syzbot

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BUG: KCSAN: data-race in __percpu_ref_switch_mode / percpu_ref_switch_to_atomic_rcu

write to 0xffff88813ce30b50 of 8 bytes by interrupt on cpu 0:
 percpu_ref_call_confirm_rcu lib/percpu-refcount.c:156 [inline]
 percpu_ref_switch_to_atomic_rcu+0x188/0x360 lib/percpu-refcount.c:205
 rcu_do_batch kernel/rcu/tree.c:2506 [inline]
 rcu_core+0x7f7/0xeb0 kernel/rcu/tree.c:2741
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2754
 __do_softirq+0x158/0x2de kernel/softirq.c:558
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:921
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

read to 0xffff88813ce30b50 of 8 bytes by task 22813 on cpu 1:
 __percpu_ref_switch_mode+0xd9/0x3a0 lib/percpu-refcount.c:275
 percpu_ref_resurrect+0xcb/0x110 lib/percpu-refcount.c:473
 io_refs_resurrect fs/io_uring.c:1274 [inline]
 io_ctx_quiesce+0xe0/0x212 fs/io_uring.c:10928
 __io_uring_register fs/io_uring.c:10956 [inline]
 __do_sys_io_uring_register+0x37f/0xf2e fs/io_uring.c:11094
 __se_sys_io_uring_register fs/io_uring.c:11074 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:11074
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffffff8198b350 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22813 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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