------------[ cut here ]------------
WARNING: CPU: 0 PID: 10548 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 0 PID: 10548 Comm: syz.3.1204 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 04 ef 96 be 04 00 00 00 e8 9a ba 6c 00 48 89 df b8 01 00 00 00 87 05 7c d9 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 51 d3 8c 74 47 48 c7 c0 1c ba 4a 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35180 RCX: ffffffff81702b16
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35180
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2dde094 R12: 0000000000002904
R13: 1ffff110171c7a22 R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f68f75646c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68f7542f98 CR3: 000000005cff2000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rcu_core+0x612/0x1720 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+0xc7/0x190 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:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:413
Code: 8a e8 de fc 1c 09 65 66 8b 05 86 25 b2 7e 66 85 c0 75 54 bf 01 00 00 00 e8 77 da 09 00 e8 72 5b 3a 00 fb 65 8b 05 52 25 b2 7e <85> c0 75 05 e8 71 09 af ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc900148f7860 EFLAGS: 00000286
RAX: 0000000080000000 RBX: 0000000000000200 RCX: 0cb9741f79971d00
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc64c0
RBP: ffffc900148f78f0 R08: ffffffff8e4a856f R09: 1ffffffff1c950ad
R10: dffffc0000000000 R11: fffffbfff1c950ae R12: ffffffff8131426b
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200291ef0c
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
 copy_fpstate_to_sigframe+0x49d/0xbe0 arch/x86/kernel/fpu/signal.c:233
 get_sigframe+0x5ce/0x7c0 arch/x86/kernel/signal.c:142
 x64_setup_rt_frame+0x158/0xcd0 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:223 [inline]
 handle_signal arch/x86/kernel/signal.c:267 [inline]
 arch_do_signal_or_restart+0x3e5/0x780 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f68f665ec7f
Code: ff ff 01 64 48 8b 04 25 00 00 00 00 48 8d b8 c8 fe ff ff e8 a3 c1 0c 00 85 c0 0f 84 93 01 00 00 64 f0 83 2c 25 90 ff ff ff 01 <e8> ec 9b 0b 00 48 8b 0c 24 8b 00 48 83 b9 88 00 00 00 ff 89 81 90
RSP: 002b:00007f68f7564060 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f68f69e5fa0 RCX: 00007f68f6811f91
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f68f6811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f68f69e6038 R14: 00007f68f69e5fa0 R15: 00007fff8857b098
 </TASK>
----------------
Code disassembly (best guess):
   0:	8a e8                	mov    %al,%ch
   2:	de fc                	fdivrp %st,%st(4)
   4:	1c 09                	sbb    $0x9,%al
   6:	65 66 8b 05 86 25 b2 	mov    %gs:0x7eb22586(%rip),%ax        # 0x7eb22594
   d:	7e
   e:	66 85 c0             	test   %ax,%ax
  11:	75 54                	jne    0x67
  13:	bf 01 00 00 00       	mov    $0x1,%edi
  18:	e8 77 da 09 00       	call   0x9da94
  1d:	e8 72 5b 3a 00       	call   0x3a5b94
  22:	fb                   	sti
  23:	65 8b 05 52 25 b2 7e 	mov    %gs:0x7eb22552(%rip),%eax        # 0x7eb2257c
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	75 05                	jne    0x33
  2e:	e8 71 09 af ff       	call   0xffaf09a4
  33:	48 c7 04 24 0e 36 e0 	movq   $0x45e0360e,(%rsp)
  3a:	45
  3b:	4b                   	rex.WXB
  3c:	c7                   	.byte 0xc7
  3d:	04 37                	add    $0x37,%al