=============================
WARNING: suspicious RCU usage
6.9.0-rc5-next-20240426-syzkaller #0 Not tainted
-----------------------------
kernel/rcu/tree.c:276 Illegal rcu_softirq_qs() in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by ksoftirqd/1/24:
 #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:933 [inline]
 #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2022 [inline]
 #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x183/0x520 arch/x86/mm/physaddr.c:65

stack backtrace:
CPU: 1 PID: 24 Comm: ksoftirqd/1 Not tainted 6.9.0-rc5-next-20240426-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712
 rcu_softirq_qs+0xd9/0x370 kernel/rcu/tree.c:273
 __do_softirq+0x5fd/0x980 kernel/softirq.c:568
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__virt_addr_valid+0x322/0x520 arch/x86/mm/physaddr.c:65
Code: 1c 45 0a 89 c3 31 ff 89 c6 e8 5a 18 54 00 85 db 74 75 80 3d a9 9e 54 0e 01 75 73 e8 08 14 54 00 e9 8d 00 00 00 e8 fe 13 54 00 <bb> 01 00 00 00 e8 a4 1c 45 0a 89 c5 31 ff 89 c6 e8 29 18 54 00 85
RSP: 0018:ffffc900001e7a58 EFLAGS: 00000293
RAX: ffffffff81424132 RBX: 0000000000000008 RCX: ffff8880176f0000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff814240a3 R09: 1ffffffff25f2cb0
R10: dffffc0000000000 R11: fffffbfff25f2cb1 R12: 000000005478d378
R13: 1ffff9200003cf64 R14: ffffffff81423f93 R15: ffff88813fff9140
 kasan_addr_to_slab+0xd/0x80 mm/kasan/common.c:37
 __kasan_record_aux_stack+0x11/0xc0 mm/kasan/generic.c:526
 __call_rcu_common kernel/rcu/tree.c:3103 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3207
 context_switch kernel/sched/core.c:5411 [inline]
 __schedule+0x17f0/0x4a50 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 smpboot_thread_fn+0x61e/0xa30 kernel/smpboot.c:160
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	89 c3                	mov    %eax,%ebx
   2:	31 ff                	xor    %edi,%edi
   4:	89 c6                	mov    %eax,%esi
   6:	e8 5a 18 54 00       	call   0x541865
   b:	85 db                	test   %ebx,%ebx
   d:	74 75                	je     0x84
   f:	80 3d a9 9e 54 0e 01 	cmpb   $0x1,0xe549ea9(%rip)        # 0xe549ebf
  16:	75 73                	jne    0x8b
  18:	e8 08 14 54 00       	call   0x541425
  1d:	e9 8d 00 00 00       	jmp    0xaf
  22:	e8 fe 13 54 00       	call   0x541425
* 27:	bb 01 00 00 00       	mov    $0x1,%ebx <-- trapping instruction
  2c:	e8 a4 1c 45 0a       	call   0xa451cd5
  31:	89 c5                	mov    %eax,%ebp
  33:	31 ff                	xor    %edi,%edi
  35:	89 c6                	mov    %eax,%esi
  37:	e8 29 18 54 00       	call   0x541865
  3c:	85                   	.byte 0x85