rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10504 ticks this GP) idle=69e4/1/0x4000000000000000 softirq=19376/19378 fqs=4529
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1040949          0            0
rcu: 	cputime:    23882      28607           75   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=11813 q=1885 ncpus=2)
CPU: 1 UID: 0 PID: 6905 Comm: syz.1.276 Not tainted 6.16.0-syzkaller-06600-g1dbf1d590d10 #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:rcu_read_unlock_special+0x87/0x4c0
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 b2 e8 f2 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e0c60 EFLAGS: 00000206
RAX: 738f054e7ebfb500 RBX: 1ffff9200003c194 RCX: 738f054e7ebfb500
RDX: 0000000000000002 RSI: ffffffff8d9792e3 RDI: ffffffff8be30a00
RBP: ffffc900001e0d48 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: fffffbfff1f40f7f R12: ffffffff8e141800
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007fae6edae6c0(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000d2d000 CR3: 0000000110546000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 sched_balance_domains+0x8be/0x9e0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
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 6a 20 2b f6 48 89 df e8 c2 b7 2b f6 e8 ad dc 54 f6 fb bf 01 00 00 00 <e8> 72 b5 1d f6 65 8b 05 6b 9f 27 07 85 c0 74 07 5b e9 51 4c 00 00
RSP: 0018:ffffc90007417730 EFLAGS: 00000286
RAX: 738f054e7ebfb500 RBX: ffff88803a0ecb80 RCX: 738f054e7ebfb500
RDX: 0000000000000006 RSI: ffffffff8d9792e3 RDI: 0000000000000001
RBP: ffffc90007417870 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: fffffbfff1f40f7f R12: ffffc900074177c0
R13: 0000000000000cc0 R14: 0000000000000cc0 R15: 00000003fffffffc
 shmem_add_to_page_cache+0x863/0xb10
 shmem_alloc_and_add_folio+0x846/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae6df8ebe9
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:00007fae6edae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fae6e1b6090 RCX: 00007fae6df8ebe9
RDX: 00000000fffffd26 RSI: 0000200000000000 RDI: 000000000000000e
RBP: 00007fae6e011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fae6e1b6128 R14: 00007fae6e1b6090 R15: 00007fff181ecb08
 </TASK>
sched: DL replenish lagged too much
