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WARNING: CPU: 1 PID: 6427 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 1 PID: 6427 Comm: vhost-6425 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 e4 30 97 be 04 00 00 00 e8 6a de 6d 00 48 89 df b8 01 00 00 00 87 05 7c 67 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 00 73 13 8d 74 47 48 c7 c0 ac 49 8b 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d137300 RCX: ffffffff81717d16
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d137300
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e61c94 R12: 0000000000002904
R13: ffffffff8d137300 R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f499a7c36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000001f7e8000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 rcu_core+0x635/0x1770 kernel/rcu/tree.c:2462
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:spin_unlock_bh include/linux/spinlock.h:-1 [inline]
RIP: 0010:virtio_vsock_skb_dequeue include/linux/virtio_vsock.h:96 [inline]
RIP: 0010:vhost_transport_do_send_pkt+0xf32/0x1250 drivers/vhost/vsock.c:120
Code: 48 3b 84 24 80 01 00 00 0f 85 92 02 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 76 8d 7c f9 4c 89 f7 e8 8e 70 85 02 <49> 89 de 48 89 df 48 8b 34 24 e8 3f 05 02 00 e9 ef fe ff ff e8 55
RSP: 0018:ffffc9000fe57ba0 EFLAGS: 00000246
RAX: 1c18c0a98fb65200 RBX: ffff88805c940000 RCX: 1c18c0a98fb65200
RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: ffffffff8b1c8e60
RBP: ffffc9000fe57d78 R08: ffffffff911c55ff R09: 1ffffffff2238abf
R10: dffffc0000000000 R11: fffffbfff2238ac0 R12: ffff88805c949638
R13: dffffc0000000000 R14: ffff88805c949650 R15: ffff88805c949650
 vhost_run_work_list+0x13d/0x1b0 drivers/vhost/vhost.c:419
 vhost_task_fn+0x2df/0x460 kernel/vhost_task.c:49
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 3b 84 24 80 01 00 	cmp    0x180(%rsp),%rax
   7:	00
   8:	0f 85 92 02 00 00    	jne    0x2a0
   e:	48 8d 65 d8          	lea    -0x28(%rbp),%rsp
  12:	5b                   	pop    %rbx
  13:	41 5c                	pop    %r12
  15:	41 5d                	pop    %r13
  17:	41 5e                	pop    %r14
  19:	41 5f                	pop    %r15
  1b:	5d                   	pop    %rbp
  1c:	c3                   	ret
  1d:	e8 76 8d 7c f9       	call   0xf97c8d98
  22:	4c 89 f7             	mov    %r14,%rdi
  25:	e8 8e 70 85 02       	call   0x28570b8
* 2a:	49 89 de             	mov    %rbx,%r14 <-- trapping instruction
  2d:	48 89 df             	mov    %rbx,%rdi
  30:	48 8b 34 24          	mov    (%rsp),%rsi
  34:	e8 3f 05 02 00       	call   0x20578
  39:	e9 ef fe ff ff       	jmp    0xffffff2d
  3e:	e8                   	.byte 0xe8
  3f:	55                   	push   %rbp