------------[ cut here ]------------
WARNING: CPU: 0 PID: 20421 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 0 UID: 0 PID: 20421 Comm: syz.1.3300 Not tainted 6.16.0-syzkaller-11743-g6bcdbd62bd56 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1050
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 00 30 e5 9a e8 c0 be 80 00 b8 01 00 00 00 87 05 f5 fe 43 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 64 24 ab 90 48 81 fd 80 bf 5c 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a13100
RDX: fffffbfff35ca600 RSI: 0000000000000004 RDI: ffffffff9ae53000
RBP: ffffffff8e5cbf80 R08: 0000000000000001 R09: fffffbfff35ca600
R10: 0000000000000003 R11: 0000000000000000 R12: 1ffffffff1c42240
R13: 0000000000000246 R14: ffffffff8e5cbf80 R15: ffff8880b843b312
FS: 00007f976092c6c0(0000) GS:ffff8881246c6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000025d35000 CR4: 00000000003526f0
Call Trace:
rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1013 [inline]
rcu_core+0x4cf/0x1530 kernel/rcu/tree.c:2856
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xdfd/0x1600 kernel/smp.c:877
Code: 57 48 8b 54 24 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 05 05 0c 00 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 e0 05 00 00 8b 43 08 31
RSP: 0018:ffffc90003337658 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff8880b853fe80 RCX: ffffc90010571000
RDX: 0000000000080000 RSI: ffffffff81af8e1b RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffed10170a7fd1 R14: 0000000000000001 R15: 0000000000000001
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1044
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline]
smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2863
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x376/0x550 kernel/jump_label.c:919
static_key_slow_inc_cpuslocked kernel/jump_label.c:168 [inline]
static_key_slow_inc_cpuslocked+0x86/0x150 kernel/jump_label.c:151
static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191
kvm_create_lapic+0x2aa/0x4d0 arch/x86/kvm/lapic.c:2905
kvm_arch_vcpu_create+0x283/0xb20 arch/x86/kvm/x86.c:12251
kvm_vm_ioctl_create_vcpu virt/kvm/kvm_main.c:4197 [inline]
kvm_vm_ioctl+0xfec/0x4000 virt/kvm/kvm_main.c:5146
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f975fb8e76b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f976092bf00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f975fdb6080 RCX: 00007f975fb8e76b
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000007
RBP: 0000200000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000001000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000190 R14: 00002000000003c0 R15: 00007fffabc97fb8
----------------
Code disassembly (best guess):
0: 57 push %rdi
1: 48 8b 54 24 10 mov 0x10(%rsp),%rdx
6: 4c 89 74 24 10 mov %r14,0x10(%rsp)
b: 49 89 d5 mov %rdx,%r13
e: 48 89 d5 mov %rdx,%rbp
11: 48 89 54 24 18 mov %rdx,0x18(%rsp)
16: 49 c1 ed 03 shr $0x3,%r13
1a: 83 e5 07 and $0x7,%ebp
1d: 4d 01 e5 add %r12,%r13
20: 83 c5 03 add $0x3,%ebp
23: e8 05 05 0c 00 call 0xc052d
28: f3 90 pause
* 2a: 41 0f b6 45 00 movzbl 0x0(%r13),%eax <-- trapping instruction
2f: 40 38 c5 cmp %al,%bpl
32: 7c 08 jl 0x3c
34: 84 c0 test %al,%al
36: 0f 85 e0 05 00 00 jne 0x61c
3c: 8b 43 08 mov 0x8(%rbx),%eax
3f: 31 .byte 0x31