: ffffffff8db863da RDI: ffffffff8be29f80
RBP: ffffffff8b6fad11 R08: 0000000000000000 R09: ffffffff8b6fad11
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: ffffffff8dffb0a0 R14: 0000000000000001 R15: 0000000000000246
 schedule+0xb1/0x360
 synchronize_rcu_expedited+0x583/0x730
 synchronize_rcu+0x11a/0x310
 rcu_sync_enter+0x1da/0x310
 percpu_down_write+0x60/0x330
 cgroup_procs_write_start+0x19c/0x610
 __cgroup_procs_write+0x98/0x300
 cgroup_procs_write+0x27/0x50
 cgroup_file_write+0x39e/0x740
 kernfs_fop_write_iter+0x378/0x4f0
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f18f8d8eb69
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:00007f18f9cd2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f18f8fb5fa0 RCX: 00007f18f8d8eb69
RDX: 0000000000000012 RSI: 00002000000005c0 RDI: 0000000000000007
RBP: 00007f18f8e11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f18f8fb5fa0 R15: 00007ffda9949618
 </TASK>
