=============================
WARNING: suspicious RCU usage
5.12.0-rc5-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:8294 Illegal context switch in RCU-bh read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
1 lock held by iou-sqp-13544/13545:
 #0: ffff888019f13470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread+0xff2/0x13a0 fs/io_uring.c:6794

stack backtrace:
CPU: 0 PID: 13545 Comm: iou-sqp-13544 Not tainted 5.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 ___might_sleep+0x229/0x2c0 kernel/sched/core.c:8294
 io_sq_thread+0xbae/0x13a0 fs/io_uring.c:6768
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294