rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7110/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=20501, q=971637 ncpus=2)
task:syz.2.316       state:R  running task     stack:25000 pid:7110  tgid:7109  ppid:6978   task_flags:0x40044c flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x49/0x3e0 kernel/locking/lockdep.c:5877
Code: 65 48 8b 03 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 c0 90 c9 11 83 f8 08 0f 83 93 02 00 00 89 c0 48 0f a3 05 e9 d0 c0 0e 73 16 <e8> 82 b5 09 00 84 c0 75 0d f6 05 4d b7 aa 0e 01 0f 84 b1 02 00 00
RSP: 0018:ffffc900045af200 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff9368a020 RCX: ffff88802bbe8000
RDX: 0000000000000000 RSI: ffffffff816e0bc8 RDI: ffffffff8ed3dfe0
RBP: ffffffff816e0bc8 R08: ffffc900045af39f R09: 0000000000000000
R10: ffffc900045af390 R11: fffff520008b5e74 R12: ffffc900045af350
R13: dffffc0000000000 R14: ffffc900045af728 R15: ffffffff8ed3dfe0
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x1a9f/0x23b0 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548
 slab_free_hook mm/slub.c:2350 [inline]
 slab_free mm/slub.c:4646 [inline]
 kmem_cache_free+0x2ff/0x410 mm/slub.c:4748
 exit_mmap+0x73e/0xde0 mm/mmap.c:1309
 __mmput+0x115/0x420 kernel/fork.c:1379
 exit_mm+0x221/0x310 kernel/exit.c:589
 do_exit+0x994/0x27f0 kernel/exit.c:940
 do_group_exit+0x207/0x2c0 kernel/exit.c:1102
 get_signal+0x1696/0x1730 kernel/signal.c:3034
 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd5d38d169
RSP: 002b:00007fcd5e1610e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fcd5d5a5fa8 RCX: 00007fcd5d38d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcd5d5a5fa8
RBP: 00007fcd5d5a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd5d5a5fac
R13: 0000000000000000 R14: 00007fcd5d6cf940 R15: 00007fcd5d6cfa28
 </TASK>