------------[ cut here ]------------
WARNING: CPU: 1 PID: 27037 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: 27037 Comm: syz.8.6561 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 80 c4 ee 96 be 04 00 00 00 e8 7a a8 6c 00 48 89 df b8 01 00 00 00 87 05 bc 98 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 40 54 d3 8c 74 47 48 c7 c0 dc bc 4a 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35440 RCX: ffffffff81702bb6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35440
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2ddd890 R12: 0000000000002904
R13: 1ffff110171e7a6a R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f6d259536c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558c60e4a8 CR3: 000000005e1dc000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 4b da e5 f6 e8 46 5f 16 f7 fb bf 01 00 00 00 <e8> db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000cfdebc0 EFLAGS: 00000282
RAX: abc6710f2a271100 RBX: 0000000000000000 RCX: abc6710f2a271100
RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001
RBP: ffffc9000cfdec60 R08: ffffffff8e4a882f R09: 1ffffffff1c95105
R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920019fbd78
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:stack_trace_consume_entry+0x0/0x270 kernel/stacktrace.c:83
Code: 00 00 00 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 78 75 09 48 8d 65 f0 5b 41 5e 5d c3 e8 99 e0 f8 08 66 0f 1f 84 00 00 00 00 00 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00
RSP: 0018:ffffc9000cfded20 EFLAGS: 00000286
RAX: ffffffff8132104a RBX: ffffc9000cfdede0 RCX: ffff88802c393c00
RDX: 0000000000000002 RSI: ffffffff8199c399 RDI: ffffc9000cfdede0
RBP: ffffc9000cfdedb0 R08: ffff88802c393c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000002 R12: ffffffff8199c399
R13: 0000000000000000 R14: ffffffff817466a0 R15: ffffc9000cfded28
 arch_stack_walk+0x138/0x190 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027
 __do_krealloc mm/slab_common.c:1402 [inline]
 krealloc+0x86/0x120 mm/slab_common.c:1435
 push_jmp_history kernel/bpf/verifier.c:3443 [inline]
 do_check+0x4b89/0xdbe0 kernel/bpf/verifier.c:17098
 do_check_common+0xadb/0x13e0 kernel/bpf/verifier.c:19699
 do_check_main kernel/bpf/verifier.c:19762 [inline]
 bpf_check+0x649f/0xe970 kernel/bpf/verifier.c:20430
 bpf_prog_load+0x11cb/0x16d0 kernel/bpf/syscall.c:2744
 __sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467
 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6d24b8ebe9
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:00007f6d25953038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6d24db5fa0 RCX: 00007f6d24b8ebe9
RDX: 000000000000004c RSI: 0000200000000900 RDI: 0000000000000005
RBP: 00007f6d24c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d24db6038 R14: 00007f6d24db5fa0 R15: 00007fff5a0800c8
 </TASK>
----------------
Code disassembly (best guess):
   0:	44 24 20             	rex.R and $0x20,%al
   3:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
   8:	74 0b                	je     0x15
   a:	0f 0b                	ud2
   c:	48 f7 03 08 00 00 00 	testq  $0x8,(%rbx)
  13:	74 63                	je     0x78
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 4b da e5 f6       	call   0xf6e5da6a
  1f:	e8 46 5f 16 f7       	call   0xf7165f6a
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 db b5 ff ff       	call   0xffffb60a <-- trapping instruction
  2f:	48 c7 44 24 40 00 00 	movq   $0x0,0x40(%rsp)
  36:	00 00
  38:	9c                   	pushf
  39:	8f 44 24 40          	pop    0x40(%rsp)
  3d:	8b                   	.byte 0x8b
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24