=============================
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:
__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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pfn_valid include/linux/mmzone.h:2023 [inline]
RIP: 0010:__virt_addr_valid+0x23b/0x520 arch/x86/mm/physaddr.c:65
Code: 00 48 c7 c2 20 62 c8 8b e8 32 d2 30 00 4d 85 ff 74 36 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 28 6d b9 00 49 8b 1f <48> 89 de 48 83 e6 02 31 ff e8 67 21 54 00 48 89 d8 48 83 e0 02 75
RSP: 0018:ffffc900001e7a58 EFLAGS: 00000246
RAX: 1ffff11027fff23c RBX: ffffea000000000f RCX: ffff888017af0000
RDX: 0000000000000000 RSI: ffffffff8c1f8ba0 RDI: ffffffff8c1f8b60
RBP: dffffc0000000000 R08: ffffffff81424074 R09: 1ffffffff25ef6b4
R10: dffffc0000000000 R11: fffffbfff25ef6b5 R12: 000000007973b578
R13: 1ffff9200003cf64 R14: ffffffff81424043 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: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
----------------
Code disassembly (best guess):
0: 00 48 c7 add %cl,-0x39(%rax)
3: c2 20 62 ret $0x6220
6: c8 8b e8 32 enter $0xe88b,$0x32
a: d2 30 shlb %cl,(%rax)
c: 00 4d 85 add %cl,-0x7b(%rbp)
f: ff 74 36 4c push 0x4c(%rsi,%rsi,1)
13: 89 f8 mov %edi,%eax
15: 48 c1 e8 03 shr $0x3,%rax
19: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
1d: 74 08 je 0x27
1f: 4c 89 ff mov %r15,%rdi
22: e8 28 6d b9 00 call 0xb96d4f
27: 49 8b 1f mov (%r15),%rbx
* 2a: 48 89 de mov %rbx,%rsi <-- trapping instruction
2d: 48 83 e6 02 and $0x2,%rsi
31: 31 ff xor %edi,%edi
33: e8 67 21 54 00 call 0x54219f
38: 48 89 d8 mov %rbx,%rax
3b: 48 83 e0 02 and $0x2,%rax
3f: 75 .byte 0x75