==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 200 at addr ffffc9000e1b3c28 by task syz.0.13/366

CPU: 1 PID: 366 Comm: syz.0.13 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_a448e89f4c9ad9d1+0x28/0x42
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x55/0x80 kernel/locking/spinlock.c:194
Code: 00 d5 0d 87 e8 9c b3 b5 fc 4c 89 f7 48 83 3d 21 dd 0c 02 00 74 30 e8 9e 0d 00 00 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 86 ae 4b fc 65 8b 05 c7 75 01 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc9000dd36988 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000246 RCX: dffffc0000000000
RDX: ffff88811410e9c0 RSI: 0000000000000246 RDI: 0000000000000001
RBP: ffffc9000dd36998 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001ba6d24 R12: ffff88811410e541
R13: ffffffff871b40c8 R14: 1ffffffff0e36800 R15: ffffffff871b40c0
 rcu_preempt_deferred_qs_irqrestore+0x6c9/0x9d0 kernel/rcu/tree_plugin.h:-1
 rcu_read_unlock_special+0xb2/0x440 kernel/rcu/tree_plugin.h:684
 __rcu_read_unlock+0x5e/0xa0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:832 [inline]
 is_bpf_text_address+0x177/0x190 kernel/bpf/core.c:724
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_frame.c:19
 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958
 __do_krealloc mm/slab_common.c:1341 [inline]
 krealloc+0x6f/0x110 mm/slab_common.c:1374
 push_jmp_history kernel/bpf/verifier.c:2462 [inline]
 is_state_visited kernel/bpf/verifier.c:12311 [inline]
 do_check+0x2d42/0xf070 kernel/bpf/verifier.c:12451
 do_check_common+0x11ae/0x1950 kernel/bpf/verifier.c:14930
 do_check_main kernel/bpf/verifier.c:14993 [inline]
 bpf_check+0x3f98/0x10d10 kernel/bpf/verifier.c:15570
 bpf_prog_load+0x10f0/0x16a0 kernel/bpf/syscall.c:2624
 __sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5005
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f109719c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1097fc5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1097415fa0 RCX: 00007f109719c799
RDX: 0000000000000090 RSI: 0000200000000840 RDI: 0000000000000005
RBP: 00007f1097232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1097416038 R14: 00007f1097415fa0 R15: 00007ffdb8b512f8
 </TASK>

The buggy address belongs to a 25-page vmalloc region starting at 0xffffc9000e19b000 allocated at prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
The buggy address belongs to the physical page:
page:ffffea0004cad380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132b4e
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x506dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_ZERO|__GFP_ACCOUNT), pid 366, tgid 365 (syz.0.13), ts 28121038850, free_ts 28011510218
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924
 vm_area_alloc_pages mm/vmalloc.c:-1 [inline]
 __vmalloc_area_node mm/vmalloc.c:3084 [inline]
 __vmalloc_node_range+0x8bf/0x1430 mm/vmalloc.c:3256
 __bpf_map_area_alloc kernel/bpf/syscall.c:334 [inline]
 bpf_map_area_alloc+0xd7/0xe0 kernel/bpf/syscall.c:341
 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126
 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1578 [inline]
 free_pcp_prepare mm/page_alloc.c:1652 [inline]
 free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618
 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3769
 release_pages+0xaf2/0xb50 mm/swap.c:1048
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:315
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu mm/mmu_gather.c:261 [inline]
 tlb_finish_mmu+0x1aa/0x370 mm/mmu_gather.c:361
 exit_mmap+0x412/0xc10 mm/mmap.c:3384
 __mmput+0x93/0x360 kernel/fork.c:1312
 mmput+0x4b/0x150 kernel/fork.c:1336
 exit_mm kernel/exit.c:568 [inline]
 do_exit+0x994/0x2660 kernel/exit.c:873
 do_group_exit+0x210/0x2d0 kernel/exit.c:1028
 get_signal+0x13b5/0x1520 kernel/signal.c:2891
 arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316
 irqentry_exit+0x12/0x40 kernel/entry/common.c:419

Memory state around the buggy address:
 ffffc9000e1b3b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000e1b3b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000e1b3c00: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8
                                           ^
 ffffc9000e1b3c80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000e1b3d00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
sched: RT throttling activated
----------------
Code disassembly (best guess):
   0:	00 d5                	add    %dl,%ch
   2:	0d 87 e8 9c b3       	or     $0xb39ce887,%eax
   7:	b5 fc                	mov    $0xfc,%ch
   9:	4c 89 f7             	mov    %r14,%rdi
   c:	48 83 3d 21 dd 0c 02 	cmpq   $0x0,0x20cdd21(%rip)        # 0x20cdd35
  13:	00
  14:	74 30                	je     0x46
  16:	e8 9e 0d 00 00       	call   0xdb9
  1b:	90                   	nop
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 86 ae 4b fc       	call   0xfc4baeb5 <-- trapping instruction
  2f:	65 8b 05 c7 75 01 7b 	mov    %gs:0x7b0175c7(%rip),%eax        # 0x7b0175fd
  36:	85 c0                	test   %eax,%eax
  38:	74 05                	je     0x3f
  3a:	5b                   	pop    %rbx
  3b:	41 5e                	pop    %r14
  3d:	5d                   	pop    %rbp
  3e:	c3                   	ret
  3f:	e8                   	.byte 0xe8