==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888131b76390 by task syz.2.157/886

CPU: 0 PID: 886 Comm: syz.2.157 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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_88b6ce719581ac33+0x21/0x31
 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+0x3d5/0xa00 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:perf_event_ctx_unlock kernel/events/core.c:1321 [inline]
RIP: 0010:perf_ioctl+0x13fa/0x1e70 kernel/events/core.c:5838
Code: f7 ff ff ff eb 1f e8 e5 6a d7 ff e8 f0 e6 c3 ff 49 c7 c7 ea ff ff ff eb 08 e8 d2 6a d7 ff 45 31 ff 4c 8b 34 24 48 8b 5c 24 78 <48> 89 df 48 83 c7 10 e8 7a 18 65 03 48 89 df e8 92 c2 fc ff 48 c7
RSP: 0018:ffffc9000df8fbe0 EFLAGS: 00000246
RAX: ffffffff819a01cf RBX: ffff888132d0f800 RCX: 0000000000080000
RDX: ffffc900016ba000 RSI: 000000000000002b RDI: 000000000000002c
RBP: ffffc9000df8fe80 R08: ffff8881121fb6bf R09: 1ffff1102243f6d7
R10: dffffc0000000000 R11: ffffed102243f6d8 R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52001bf1f8c R15: 0000000000000000
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 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: 0033:0x7fbde5b9af79
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:00007fbde697a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbde5e15fa0 RCX: 00007fbde5b9af79
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007fbde5c316e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbde5e16038 R14: 00007fbde5e15fa0 R15: 00007fff7f11dd48
 </TASK>

Allocated by task 886:
 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+0xb2/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0x4b/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

The buggy address belongs to the object at ffff888131b76380
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888131b76380, ffff888131b763c0)

The buggy address belongs to the physical page:
page:ffffea0004c6dd80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131b76
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100042780
raw: 0000000000000000 0000000080200020 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2, tgid 2 (kthreadd), ts 21657161343, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554
 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2020
 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node+0xa1/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 __vmalloc_area_node mm/vmalloc.c:3070 [inline]
 __vmalloc_node_range+0x55f/0x1430 mm/vmalloc.c:3256
 alloc_thread_stack_node kernel/fork.c:320 [inline]
 dup_task_struct+0x3ae/0x790 kernel/fork.c:1082
 copy_process+0x5d6/0x3510 kernel/fork.c:2303
 kernel_clone+0x22f/0x820 kernel/fork.c:2890
 kernel_thread+0x103/0x160 kernel/fork.c:2952
 create_kthread kernel/kthread.c:409 [inline]
 kthreadd+0x337/0x460 kernel/kthread.c:760
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888131b76280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888131b76300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888131b76380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888131b76400: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc
 ffff888131b76480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	ff                   	ljmp   (bad)
   1:	eb 1f                	jmp    0x22
   3:	e8 e5 6a d7 ff       	call   0xffd76aed
   8:	e8 f0 e6 c3 ff       	call   0xffc3e6fd
   d:	49 c7 c7 ea ff ff ff 	mov    $0xffffffffffffffea,%r15
  14:	eb 08                	jmp    0x1e
  16:	e8 d2 6a d7 ff       	call   0xffd76aed
  1b:	45 31 ff             	xor    %r15d,%r15d
  1e:	4c 8b 34 24          	mov    (%rsp),%r14
  22:	48 8b 5c 24 78       	mov    0x78(%rsp),%rbx
* 27:	48 89 df             	mov    %rbx,%rdi <-- trapping instruction
  2a:	48 83 c7 10          	add    $0x10,%rdi
  2e:	e8 7a 18 65 03       	call   0x36518ad
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 92 c2 fc ff       	call   0xfffcc2cd
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7