rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=159c/1/0x4000000000000000 softirq=56523/56524 fqs=4484
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   995800          0            0
rcu: 	cputime:    25046      27443           95   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=18093 q=2223 ncpus=2)
CPU: 0 UID: 0 PID: 8450 Comm: syz.1.663 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:ffffc900000075c0 EFLAGS: 00000206
RAX: 85f2b9dab3ab9200 RBX: 1ffff92000000ec0 RCX: 85f2b9dab3ab9200
RDX: 0000000000000000 RSI: ffffffff8d9792e3 RDI: ffffffff8be30a00
RBP: ffffc900000076b8 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: fffffbfff1f40f7f R12: ffffffff8e141800
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f89cf9f66c0(0000) GS:ffff8880b8680000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555561264808 CR3: 000000010e28c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 shmem_free_in_core_inode+0x73/0xb0
 rcu_core+0xca8/0x1710
 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:fd_install+0x145/0x540
Code: 4e 0d 01 48 c7 c7 00 84 99 8b be a6 03 00 00 48 c7 c2 40 84 99 8b e8 ba e1 61 ff 4d 8d 67 04 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 c6 03 00 00 41 80 3c 24 01 0f 84 07 02 00 00 49 83 c7
RSP: 0018:ffffc90008257e18 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888040813980
RDX: 0000000000000000 RSI: ffffffff8be309e0 RDI: ffffffff8be309a0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff823bb8c7
R10: ffff888100aba820 R11: ffff88811a515318 R12: ffff888020118404
R13: 0000000000000013 R14: ffffffff823bb8c7 R15: ffff888020118400
 __sys_socketpair+0x49e/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89d178ebe9
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:00007f89cf9f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f89d19b5fa0 RCX: 00007f89d178ebe9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 00007f89d1811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000001480 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f89d19b6038 R14: 00007f89d19b5fa0 R15: 00007ffffd31c368
 </TASK>
