=============================
WARNING: suspicious RCU usage
6.9.0-rc4-next-20240418-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: ffffffff8e333ae0 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333ae0 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:933 [inline]
 #0: ffffffff8e333ae0 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2022 [inline]
 #0: ffffffff8e333ae0 (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-rc4-next-20240418-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
 common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:check_preemption_disabled+0x2e/0x120
Code: 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 8c 8e 7d 74 65 8b 05 81 8e 7d 74 a9 ff ff ff 7f 74 26 <65> 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 ce 00 00 00 89 d8
RSP: 0018:ffffc900001e7a00 EFLAGS: 00000206
RAX: 0000000080000003 RBX: 0000000000000001 RCX: ffff8880176f0000
RDX: ffff8880176f0000 RSI: ffffffff8c1f8ba0 RDI: ffffffff8c1f8b60
RBP: 0000000000000001 R08: ffffffff814241f7 R09: 1ffffffff25ef6b4
R10: dffffc0000000000 R11: fffffbfff25ef6b5 R12: 000000002c7d1778
R13: 1ffff9200003cf64 R14: ffffffff81424043 R15: ffff88813fff90a0
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:725
 rcu_read_unlock_sched include/linux/rcupdate.h:952 [inline]
 pfn_valid include/linux/mmzone.h:2032 [inline]
 __virt_addr_valid+0x340/0x520 arch/x86/mm/physaddr.c:65
 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:3102 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3206
 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):
   0:	41 54                	push   %r12
   2:	53                   	push   %rbx
   3:	48 83 ec 10          	sub    $0x10,%rsp
   7:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
   e:	00 00
  10:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  15:	65 8b 1d 8c 8e 7d 74 	mov    %gs:0x747d8e8c(%rip),%ebx        # 0x747d8ea8
  1c:	65 8b 05 81 8e 7d 74 	mov    %gs:0x747d8e81(%rip),%eax        # 0x747d8ea4
  23:	a9 ff ff ff 7f       	test   $0x7fffffff,%eax
  28:	74 26                	je     0x50
* 2a:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax <-- trapping instruction
  31:	00 00
  33:	48 3b 44 24 08       	cmp    0x8(%rsp),%rax
  38:	0f 85 ce 00 00 00    	jne    0x10c
  3e:	89 d8                	mov    %ebx,%eax