rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7232/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=20737, q=1745 ncpus=2)
task:syz.3.441       state:R  running task     stack:24472 pid:7232  tgid:7228  ppid:5847   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6781
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7104
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
RIP: 0010:unwind_next_frame+0xb3f/0x2390 arch/x86/kernel/unwind_orc.c:585
Code: 9c 24 88 00 00 00 49 8d 5c 24 f8 4d 8b 66 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 0f 85 85 13 00 00 <41> 83 3e 00 0f 95 c0 49 39 df 0f 96 c1 20 c1 49 39 dc 0f 97 c0 20
RSP: 0018:ffffc90003c3eb58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90003c3f250 RCX: 1ffff92000787d85
RDX: ffffffff903f3fb8 RSI: 0000000000000002 RDI: ffffffff8be26ee0
RBP: 1ffff92000787d86 R08: 0000000000000001 R09: ffffffff81727e15
R10: ffffc90003c3ec78 R11: ffffffff81acd580 R12: ffffc90003c40000
R13: 1ffff92000787d87 R14: ffffc90003c3ec28 R15: ffffc90003c38000
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
 __call_rcu_common kernel/rcu/tree.c:3090 [inline]
 call_rcu+0x142/0x990 kernel/rcu/tree.c:3210
 __destroy_inode+0x2da/0x670 fs/inode.c:371
 destroy_inode fs/inode.c:394 [inline]
 evict+0x797/0x9c0 fs/inode.c:834
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141
 prune_dcache_sb+0x10e/0x180 fs/dcache.c:1222
 super_cache_scan+0x369/0x4b0 fs/super.c:222
 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437
 shrink_slab+0xd74/0x10d0 mm/shrinker.c:664
 drop_slab_node mm/vmscan.c:442 [inline]
 drop_slab+0x14e/0x290 mm/vmscan.c:460
 drop_caches_sysctl_handler+0xc7/0x170 fs/drop_caches.c:68
 proc_sys_call_handler+0x50c/0x7c0 fs/proc/proc_sysctl.c:601
 iter_file_splice_write+0x93a/0x1000 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1158
 splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1227
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1425 [inline]
 __se_sys_sendfile64+0xd9/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76f7b8e969
RSP: 002b:00007f76f59b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f76f7db6160 RCX: 00007f76f7b8e969
RDX: 0000200000002080 RSI: 0000000000000008 RDI: 0000000000000009
RBP: 00007f76f7c10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000023b R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f76f7db6160 R15: 00007f76f7edfa28
 </TASK>