------------[ cut here ]------------
WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049, CPU#0: syz.4.2207/14276
Modules linked in:
CPU: 0 UID: 0 PID: 14276 Comm: syz.4.2207 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 52 c2 9a e8 b0 3a 85 00 b8 01 00 00 00 87 05 05 c5 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 e4 88 90 48 81 fd 00 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a38db0
RDX: fffffbfff3584a58 RSI: 0000000000000004 RDI: ffffffff9ac252c0
RBP: ffffffff8e3d4600 R08: 0000000000000001 R09: fffffbfff3584a58
R10: 0000000000000003 R11: ffff88802d342ff0 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4600 R15: ffff8880b843bc52
FS:  00007fe824db96c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c835156c0 CR3: 00000000293a4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1012 [inline]
 rcu_core+0x4cf/0x15f0 kernel/rcu/tree.c:2852
 handle_softirqs+0x219/0x950 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x41/0x70 kernel/kcov.c:217
Code: a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 8b 82 6c 16 00 00 85 c0 74 2b 8b 82 48 16 00 00 <83> f8 02 75 20 48 8b 8a 50 16 00 00 8b 92 4c 16 00 00 48 8b 01 48
RSP: 0018:ffffc90003d0fd40 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 00000000a596e008 RCX: ffffffff81b3771b
RDX: ffff88802d3424c0 RSI: ffffffff81b377ef RDI: 0000000000000007
RBP: ffff88809d95a4a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88802d342ff0 R12: ffff888000000000
R13: 0000000003878000 R14: dffffc0000000000 R15: 0000000000000000
 kimage_dst_used kernel/kexec_core.c:633 [inline]
 kimage_alloc_page+0x43f/0x920 kernel/kexec_core.c:712
 kimage_load_normal_segment kernel/kexec_core.c:826 [inline]
 kimage_load_segment+0x78e/0xdd0 kernel/kexec_core.c:944
 do_kexec_load+0x69e/0x860 kernel/kexec.c:155
 __do_sys_kexec_load kernel/kexec.c:261 [inline]
 __se_sys_kexec_load kernel/kexec.c:242 [inline]
 __x64_sys_kexec_load+0x1bf/0x230 kernel/kexec.c:242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe823f8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe824db9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6
RAX: ffffffffffffffda RBX: 00007fe8241e6180 RCX: 00007fe823f8f749
RDX: 0000200000000180 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007fe824013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe8241e6218 R14: 00007fe8241e6180 R15: 00007ffc6024df58
 </TASK>
----------------
Code disassembly (best guess):
   0:	a9 00 01 ff 00       	test   $0xff0100,%eax
   5:	74 1d                	je     0x24
   7:	f6 c4 01             	test   $0x1,%ah
   a:	74 43                	je     0x4f
   c:	a9 00 00 0f 00       	test   $0xf0000,%eax
  11:	75 3c                	jne    0x4f
  13:	a9 00 00 f0 00       	test   $0xf00000,%eax
  18:	75 35                	jne    0x4f
  1a:	8b 82 6c 16 00 00    	mov    0x166c(%rdx),%eax
  20:	85 c0                	test   %eax,%eax
  22:	74 2b                	je     0x4f
  24:	8b 82 48 16 00 00    	mov    0x1648(%rdx),%eax
* 2a:	83 f8 02             	cmp    $0x2,%eax <-- trapping instruction
  2d:	75 20                	jne    0x4f
  2f:	48 8b 8a 50 16 00 00 	mov    0x1650(%rdx),%rcx
  36:	8b 92 4c 16 00 00    	mov    0x164c(%rdx),%edx
  3c:	48 8b 01             	mov    (%rcx),%rax
  3f:	48                   	rex.W