=============================
WARNING: suspicious RCU usage
5.13.0-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:9119 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
no locks held by systemd-udevd/4878.

stack backtrace:
CPU: 0 PID: 4878 Comm: systemd-udevd Not tainted 5.13.0-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_lvl+0xcd/0x134 lib/dump_stack.c:96
 ___might_sleep+0x229/0x2c0 kernel/sched/core.c:9119
 might_alloc include/linux/sched/mm.h:201 [inline]
 slab_pre_alloc_hook mm/slab.h:485 [inline]
 slab_alloc_node mm/slub.c:2891 [inline]
 slab_alloc mm/slub.c:2978 [inline]
 kmem_cache_alloc+0x36a/0x4a0 mm/slub.c:2983
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags fs/namei.c:2734 [inline]
 user_path_at_empty+0xa1/0x100 fs/namei.c:2734
 do_readlinkat+0xcd/0x2f0 fs/stat.c:425
 __do_sys_readlinkat fs/stat.c:452 [inline]
 __se_sys_readlinkat fs/stat.c:449 [inline]
 __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:449
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6f782010ba
Code: 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd499a4418 EFLAGS: 00000202 ORIG_RAX: 000000000000010b
RAX: ffffffffffffffda RBX: 0000561f508088b0 RCX: 00007f6f782010ba
RDX: 0000561f508088b0 RSI: 0000561f508109e0 RDI: 00000000ffffff9c
RBP: 0000000000000064 R08: 0000561f4fc32670 R09: 0000000000000070
R10: 0000000000000063 R11: 0000000000000202 R12: 0000561f508109e0
R13: 00000000ffffff9c R14: 00007ffd499a4470 R15: 0000000000000063