=============================
WARNING: suspicious RCU usage
5.12.0-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:4912 Illegal context switch in RCU-sched read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
no locks held by syz-executor.1/17802.

stack backtrace:
CPU: 1 PID: 17802 Comm: syz-executor.1 Not tainted 5.12.0-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
 schedule_debug kernel/sched/core.c:4912 [inline]
 __schedule+0x1647/0x2410 kernel/sched/core.c:5038
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 freezable_schedule include/linux/freezer.h:172 [inline]
 futex_wait_queue_me+0x2a7/0x570 kernel/futex.c:2606
 futex_wait+0x1db/0x5f0 kernel/futex.c:2708
 do_futex+0x15d/0x1780 kernel/futex.c:3733
 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3796
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd96206198 EFLAGS: 00000246
 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000032 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c014
RBP: 000000000056c014 R08: 00007ffd9630c090 R09: 0000000000000000
R10: 00007ffd96206270 R11: 0000000000000246 R12: 00000000000596c9
R13: 00000000000003e8 R14: 000000000056bf60 R15: 000000000005967b