------------[ cut here ]------------
WARNING: CPU: 0 PID: 7005 at kernel/rcu/tree_stall.h:970 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:962
Modules linked in:
CPU: 0 PID: 7005 Comm: syz.1.639 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:970
Code: ff ff ff 48 c7 c7 20 ef c3 96 be 04 00 00 00 e8 3a 53 66 00 48 89 df b8 01 00 00 00 87 05 4c e3 56 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 2b b3 8c 74 47 48 c7 c0 e4 f7 1f 8e 48 c1 e8 03
RSP: 0018:ffffc90000007b78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cb32b80 RCX: ffffffff816d0bc6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cb32b80
RBP: ffffc90000007df0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2d87de4 R12: 0000000000002904
R13: dffffc0000000000 R14: 0000000000000a06 R15: dffffc0000000000
FS:  00007fd198eb56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd197f840c0 CR3: 0000000040368000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x60b/0x1740 kernel/rcu/tree.c:2552
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:signal_delivered kernel/signal.c:2910 [inline]
RIP: 0010:signal_setup_done+0x36e/0x490 kernel/signal.c:2919
Code: f6 e8 a6 47 81 00 49 bc 00 00 00 00 00 fc ff df 43 0f b6 44 25 00 84 c0 0f 85 0f 01 00 00 41 c7 07 02 00 00 00 4c 8b 6c 24 10 <31> ff 44 89 f6 e8 38 5e 30 00 45 85 f6 74 13 e8 ce 5a 30 00 bf 05
RSP: 0018:ffffc90003717b40 EFLAGS: 00000246
RAX: ffffffff81521741 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000c9e9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90003717c90 R08: ffff8880426b65c3 R09: 1ffff110084d6cb8
R10: dffffc0000000000 R11: ffffed10084d6cb9 R12: dffffc0000000000
R13: 1ffff920006e2f6c R14: 0000000000000000 R15: ffff88802a870960
 handle_signal arch/x86/kernel/signal.c:846 [inline]
 arch_do_signal_or_restart+0xf83/0x1350 arch/x86/kernel/signal.c:873
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd197fba450
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 02 1f 09 00 e8 e5 65 f9 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fd198eb4a78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fd198215fa0 RCX: 00007fd197f9aeb9
RDX: 00007fd198eb4a80 RSI: 00007fd198eb4bb0 RDI: 0000000000000021
RBP: 00007fd198008c1f R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd198216038 R14: 00007fd198215fa0 R15: 00007fffc3080928
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 a6 47 81 00       	call   0x8147ab
   5:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
   c:	fc ff df
   f:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
  15:	84 c0                	test   %al,%al
  17:	0f 85 0f 01 00 00    	jne    0x12c
  1d:	41 c7 07 02 00 00 00 	movl   $0x2,(%r15)
  24:	4c 8b 6c 24 10       	mov    0x10(%rsp),%r13
* 29:	31 ff                	xor    %edi,%edi <-- trapping instruction
  2b:	44 89 f6             	mov    %r14d,%esi
  2e:	e8 38 5e 30 00       	call   0x305e6b
  33:	45 85 f6             	test   %r14d,%r14d
  36:	74 13                	je     0x4b
  38:	e8 ce 5a 30 00       	call   0x305b0b
  3d:	bf                   	.byte 0xbf
  3e:	05                   	.byte 0x5