------------[ cut here ]------------
WARNING: CPU: 0 PID: 6271 at kernel/rcu/tree_stall.h:989 rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:989
Modules linked in:
CPU: 0 UID: 0 PID: 6271 Comm: syz.1.117 Not tainted 6.14.0-syzkaller-g07be1f644ff9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:989
Code: c7 80 6f 76 9a be 04 00 00 00 e8 ac 1c 83 00 b8 01 00 00 00 87 05 01 1d cd 18 85 c0 0f 85 1a ff ff ff 48 c7 c0 40 01 d4 8e 90 <0f> 0b 90 49 39 c7 74 47 48 c7 c0 30 78 5f 90 48 c1 e8 03 42 0f b6
RSP: 0018:ffffc90000007b98 EFLAGS: 00010046
RAX: ffffffff8ed40140 RBX: 00000000ffffdab1 RCX: ffffffff81a95274
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9a766f80
RBP: ffffc90000007df0 R08: 0000000000000003 R09: fffffbfff34ecdf0
R10: dffffc0000000000 R11: fffffbfff34ecdf0 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8ed40140
FS:  00007f94da1776c0(0000) GS:ffff888124fb1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3090dff8 CR3: 000000002887e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x652/0x17a0 kernel/rcu/tree.c:2819
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
RIP: 0010:unwind_next_frame+0x6e5/0x22f0 arch/x86/kernel/unwind_orc.c:494
Code: 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 1c 46 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 48 63 03 48 01 d8 48 8d 4b 04 4c 39 f8 4c 0f 46 f1 48
RSP: 0018:ffffc9000caf6390 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffffff90778720 RCX: dffffc0000000000
RDX: 00000000000b319c RSI: ffffffff90f1cce2 RDI: ffffffff816e0b30
RBP: ffffffff90778724 R08: 0000000000000014 R09: ffffc9000caf6550
R10: ffffc9000caf64b0 R11: ffffffff81aee890 R12: ffffffff9077871c
R13: ffffffff907786f0 R14: ffffffff90778720 R15: ffffffff81d4cddb
 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2376 [inline]
 slab_free mm/slub.c:4633 [inline]
 kfree+0x198/0x430 mm/slub.c:4832
 krealloc_noprof+0x1ad/0x300 mm/slub.c:-1
 kvrealloc_noprof+0x62/0xe0 mm/slub.c:5097
 push_insn_history+0x16f/0x6b0 kernel/bpf/verifier.c:3874
 check_stack_read_fixed_off kernel/bpf/verifier.c:5424 [inline]
 check_stack_read+0x1e18/0x2b40 kernel/bpf/verifier.c:5522
 check_mem_access+0xc1a/0x2310 kernel/bpf/verifier.c:7569
 check_load_mem+0x509/0xc10 kernel/bpf/verifier.c:7685
 do_check+0x6e50/0xef50 kernel/bpf/verifier.c:19504
 do_check_common+0x16e4/0x20f0 kernel/bpf/verifier.c:22776
 do_check_main kernel/bpf/verifier.c:22867 [inline]
 bpf_check+0x16ad9/0x1d1c0 kernel/bpf/verifier.c:24033
 bpf_prog_load+0x17ee/0x2250 kernel/bpf/syscall.c:2971
 __sys_bpf+0x5dd/0x8b0 kernel/bpf/syscall.c:5834
 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5939 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94d938d169
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:00007f94da177038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f94d95a5fa0 RCX: 00007f94d938d169
RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007f94d940e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94d95a5fa0 R15: 00007ffe3a1c3d38
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 c1                	mov    %eax,%ecx
   2:	48 c1 f9 02          	sar    $0x2,%rcx
   6:	48 c1 e8 3f          	shr    $0x3f,%rax
   a:	48 01 c8             	add    %rcx,%rax
   d:	48 83 e0 fe          	and    $0xfffffffffffffffe,%rax
  11:	49 8d 1c 46          	lea    (%r14,%rax,2),%rbx
  15:	48 89 d8             	mov    %rbx,%rax
  18:	48 c1 e8 03          	shr    $0x3,%rax
  1c:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  23:	fc ff df
  26:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	75 27                	jne    0x55
  2e:	48 63 03             	movslq (%rbx),%rax
  31:	48 01 d8             	add    %rbx,%rax
  34:	48 8d 4b 04          	lea    0x4(%rbx),%rcx
  38:	4c 39 f8             	cmp    %r15,%rax
  3b:	4c 0f 46 f1          	cmovbe %rcx,%r14
  3f:	48                   	rex.W