syzbot

=============================
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:valid_section include/linux/mmzone.h:1925 [inline]
RIP: 0010:pfn_valid include/linux/mmzone.h:2023 [inline]
RIP: 0010:__virt_addr_valid+0x22e/0x520 arch/x86/mm/physaddr.c:65
Code: 0e 01 48 c7 c7 e0 61 c8 8b be a7 03 00 00 48 c7 c2 20 62 c8 8b e8 02 c7 30 00 4d 85 ff 74 36 4c 89 f8 48 c1 e8 03 80 3c 28 00 <74> 08 4c 89 ff e8 78 c9 b9 00 49 8b 1f 48 89 de 48 83 e6 02 31 ff
RSP: 0018:ffffc900001e7998 EFLAGS: 00000246
RAX: 1ffff11027fff23c RBX: 0000000000000001 RCX: ffff8880176f0000
RDX: 0000000000000000 RSI: ffffffff8c1fc4c0 RDI: ffffffff8c1fc480
RBP: dffffc0000000000 R08: ffffffff81423fc4 R09: 1ffffffff25f2cb0
R10: dffffc0000000000 R11: fffffbfff25f2cb1 R12: 000000007da17178
R13: 1ffff9200003cf4c R14: ffffffff81423f93 R15: ffff88813fff91e0
 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
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6924
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6948
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 smpboot_thread_fn+0x65b/0xa30 kernel/smpboot.c:163
 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), 2 bytes skipped:
   0:	48 c7 c7 e0 61 c8 8b 	mov    $0xffffffff8bc861e0,%rdi
   7:	be a7 03 00 00       	mov    $0x3a7,%esi
   c:	48 c7 c2 20 62 c8 8b 	mov    $0xffffffff8bc86220,%rdx
  13:	e8 02 c7 30 00       	call   0x30c71a
  18:	4d 85 ff             	test   %r15,%r15
  1b:	74 36                	je     0x53
  1d:	4c 89 f8             	mov    %r15,%rax
  20:	48 c1 e8 03          	shr    $0x3,%rax
  24:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
* 28:	74 08                	je     0x32 <-- trapping instruction
  2a:	4c 89 ff             	mov    %r15,%rdi
  2d:	e8 78 c9 b9 00       	call   0xb9c9aa
  32:	49 8b 1f             	mov    (%r15),%rbx
  35:	48 89 de             	mov    %rbx,%rsi
  38:	48 83 e6 02          	and    $0x2,%rsi
  3c:	31 ff                	xor    %edi,%edi